WO2017159696A1 - 蛍光部材および発光モジュール - Google Patents
蛍光部材および発光モジュール Download PDFInfo
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- WO2017159696A1 WO2017159696A1 PCT/JP2017/010261 JP2017010261W WO2017159696A1 WO 2017159696 A1 WO2017159696 A1 WO 2017159696A1 JP 2017010261 W JP2017010261 W JP 2017010261W WO 2017159696 A1 WO2017159696 A1 WO 2017159696A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
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- C01F1/00—Methods of preparing compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or the rare earths, in general
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- C01F17/00—Compounds of rare earth metals
- C01F17/30—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6
- C01F17/32—Compounds containing rare earth metals and at least one element other than a rare earth metal, oxygen or hydrogen, e.g. La4S3Br6 oxide or hydroxide being the only anion, e.g. NaCeO2 or MgxCayEuO
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- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
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- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
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- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
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- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0003—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being doped with fluorescent agents
Definitions
- the present invention relates to a fluorescent member and a light emitting module.
- a light emitting element that emits ultraviolet light or short wavelength visible light
- a mold member that seals the light emitting element
- a visible light of blue, yellow, or the like that is excited by ultraviolet light or short wavelength visible light emitted from the light emitting element.
- a light emitting module comprising a phosphor, and a mold member of the light emitting module includes at least a phosphor mixed therein and a layer that highly diffuses light from the phosphor, and a light that is lighter than a high diffusion layer. And a low diffusion layer having a low diffusion degree (see Patent Document 4).
- a light emitting element such as an LED (Light Emitting Diode) or LD (Laser Diode) is combined with a phosphor that is excited by light emitted from the light emitting element and emits wavelength-converted light.
- a vehicular lamp that can obtain a desired emission color has been devised (Patent Document 5).
- Fluorescent materials are difficult to avoid heat generation due to Stokes loss.
- the amount of heat generation increases, and some heat dissipation measures are required.
- the light emitting member including the phosphor is accommodated in a part of the support member made of a material such as aluminum, and the heat generated by the phosphor dissipates to the outside through the support member. Is done.
- JP 2014-067961 A JP 2012-062459 A Japanese Patent Laying-Open No. 2015-081313 JP 2013-38353 A International Publication No. 14/125782 Pamphlet
- the light emitting member in which the phosphor particles are dispersed in the resin does not have directivity and emits light evenly in all directions, a part of the light emitting surface is covered if there is a heat dissipation member around. As a result, the light use efficiency decreases. Further, when the temperature of the phosphor rises, the phonon vibration inside the phosphor is increased. As a result, the excitation energy absorbed in the phosphor does not change to light emission and is relaxed by phonon vibration, resulting in a decrease in light emission efficiency.
- the present invention has been made in view of such a situation, and one of the exemplary purposes thereof is to provide a fluorescent member that emits light having high directivity. Another exemplary object is to provide a technique for suppressing a decrease in light emission efficiency of the light emitting module.
- a fluorescent member has a wavelength having an incident part where light from a light source is incident and an emitting part which is excited by the incident light and emits converted light after wavelength conversion.
- a conversion unit, and a reflection unit provided on at least a part of the surface of the wavelength conversion unit.
- the wavelength conversion unit is made of a material that has a smaller degree of scattering when the light from the light source incident from the incident unit travels toward the emission unit than the polycrystalline material.
- the wavelength conversion unit is made of a material whose degree of scattering when the light from the light source incident from the incident unit travels toward the emission unit is smaller than that of a polycrystalline material.
- the ratio of the light traveling from the emitting part to the emitting part increases, and the directivity of the light emitted from the emitting part increases. Further, light that has leaked to the outside from a part of the surface until then is internally reflected by the reflecting portion and emitted from the emitting portion, so that the light utilization efficiency can be improved.
- the wavelength conversion part is a rod-shaped member, and an incident part and an emission part may be formed at both ends in the longitudinal direction of the member. As a result, the directions of light incident from the incident portion are aligned while passing through the rod-shaped member, and the directivity of the light emitted from the emission portion is increased.
- the wavelength converter may have an aspect ratio of 10 to 100.
- the wavelength conversion unit is a polygonal column or a cylinder, and a reflection unit may be provided on a side surface different from the incidence unit and the emission unit. As a result, light that has leaked from the side surface to the outside until then is internally reflected from the side surface, and the light utilization efficiency can be improved.
- the wavelength conversion part is made of a single crystal material or a ceramic material, and an angle formed between a main axis of the single crystal material or the ceramic material and a straight line connecting the incident part and the emission part may be within ⁇ 5 °. Thereby, the directivity of the light emitted from the emission part can be further enhanced.
- This light emitting module includes a light source, a wavelength conversion unit including an incident unit on which light from the light source is incident, and an emission unit that is excited by the incident light and emits converted light that has undergone wavelength conversion.
- the wavelength conversion unit is made of a material that has a small degree of scattering when the light from the light source incident from the incident unit travels toward the output unit as compared with the case of the polycrystalline material.
- the wavelength conversion unit is made of a material whose degree of scattering when the light from the light source incident from the incident unit travels toward the emission unit is smaller than that of a polycrystalline material.
- the ratio of the light traveling from the emitting part to the emitting part increases, and the directivity of the light emitted from the emitting part increases.
- the wavelength conversion part is a rod-shaped member, and an incident part and an emission part may be formed at both ends in the longitudinal direction of the member. As a result, the directions of light incident from the incident portion are aligned while passing through the rod-shaped member, and the directivity of the light emitted from the emission portion is increased.
- the wavelength converter may have an aspect ratio of 10 to 100.
- a reflection part provided on at least a part of the surface of the wavelength conversion part may be further provided.
- the wavelength conversion unit is a polygonal column or a cylinder, and a reflection unit may be provided on a side surface different from the incidence unit and the emission unit. Thereby, the utilization efficiency of light can further be improved.
- the wavelength converter is made of a single crystal material or a ceramic material, and the angle formed between the main axis of the single crystal material or the ceramic material and the optical axis of the light source may be within ⁇ 5 °. Thereby, the directivity of the light emitted from the emission part can be further enhanced.
- Still another embodiment of the present invention is also a light emitting module.
- the light emitting module includes a light source, an incident portion where light from the light source is incident, an emission portion which is excited by the incident light and emits converted light having a wavelength converted, and a side surface different from the incident portion and the emission portion. And a heat radiating unit provided to cover at least a part of the side surface.
- the wavelength conversion unit is configured to have directivity with respect to the light of the light source incident from the incident unit.
- the ratio of light emitted from the side surface of the wavelength conversion unit is reduced, the amount of light shielded by the heat dissipation unit is also reduced, and the ratio of light contributing to the light distribution of the light emitting module is increased.
- the heat dissipation part may be made of a material having a thermal conductivity of 50 [W / (m ⁇ K)] or more. Thereby, the thermal radiation performance of a thermal radiation part improves.
- a reflection part provided between the side surface and the heat dissipation part may be further provided.
- the reflection unit is configured to internally reflect the light of the light source incident on the wavelength conversion unit, and a material having a visible light reflectance of 80% or more may be used. Thereby, the light leaking to the outside from a part of the side faces is internally reflected by the reflecting portion and emitted from the emitting portion, so that the light use efficiency can be improved.
- the wavelength conversion unit is such that the degree of scattering of light from the light source incident from the incident part when traveling toward the emission part is smaller than the degree of scattering of light from the light source incident from the incident part toward the side surface. It may be configured.
- the wavelength conversion part is a rod-shaped member, and an incident part and an emission part may be formed at both ends in the longitudinal direction of the member. As a result, the directions of light incident from the incident portion are aligned while passing through the rod-shaped member, and the directivity of the light emitted from the emission portion is increased.
- the wavelength converter may have an aspect ratio of 10 to 100.
- the wavelength conversion unit may be a polygonal column or a cylinder.
- the wavelength conversion part is made of a single crystal material or a ceramic material, and an angle formed between a main axis of the single crystal material or the ceramic material and a straight line connecting the incident part and the emission part may be within ⁇ 5 °. Thereby, the directivity of the light emitted from the emission part can be further enhanced.
- the fluorescent member includes a first incident portion where light from a light source is incident, and a first emission from which converted light of a first color which is excited by the incident light and wavelength-converted is emitted.
- the first wavelength conversion unit is made of a material whose degree of scattering when the light of the light source incident from the first incident unit travels toward the first emission unit is smaller than that of a polycrystalline material.
- the second wavelength conversion unit is made of a material whose degree of scattering when the light from the light source incident from the second incident unit travels toward the second emission unit is smaller than that of a polycrystalline material.
- the first wavelength conversion unit is a material whose degree of scattering when the light of the light source incident from the first incident unit travels toward the first output unit is smaller than that of a polycrystalline material. Therefore, the ratio of the light traveling from the first incident part to the first emission part is increased, and the directivity of the converted light of the first color emitted from the first emission part is increased.
- the second wavelength conversion unit is made of a material whose degree of scattering when the light from the light source incident from the second incident unit travels toward the second emission unit is smaller than that of a polycrystalline material. Therefore, the ratio of the light traveling from the second incident part to the second emission part increases, and the directivity of the converted light of the second color emitted from the second emission part becomes strong. Then, by mixing the converted light of the first color and the converted light of the second color different from the first color, it is possible to emit various colors that are highly directional and cannot be realized by a single color.
- the first wavelength conversion part is a rod-shaped member, a first incident part is formed at one end in the longitudinal direction of the member, and a first emission part is formed at the other end in the longitudinal direction of the member.
- the second wavelength converting portion is a rod-shaped member, a second incident portion is formed at one end in the longitudinal direction of the member, and a second incident portion is formed at the other end in the longitudinal direction of the member.
- An emission part may be formed.
- the first wavelength conversion unit may be a cylindrical member, and the second wavelength conversion unit may be provided inside the hole of the first wavelength conversion unit.
- the first wavelength conversion unit may have an aspect ratio of 10 or more
- the second wavelength conversion unit may have an aspect ratio of 10 or more.
- the first wavelength conversion unit is a columnar member
- the second wavelength conversion unit is a columnar member
- the first wavelength conversion unit and the second wavelength conversion unit include the first emission unit and the second wavelength conversion unit. You may arrange
- the first wavelength conversion unit is made of a single crystal material or a ceramic material, and an angle formed between a main axis of the single crystal material or the ceramic material and a straight line connecting the first incident unit and the first emission unit is ⁇ It may be within 5 °. Thereby, the directivity of the light emitted from the first emission part can be further enhanced.
- the second wavelength conversion unit is made of a single crystal material or a ceramic material, and an angle formed between a main axis of the single crystal material or the ceramic material and a straight line connecting the second incident unit and the second emission unit is ⁇ It may be within 5 °. Thereby, the directivity of the light emitted from the second emission part can be further enhanced.
- Still another aspect of the present invention is a light emitting module.
- the light emitting module may include the above-described light source and a fluorescent member.
- the first incident portion and the second incident portion are adjacent to each other and may be arranged to face the light emitting surface of the light source.
- the present invention it is possible to provide a fluorescent member that emits light with strong directivity. Moreover, according to the other aspect of this invention, the fall of the light emission efficiency of a light emitting module can be suppressed.
- FIG. 1 is a schematic diagram of a light emitting module having a phosphor rod according to Example 1.
- FIG. It is the figure which showed the emission spectrum and excitation spectrum of the fluorescent substance 2. It is the figure which showed the emission spectrum and excitation spectrum of the fluorescent substance 3. It is the figure which showed the emission spectrum and excitation spectrum of nanocomposite fluorescent glass ceramics. It is the figure which showed the emission spectrum and excitation spectrum of translucent ceramics.
- 6 is a schematic diagram showing a light traveling state inside a phosphor rod according to Comparative Example 1.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 6.
- FIG. 10 is a figure which shows the emission spectrum of the chloroapatite single-crystal fluorescent substance which concerns on Example 6.
- FIG. 10 is a schematic diagram of a light emitting module having a fluorescent member according to Example 6.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 7.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 8.
- FIG. 10 is a figure which shows the emission spectrum of the chlorometasilicate single crystal fluorescent substance which concerns on Example 8.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 10.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 11.
- FIG. 14 is a schematic diagram of a fluorescent member according to Example 12.
- FIG. 14 is a schematic diagram of a fluorescent member according to Example 13.
- FIG. 10 is a schematic diagram of a fluorescent member according to Example 7.
- a general phosphor consists of a powdery polycrystal which is an assembly of very small single crystals (crystallites) of about several tens of nanometers, and the fluorescence from the phosphor is non-directional light emission.
- An interface called a crystal grain boundary exists between crystallites, and light scattering and shielding occur at the interface. Therefore, the light from the semiconductor light emitting element cannot be emitted without loss.
- the phosphor since the phosphor emits light due to electron transitions in the central element of the emission, the emitted light is Lambertian light with no directivity, so the light (utilization efficiency) taken into the optical system is reduced, and the system efficiency is reduced. descend.
- the wavelength conversion part is formed of a transparent matrix that does not obstruct the straightness of light.
- the polycrystalline phosphor has an interface called a crystal grain boundary between crystallites. Due to this interface, it is difficult to ensure straightness of light in the polycrystalline phosphor. Therefore, in order to ensure the linearity of light, the following materials are suitable for the wavelength conversion unit.
- the single crystal phosphor has a structure in which the entire crystal lattice and crystal axes are aligned.
- Such a single crystal phosphor can be obtained by vapor phase growth, phosphor melt growth, solution growth with a solvent (flux), or hydrothermal growth.
- the nanocomposite material is glass ceramic in which a fluorescent component having a size of 1 ⁇ 4 or less of the fluorescence emission wavelength ( ⁇ about 100 nm or less) is dispersed.
- Translucent ceramic phosphor The translucent ceramic phosphor is obtained by densely molding and sintering a raw material having primary particles of 500 nm or less. With only a transparent matrix, it is difficult to provide directivity to omnidirectional phosphor emission emitted by electron transition in atoms. Therefore, as stipulated later, a directional wavelength converter can be realized by devising the shape and surface properties.
- the phosphor is preferably in the form of a rod having a high aspect ratio with the side along the irradiation direction as the long side in order to impart directivity to light emission.
- a rod diameter (short side), rod length (long side), and aspect ratio (long side / short side) is demonstrated.
- the rod diameter is preferably 3 to 500 ⁇ m, more preferably 5 to 200 ⁇ m, in order to confine light emitted in the diffusion direction and guide it in the longitudinal direction of the rod.
- the rod diameter is 3 ⁇ m or less, the number of reflections that occur on the side surface of the rod tends to increase when light is guided in the longitudinal direction of the rod, so that light attenuation tends to occur.
- the rod diameter is 500 ⁇ m or more, the light confinement effect cannot be sufficiently obtained, and the light diffusion in the rod cannot be suppressed, so that a sufficiently strong directivity cannot be obtained.
- the length of the rod depends on the concentration of the activator of the phosphor, it is about 1 to 100 mm, and preferably 1 to 60 mm, from the viewpoint of enhancing directivity. More preferably, it is 1 to 10 mm, or 1 to 5 mm.
- the optical path length is short and sufficient directivity cannot be obtained. Further, the optical path length causing absorption and conversion of excitation light sufficient for wavelength conversion is insufficient.
- the thickness is 10 mm or more, particularly 100 mm or more, attenuation of light guided in the rod increases, and the rod is easily broken, resulting in a strength problem.
- the aspect ratio of the rod is preferably 10 to 100 in order to obtain strong directivity.
- the aspect ratio is 10 or less, light cannot be guided in the longitudinal direction of the rod, and desired directivity cannot be obtained.
- the aspect ratio is 100 or more, the light is attenuated in the rod and the light emission efficiency is lowered.
- the reflection film is composed of a total reflection film made of a dielectric, a metal reflection film that does not absorb visible light, or an increased reflection film made of a hybrid of a dielectric layer and a metal reflection layer.
- the rod incident surface is provided with a short pass filter that transmits the excitation light from the semiconductor light emitting element but does not transmit light having a wavelength longer than that of the excitation light.
- a transflective film having excitation light reflectance of 50% or more may be provided.
- the surface accuracy (for example, arithmetic average roughness Ra) of the incident surface is preferably 1 ⁇ 4 wavelength or less of fluorescence.
- the light exit surface of the rod may be provided with a transflective film that improves light confinement within the rod in order to enhance directivity.
- the surface accuracy (for example, arithmetic average roughness Ra) of the emission surface is preferably 1/8 wavelength or less of the peak wavelength of fluorescence.
- a form in which the interface refractive index is relaxed by a moth-eye structure (subwavelength grating) may be used.
- FIG. 1 is a schematic view of the light emitting module according to the first embodiment.
- the light emitting module 100 includes a light emitting element 10 as a light source and a wavelength conversion unit 12.
- the light emitting element 10 is preferably a semiconductor light emitting element such as an LED (Light emitting diode) element, an LD (Laser diode) element, or an EL (Electro Luminescence) element. Other elements may be used.
- the wavelength converting unit 12 includes an incident unit 12a on which light (excitation light) L1 emitted from the light emitting element 10 is incident, and an emitting unit 12b that is excited by the incident light L1 and emits wavelength-converted converted light L2.
- incident unit 12a on which light (excitation light) L1 emitted from the light emitting element 10 is incident
- emitting unit 12b that is excited by the incident light L1 and emits wavelength-converted converted light L2.
- the reflection unit 16 includes a reflection film 16a provided on the side surface 12c connecting the incident unit 12a and the emission unit 12b of the wavelength conversion unit 12, and a short circuit provided on the surface of the incident unit 12a. It has a pass filter 16b and a reflective film 16c provided on the surface of the emitting portion 12b.
- the short pass filter 16b is a filter that transmits most of light having a wavelength less than a predetermined wavelength, but does not transmit (reflects) most of light having a predetermined wavelength or more.
- the reflective film 16c is configured not to reflect the entire converted light L2 having undergone wavelength conversion, but to transmit at least a part thereof.
- the reflection part 16 does not need to be provided in all the incident part 12a, the output part 12b, and the side surface 12c, and if the combination and presence / absence of the reflection film 16a, the short pass filter 16b, and the reflection film 16c are appropriately selected.
- a configuration may be employed in which a reflective film is provided only on the side surface 12c and nothing is provided on the incident portion 12a or the emission portion 12b.
- the wavelength conversion unit 12 is made of a material that has a small degree of scattering when the light of the light emitting element incident from the incident unit 12a travels to the output unit compared to the case of a polycrystalline material. ing.
- the degree of scattering can be regarded as the ratio of light refracted and reflected from the light emitting element incident from the incident portion, and if the ratio is low, the degree of scattering is small.
- the degree of scattering is smaller when the light traveling direction changes by only 10 ° than when the light traveling direction changes by 30 ° during scattering.
- the wavelength conversion unit 12 is made of a material whose degree of scattering when the light L1 of the light emitting element incident from the incident unit 12a travels toward the output unit 12b is smaller than that of a polycrystalline material. Therefore, the ratio of light traveling from the incident portion 12a to the emitting portion 12b increases, and the directivity of light emitted from the emitting portion 12b increases. Further, light that has leaked to the outside from a part of the surface until then is internally reflected by the reflecting portion 16 and emitted from the emitting portion 12b, so that the light utilization efficiency can be improved.
- the wavelength conversion unit 12 is a rod-shaped member, and an incident portion 12a is formed at one end in the longitudinal direction of the member, and an output portion 12b is formed at the other end. As a result, the directions of light incident from the incident portion 12a are aligned while passing through the rod-shaped member, and the directivity of the light emitted from the emission portion 12b is increased. As described above, the wavelength conversion unit 12 is configured to have directivity with respect to the light of the light emitting element 10 incident from the incident unit 12a.
- the wavelength conversion unit 12 is a hexagonal column, and a reflective film 16c is provided on a side surface 12c different from the incident unit 12a and the emitting unit 12b.
- the wavelength converter 12 may be a polygonal column or a cylinder.
- an angle formed between the main axis of the single crystal material or the ceramic material and a straight line connecting the incident portion 12a and the emission portion 12b is within ⁇ 5 °. Good. More preferably, it is within ⁇ 3 °.
- the straight line connecting the incident part 12a and the emitting part 12b is, for example, a straight line intersecting the incident part 1 and the emitting part, and can be said to have the shortest length. Alternatively, it may be a normal line of at least one surface of the entrance portion and the exit portion and a straight line intersecting with the other surface.
- the main axis is a direction in which light is not separated even when light is incident in a birefringent crystal having optical anisotropy, and can also be called an optical axis.
- Uniaxial crystals belong to the hexagonal system and tetragonal system, and biaxial crystals belong to the orthorhombic system, monoclinic system, and triclinic system.
- An isotropic crystal such as a cubic crystal does not have a main axis. Thereby, the light parallel to the main axis can easily reach the emission part 12b, and the directivity of the light emitted from the emission part 12b can be further enhanced.
- Example 1 When a chloroapatite single crystal rod is used as a phosphor, a method for producing a single crystal rod made of an apatite phosphor will be described.
- CaCO 3 , CaHPO 4 .2H 2 O, Eu 2 O 3 , NH 4 Cl, and CaCl 2 are used as starting materials.
- the phosphor 1 is a single crystal of a hexagonal column having a composition of Ca 5 (PO 4 ) 3 Cl: Eu 2+ and having a diameter of 200 ⁇ m and a length of 10 mm and growing in the c-axis direction.
- FIG. 2 is a diagram showing an emission spectrum and an excitation spectrum of the phosphor 1.
- the phosphor 1 is a blue phosphor whose peak wavelength of the emission spectrum S1 is around 450 nm.
- the blue phosphor according to Example 1 is excited mainly by light in the ultraviolet region having a wavelength of 400 nm or less, and emits blue light.
- the obtained rod-shaped apatite crystal is cut with a slicer to a thickness (c-axis direction) of 6 mm, and the cut surface and side surfaces are polished to adjust the shape.
- a metal reflective film is provided on the side surface.
- an oxide dielectric thin film for example, Ta 2 O 5 (60 nm) / SiO 2 (30 nm)
- a silver (200 nm) film is formed thereon, and a protective SiO 2 (50 nm) film is further formed thereon.
- the incident surface is polished by precision polishing so that the arithmetic average roughness Ra is about 50 nm.
- oxide dielectric thin films having different refractive indexes are stacked in combination and formed.
- This multilayer film exhibits the optical performance of a short-pass filter, which has a transmittance of 96% or more at a wavelength of less than 420 nm, but a transmittance of less than 1% for a wavelength of 420 nm or more.
- the exit surface is polished by precision polishing so that the arithmetic average roughness Ra is about 30 nm. Thereafter, using an ion-assisted deposition apparatus, oxide dielectric thin films having different refractive indexes are stacked in combination and formed. This multilayer film exhibits a reflection performance with a reflectance of 90%.
- FIG. 3 is a schematic diagram of a light emitting module having a phosphor rod according to Example 1.
- the light emitting module 110 is configured by attaching the phosphor rod 18 described above to the end of an optical fiber 20 having a diameter of 200 ⁇ m (a cylindrical core diameter of 50 ⁇ m and a cylindrical cladding thickness of 75 ⁇ m covering the core) with a transparent silicone resin. ing.
- the other end (incident side) of the optical fiber 20 is provided with an InGaN-based laser diode 22 that emits light having a peak wavelength of 405 nm via a condensing / introducing spherical lens and rod lens.
- the light enters the optical fiber 20.
- Example 2 When a chlorometasilicate single crystal rod is used as a phosphor, a method for producing a single crystal rod made of chlorometasilicate will be described.
- SiO 2 , CaCO 3 , SrCl 2 .2H 2 O, Eu 2 O 3 , and NH 4 Cl are used in a molar ratio of SiO 2 : CaCO 3 : SrCl 2 .2H 2 O: Eu 2.
- O 3 : NH 4 Cl 1.0: 0.5: 0.8: 0.2: 10.0, and put each weighed raw material into an alumina mortar and pulverized and mixed to obtain a raw material mixture It was.
- the phosphor 2 is a spherical single crystal having a composition of (Ca, Sr, Eu) 7 (SiO 3 ) 6 Cl 2 and having a particle diameter of 4 mm.
- FIG. 4 is a diagram showing an emission spectrum and an excitation spectrum of the phosphor 2. As shown in FIG. 4, the phosphor 2 is a yellow phosphor whose peak wavelength of the emission spectrum S3 is around 580 nm. As shown in the excitation spectrum S4, the yellow phosphor according to Example 2 is excited mainly by light in the ultraviolet region having a wavelength of 400 nm or less or 410 nm or less, and emits yellow light.
- the obtained single crystal of chlorometasilicate is a monoclinic crystal, and this single crystal is cut by a slicer along the optical axis direction showing no birefringence while confirming by X-ray diffraction, and a square column having a thickness of 100 ⁇ m ⁇ . Grinded into a shape, polished the surface, cut again to a length of 3 mm with a slicer, and adjusted to a rod shape.
- a metal reflective film is provided on the side surface. Specifically, it is the same as in the first embodiment.
- the configuration of the incident surface is the same as that of the first embodiment.
- the exit surface is polished by precision polishing so that the arithmetic average roughness Ra is about 30 nm. Thereafter, using an ion-assisted deposition apparatus, oxide dielectric thin films having different refractive indexes are stacked in combination and formed. This multilayer film exhibits a reflection performance with a reflectance of 50%.
- Example 3 Nanocomposite fluorescence consisting of SiO 2 and (Ca, Eu) I 2 as a phosphor
- a method for producing a rod made of a nanocomposite phosphor in which nanofluorescent components are dispersed will be described.
- each weighed raw material was pulverized and mixed in an alumina mortar in a glove box in a dry nitrogen atmosphere to obtain a raw material mixture.
- the phosphor 3 is a nanocomposite phosphor in which a fluorescent single crystal (Ca, Eu) I 2 having a diameter of about 50 nm and dispersed in a SiO 2 fiber having a diameter of 200 ⁇ m and a length of 10 mm is dispersed.
- FIG. 5 is a diagram showing an emission spectrum and an excitation spectrum of the phosphor 3. As shown in FIG. 5, the phosphor 3 is a blue phosphor whose peak wavelength of the emission spectrum S5 is around 465 nm. As shown in the excitation spectrum S6, the blue phosphor according to Example 3 is excited mainly by light in the ultraviolet or blue light region having a wavelength in the range of 320 to 450 nm and emits blue light.
- the obtained nanocomposite phosphor rod is cut to 6 mm with a slicer, the cut surface is polished, and the shape is adjusted.
- a metal reflective film is provided on the side surface. Specifically, it is the same as in the first embodiment.
- the configuration of the incident surface is the same as that of the first embodiment.
- the exit surface was flat-polished, then a nanoimprint was used to form a mask, and dry etching was performed to produce a pyramidal uneven shape with a pitch of 100 nm and a height of 50 nm.
- Example 4 When a nanocomposite fluorescent glass ceramic rod in which rare earth Eu 3+ is dispersed in fluoride glass is used)
- a method for producing a rod made of nanocomposite fluorescent glass ceramic will be described.
- This raw material mixture is put into an alumina crucible, heated to 1300 ° C. at a heating rate of 100 ° C./h, fired (synthesized) in an electric furnace in a nitrogen atmosphere for 5 hours, and then naturally cooled to obtain molten glass. Obtained.
- FIG. 6 is a diagram showing an emission spectrum and an excitation spectrum of the nanocomposite fluorescent glass ceramic.
- the nanocomposite fluorescent glass ceramic is a red phosphor having a peak wavelength of the emission spectrum S7 of around 614 nm.
- the excitation spectrum S8 the red phosphor according to Example 4 is excited mainly by light in the ultraviolet region having a wavelength of less than 400 nm and emits red light.
- the obtained nanocomposite fluorescent glass ceramic is cut into 6 mm with a slicer, the cut surface is polished, and the shape is adjusted.
- a metal reflective film is provided on the side surface. Specifically, this is the same as in the third embodiment.
- the configurations of the entrance surface and the exit surface are the same as in the third embodiment.
- Example 5 Y 3 Al 5 O 12 : When using Ce light-transmitting ceramics
- An aqueous solution in which Y 2 O 3 and CeO 2 are dissolved in nitric acid and an aqueous solution in which Al 2 (NO 3 ) 3 is dissolved in a pure form are prepared.
- the concentration of this aqueous solution is adjusted, mixed to a stoichiometric ratio, and mixed with ammonium bicarbonate.
- the pH was adjusted to 7-9 and precipitated as a carbonate to obtain a mixed raw material powder.
- This mixed raw material powder was put in an alumina crucible and fired at 1200 ° C. for 3 hours to obtain a fine powder having a composition of Y 2.995 Al 5 O 12 : Ce 0.005 .
- a slurry of 3 to 15% by weight was prepared.
- a tablet was formed by casting. The molded tablet is dried and heated at 1500 ° C. for 10 hours for primary sintering, and the primary sintered product is subjected to hot isostatic pressing (HIP) at 2000 ° C. and 2000 atmospheres. Densification over time gave a translucent ceramic.
- HIP hot isostatic pressing
- FIG. 7 is a diagram showing an emission spectrum and an excitation spectrum of translucent ceramics.
- the translucent ceramic is a yellow phosphor having an emission spectrum S9 having a peak wavelength of around 540 nm.
- the excitation spectrum S10 the yellow phosphor according to Example 5 is excited mainly by light in a blue region having a wavelength in the range of 430 to 480 nm and emits yellow light.
- the obtained light-transmitting ceramic phosphor was sliced to a thickness of 200 ⁇ m with a slicer, the cut surface was polished, further cut to a width of 200 ⁇ m and a length of 3 mm, the cut surface was polished, and the shape was adjusted.
- a metal reflective film is provided on the side surface.
- an oxide dielectric thin film for example, Ta 2 O 5 (60 nm) / SiO 2 (30 nm)
- a silver (200 nm) film was formed thereon.
- the incident surface is polished by precision polishing so that the arithmetic average roughness Ra is about 50 nm.
- oxide dielectric thin films having different refractive indexes are stacked in combination and formed.
- This multilayer film exhibits the optical performance of a short-pass filter having a transmittance of 96% or more at a wavelength of less than 480 nm but a transmittance of less than 1% for a wavelength of 480 nm or more.
- the exit surface is polished by precision polishing so that the arithmetic average roughness Ra is about 30 nm. Thereafter, using an ion-assisted deposition apparatus, oxide dielectric thin films having different refractive indexes are stacked in combination and formed. This multilayer film exhibits a reflection performance with a reflectance of 95%.
- the light emitting module is configured by attaching the above-described phosphor rod to the tip of an optical fiber having a diameter of 200 ⁇ m (a cylindrical core diameter of 50 ⁇ m and a cylindrical cladding thickness of 75 ⁇ m covering the core) with a transparent silicone resin.
- the other end (incident side) of the optical fiber is provided with an InGaN-based laser diode that emits light having a peak wavelength of 455 nm via a condensing / introducing spherical lens and rod lens, and blue light is emitted. Incident into the fiber.
- the composite is a fine particle having a composition of (Ca, Sr, Eu) 7 (SiO 3 ) 6 Cl 2 and a particle diameter of 0.5 ⁇ m.
- the sintered body was cut with a slicer, ground to a square column shape with a thickness of 100 ⁇ m ⁇ , polished on the surface, cut again with a slicer to a length of 3 mm, and adjusted to a rod shape.
- the linear transmittance of this rod is as low as 8%.
- a metal reflective film is provided on the side surface. Specifically, it is the same as in the first embodiment.
- the configuration of the incident surface is the same as that of the first embodiment.
- the exit surface is polished by precision polishing so that the arithmetic average roughness Ra is about 30 nm. Thereafter, using an ion-assisted deposition apparatus, oxide dielectric thin films having different refractive indexes are stacked in combination and formed. This multilayer film exhibits a reflection performance with a reflectance of 50%.
- Comparative Example 2 When a chlorometasilicate single crystal having no rod structure is used as a phosphor, A chlorometasilicate single crystal according to Comparative Example 2 was obtained in the same manner as in Example 2. The obtained monoclinic chlorometasilicate single crystal was processed into a cubic shape having a side of 310 ⁇ m using a slicer, a grinding machine, and a polishing machine. This corresponds to approximately the same volume as the phosphor single crystal rod of Example 2.
- Example 2 The side surface, incident surface, and exit surface were subjected to the same surface treatment as in Example 2.
- the single crystal phosphor described above was installed at the tip of the optical fiber in the same manner as in Example 2 to constitute a light emitting module.
- Comparative Example 3 When no reflective film is applied to the rod surface
- the phosphor according to Comparative Example 3 is obtained by processing the same apatite phosphor single crystal rod as in Example 1 into the same shape as in Example 1.
- the phosphor rod according to the present embodiment is different from Example 1 in that no surface treatment is performed.
- the light emitting module of the structure similar to Example 1 was assembled using the said fluorescent substance.
- the phosphor according to each example has a solid angle of emitted light of less than 1.47 sr (half apex angle 40 °), and the emitted light emitted from the phosphor has strong directivity. I understand. On the other hand, the phosphor according to each comparative example has a solid angle of the emitted light of 11.10 sr (half apex angle 140 °) or more, and it can be seen that the emitted light emitted from the phosphor has almost no directivity.
- FIG. 8 is a schematic diagram showing a light traveling state inside the phosphor rod according to Comparative Example 1. Since the chlorometasilicate phosphor according to Comparative Example 1 is monoclinic, the refractive index varies depending on the crystal orientation. For this reason, in a polycrystalline sintered body in which the orientation of the crystallites 23 is not aligned, straightness is lost due to refractive index fluctuations at the crystal grain boundaries, and it is difficult to improve directivity.
- a single crystal that does not cause scattering due to grain boundaries has high excitation light permeability, and the absorption rate of excitation light is significantly reduced. Therefore, as in the light emitting module shown in this embodiment, by appropriately selecting the rod shape of the wavelength conversion unit and the configuration of the reflective film, not only the directivity of the emitted light is increased, but also the absorption rate of the excitation light is increased. You can also
- FIG. 9 is a schematic diagram showing wavelength-converted light inside the phosphor according to Comparative Example 2.
- the phosphor 24 is a cubic type (cubic) as in Comparative Example 2, the direction of wavelength-converted light is not aligned, the critical angle hitting the surface 24a of the phosphor 24 is increased, and a sufficient confinement effect is obtained in the phosphor. This results in a decrease in efficiency.
- FIG. 10 is a schematic diagram showing wavelength-converted light inside the phosphor according to Comparative Example 3. As shown in FIG. 10, since a part of the wavelength-converted light passes through the side surface 12c and travels outward, the utilization efficiency of the excitation light is significantly reduced.
- Table 2 shows the phosphor composition, phosphor shape, presence / absence of a reflective film, and absorption rate of excitation light in Example 1, Example 2, Comparative Example 2 and Comparative Example 3.
- FIG. 11 is a schematic diagram of a light emitting module according to the second embodiment.
- the light emitting module 111 includes a light emitting element 10 as a light source, a wavelength conversion unit 12 (see FIG. 1), an optical fiber 14, and a heat sink 15 as a heat radiating unit.
- the light emitting module 111 includes a columnar phosphor rod 18 as the wavelength conversion unit 12. Details of the material of the phosphor rod 18 will be described later.
- the phosphor rod 18 is attached to the tip of an optical fiber 14 having a diameter of 200 ⁇ m (a cylindrical core diameter of 50 ⁇ m and a cylindrical cladding thickness of 75 ⁇ m covering the core) with a transparent silicone resin.
- the light emitting element 10 is installed via a condensing / introducing spherical lens and a rod lens.
- emitted from the light emitting element 10 directly to the entrance part 12a of the fluorescent substance rod 18 via a collimating lens may be sufficient without using an optical fiber.
- an InGaN-based laser diode that emits light having a peak wavelength of 405 nm is used as one of wide band gap semiconductors, and purple light is incident on the optical fiber 14. Is done.
- the heat sink 15 is provided so as to cover at least a part of the wavelength conversion unit 12.
- the heat sink 15 according to the second embodiment is divided into two semi-cylindrical members 15a and 15b, and is made of a material having high thermal conductivity. Examples of the material having high thermal conductivity include carbon, copper, gold, silver, aluminum, magnesium, zinc, brass, silicon carbide (SiC), boron nitride (BN), and aluminum nitride (AlN).
- Each member 15 a, 15 b has an inner peripheral shape corresponding to the outer peripheral shape of the wavelength conversion unit 12, and is connected so as to sandwich the wavelength conversion unit 12 to constitute the heat sink 15.
- the heat sink 15 is preferably made of a material having a thermal conductivity of 50 [W / (m ⁇ K)] or more. Thereby, the heat dissipation performance of the heat sink 15 is improved.
- the wavelength conversion unit 12 is a material whose degree of scattering when the light L1 of the light emitting element incident from the incident unit 12a travels toward the output unit 12b is smaller than that of a polycrystalline material. It is configured.
- the wavelength conversion unit 12 scatters the light of the light emitting element 10 incident from the incident unit 12a when traveling toward the output unit 12b.
- the side surface 12c When the light of the light emitting element 10 incident from the incident unit 12a travels to the side surface 12c. It is comprised so that it may become small compared with the grade which is scattered. Therefore, the ratio of light traveling from the incident portion 12a to the emitting portion 12b is increased, and the directivity of light emitted from the emitting portion 12b is increased. Further, light that has leaked to the outside from a part of the surface until then is internally reflected by the reflecting portion 16 and emitted from the emitting portion 12b, so that the light utilization efficiency can be improved.
- the ratio of the light emitted from the side surface 12c of the wavelength conversion unit 12 is reduced, the amount of light shielded by the heat sink 15 is also reduced, and the ratio of the light contributing to the light distribution of the light emitting module 111 is increased.
- the reflective film 16a is provided between the side surface 12c and the heat sink 15, and is configured to internally reflect the light of the light emitting element 10 incident on the wavelength conversion unit 12.
- the reflective film 16a is made of a material having a visible light reflectance of 80% or more.
- the material having a high visible light reflectance may be a metal such as aluminum or silver, a dielectric laminated film having a different refractive index, or a metal and dielectric laminated film.
- FIG. 12 is a schematic diagram of a heat dissipation part according to a modification of the second embodiment.
- the heat radiation part 30 shown in FIG. 12 is a cylindrical member, and the phosphor rod 18 is accommodated in the internal space.
- a plurality of fins 30 a are formed on the outer periphery of the heat dissipating part 30 in the axial direction of the phosphor rod 18.
- the fluorescent substance rod 18 can be efficiently cooled by sending air from the direction shown by the arrow F along the longitudinal direction of the fin 30a.
- FIG. 13 is a schematic diagram of a heat dissipation unit according to another modification of the second embodiment.
- the heat radiation part 32 shown in FIG. 13 is a cylindrical member, and the phosphor rod 18 is accommodated in the internal space.
- On the outer peripheral portion of the heat radiating portion 32 an inlet 32a into which the refrigerant circulating inside the heat radiating portion 32 flows and an outlet 32b from which the refrigerant flows out are provided. Thereby, the phosphor rod 18 can be efficiently cooled.
- FIG. 14 is a schematic diagram of a fluorescent member according to the sixth embodiment.
- the fluorescent member 210 includes a cylindrical first wavelength conversion unit 112 and a cylindrical second wavelength conversion unit having an outer diameter smaller than the outer diameter of the first wavelength conversion unit 112. 114 and a columnar third wavelength conversion unit 116 having an outer diameter smaller than the outer diameter of the second wavelength conversion unit 114.
- the second wavelength conversion unit 114 is provided in the hole of the first wavelength conversion unit 112
- the third wavelength conversion unit 116 is provided in the hole of the second wavelength conversion unit 114. Is provided.
- the compact fluorescent member provided with multiple types of wavelength conversion parts is realizable.
- the first wavelength conversion unit 112 is an annular first incident unit 112a on which the light L1 of the light source is incident, and an annular first unit that is excited by the incident light and emits wavelength-converted first color converted light CL1. And a first emission part 112b.
- the second wavelength converting unit 114 is a second incident unit 114a on which the light L1 of the light source is incident, and a second emission in which the converted light CL2 of the second color which is excited by the incident light and wavelength-converted is emitted. Part 114b.
- the third wavelength conversion section 116 is a third incident section 116a on which the light L1 of the light source is incident, and a third emission in which the converted light CL3 of the second color which is excited by the incident light and wavelength-converted is emitted. Part 116b.
- the 1st incident part 112a, the 2nd incident part 114a, and the 3rd incident part 116a are mutually adjacent
- the first wavelength conversion unit 112 is made of a material whose degree of scattering when the light from the light source incident from the first incident unit 112a travels toward the first emission unit 112b is smaller than that of a polycrystalline material.
- the second wavelength conversion unit 114 is made of a material whose degree of scattering when the light from the light source incident from the second incident unit 114a travels toward the second emission unit 114b is smaller than that of a polycrystalline material.
- the third wavelength conversion unit 116 is made of a material whose degree of scattering when the light of the light source incident from the third incident unit 116a travels toward the third emission unit 116b is smaller than that of a polycrystalline material.
- the first wavelength conversion unit 112 has a degree of scattering when the light of the light source incident from the first incident unit 112a travels toward the first emission unit 112b as compared with the case of the polycrystalline material. Therefore, the ratio of the light traveling from the first incident portion 112a to the first emitting portion 112b increases, and the converted light CL1 of the first color emitted from the first emitting portion 112b is increased. Directivity becomes stronger.
- the second wavelength conversion unit 114 is a material whose degree of scattering when the light of the light source incident from the second incident unit 114a travels toward the second output unit 114b is smaller than that of a polycrystalline material.
- the ratio of the light traveling from the second incident portion 114a to the second emitting portion 114b is increased, and the directivity of the converted light CL2 of the second color emitted from the second emitting portion 114b is increased.
- the third wavelength conversion unit 116 is a material whose degree of scattering when the light of the light source incident from the third incident unit 116a travels toward the third output unit 116b is smaller than that of a polycrystalline material. Therefore, the ratio of the light traveling from the third incident portion 116a to the third emitting portion 116b is increased, and the directivity of the converted light CL3 of the third color emitted from the third emitting portion 161b is increased. Become stronger.
- the first color conversion light CL1, the second color conversion light CL2 different from the first color, and the third color conversion light CL3 are mixed to provide a single color with strong directivity.
- the third color conversion light CL3 may be the same color as the first color conversion light CL1 or the second color conversion light CL2, or may be a different color. .
- the first wavelength conversion unit 112 is a rod-shaped member, and a first incident portion 112a is formed at one end in the longitudinal direction of the member.
- a first emitting portion 112b is formed at the other end in the longitudinal direction.
- the second wavelength converter 114 is a rod-shaped member, and a second incident portion 114a is formed at one end in the longitudinal direction of the member, and the second incident portion 114a is formed at the other end in the longitudinal direction of the member.
- An emission part 114b is formed.
- the third wavelength conversion section 116 is a rod-shaped member, and a third incident section 116a is formed at one end in the longitudinal direction of the member, and the third wavelength conversion section 116 is formed at the other end in the longitudinal direction of the member.
- An emission part 116b is formed.
- the first wavelength conversion unit 112 preferably has an aspect ratio of 10 or more.
- the second wavelength converter 114 preferably has an aspect ratio of 10 or more.
- the third wavelength converter 116 preferably has an aspect ratio of 10 or more.
- a polycrystalline phosphor is an aggregate of very small single crystals (crystallites) of about several tens of nanometers, and there is an interface called a crystal grain boundary between crystallites. A lot of light scattering and shielding occur. Therefore, each wavelength conversion unit according to Example 6 is made of a material whose degree of scattering when the light from the light emitting element incident from the incident unit travels to the output unit is smaller than that of a polycrystalline material. .
- the degree of scattering can be regarded as the ratio of light refracted and reflected from the light emitting element incident from the incident portion, and if the ratio is low, the degree of scattering is small.
- the degree of scattering is smaller when the light traveling direction changes by only 10 ° than when the light traveling direction changes by 30 ° during scattering.
- each wavelength conversion unit is composed of a single crystal material or a ceramic material
- an angle formed between the main axis of the single crystal material or the ceramic material and a straight line connecting the incident portion and the emission portion is within ⁇ 5 °, more preferably It should be within ⁇ 3 °.
- the straight line connecting the incident part and the emission part is, for example, a straight line that intersects the incidence part and the emission part, and can be said to have the shortest length.
- it may be a normal line of at least one surface of the entrance portion and the exit portion and a straight line intersecting with the other surface.
- the main axis is a direction in which light is not separated even when light is incident in a birefringent crystal having optical anisotropy, and can also be called an optical axis.
- Uniaxial crystals belong to the hexagonal system and tetragonal system, and biaxial crystals belong to the orthorhombic system, monoclinic system, and triclinic system.
- An isotropic crystal such as a cubic crystal does not have a main axis. Thereby, the light parallel to the main axis can easily reach the emission part, and the directivity of the light emitted from the emission part can be further enhanced.
- the fluorescent member 210 according to Example 6 uses a chloroapatite single crystal phosphor as the second wavelength conversion unit 114, and a chlorometasilicate single crystal phosphor as the first wavelength conversion unit 112 and the third wavelength conversion unit 116. Is used.
- This single crystal phosphor has a composition of Ca 5 (PO 4 ) 3 Cl: Eu 2+ , an outer diameter of 200 ⁇ m, an inner diameter of 100 ⁇ m, a length of 50 mm, and grows in the c-axis direction, with a hollow center portion.
- a hexagonal chloroapatite single crystal phosphor (hereinafter sometimes referred to as “tube phosphor”) was obtained.
- FIG. 15 is a graph showing an emission spectrum of the chloroapatite single crystal phosphor according to Example 6. As shown in FIG. 15, the chloroapatite single crystal phosphor according to Example 6 is a phosphor that emits blue light by excitation light having a wavelength of 405 nm.
- a SiO 2 film is formed on the surface of the tube type phosphor.
- a tube type heated to 350 ° C. using a carrier gas in which an organic silicon compound typified by tetramethoxysilane (TEOS; Si (OCH 3 ) 4 ) and oxygen are mixed.
- TEOS tetramethoxysilane
- Si (OCH 3 ) 4 tetramethoxysilane
- a film of SiO 2 having a thickness of 0.2 ⁇ m was formed on the phosphor.
- a chlorometasilicate single crystal phosphor is formed on the inner side surface and the outer side surface of the tube-type phosphor coated with SiO 2 , and this corresponds to the first wavelength conversion unit 112 and the third wavelength conversion unit 116.
- This chlorometasilicate single crystal phosphor is a phosphor that exhibits a broad yellow emission having a peak at a wavelength of 580 nm by excitation light having a wavelength of 405 nm.
- the obtained rod-shaped composite was cut into a length of 40 mm with a slicer, and the cut surface and side surfaces were polished to prepare the rod shape.
- oxide dielectric thin films (Ta 2 O 5 (60 nm) / SiO 2 (30 nm)) having different refractive indexes are alternately formed a plurality of times using an ion-assisted deposition apparatus, A laminate was formed. Next, silver (200 nm) was formed on the laminated body, and SiO 2 (50 nm) was further formed thereon as a protective film to form a side reflection film 120. As a result, light that has leaked to the outside from a part of the surface until then is internally reflected by the side reflection film 120 and emitted from the emission surface, so that the light utilization efficiency can be improved.
- the incident surface 122 of the fluorescent member 210 has a surface roughness (arithmetic average roughness Ra) of about 50 nm (50 nm ⁇ 10 nm) by precision polishing. Thereafter, an oxide dielectric thin film having a different refractive index was alternately formed a plurality of times on the incident surface 122 by using an ion-assisted vapor deposition apparatus to form a laminated body. This laminate exhibits the optical performance of a short-pass filter.
- the transmittance of light having a wavelength of less than 420 nm is 96% or more, but the transmittance of light having a wavelength of 420 nm or more is less than 1%.
- the emission surface 124 of the fluorescent member 210 has a surface roughness (arithmetic average roughness Ra) of about 30 nm (30 nm ⁇ 10 nm) by precision polishing. Thereafter, an oxide dielectric thin film having a different refractive index was alternately formed a plurality of times on the emission surface 124 by using an ion-assisted vapor deposition apparatus to form a laminate. This laminate exhibits a reflection performance with a reflectance of 90%.
- FIG. 16 is a schematic view of a light emitting module having a fluorescent member according to Example 6.
- the rod-shaped fluorescent member 210 is attached to the tip of an optical fiber 126 having a diameter of 200 ⁇ m (a cylindrical core diameter of 50 ⁇ m and a thickness of a cylindrical cladding covering the core of 75 ⁇ m) with a transparent silicone resin. It is configured.
- the other end (incident side) of the optical fiber 126 is a light emission composed of an InGaN-based LD (Laser diode) element that emits light having a peak wavelength of 405 nm via a condensing / introducing spherical lens and rod lens.
- InGaN-based LD Laser diode
- the element 128 is installed, and purple light is incident on the optical fiber 26.
- the light-emitting element 128 as a light source may be other than the LD element, and a semiconductor light-emitting element such as an LED (Light emitting diode) element or an EL (Electro Luminescence) element is suitable. As long as it is a light source, elements other than those described above may be used.
- the purple light incident on the rod-shaped single crystal fluorescent member 210 through the optical fiber 26 is partially incident on the chloroapatite single crystal phosphor, which is the tube-shaped second wavelength conversion unit 114, and part of the light is tubular.
- Is incident on the chlorometasilicate single crystal phosphor which is the third wavelength conversion unit 116, and part of the light is incident on the chlorometasilicate single crystal phosphor which is the first wavelength conversion unit 112 having a hexagonal column shape.
- FIG. 17 is a diagram showing an emission spectrum of the light emitting module 200.
- FIG. 18 is a schematic diagram of the fluorescent member according to the seventh embodiment.
- the same components as those in the sixth embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
- the fluorescent member 130 includes a cylindrical first wavelength conversion unit 112, a columnar second wavelength conversion unit 132 having an outer diameter smaller than the outer diameter of the first wavelength conversion unit 112, Is provided.
- the second wavelength conversion unit 132 is a second incident unit 132a into which the light L1 of the light source is incident, and a second emission in which the converted light CL2 of the second color which is excited by the incident light and wavelength-converted is emitted.
- the second wavelength conversion unit 132 is made of a material whose degree of scattering when the light from the light source incident from the second incident unit 132a travels toward the second emission unit 132b is smaller than that of a polycrystalline material. Has been.
- the proportion of light traveling from the first incident unit 112a to the first emission unit 112b increases, and the first color converted light CL1 emitted from the first emission unit 112b.
- the ratio of the light traveling from the second incident unit 132a to the second emission unit 132b increases, and the second color conversion light CL2 emitted from the second emission unit 132b. The directivity of becomes stronger.
- the light emission L2 of various colors that are highly directional and cannot be realized by a single color is generated. It becomes possible.
- the second wavelength conversion unit 132 is a rod-shaped member, and a second incident portion 132a is formed at one end in the longitudinal direction of the member. A second emitting portion 132b is formed at the other end in the longitudinal direction.
- each wavelength conversion unit in the fluorescent member 130 according to Example 7 a chloroapatite single crystal phosphor is used as the second wavelength conversion unit 132, and a chlorometasilicate single crystal phosphor is used as the first wavelength conversion unit 112.
- This single crystal phosphor has a composition of Ca 5 (PO 4 ) 3 Cl: Eu 2+ , an outer diameter of 200 ⁇ m, a length of 60 mm, and is a solid hexagonal chloroapatite single crystal grown in the c-axis direction.
- a phosphor (hereinafter sometimes referred to as “columnar phosphor”) was obtained.
- This columnar phosphor exhibits an emission spectrum similar to that of the chloroapatite single crystal phosphor according to Example 6.
- the chloroapatite single crystal phosphor according to Example 7 is a phosphor that emits blue light by excitation light having a wavelength of 400 nm.
- a chlorometasilicate single crystal phosphor is formed on the outer surface of the columnar phosphor coated with SiO 2 , and this corresponds to the first wavelength conversion unit 112.
- This chlorometasilicate single crystal phosphor is a phosphor that exhibits a broad yellow emission having a peak at a wavelength of 580 nm by excitation light having a wavelength of 405 nm.
- the obtained rod-shaped composite was cut into a length of 50 mm with a slicer, and the cut surface and side surfaces were polished to prepare a rod shape.
- the side surface reflection film 120 is formed in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 130 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 130 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to the seventh embodiment has the same configuration as that of the light emitting module 200 according to the sixth embodiment, and emits white light having strong directivity due to color mixture of blue light and yellow light.
- FIG. 19 is a schematic diagram of the fluorescent member according to the eighth embodiment.
- the same components as those in the sixth and seventh embodiments are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
- the fluorescent member 140 according to Example 8 includes a cylindrical first wavelength conversion unit 142 and a columnar second wavelength conversion unit 144 having an outer diameter smaller than the outer diameter of the first wavelength conversion unit 142. .
- the first wavelength conversion unit 142 has an annular first incident unit 142a on which the light L1 of the light source is incident, and an annular first unit that converts the wavelength-converted first color converted light CL1 that is excited by the incident light. And a first emission portion 142b.
- the second wavelength conversion unit 144 is a second incident unit 144a on which the light L1 of the light source is incident, and a second emission in which the converted light CL2 of the second color which is excited by the incident light and converted in wavelength is emitted. Part 144b.
- the first wavelength conversion unit 142 is made of a material whose degree of scattering when the light from the light source incident from the first incident unit 142a travels toward the first emitting unit 142b is smaller than that of a polycrystalline material.
- the second wavelength conversion unit 144 is made of a material whose degree of scattering when the light from the light source incident from the second incident unit 144a travels toward the second output unit 144b is smaller than that of a polycrystalline material. Has been.
- the ratio of light traveling from the first incident unit 142a to the first emission unit 142b increases, and the first color converted light CL1 emitted from the first emission unit 142b.
- the ratio of the light traveling from the second incident unit 144a to the second output unit 144b increases, and the second color converted light CL2 emitted from the second output unit 144b. The directivity of becomes stronger.
- the light emission L2 of various colors that are highly directional and cannot be realized by a single color is generated. It becomes possible.
- each wavelength converter in the fluorescent member 140 according to Example 8 a chlorometasilicate single crystal phosphor is used as the second wavelength conversion unit 144, and a chloroapatite single crystal phosphor is used as the first wavelength conversion unit 142.
- This single crystal phosphor is a phosphor that emits broad yellow light having a peak near a wavelength of 580 nm by excitation light having a peak wavelength of 405 nm.
- FIG. 1 A chlorometasilicate single crystal phosphor grown to a particle size of 4 mm was obtained.
- the obtained single crystal phosphor is cut with a slicer along the optical axis direction while confirming the optical axis direction not showing the birefringence by X-ray diffraction.
- the cut single crystal phosphor was ground and polished into a shape with a thickness of 100 ⁇ m, and then cut into a length of 3 mm with a slicer to prepare a rod shape.
- This single crystal phosphor is a phosphor that emits broad yellow light having a peak near a wavelength of 580 nm by excitation light having a peak wavelength of 405 nm.
- the chlorometasilicate single crystal phosphor according to Example 8 is a phosphor that emits yellow light by excitation light having a wavelength of 405 nm.
- the rod of the chlorometasilicate single crystal phosphor may be referred to as a yellow rod phosphor.
- a SiO 2 film is formed on the surface of the yellow rod phosphor.
- a yellow rod heated to 200 ° C. using a carrier gas in which an organic silicon compound typified by tetramethoxysilane (TEOS; Si (OCH 3 ) 4 ) and oxygen is mixed in a plasma CVD apparatus.
- TEOS tetramethoxysilane
- Si (OCH 3 ) 4 tetramethoxysilane
- a SiO 2 film having a thickness of 0.2 ⁇ m was formed on the type phosphor.
- the yellow rod phosphor was irradiated with an infrared lamp for 3 minutes to make the formed film robust.
- a chloroapatite single crystal phosphor is formed on the outer surface of the yellow rod phosphor coated with SiO 2 , and this corresponds to the first wavelength conversion unit 142.
- This chloroapatite single crystal phosphor is a phosphor that exhibits broad blue emission having a peak at a wavelength of 460 nm by excitation light having a wavelength of 400 nm.
- the obtained rod-shaped composite was cut into a length of 3 mm with a slicer, and the cut surface and side surfaces were polished to prepare the rod shape.
- the side reflection film 120 is formed on the side surface 118 of the fluorescent member 140 in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 140 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 140 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to the eighth embodiment has the same configuration as that of the light emitting module 200 according to the sixth embodiment, and emits white light having strong directivity due to color mixture of blue light and yellow light.
- Example 9 The configuration of the fluorescent member according to the ninth embodiment is substantially the same as that of the fluorescent member 140 according to the eighth embodiment.
- a yellow rod phosphor is produced by the same method as in Example 8.
- a SiO 2 film is formed on the surface of the yellow rod phosphor.
- a carrier gas in which an organic silicon compound typified by tetramethoxysilane (TEOS; Si (OCH 3 ) 4 ) and oxygen are mixed is used at 300 ° C.
- TEOS tetramethoxysilane
- Si (OCH 3 ) 4 tetramethoxysilane
- the yellow rod-type phosphor heated at a high temperature was irradiated with a plasma discharge at a high frequency of 14 MHz and 2 W / cm 2 to form a SiO 2 film having a thickness of 0.2 ⁇ m.
- chloroapatite single crystal phosphor was formed on the outer surface of the yellow rod phosphor coated with SiO 2 .
- This chloroapatite single crystal phosphor is a phosphor that emits blue light having a peak at a wavelength of 460 nm by excitation light having a wavelength of 400 nm.
- the light emitting module according to the ninth embodiment emits white light having a strong directivity due to the color mixture of blue light and yellow light, as in the light emitting modules according to the above-described embodiments.
- FIG. 21 is a schematic diagram of the fluorescent member according to the tenth embodiment.
- the same components as those in Examples 6 to 9 are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
- the fluorescent member 150 includes a cylindrical first wavelength conversion unit 152 and a columnar second wavelength conversion unit 154 having an outer diameter smaller than the outer diameter of the first wavelength conversion unit 152. .
- a nanocomposite phosphor is used as the second wavelength conversion unit 154, and a chlorometasilicate single crystal phosphor is used as the first wavelength conversion unit 152.
- nanocomposite phosphor in which a phosphor single crystal (Ca, Eu) I 2 having a diameter of about 50 nm is dispersed in an SiO 2 fiber having a diameter of 200 ⁇ m and a length of 10 mm is dispersed.
- FIG. 22 is a graph showing an emission spectrum of the nanocomposite phosphor according to Example 10.
- the nanocomposite phosphor according to Example 10 is a phosphor that emits blue light having a peak near a wavelength of 465 nm by excitation light having a peak wavelength of 405 nm.
- a SiO 2 film is formed on the surface of the nanocomposite phosphor.
- a nanocomposite heated to 400 ° C. using a carrier gas in which an organic silicon compound typified by tetramethoxysilane (TEOS; Si (OCH 3 ) 4 ) and oxygen is mixed in a plasma CVD apparatus.
- TEOS tetramethoxysilane
- Si (OCH 3 ) 4 oxygen
- a chlorometasilicate single crystal phosphor is formed on the outer surface of the nanocomposite phosphor coated with SiO 2 , and this corresponds to the first wavelength conversion unit 152.
- This chlorometasilicate single crystal phosphor is a phosphor that exhibits a broad yellow emission having a peak at a wavelength of 580 nm by excitation light having a wavelength of 405 nm.
- the obtained rod-shaped composite was cut into a length of 8 mm with a slicer, and the cut surface and side surfaces were polished to prepare the rod shape.
- the side reflection film 120 is formed on the side surface 118 of the fluorescent member 150 in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 150 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 150 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to Example 10 has the same configuration as that of the light emitting module 200 according to Example 6. Purple light incident on the rod through the optical fiber is converted into a nanocomposite phosphor rod (single crystal (Ca, Eu) A nanocomposite phosphor dispersed with I 2 ) and a chlorometasilicate single crystal phosphor are converted into white light having strong directivity.
- a nanocomposite phosphor rod single crystal (Ca, Eu)
- I 2 single crystal
- chlorometasilicate single crystal phosphor are converted into white light having strong directivity.
- FIG. 23 is a schematic diagram of the fluorescent member according to the eleventh embodiment.
- the same components as those in Examples 6 to 10 are denoted by the same reference numerals and description thereof is omitted as appropriate.
- the fluorescent member 160 includes a cylindrical first wavelength conversion unit 162 and a cylindrical second wavelength conversion unit 164 having an outer diameter smaller than the outer diameter of the first wavelength conversion unit 162. .
- the fluorescent member 160 according to Example 11 uses a chlorometasilicate single crystal phosphor as the second wavelength conversion unit 164 and a nanocomposite phosphor as the first wavelength conversion unit 162.
- a chlorometasilicate single crystal phosphor grown to a particle size of 8 mm was obtained.
- the obtained crystal is cut with a slicer along the optical axis direction while confirming the optical axis direction showing no birefringence by X-ray diffraction.
- the cut single crystal phosphor was ground and polished into a shape having a thickness of 100 ⁇ m, and then cut into a length of 6 mm with a slicer to prepare a rod shape.
- This single crystal phosphor is a phosphor that emits broad yellow light having a peak near a wavelength of 580 nm by excitation light having a peak wavelength of 405 nm.
- a SiO 2 film is formed on the surface of the yellow rod phosphor.
- a yellow rod heated to 200 ° C. using a carrier gas in which an organic silicon compound typified by tetramethoxysilane (TEOS; Si (OCH 3 ) 4 ) and oxygen is mixed in a plasma CVD apparatus.
- TEOS tetramethoxysilane
- Si (OCH 3 ) 4 tetramethoxysilane
- a SiO 2 film having a thickness of 0.2 ⁇ m was formed on the type phosphor.
- the yellow rod phosphor was irradiated with an infrared lamp for 3 minutes to make the formed film robust.
- a nanocomposite phosphor is formed on the outer surface of the yellow rod phosphor coated with SiO 2 .
- the nanocomposite phosphor uses SiO 2 , CaI 2 , Eu 2 O 3 , and NH 4 Cl as starting materials.
- This raw material mixture is pulverized and mixed in an alumina mortar in a glove in a dry nitrogen atmosphere.
- the side reflection film 120 is formed on the side surface 118 of the fluorescent member 160 in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 160 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 160 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to Example 11 has the same configuration as that of the light emitting module 200 according to Example 6, and purple light incident on the rod through the optical fiber is converted into a nanocomposite phosphor rod (single crystal (Ca, Eu) A nanocomposite phosphor dispersed with I 2 ) and a chlorometasilicate single crystal phosphor are converted into white light having strong directivity.
- a nanocomposite phosphor rod single crystal (Ca, Eu)
- I 2 single crystal
- chlorometasilicate single crystal phosphor are converted into white light having strong directivity.
- FIG. 24 is a schematic diagram of the fluorescent member according to the twelfth embodiment.
- the same components as those in Examples 6 to 11 are denoted by the same reference numerals and description thereof is omitted as appropriate.
- the fluorescent member 170 according to Example 12 includes a columnar first wavelength conversion unit 172 and a columnar second wavelength conversion unit 174.
- the first wavelength conversion unit 172 and the second wavelength conversion unit 174 have substantially the same diameter.
- the first emission unit 172b of the first wavelength conversion unit 172 and the second incident unit 174a of the second wavelength conversion unit 174 are arranged to face each other.
- each wavelength converter in the fluorescent member 170 according to Example 12 a chloroapatite single crystal phosphor is used as the first wavelength conversion unit 172, and a chlorometasilicate single crystal phosphor is used as the second wavelength conversion unit 174.
- a chlorometasilicate single crystal phosphor grown to a particle size of 8 mm was obtained.
- the obtained single crystal phosphor is cut with a slicer along the optical axis direction while confirming the optical axis direction not showing the birefringence by X-ray diffraction.
- the cut single crystal phosphor was ground and polished into a shape having a thickness of 100 ⁇ m, and then cut into a length of 6 mm with a slicer to prepare a rod shape.
- This single crystal phosphor is a phosphor that emits broad yellow light having a peak near a wavelength of 580 nm by excitation light having a peak wavelength of 400 nm.
- the rod of the chlorometasilicate single crystal phosphor may be referred to as a yellow rod phosphor.
- This single crystal phosphor has a composition of Ca 5 (PO 4 ) 3 Cl: Eu 2+ , a length of 8 mm, and grown in the c-axis direction. , Sometimes referred to as “columnar phosphor”).
- This columnar phosphor exhibits an emission spectrum similar to that of the chloroapatite single crystal phosphor according to Example 6.
- the obtained hexagonal chloroapatite single crystal phosphor was cut to a length of 6 mm with a slicer, cut to a thickness of ⁇ 100 ⁇ m, and the cut surface and side surfaces were polished to prepare a rod shape.
- this chloroapatite single crystal phosphor rod is referred to as a blue rod phosphor.
- the surface of the yellow rod phosphor and the surface of the blue rod phosphor are joined at room temperature. Specifically, both phosphors are polished so that the surface roughness of the bonding surface is Ra or less. Then, in a high vacuum (up to 10 ⁇ 5 Pa or less), the bonding surfaces are set up and down at regular intervals (2 mm), and the oxide film layers and adsorbed molecules on the surfaces of the two materials are etched with an argon beam. Thereafter, the joining surfaces are aligned and pressed to join. Alternatively, the bonding strength may be increased by bonding by optical contact and heating at 600 ° C. for 1 h.
- the joined rod-shaped composite was cut to a length of 10 mm with a slicer, and the cut surface and side surfaces were polished into a shape having a thickness of 100 ⁇ m to prepare the rod shape.
- the side reflection film 120 is formed on the side surface 118 of the fluorescent member 170 in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 170 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 170 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to Example 12 has the same configuration as that of the light emitting module 200 according to Example 6, and emits white light having strong directivity due to the color mixture of blue light and yellow light.
- FIG. 25 is a schematic diagram of a fluorescent member according to Example 13.
- the same components as those in Examples 6 to 7 are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
- the fluorescent member 180 includes a columnar first wavelength conversion unit 182, a columnar second wavelength conversion unit 184, a first wavelength conversion unit 182, and a second wavelength conversion unit 184. And a cylindrical buffer layer 186 provided between the two.
- the diameters of the first wavelength conversion unit 182, the second wavelength conversion unit 184, and the buffer layer 186 are substantially the same.
- the first emission unit 182b of the first wavelength conversion unit 182 and the second incident unit 184a of the second wavelength conversion unit 184 are arranged to face each other with the buffer layer 186 interposed therebetween.
- each wavelength conversion unit and the buffer layer in the fluorescent member 180 according to Example 13 will be described.
- a chloroapatite single crystal phosphor is used as the first wavelength conversion unit 182
- a chlorometasilicate single crystal phosphor is used as the second wavelength conversion unit 184.
- the second wavelength conversion unit 184 is manufactured.
- the manufacturing method of the second wavelength conversion unit 184 is the same as that of the second wavelength conversion unit 174 according to the twelfth embodiment.
- a chloroapatite single crystal phosphor to be the first wavelength conversion unit 182 is produced.
- the manufacturing method of the first wavelength conversion unit 182 is the same as that of the first wavelength conversion unit 172 according to the twelfth embodiment.
- the buffer layer 186 is provided between the first wavelength conversion unit 182 and the second wavelength conversion unit 184 and bonded to each other.
- the buffer layer 186 has a rod shape with a thickness of ⁇ 250 ⁇ m and a length of 1 mm, and the outer shape is adjusted by polishing the cut surface and side surfaces.
- the rod is preferably SiO 2 based silicate glass, quartz or fluoride glass.
- the first wavelength conversion unit 182 and the buffer layer 186 are joined. Specifically, each bonded surface is sufficiently polished and washed, and then applied to the bonded surface by spin coating so that the sol-gel material has a film thickness of 0.3 ⁇ m. Then, it vacuum-dried rapidly, the mutual joint surface was contacted, it pinched
- the joined rod-shaped composite was cut into a length of 10 mm with a slicer, and the cut surface and side surfaces were polished into a shape having a thickness of 250 ⁇ m to prepare the rod shape.
- the side reflection film 120 is formed on the side surface 118 of the fluorescent member 180 in the same manner as the fluorescent member 210 of the sixth embodiment.
- the incident surface of the fluorescent member 180 has the same configuration as the incident surface 122 of the fluorescent member 210 according to the sixth embodiment.
- the emission surface of the fluorescent member 180 has the same configuration as the emission surface 124 of the fluorescent member 210 according to the sixth embodiment.
- the light emitting module having the fluorescent member according to Example 13 has the same configuration as that of the light emitting module 200 according to Example 6, and emits white light having strong directivity due to color mixture of blue light and yellow light.
- the light emitting modules according to the above-described embodiments can realize light with high directivity. Highly directional light can be used in various fields such as medical devices, optical devices, and communication light sources. In particular, in the case of a light source that can emit white light, it can be applied to illumination and display backlights that are more efficient than LEDs.
- a tumor-affinity photosensitizer is injected intravenously, and after several hours, a bronchoscope is used to Irradiate the lesion with a directional light source. Thereby, the position of a lesion can be grasped with high accuracy.
- Light source of small apparatus such as wearable terminal
- the light emitting module according to each of the above-described embodiments can be applied as an energy-saving and compact strong directional light source.
- the light-emitting module according to each of the above-described embodiments can realize light emitted from a smaller region and a high luminous flux, it can be used as a light source for a lamp with higher luminance. In particular, it can be used for an automotive lamp that requires power saving and downsizing.
- the light emitting module according to each of the above-described embodiments can be used for a lighting device for a minute portion such as a projector, an optical microscope, or a fluorescence microscope.
- a light source for a laser pointer when used as a light source for a laser pointer, light does not bleed even when the distance is long, such as when using a giant screen. It can also be used as a light source for illumination used in laser shows.
- the present invention can be used for fluorescent members and light emitting modules.
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Abstract
Description
前述のように多結晶の蛍光体は、結晶子間に結晶粒界と呼ばれる界面が存在する。この界面により、多結晶の蛍光体において光の直進性を確保することは困難である。そこで、光の直線性を確保するため、波長変換部として以下の素材が好適である。
単結晶蛍光体は、全体が結晶格子および結晶軸を揃えた構造からなる。このような単結晶蛍光体は、気相成長、蛍光体融液成長、溶媒(フラックス)での溶液成長、または、水熱成長により得ることができる。
ナノコンポジット材料は、蛍光発光波長の1/4以下のサイズ(φ約100nm以下)の蛍光成分を分散したガラスセラミックスである。
透光性セラミックス蛍光体は、一次粒子500nm以下の粗原料を緻密に成形、焼結することで得られる。透明なマトリックスだけでは、原子内の電子遷移によって発せられる無指向性の蛍光体発光に指向性を与えることは困難である。そこで、後述に規定するように、形状、表面性状を工夫することで指向性のある波長変換部を実現できる。
蛍光体の形状は、発光に指向性を付与するために、照射方向に沿った辺を長辺とした高いアスペクト比を持つロッド状が好ましい。以下では、ロッド径(短辺)、ロッド長(長辺)、アスペクト比(長辺/短辺)の好ましい範囲について説明する。
ロッドの側面は、励起光(素子光)や蛍光(波長変換光)が外部へ露光することを防ぐため、反射膜で覆われている。反射膜は、誘電体からなる全反射膜、可視光に吸収を示さない金属反射膜、又は、誘電体層と金属反射層のハイブリッドからなる増反射膜で構成される。
(発光モジュール)
以上の観点を考慮した好ましい形態の発光モジュールについて以下に説明する。図1は、第1の実施の形態に係る発光モジュールの模式図である。発光モジュール100は、光源としての発光素子10と、波長変換部12と、を備えている。発光素子10は、LED(Light emitting diode)素子、LD(Laser diode)素子、EL(Electro Luminescence)素子等の半導体発光素子が好適であるが、指向性の強い発光が可能な光源であれば前述以外の素子であってもよい。
はじめにアパタイト蛍光体からなる単結晶ロッドの製造方法について説明する。出発原料として、CaCO3、CaHPO4・2H2O、Eu2O3、NH4Cl、CaCl2の各原料を、これらのモル比がCaCO3:CaHPO4・2H2O:Eu2O3:NH4Cl:CaCl2=1.8:3.0:0.10:1.0:5.0となるように秤量し、秤量した各原料をアルミナ乳鉢に入れ粉砕混合し、原料混合物を得た。この原料混合物をアルミナ坩堝に入れ、昇温速度100℃/hで1200℃まで加熱し、還元雰囲気の電気炉で所定の雰囲気(H2:N2=5:95)、温度1200℃で10時間焼成(合成)し、次に、800℃まで5℃/hの冷却速度で降温し、その後自然冷却をして焼成物を得た。得られた焼成物を温純水で丹念に洗浄、ろ過し、120℃で1h乾燥し、蛍光体1を得た。
はじめにクロロメタ珪酸塩からなる単結晶ロッドの製造方法について説明する。出発原料として、SiO2、CaCO3、SrCl2・2H2O、Eu2O3、NH4Clの各原料を、これらのモル比がSiO2:CaCO3:SrCl2・2H2O:Eu2O3:NH4Cl=1.0:0.5:0.8:0.2:10.0となるように秤量し、秤量した各原料をアルミナ乳鉢に入れ粉砕混合し、原料混合物を得た。この原料混合物をアルミナ坩堝に入れ、昇温速度100℃/hで1000℃まで加熱し、還元雰囲気の電気炉で所定の雰囲気(H2:N2=5:95)、温度1000℃で30時間焼成(合成)し、次に、700℃まで30℃/hの冷却速度で降温し、その後自然冷却をして焼成物を得た。得られた焼成物を温純水で丹念に洗浄、ろ過し、120℃で1h乾燥し、蛍光体2を得た。
ナノ蛍光成分を分散させたナノコンポジット蛍光体からなるロッドの製造方法について説明する。出発原料として、SiO2ファイバ、CaI2、Eu2O3、NH4Iの各原料を、これらのモル比がSiO2ファイバ:CaI2:Eu2O3:NH4I=1.0:0.1:0.004:0.1となるように秤量し、秤量した各原料をドライ窒素雰囲気のグローブボックス中でアルミナ乳鉢に入れ粉砕混合し、原料混合物を得た。この原料混合物をアルミナ坩堝に入れ、昇温速度100℃/hで1000℃まで加熱し、還元雰囲気の電気炉で所定の雰囲気(H2:N2=5:95)、温度1000℃で15時間焼成(合成)し、その後自然冷却をして焼成物を得た。得られた焼成物を温純水で丹念に洗浄、ろ過し、120℃で1h乾燥し、蛍光体3を得た。
ナノコンポジット蛍光ガラスセラミックスからなるロッドの製造方法について説明する。出発原料として、SiO2、BaF2、AlF3、EuF3の各原料を、これらのモル比がSiO2、BaF2、AlF3、EuF3=60:10:10:20となるように秤量し、アルミナ乳鉢に入れ粉砕混合し、原料混合物を得た。この原料混合物をアルミナ坩堝に入れ、昇温速度100℃/hで1300℃まで加熱し、窒素雰囲気の電気炉で5時間焼成(合成)し、その後自然冷却をすることで、溶融したガラス質を得た。
透光性セラミックスの製造方法について説明する。Y2O3、CeO2を硝酸で溶解した水溶液、Al2(NO3)3を純粋で溶解した水溶液を準備し、この水溶液を濃度調整し、化学量論比に混合し、炭酸水素アンモニウムでpH7~9に調整し、炭酸塩として沈殿させ、混合原料粉末を得た。
はじめにクロロメタ珪酸塩蛍光体からなる焼結体ロッドの製造方法について説明する。出発原料として、SrCO3、SiO2、CaCO3、SrCl2・2H2O、Eu2O3の各原料を、これらのモル比がSrCO3:SiO2:CaCO3:SrCl2・2H2O:Eu2O3=0.3:1.0:0.7:1.0:0.01となるように秤量し、秤量した各原料をアルミナ乳鉢に入れ粉砕混合し、原料混合物を得た。この原料混合物をアルミナ坩堝に入れ、昇温速度100℃/hで1000℃まで加熱し、還元雰囲気の電気炉で所定の雰囲気(H2:N2=5:95)、温度1000℃で3時間焼成(合成)し、その後自然冷却をして焼成物を得た。得られた焼成物を温純水で丹念に洗浄、ろ過し、120℃で1h乾燥し、合成物を得た。
比較例2に係るクロロメタ珪酸塩単結晶を実施例2と同様の方法で得た。得られた単斜晶のクロロメタ珪酸塩単結晶を、スライサー、研削機および研磨機を用いて、一辺310μmの立方体形状に加工した。これは、実施例2の蛍光体単結晶ロッドとほぼ同体積に当たる。
比較例3に係る蛍光体は、実施例1と同様のアパタイト蛍光体単結晶ロッドを実施例1と同形状に加工したものである。しかしながら、本実施の形態に係る蛍光体ロッドは、何も表面処理を施していないことが実施例1と異なる。そして、上記蛍光体を用い、実施例1と同様の構成の発光モジュールを組み立てた
上述の各実施例および各比較例に係る発光モジュールにおいて出射面から出射する光の出射角を測定した。各実施例および各比較例の蛍光体における発光出射立体角および発光色を表1に示す。
粒界による散乱を生じない単結晶では、励起光の透過性も高く、励起光の吸収率が著しく低下する。そこで、本実施の形態に示す発光モジュールのように、波長変換部のロッド形状や反射膜の構成を適宜選択することで、出射光の指向性を高めるだけでなく、励起光の吸収率を高めることもできる。
図11は、第2の実施の形態に係る発光モジュールの模式図である。発光モジュール111は、光源としての発光素子10と、波長変換部12(図1参照)と、光ファイバ14と、放熱部としてのヒートシンク15と、を備える。また、発光モジュール111は、波長変換部12として柱状の蛍光体ロッド18を有する。蛍光体ロッド18の材質の詳細については後述する。
次に、第3の実施の形態に係る蛍光部材および発光モジュールについて、実施例6~13を参照して説明する。
[蛍光部材]
図14は、実施例6に係る蛍光部材の模式図である。図14に示すように、蛍光部材210は、筒状の第1の波長変換部112と、第1の波長変換部112の外径より小さな外径を有する、筒状の第2の波長変換部114と、第2の波長変換部114の外径より小さな外径を有する、柱状の第3の波長変換部116と、を備える。換言すると、第2の波長変換部114は、第1の波長変換部112の孔の内部に設けられており、第3の波長変換部116は、第2の波長変換部114の孔の内部に設けられている。これにより、複数種の波長変換部を備えたコンパクトな蛍光部材を実現できる。
はじめに、第2の波長変換部114の製造方法について説明する。出発原料として、CaHPO4・2H2O、CaCO3、CaCl2、Eu2O3の各原料を、これらのモル比がCaHPO4・2H2O:CaCO3:CaCl2:Eu2O3=3.0:1.5:0.5:0.1となるように秤量し、秤量した各原料をアルミナ乳鉢に入れ粉砕混合した。その後、塩素アパタイト濃度が0.15mol%となるように、NaClを追加、混合した。
得られたロッド状の複合体をスライサーで長さ40mmに切断し、切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材210の側面118には、イオンアシスト蒸着装置を用いて、屈折率の異なる酸化物誘電体薄膜(Ta2O5(60nm)/SiO2(30nm))を交互に複数回成膜し、積層体を形成した。次に、積層体の上に銀(200nm)を成膜し、更にその上に保護膜としてSiO2(50nm)を成膜し、側面反射膜120とした。これにより、それまでは一部の表面から外部へ漏れていた光が側面反射膜120で内面反射され、出射面から出射することとなり、光の利用効率を向上できる。
蛍光部材210の入射面122は、精密研磨加工により表面粗さ(算術平均粗さRa)が50nm程度(50nm±10nm)となるようにした。その後、入射面122には、イオンアシスト蒸着装置を用いて、屈折率の異なる酸化物誘電体薄膜を交互に複数回成膜し、積層体を形成した。この積層体は、ショートパスフィルタの光学性能を示し、波長が420nm未満の光の透過率は96%以上あるが、波長が420nm以上の光の透過率は1%未満である。
蛍光部材210の出射面124は、精密研磨加工により表面粗さ(算術平均粗さRa)が30nm程度(30nm±10nm)となるようにした。その後、出射面124には、イオンアシスト蒸着装置を用いて、屈折率の異なる酸化物誘電体薄膜を交互に複数回成膜し、積層体を形成した。この積層体は、反射率90%の反射性能を示す。
図16は、実施例6に係る蛍光部材を有する発光モジュールの模式図である。発光モジュール200は、上述のロッド状の蛍光部材210を透明のシリコーン樹脂でφ200μm(円柱状のコアの直径50μm、コアを包む円筒状のクラッドの厚み75μm)の光ファイバ126の先に取り付けることで構成されている。なお、光ファイバ126の他端(入射側)には、集光・導入用の球レンズ、ロッドレンズを介して、ピーク波長が405nmの光を発するInGaN系のLD(Laser diode)素子からなる発光素子128が設置され、紫光が光ファイバ26内に入射される。光源としての発光素子128は、LD素子以外であってもよく、LED(Light emitting diode)素子、EL(Electro Luminescence)素子等の半導体発光素子が好適であるが、指向性の強い発光が可能な光源であれば前述以外の素子であってもよい。
図18は、実施例7に係る蛍光部材の模式図である。以下の説明では、実施例6と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部132の製造方法について説明する。出発原料として、CaCO3、CaHPO4・2H2O、Eu2O3、NH4Cl、CaCl2、の各原料を、これらのモル比がCaCO3:CaHPO4・2H2O:Eu2O3:NH4Cl:CaCl2:=1.8:3.0:0.1:1.0:5.0となるように秤量し、秤量した各原料をアルミナ乳鉢に入れ粉砕混合した。
得られたロッド状の複合体をスライサーで長さ50mmに切断し、切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材130の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材130の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材130の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例7に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、青色光と黄色光との混色により強い指向性を示す白色光を発する。
図19は、実施例8に係る蛍光部材の模式図である。以下の説明では、実施例6、実施例7と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部144の製造方法について説明する。クロロメタ珪酸塩単結晶蛍光体は、出発原料として、SiO2、CaCO3、SrCl2・2H2O、Eu2O3、NH4Clの各原料を、これらのモル比がSiO2:CaCO3、SrCl2・2H2O:Eu2O3、NH4Cl=1.0:0.5:0.8:0.2:5.0となるように秤量する。この原料混合物をアルミナ乳鉢で粉砕、混合する。
得られたロッド状の複合体をスライサーで長さ3mmに切断し、切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材140の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材140の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材140の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例8に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、青色光と黄色光との混色により強い指向性を示す白色光を発する。
実施例9に係る蛍光部材の構成は、実施例8に係る蛍光部材140とほぼ同じである。はじめに、実施例8と同様の方法によって黄色ロッド蛍光体を作製する。次に、黄色ロッド蛍光体の表面に、SiO2膜を成膜する。具体的には、高周波放電装置を備えたプラズマCVD装置にて、テトラメトキシシラン(TEOS;Si(OCH3)4)を代表とする有機シリコン化合物と酸素を混合させたキャリアガスを使い、300℃に加温した黄色ロッド型蛍光体に、14MHz、2W/cm2で高周波によるプラズマ放電を照射し、SiO2を0.2μmの厚みで成膜した。
図21は、実施例10に係る蛍光部材の模式図である。以下の説明では、実施例6~9と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部154の製造方法について説明する。ナノコンポジット蛍光体は、出発原料として、SiO2ファイバ、CaI2、Eu2O3、NH4Clを用いる。そして、CaI2、Eu2O3、NH4Clの各原料を、これらのモル比がCaI2:Eu2O3:NH4Cl=0.1:0.004:0.1となるように秤量する。この原料混合物をアルミナ乳鉢で粉砕、混合した後、SiO2ファイバ(φ200μm、長さ10mm)を3本更に混合する。
得られたロッド状の複合体をスライサーで長さ8mmに切断し、切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材150の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材150の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材150の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例10に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、光ファイバを通してロッドに入射された紫光は、ナノコンポジット蛍光体ロッド(単結晶(Ca,Eu)I2が分散したナノコンポジット蛍光体)とクロロメタ珪酸塩単結晶蛍光体により、強い指向性を示す白色光に変換される。
図23は、実施例11に係る蛍光部材の模式図である。以下の説明では、実施例6~10と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部164の製造方法について説明する。クロロメタ珪酸塩単結晶蛍光体は、出発原料として、SiO2、CaCO3、SrCl2・2H2O、Eu2O3、NH4Clの各原料を、これらのモル比がSiO2:CaCO3、SrCl2・2H2O:Eu2O3、NH4Cl=1.0:0.5:0.8:0.2:5.0となるように秤量する。この原料混合物をアルミナ乳鉢で粉砕、混合する。
[形状調整]
得られたロッド状の複合体をスライサーで長さ6mmに切断し、切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材160の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材160の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材160の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例11に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、光ファイバを通してロッドに入射された紫光は、ナノコンポジット蛍光体ロッド(単結晶(Ca,Eu)I2が分散したナノコンポジット蛍光体)とクロロメタ珪酸塩単結晶蛍光体により、強い指向性を示す白色光に変換される。
図24は、実施例12に係る蛍光部材の模式図である。以下の説明では、実施例6~11と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部174の製造方法について説明する。クロロメタ珪酸塩単結晶蛍光体は、出発原料として、SiO2、CaCO3、SrCl2・2H2O、Eu2O3、NH4Clの各原料を、これらのモル比がSiO2:CaCO3、SrCl2・2H2O:Eu2O3、NH4Cl=1.0:0.5:0.8:0.2:5.0となるように秤量する。この原料混合物をアルミナ乳鉢で粉砕、混合する。
接合されたロッド状の複合体をスライサーで長さ10mmに切断し、太さ100μmの形状に切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材170の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材170の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材170の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例12に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、青色光と黄色光との混色により強い指向性を示す白色光を発する。
図25は、実施例13に係る蛍光部材の模式図である。以下の説明では、実施例6~7と同様の構成については同じ符号を付して説明を適宜省略する。
はじめに、第2の波長変換部184を製造する。第2の波長変換部184の製造方法は、実施例12に係る第2の波長変換部174と同様である。
接合されたロッド状の複合体をスライサーで長さ10mmに切断し、太さ250μmの形状に切断面及び側面を研磨して、ロッド形状を整えた。
蛍光部材180の側面118は、実施例6の蛍光部材210と同様に側面反射膜120が形成されている。
蛍光部材180の入射面は、実施例6に係る蛍光部材210の入射面122と同様の構成である。
蛍光部材180の出射面は、実施例6に係る蛍光部材210の出射面124と同様の構成である。
実施例13に係る蛍光部材を有する発光モジュールは、実施例6に係る発光モジュール200と同様の構成であり、青色光と黄色光との混色により強い指向性を示す白色光を発する。
上述の各実施例に係る発光モジュールは、指向性の高い光を実現できる。指向性の高い光は、例えば、医療機器、光学機器、通信用光源など様々な分野に利用できる。中でも、白色光が出せる光源の場合、LEDよりも高効率な照明やディスプレイ用バックライトへの適用が可能となる。
肺の中の病巣での腫瘍と正常細胞を区別して診断するために、腫瘍親和性の光感性物質を静脈内注射し、数時間後、気管支鏡を使って、強指向性光源を病巣部に照射する。これにより、病巣の位置を精度良く把握できる。
耳の穴を通して指向性の高い光を照射する。これにより、照射時間が短くてもウツを緩和する効果を高めることができる。
上述の各実施例に係る発光モジュールは、省エネルギかつコンパクトな強指向性光源として適用が可能となる。
上述の各実施例に係る発光モジュールは、より小さい領域からの出射光と高い光束を実現できることから、より高輝度のランプの光源に利用できる。特に、省電力、小型化が求められる自動車用ランプに利用できる。
上述の各実施例に係る発光モジュールは、プロジェクタ、光学顕微鏡、蛍光顕微鏡等の微小部分への照明装置に利用できる。また、レーザポインタの光源に利用することで、巨大スクリーンで使うときのように距離が離れていても光がにじまない。また、レーザショーで用いる照明の光源としても利用できる。
Claims (26)
- 光源の光が入射する入射部と、入射した光により励起され、波長変換された変換光が出射する出射部とを有する波長変換部と、
前記波長変換部の表面の少なくとも一部に設けられた反射部と、を備え、
前記波長変換部は、前記入射部から入射した光源の光が前記出射部へ向かう際に散乱する程度が、多結晶材料の場合と比較して小さい材料で構成されている、
ことを特徴とする蛍光部材。 - 前記波長変換部は、ロッド状の部材であり、該部材の長手方向の両端に前記入射部および前記出射部が形成されていることを特徴とする請求項1に記載の蛍光部材。
- 前記波長変換部は、アスペクト比が10~100であることを特徴とする請求項2に記載の蛍光部材。
- 前記波長変換部は、多角柱または円柱であり、前記入射部および前記出射部とは異なる側面に前記反射部が設けられていることを特徴とする請求項2または3に記載の蛍光部材。
- 前記波長変換部は、単結晶材料またはセラミックス材料で構成されており、前記単結晶材料または前記セラミックス材料の主軸と、前記入射部および前記出射部を結ぶ直線との成す角が±5°以内であることを特徴とする請求項1乃至4のいずれか1項に記載の蛍光部材。
- 光源と、
前記光源の光が入射する入射部と、入射した光により励起され、波長変換された変換光が出射する出射部とを有する波長変換部と、を備え、
前記波長変換部は、前記入射部から入射した光源の光が前記出射部へ向かう際に散乱する程度が、多結晶材料の場合と比較して小さい材料で構成されている、
ことを特徴とする発光モジュール。 - 前記波長変換部は、ロッド状の部材であり、該部材の長手方向の両端に前記入射部および前記出射部が形成されていることを特徴とする請求項6に記載の発光モジュール。
- 前記波長変換部は、アスペクト比が10~100であることを特徴とする請求項7に記載の発光モジュール。
- 前記波長変換部の表面の少なくとも一部に設けられた反射部を更に備え、
前記波長変換部は、多角柱または円柱であり、前記入射部および前記出射部とは異なる側面に前記反射部が設けられていることを特徴とする請求項7または8に記載の発光モジュール。 - 前記波長変換部は、単結晶材料またはセラミックス材料で構成されており、前記単結晶材料または前記セラミックス材料の主軸と、前記光源の光軸との成す角が±5°以内であることを特徴とする請求項6乃至9のいずれか1項に記載の発光モジュール。
- 光源と、
光源の光が入射する入射部と、入射した光により励起され、波長変換された変換光が出射する出射部と、前記入射部および前記出射部とは異なる側面と、を有する波長変換部と、
前記側面の少なくとも一部を覆うように設けられた放熱部と、を備え、
前記波長変換部は、前記入射部から入射した光源の光に対して指向性を有するように構成されていることを特徴とする発光モジュール。 - 前記放熱部は、熱伝導率が50[W/(m・K)]以上の材料が用いられていることを特徴とする請求項11に記載の発光モジュール。
- 前記側面と前記放熱部との間に設けられた反射部を更に備え、
前記反射部は、前記波長変換部に入射した光源の光を内面反射するように構成されており、可視光反射率が80%以上の材料が用いられていることを特徴とする請求項11または12に記載の発光モジュール。 - 前記波長変換部は、前記入射部から入射した光源の光が前記出射部へ向かう際に散乱する程度が、前記入射部から入射した光源の光が前記側面へ向かう際に散乱する程度と比較して小さくなるように構成されていることを特徴とする請求項11乃至13のいずれか1項に記載の発光モジュール。
- 前記波長変換部は、ロッド状の部材であり、該部材の長手方向の両端に前記入射部および前記出射部が形成されていることを特徴とする請求項11乃至14のいずれか1項に記載の発光モジュール。
- 前記波長変換部は、アスペクト比が10~100であることを特徴とする請求項11乃至15のいずれか1項に記載の発光モジュール。
- 前記波長変換部は、多角柱または円柱であることを特徴とする請求項11乃至16のいずれか1項に記載の発光モジュール。
- 前記波長変換部は、単結晶材料またはセラミックス材料で構成されており、前記単結晶材料または前記セラミックス材料の主軸と、前記入射部および前記出射部を結ぶ直線との成す角が±5°以内であることを特徴とする請求項11乃至17のいずれか1項に記載の発光モジュール。
- 光源の光が入射する第1の入射部と、入射した光により励起され、波長変換された第1の色の変換光が出射する第1の出射部とを有する第1の波長変換部と、
光源の光が入射する第2の入射部と、入射した光により励起され、波長変換された第2の色の変換光が出射する第2の出射部とを有する第2の波長変換部と、を備え、
前記第1の波長変換部は、前記第1の入射部から入射した光源の光が前記第1の出射部へ向かう際に散乱する程度が、多結晶材料の場合と比較して小さい材料で構成されており、
前記第2の波長変換部は、前記第2の入射部から入射した光源の光が前記第2の出射部へ向かう際に散乱する程度が、多結晶材料の場合と比較して小さい材料で構成されていることを特徴とする蛍光部材。 - 前記第1の波長変換部は、ロッド状の部材であり、該部材の長手方向の一端に前記第1の入射部が形成されており、該部材の長手方向の他端に前記第1の出射部が形成されており、
前記第2の波長変換部は、ロッド状の部材であり、該部材の長手方向の一端に前記第2の入射部が形成されており、該部材の長手方向の他端に前記第2の出射部が形成されていることを特徴とする請求項19に記載の蛍光部材。 - 前記第1の波長変換部は、筒状部材であり、
前記第2の波長変換部は、前記第1の波長変換部の孔の内部に設けられていることを特徴とする請求項20に記載の蛍光部材。 - 前記第1の波長変換部は、アスペクト比が10以上であり、
前記第2の波長変換部は、アスペクト比が10以上であることを特徴とする請求項20または21に記載の蛍光部材。 - 前記第1の波長変換部は、柱状部材であり、
前記第2の波長変換部は、柱状部材であり、
前記第1の波長変換部および前記第2の波長変換部は、前記第1の出射部と前記第2の入射部とが対向するように配置されていることを特徴とする請求項19に記載の蛍光部材。 - 前記第1の波長変換部は、単結晶材料またはセラミックス材料で構成されており、前記単結晶材料または前記セラミックス材料の主軸と、前記第1の入射部および前記第1の出射部を結ぶ直線との成す角が±5°以内であることを特徴とする請求項19乃至23のいずれか1項に記載の蛍光部材。
- 前記第2の波長変換部は、単結晶材料またはセラミックス材料で構成されており、前記単結晶材料または前記セラミックス材料の主軸と、前記第2の入射部および前記第2の出射部を結ぶ直線との成す角が±5°以内であることを特徴とする請求項19乃至24のいずれか1項に記載の蛍光部材。
- 光源と、
請求項19乃至25のいずれか1項に記載の蛍光部材と、を備え、
前記第1の入射部および前記第2の入射部は、互いに隣接しており、前記光源の発光面と対向するように配置されていることを特徴とする発光モジュール。
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JPWO2017159696A1 (ja) | 2019-01-24 |
JP6821655B2 (ja) | 2021-01-27 |
CN109429533B (zh) | 2021-06-29 |
US11402077B2 (en) | 2022-08-02 |
EP3432370A4 (en) | 2019-11-20 |
US20190032886A1 (en) | 2019-01-31 |
EP3432370B1 (en) | 2021-08-04 |
EP3432370A1 (en) | 2019-01-23 |
CN109429533A (zh) | 2019-03-05 |
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