CN108105604A - Luminescent ceramic structure and preparation method thereof, related lighting fixtures and projection arrangement - Google Patents
Luminescent ceramic structure and preparation method thereof, related lighting fixtures and projection arrangement Download PDFInfo
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- CN108105604A CN108105604A CN201611053227.8A CN201611053227A CN108105604A CN 108105604 A CN108105604 A CN 108105604A CN 201611053227 A CN201611053227 A CN 201611053227A CN 108105604 A CN108105604 A CN 108105604A
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/581—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on aluminium nitride
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/68—Details of reflectors forming part of the light source
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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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
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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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
- F21V29/86—Ceramics or glass
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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
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
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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
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
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Abstract
The invention discloses a kind of luminescent ceramic structure and preparation method thereof, related lighting fixtures and projection arrangements.The luminescent ceramic structure of the present invention, including stacking gradually combined luminescent ceramic layer, porous ceramics reflecting layer and aluminium nitride ceramics heat-radiating substrate；Wherein porous ceramics reflecting layer is doping zinc-oxide and/or the alumina porous ceramic of magnesia, and the zinc oxide and/or magnesia of doping with ceramic heat-dissipating substrate for being combined, and the zinc oxide and/or magnesia that adulterate are at least partly with ZnxAlyO and/or MgxAlyThe form of O exists, to enhance the bonding force with aluminum nitride ceramic substrate.The luminescent ceramic structure of the present invention has the characteristics that thermal conductivity is high, bonding force is strong, reliability is high, can be as related lighting fixtures and the optical device of projection arrangement.
Description
Technical field
The present invention relates to illumination and display technology field, more particularly to a kind of luminescent ceramic structure and preparation method thereof, phases
Close light-emitting device and projection arrangement.
Background technology
Using laser, either the light source activations such as LED fluorescent powder is a kind of extensive to obtain predetermined monochromatic light or polychromatic light
Technical solution applied to fields such as lighting source, Projection Displays.This technical solution is often emitted using laser or LED
Light is incided on high-speed rotating fluorescent powder color wheel, to realize good heat dissipation.
The packaged type of fluorescent powder is mainly that organic silica gel encapsulation and unorganic glass encapsulate two kinds at present, both encapsulation sides
The thermal conductivity of formula is relatively low (1W/ (mK) is below), and heat resistanceheat resistant fail temperature is not high, and the tolerable temperature of silica gel is generally at 200 DEG C
Hereinafter, the tolerable temperature of glass is generally below 500 DEG C.
In order to solve thermal conductivity and temperature resistance problem, those skilled in the art further developed the fluorescence hair of ceramic structure
Photo structure.In the prior art, TW201023405A discloses a kind of light emitting structure, is reflected including luminescent ceramic layer and porous ceramics
Layer, wherein porous ceramics reflecting layer are porous YAG reflecting layer, which make use of the heat resistance of ceramic structure and excellent
The technical solution of mechanical performance, more above-mentioned organic silica gel encapsulation and unorganic glass encapsulation is greatly improved.However the technical side
Case results from LED illumination period, and the light intensity for the exciting light that LED is sent under the irradiation of laser, shines far away from nowadays laser
Ceramic layer sends substantial amounts of heat, and the porous ceramics reflecting layer porous structure of itself causes heat to be difficult to pass, it is necessary at it
The back side sets heat-radiating substrate to improve heat dissipation.
In the prior art, the composition material in porous ceramics reflecting layer is usually different from the composition material of heat-radiating substrate, causes
The two is difficult to enhance with reference to power by way of being sintered jointly.
The content of the invention
To solve technical problem in the prior art, the present invention provides a kind of luminescent ceramic structures, have heat conduction
The characteristics of rate is high, bonding force is strong, reliability is high.
According to the first aspect of the invention, the present invention provides a kind of luminescent ceramic structure, and one is incorporated in including stacking gradually
Luminescent ceramic layer, porous ceramics reflecting layer and the ceramic heat-dissipating substrate risen；Wherein above-mentioned porous ceramics reflecting layer aoxidizes for doping
The alumina porous ceramic of zinc and/or magnesia, the zinc oxide and/or magnesia of doping are used to be combined with ceramic heat-dissipating substrate；
And at least part of the zinc oxide adulterated is with ZnxAlyThe form of O exist and at least part of the magnesia of doping with
MgxAlyThe form of O exists；Above-mentioned ceramic heat-dissipating substrate is aluminum nitride ceramic substrate.
Further, above-mentioned ZnxAlyO is specifically ZnAl2O4, MgxAlyO is specifically MgAl2O4。
Further, above-mentioned porous ceramics reflecting layer also at least one of doped zirconia, titanium oxide and yttrium oxide.
Further, the oxide ratios adulterated in above-mentioned porous ceramics reflecting layer are the 1%~10% of gross mass.
Further, above-mentioned luminescent ceramic layer is Ce doping YAG ceramics.
Further, the thickness of above-mentioned luminescent ceramic layer is 0.05~1mm, and the thickness in above-mentioned porous ceramics reflecting layer is
0.1~2mm, the thickness of above-mentioned ceramic heat-dissipating substrate is 0.5~5mm.
Further, above-mentioned luminescent ceramic layer surface, which is coated with anti-reflection film or luminescent ceramic layer surface, coarse microstructure.
According to the second aspect of the invention, the present invention provides a kind of preparation side of such as luminescent ceramic structure of first aspect
Method, including：The casting slurry for being for respectively forming porous ceramics reflecting layer and luminescent ceramic layer is successively cast in ceramic heat-dissipating
On substrate, above-mentioned luminescent ceramic structure is formed then in turn through lamination and sintering.
According to the third aspect of the invention we, the present invention provides a kind of light-emitting device, the luminescent ceramic knot including first aspect
Structure further includes to generate the excitation light source of exciting light, and above-mentioned luminescent ceramic structure is located in the light path of above-mentioned exciting light.
According to the fourth aspect of the invention, the present invention provides a kind of optical projection system, and the light-emitting device including the third aspect is gone back
Including projection imaging device.
Luminescent ceramic structure provided by the invention, on the one hand, while by the use of alumina porous ceramic as reflecting layer,
Luminescent ceramic layer and ceramic heat-dissipating substrate are bonded together as adhesive linkage, while realizing higher efficiency, reliability higher.Separately
On the one hand, since aluminium oxide reflective ceramic layer is un-densified porous structure, this structure can be in the case of thinner thickness, still
It can ensure there is higher reflectivity, and this un-densified porous structure can realize the inconsistent oxidation of coefficient of thermal expansion
Aluminium ceramics are bonding with aluminium nitride ceramics.Importantly, zinc oxide and/or magnesia are added in alumina porous ceramic,
Chemical reaction generation Zn occurs with the micro-oxidation aluminium layer on aluminum nitride ceramic substrate surface layerxAlyO and/or MgxAlyO further increases
By force with the bonding force of aluminum nitride ceramic substrate.
Description of the drawings
Fig. 1 is the structure diagram of one embodiment of the luminescent ceramic structure of the present invention；
Fig. 2 is the structure diagram of another embodiment of the luminescent ceramic structure of the present invention；
Fig. 3 is the structure diagram of another embodiment of the luminescent ceramic structure of the present invention.
Specific embodiment
The present invention is described in further detail below by specific embodiment combination attached drawing.
In the present invention, luminescent ceramic structure includes stacking gradually combined luminescent ceramic layer (first layer), more
Hole ceramic reflective layer (second layer) and ceramic heat-dissipating substrate (third layer), wherein porous ceramics reflecting layer are aluminum oxide porous pottery
Porcelain, ceramic heat-dissipating substrate are aluminum nitride ceramic substrate.Technical scheme, to improve porous ceramics reflecting layer and aluminium nitride
The combination power of ceramic substrate, oxide is doped in alumina porous ceramic layer.Since the surface of aluminum nitride ceramic substrate holds
One layer of very thin aluminium oxide is also easy to produce, the oxide being entrained in alumina porous ceramic layer can be with the oxidation of aln surface
Aluminium layer reacts, and generates a kind of combination product, so as to improve porous ceramics reflecting layer and ceramic heat-dissipating using the combination product
The combination of substrate.Due to porous ceramics reflecting layer be alumina porous ceramic, the aluminium oxide of itself be difficult to aluminium nitride or
Any reaction occurs for the aluminium oxide of aln surface, therefore the present invention participates in reaction using the oxide of extra implant, becomes more
The connection bridge of hole ceramic reflective layer and ceramic heat-dissipating substrate, this is the main inventive concept of the present invention.
Each layer of luminescent ceramic structure of the present invention is described one by one below.
<Luminescent ceramic layer>
In embodiments of the present invention, the effect of first layer luminescent ceramic layer is the irradiation for receiving exciting light, and will swash
Luminescent conversion is the different stimulated light of wavelength.Here exciting light can be the light that solid state light emitter is sent, such as LED light, laser two
Pole pipe light, laser optical, or disclosed light source light before other any the present patent application.Since luminescent ceramic layer is ceramics
Structure, thermal stability and heat conductivility are the phosphor powder layer of matrix (i.e. by fluorescent powder packaging far superior to using glass or silica gel
In continuous glass or silica gel), the irradiation of high-power exciting light can be born, can be adapted for high brightness laser fluorescence photograph
Bright/display field.
Luminescent ceramic layer can be the fluorescence ceramics of pure phase, can be specifically various oxide ceramics, nitride ceramics or
Nitrogen oxide ceramic by mixing micro activator element (such as lanthanide series) during ceramic system is standby, is formed in shining
The heart.Since the doping of general activator element is smaller (being generally less than 1%), such fluorescence ceramics is typically transparent or semitransparent
Luminescent ceramic, exciting light after the luminescent ceramic layer easily directly through being emitted, therefore the luminous efficiency of the luminescent ceramic layer is not high,
It is more suitable for the exciting light application scenarios of lower-wattage.In an embodiment of the invention, luminescent ceramic layer is Ce doping YAG
Ceramics；In yet another embodiment of the present invention, luminescent ceramic layer adulterates LuAG ceramics for Ce.
Luminescent ceramic layer can also be composite ceramic layer, using transparent/translucent ceramics as matrix, in ceramic substrate
It is dispersed with luminescent ceramic particle (such as fluorescent powder grain).Transparent/translucent ceramic substrate can be various oxide ceramics (such as oxygen
Change aluminium ceramics, Y3Al5O12Ceramics), nitride ceramics (such as aluminium nitride ceramics) or nitrogen oxide ceramic, ceramic substrate act on
It is conducted in light and heat so that exciting light can be incided on luminescent ceramic particle, and enables stimulated light from luminous pottery
It is emitted in enamel coating；Luminescent ceramic particle undertakes the main lighting function of luminescent ceramic layer, for absorbing exciting light and being converted
For stimulated light.The size of microcrystal of luminescent ceramic particle is larger, and the doping of activator element is larger (such as 1~5%) so that
Its luminous efficiency is high；And luminescent ceramic particle is scattered in ceramic substrate, is avoided positioned at luminescent ceramic layer deep place
Luminescent ceramic particle can not be excited the situation that illumination is mapped to, it is thus also avoided that pure phase fluorescence ceramics entirety doping is larger and causes
Activator concentration of element poisoning situation, so as to improve the luminous efficiency of luminescent ceramic layer.
Further, scattering particles can also be increased in above-mentioned luminescent ceramic layer, scattering particles is made to be distributed in ceramic substrate
In.The effect of scattering particles is to enhance scattering of the exciting light in luminescent ceramic layer, so as to increase exciting light in luminescent ceramic
Light path in layer so that the light utilization efficiency of exciting light greatly improves, and improves the light conversion efficiency of luminescent ceramic layer.Scattering particles
Can be scattering particles, such as aluminium oxide, yttrium oxide, zirconium oxide, lanthana, titanium oxide, zinc oxide, barium sulfate etc., either
The scattering particles of homogenous material or two or more combination, feature are apparent white color, can be to visible ray
It is scattered, and material settling out, high temperature can be born, grain size is in the same order of magnitude or a low quantity with excitation wavelength
Grade.In other embodiment, scattering particles may be replaced by the stomata of same size, utilize stomata and ceramic substrate
Refringence realizes total reflection so as to be scattered to exciting light or stimulated light.
Luminescent ceramic layer can also be another composite ceramic layer, the area of the composite ceramic layer and above-mentioned composite ceramic layer
Ceramic substrate difference is not only that.In the present embodiment, ceramic substrate is the fluorescence ceramics of pure phase, i.e. ceramic substrate has in itself
There is activator, stimulated light can be sent under the irradiation of exciting light.The above-mentioned composite ceramic layer of the overall evaluation of a technical project shines
Advantage of the fluorescence ceramics with luminescent properties of advantage and above-mentioned pure phase of the ceramic particle with high-luminous-efficiency, utilizes simultaneously
Luminescent ceramic particle shines with ceramic substrate, further improves the luminous efficiency of luminescent ceramic layer, and the ceramic base
For matter although with certain activator doping, doping is relatively low, can ensure that the ceramic substrate has enough light transmissions
Property.In the luminescent ceramic layer, it can equally increase the scattering-in of scattering particles or stomata enhancing luminescent ceramic layer.
Luminescent ceramic particle typical case but non-limiting selection are that lanthanide-doped Garnet luminescent is ceramic, such as Ca3
(Al,Sc)2Si3O12Or aluminate, such as (Gd, Tb, Y, Lu)3(Al,Ga)5O12And compounding ingredients
Y3Mg2AlSi2O12Refer to that the ratio of Al and Ga can be selected arbitrarily Deng, the element separated in bracket with comma such as (Al, Ga)
It selects, but the two elements total amount is equivalent to 1, such as Al in chemical formula0.7Ga0.3、Al0.9Ga0.1、Al0.2Ga0.8.In the present invention
An embodiment in, preferably Ce doping YAG garnets, i.e. (Y1-xCex)3Al5O12.In another embodiment of the invention
In, luminescent ceramic particle adulterates LuAG garnet structures for Ce.
In an embodiment of the invention, the thickness of luminescent ceramic layer is 0.05~1mm, if luminescent ceramic layer mistake
Thin, efficiency declines；If luminescent ceramic layer is blocked up, thermal resistance is too big, is unfavorable for radiating.
<Porous ceramics reflecting layer>
In embodiments of the present invention, second layer porous ceramics reflecting layer is used for stimulated light or stimulated light with not absorbed
The mixed light of exciting light be scattered reflection.Porous ceramics reflecting layer is specially alumina porous ceramic, and principle of reflection is
Using the refringence of hole and aluminium oxide, make incident light that total reflection occur at the interface of aluminium oxide and hole and realize reflection effect
Fruit.The refractive index of aluminium oxide is generally 1.7 or so, and hole is believed that in it that for air, refractive index is 1 or so, when light is from oxygen
When changing the interface that aluminium oxide and air are incided into inside aluminium, it can be totally reflected in the case of incidence angle is smaller.Pass through control
The size (such as by adding pore creating material or control heating rate in preparation process) and control porous ceramics of stomata reflect
The thickness of layer is the reflectivity in controllable porous ceramics reflecting layer.The alumina porous ceramic high temperature resistant, anti-oxidant of the present invention is fitted
In the luminescent ceramic structure of high-power light-emitting, and stomata is easier to be evenly distributed, and it is equal to be conducive to the reflectivity of reflecting layer everywhere
It is even.A kind of metallic reflector of the prior art is oxidizable, vulcanization, the short life especially in hot environment；Another is existing
White scattering particles are bonded into stratification using the bonding agents such as glass in technology, the defects of technical solution is, in preparation process
In, bonding agent is sticky, and white scattering particles grain size is smaller, easily reunites, it is difficult to be uniformly dispersed, due to the reflection
The reflection function material of layer is white scattering particles, it is impossible to which being uniformly dispersed will cause reflectivity uneven.
In embodiments of the present invention, extra implant oxide in alumina porous ceramic layer, the part oxide can
To react at high temperature with aluminium oxide, new composite oxides are generated, the form of the composite oxides is MxAlyO, wherein M
For the element of the oxide of doping.In an embodiment of the invention, typical feature is：Doped in zinc oxide and magnesia
It is at least one.In the case of doped with zinc oxide, zinc oxide is at least partly with ZnxAlyThe form of O exists, doped with oxidation
In the case of magnesium, magnesia is at least partly with MgxAlyThe form of O exists.The oxide of doping in preparation process with oxidation
Aluminium porous ceramic layer raw material mixing mode mix, in sintering process, the oxide portions of doping with aoxidize reactive aluminum.
Alumina porous ceramic layer is directly fired on ceramic heat-dissipating substrate, and ceramic heat-dissipating substrate is preprepared nitridation
Aluminium ceramic substrate, the surface of the aluminum nitride ceramic substrate would generally be aoxidized and generate one layer of aluminum oxide film, when firing oxygen
When changing aluminium porous ceramic layer, doping oxide (magnesia or zinc oxide i.e. described above) in raw material easily with aluminium nitride ceramics
The aluminum oxide film film reaction of substrate surface, generates composite oxides, which causes alumina porous ceramic layer and nitrogen
Change that aluminium ceramic heat-dissipating substrate is even closer is combined together, so as to improve the reliability of product.
In some embodiments of the invention, ZnxAlyO is specifically ZnAl2O4, MgxAlyO is specifically MgAl2O4, such is multiple
Conjunction oxide be spinel structure, stable structure, beneficial to the combination of porous ceramic layer and ceramic heat-dissipating layer.It can be by detecting oxygen
Change the engaging portion of aluminium porous ceramic layer and aluminium nitride ceramics heat-radiating substrate, carry out constituent analysis characterization to confirm depositing for the substance
.MgAl2O4The diffraction maximum card of X-ray diffraction spectrum be PDF#21-1152, ZnAl2O4X-ray diffraction spectrum diffraction maximum
Card is PDF#05-0669.
Certainly, what deserves to be explained is, Zn of the inventionxAlyO and MgxAlyIn O, the element ratio of Zn and Al or Mg and Al
It is not particularly limited, and in actual luminescent ceramic infrastructure product, element ratio may not be with a fixed value
Occur, but there are many possible compound form, element ratio is variant in different compound forms, marks x and y the bottom of using and anticipates
In any Zinc-aluminium or magnesium aluminum oxide of the price balance for representing to meet compound.For example, composite oxides may also
It is the composite oxides such as Zn of other elements molar ratio2Al2O5Deng again may be by elemental analysis or X-ray diffraction spectrum and confirm
The composite oxides exist.
In another embodiment of the present invention, in addition to doped at least one of zinc oxide and magnesia, also into
Doping in one step has at least one of zirconium oxide, titanium oxide and yttrium oxide, they are all the ceramic powders of high index of refraction, and opposite
The aluminium oxide of low-refraction is combined with beneficial to its reflectivity of raising.In addition, zirconium oxide also has the function of toughening, by adulterating oxygen
The mechanical performance of alumina porous ceramic layer can be improved by changing zirconium.
In embodiments of the present invention, the oxide ratios adulterated in porous ceramics reflecting layer be gross mass 1%~
10%.That is, when the oxide of doping only has at least one of magnesia or zinc oxide, at least the one of the magnesia or zinc oxide
The ratio that the gross mass of kind accounts for porous ceramics reflecting layer is 1%~10%；When the oxide of doping further comprises zirconium oxide, oxygen
When changing at least one of titanium and yttrium oxide, in at least one and zirconium oxide, titanium oxide and yttrium oxide of magnesia or zinc oxide
At least one gross mass account for porous ceramics reflecting layer mass ratio be 1%~10%.What deserves to be explained is 1%~
Represented by 10% is the mass fraction of the oxide adulterated in preparation process, is not lost in the reaction, therefore final
In product, 1%~10% mass fraction not only includes oxide, but also including ZnxAlyO and/or MgxAlyO be converted into oxide it
Mass fraction afterwards is sum of the two.
The ratio of doping oxide is unsuitable too low, otherwise no enough composite oxides will be caused to generate, increasing is not achieved
The effect that strong porous ceramics reflecting layer is combined with ceramic heat-dissipating substrate.Further, since the thermal conductivity of the oxide of doping is relatively low, and
Coefficient of thermal expansion and aluminium oxide have deviation, and excessively high doping can cause thermal conductivity relatively low, can become with the cofiring stability of YAG ceramics
Difference.And 1%~10% doping for being equivalent to gross mass can obtain preferable effect, but the basic embodiment of the present invention is not
It is limited to this mass ratio.
Alumina porous ceramic layer and luminescent ceramic layer are connected by being sintered, form the slurry of alumina porous ceramic layer with
The slurry for forming luminescent ceramic layer is successively coated on heat-radiating substrate, is formed luminescent ceramic layer, alumina porous ceramic layer and is dissipated
The stacked three-decker of hot substrate makes alumina porous ceramic layer be firmly bonded to one with luminescent ceramic layer by sintering
It rises.In addition, alumina porous ceramic layer and luminescent ceramic layer can also be connected after each self-forming by adhesive linkage, adhesive linkage can be with
For glass adhesive linkage, organic bonding layer (such as silica gel, epoxy resin).
One in the present invention is searched in embodiment, and the thickness in porous ceramics reflecting layer is 0.1~2mm, if porous pottery
Porcelain reflecting layer is excessively thin, and reflectivity reduces；If porous ceramics reflecting layer is blocked up, thermal resistance is too big, is unfavorable for radiating.
<Ceramic heat-dissipating substrate>
In embodiments of the present invention, the heat that the effect of third layer ceramic heat-dissipating substrate is to be conducted through reflecting layer dissipates
It is dealt into air or is further dissipated by other radiating pieces.Ceramic heat-dissipating substrate selects aluminum nitride ceramic substrate, is due to nitrogen
Changing aluminium ceramics has excellent heat conductivility, and its mechanical performance is also preferable.
The luminescent ceramic structure of the present invention, due to third layer using aluminum nitride ceramic substrate as heat-radiating substrate, surface
Necessarily have an aluminium oxide after being aoxidized, and in the alumina porous ceramic of the second layer doped in zinc oxide and magnesia at least
One kind so can form Zn in the interface of the second layer and third layerxAlyO and MgxAlyAt least one of O, for combining second
Layer and third layer, so as to improve the combination power between two layers.The description as described in the composite oxides is referred to above-mentioned porous
Description in ceramic reflective layer, details are not described herein again.
In one embodiment of the invention, the thickness of ceramic heat-dissipating substrate is 0.5~5mm.If ceramic heat-dissipating substrate
Excessively thin, then intensity is too low；If ceramic heat-dissipating substrate is blocked up, the overweight and substrate cost of meeting is excessively high.
In other embodiments of the invention, luminescent ceramic layer surface is coated with anti-reflection film, can be specifically plating high index of refraction
Film, the alternate anti-reflection film of low refractive index film multilayer, for further improving incident light transmission rate and improving light extraction efficiency.Or
Luminescent ceramic layer surface has coarse microstructure, can be specifically to go out laciniation in luminescent ceramic layer surface etch, for into
One step improves launching efficiency and light extraction efficiency.
The preparation method of luminescent ceramic structure is additionally provided in an embodiment of the present invention, including：It will be for respectively forming
The casting slurry of porous ceramics reflecting layer and luminescent ceramic layer is successively cast on ceramic heat-dissipating substrate, then in turn through lamination
Luminescent ceramic structure is formed with sintering.
In one embodiment of the invention, with Ce doping YAG (YAG:Ce luminescent ceramic layer) is prepared, with doping zinc-oxide
And/or the aluminium oxide of magnesia prepares porous ceramics reflecting layer, using aluminium nitride ceramics (thermal conductivity is more than 80W/mK) as ceramics
Heat-radiating substrate.First, YAG casting slurries and Woelm Alumina casting slurry are prepared；Then, Woelm Alumina casting slurry is poured
Note dries pouring belt to obtain green sheet on ceramic heat-dissipating substrate；Continue YAG casting slurries being cast in Woelm Alumina life
On sheet material, formed and Woelm Alumina and YAG raw cook layers are stacked on ceramic heat-dissipating substrate；Finally, by being laminated and sintering is sent out
Light ceramic structure finished product.
In the above-described embodiments, since YAG ceramics thermal conductivities are higher (20 DEG C are 14W/m/K, and 100 DEG C are 10.5W/m/K)
And YAG fusing points are very high (1970 DEG C), can greatly improve fluorescent powder packaging radiating efficiency and heat resistanceheat resistant fail temperature, meet high-power
The use of blue-ray LED especially blue laser.
In the above-described embodiments, reflecting layer can be ensured preferably using the porous alumina ceramic with YAG ceramic layer cofirings
Reflectivity, thermal conductivity is also compared with glass ceramics higher, and the mode interface resistance of cofiring is lower.In addition, existed using the tape casting
The luminescent ceramic structure of reflecting ceramic and luminescent ceramic cofiring is made on ceramic heat-dissipating substrate, can realize variously-shaped, such as side
Shape or annulus, and since casting thickness can control, it is thus possible to realize luminescent layer and the controllable structure of reflector thickness, thus
Compared to luminescent ceramic layer is fabricated separately, is then cut, be thinned, being polished, plating reflecting layer, welding reflecting layer to heat-conducting substrate
On production method, technique provided by the invention once sintered can be molded, and technique is simpler, and can realize major diameter
The making of luminescent ceramic structure.Therefore it is a kind of volume production preparation method of low-cost high-efficiency.
The embodiment of the present invention further provides for a kind of light-emitting device, the luminescent ceramic structure including the embodiment of the present invention, also
Excitation light source including being used to generate exciting light, luminescent ceramic structure are located in the light path of exciting light.Luminescent ceramic layer is used to inhale
Exciting light is received to generate stimulated light, porous ceramics reflecting layer is used for the stimulated light or stimulated light and unabsorbed exciting light
Mixed light be scattered reflection, the heat that ceramic heat-dissipating substrate is used to be conducted through reflecting layer distributes.The light-emitting device can
To be applied in general illumination, such as various lamps and lanterns --- street lamp, searchlight, stage lighting, headlight for vehicles can also be applied to aobvious
Show in system, such as projector, television set.The advantage of the light-emitting device is, energy saving (electroluminescent light source LD), highlighted
Degree, long-life.
The embodiment of the present invention further provides for a kind of optical projection system, and the light-emitting device including the embodiment of the present invention further includes
Projection imaging device.After the optical projection system employs above-mentioned light-emitting device, the high-high brightness of emergent light is significantly improved, as low as
Domestic micro projection, parlor projection, greatly to engineering projection, cinema projection, can be competent at.And the raising of brightness is also beneficial to
The raising of contrast ratio of projector.
Below by way of the specific embodiment technical solution that the present invention will be described in detail, it should be understood that these embodiments are only shown
Example property, it is impossible to be interpreted as limiting the scope of the invention.
Embodiment one
As shown in Figure 1, the luminescent ceramic structure of the present embodiment includes：Stack gradually combined luminescent ceramic layer
110th, porous ceramics reflecting layer 120 and ceramic heat-dissipating substrate 130；Wherein luminescent ceramic layer 110 includes fluorescence crystal grain 111 and scattering
Medium 112, porous ceramics reflecting layer 120 includes alumina porous ceramic 122, doped with zinc oxide 121；Ceramic heat-dissipating substrate
130 be aluminum nitride ceramic substrate.During luminescent ceramic structure is prepared, since the surface of aluminum nitride ceramic substrate necessarily has
Aluminium oxide after being aoxidized, and in porous ceramics reflecting layer 120 Zn can be so formed doped with zinc oxidexAlyO, so as to carry
High combination power between porous ceramics reflecting layer 120 and ceramic heat-dissipating substrate 130.
The luminescent ceramic structure of the present embodiment is prepared using the tape casting, specifically may include steps of：
The preparation of 1.YAG casting slurries：First by synthesis material yttrium oxide, aluminium oxide, cerium oxide and fluxing agent TEOS (just
Silester) it mixes in addition alcohol solvent, then with alumina balls ball milling for a period of time.The ball milling slurry is glued with polymer
Agent and plasticizer mixing are tied, polymeric binder such as, but not limited to polyvinyl butyral (PVB), plasticizer is such as but unlimited
In benzyl butyl phthalate (BBP), polyethylene glycol (PEG).Binding agent and plasticizer can be directly added into and mixed with slurry or
In a solvent then dissolving is added in slurry in advance.
2. the preparation of Woelm Alumina casting slurry：First by synthesis material aluminium oxide, the zinc oxide of doping and pore-creating
Agent mixing is added in alcohol solvent, and pore creating material can be starch or PMMA microsphere (polymethyl methacrylate), then with oxidation
Aluminium ball ball milling is for a period of time.The ball milling slurry is mixed with polymeric binder and plasticizer, polymeric binder is such as but not
It is limited to polyvinyl butyral (PVB), plasticizer such as, but not limited to benzyl butyl phthalate (BBP), polyethylene glycol
(PEG).Binding agent and plasticizer can be directly added into and be mixed with slurry or dissolve and then add in slurry in a solvent in advance.
3. cast：Woelm Alumina casting slurry with proper viscosity is cast in nitridation with the scraping blade with adjustable clearance
On aluminium ceramic substrate.The thickness of pouring belt is adjusted by scraping blade gap, slurry viscosity and teeming rate.In air or oxygen atmosphere
Under, the dry pouring belt can be heated or not heated matrix in the process.After pouring belt evaporates solvent and pore creating material, obtain
The green sheet of different-thickness.Continue YAG casting slurries being cast in Woelm Alumina green sheet with the scraping blade with adjustable clearance
On, it is formed and Woelm Alumina and YAG raw cook layers is stacked on heat-conducting substrate.
4. lamination：The stacking of pouring belt is placed in made of the metal of such as stainless steel between metal die, and heating is poured
Note band is stacked on the Tg temperature (glass transition temperature) of binding agent, is then carried out uniaxial compression, is discharged pressure afterwards.The process
In, the pattern such as hole, column or rough surface on green sheet in lamination using the mold with layout by being formed in
On green sheet.This pattern can improve optical coupling and reduce lateral light propagation by waveguiding effect, so as to promote light output side
Upward light extraction.
5. sintering：Green sheet is heated in air to decompose organic component, such as binding agent, plasticizer.Remove binding agent it
Afterwards, green sheet is in vacuum, H2/N2、H2And/or Ar/H2In atmosphere, at 1200 DEG C to 1900 DEG C, preferably 1500 DEG C to 1800 DEG C,
Be sintered within the temperature range of more preferable 1600 DEG C to 1700 DEG C, and continue 1 hour to 100 it is small when, preferably 2 to 10 it is small when.Removing
Binding agent and sintering circuit can be carried out independently or carried out together.The formation of the defects of due to Lacking oxygen is sintered under reducing atmosphere
Lamination green sheet usual color is brown during sintering or dark brown.It is generally necessary to be carried out under air or oxygen atmosphere
It reoxidizes, to make ceramic sheet material that there is higher photoluminescence efficiency in visible wavelength range.
Embodiment two
The basic composition of the luminescent ceramic structure of the present embodiment is identical with embodiment one, and unique difference is：Aluminium oxide
Doped with magnesia in porous ceramics, instead of zinc oxide.
Embodiment three
The basic composition of the luminescent ceramic structure of the present embodiment is identical with embodiment one, and unique difference is：Aluminium oxide
Doped with magnesia and zinc oxide in porous ceramics.
Through analysis, the present embodiment has ZnAl between porous ceramics reflecting layer 120 and ceramic heat-dissipating substrate 1302O4With
MgAl2O4Generation.
Example IV
The basic composition of the luminescent ceramic structure of the present embodiment is identical with embodiment one, and unique difference is：Porous pottery
In porcelain reflecting layer 120, further doped zirconia and yttrium oxide on the basis of doping zinc-oxide and/or magnesia.
Embodiment five
As shown in Fig. 2, the basic composition of the luminescent ceramic structure of the present embodiment is identical with embodiment one, unique difference exists
In：The alternate anti-reflection film 140 of high refractive index film, low refractive index film multilayer is coated on luminescent ceramic layer 110, further to carry
High blue light transmitance and raising light extraction efficiency.
Embodiment six
As shown in figure 3, the basic composition of the luminescent ceramic structure of the present embodiment is identical with embodiment one, unique difference exists
In：Laciniation 150 is etched on luminescent ceramic layer 110, to further improve light extraction efficiency.
The above content is combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, do not taking off
On the premise of from present inventive concept, several simple deduction or replace can also be made, should all be considered as belonging to the protection of the present invention
Scope.
Claims (10)
1. a kind of luminescent ceramic structure, which is characterized in that including stacking gradually combined luminescent ceramic layer, porous ceramics
Reflecting layer and ceramic heat-dissipating substrate；Wherein described porous ceramics reflecting layer is more for the aluminium oxide of doping zinc-oxide and/or magnesia
Hole ceramics, the zinc oxide and/or magnesia of doping are used to be combined with the ceramic heat-dissipating substrate；And the zinc oxide adulterated is extremely
Small part is with ZnxAlyThe form of O exists and at least part of the magnesia of doping is with MgxAlyThe form of O exists；The pottery
Porcelain heat-radiating substrate is aluminum nitride ceramic substrate.
2. luminescent ceramic structure according to claim 1, which is characterized in that the ZnxAlyO is specifically ZnAl2O4,
MgxAlyO is specifically MgAl2O4。
3. luminescent ceramic structure according to claim 1, which is characterized in that also adulterate oxidation in the porous ceramics reflecting layer
At least one of zirconium, titanium oxide and yttrium oxide.
4. luminescent ceramic structure according to claim 1, which is characterized in that the oxygen adulterated in the porous ceramics reflecting layer
Compound ratio is the 1%~10% of gross mass.
5. luminescent ceramic structure according to claim 1, which is characterized in that the luminescent ceramic layer is Ce doping YAG potteries
Porcelain.
6. according to claim 1-5 any one of them luminescent ceramic structures, which is characterized in that the thickness of the luminescent ceramic layer
For 0.05~1mm, the thickness in the porous ceramics reflecting layer is 0.1~2mm, the thickness of the ceramic heat-dissipating substrate for 0.5~
5mm。
7. luminescent ceramic structure according to claim 1, which is characterized in that the luminescent ceramic layer surface is coated with anti-reflection
Film or the luminescent ceramic layer surface have coarse microstructure.
It is 8. a kind of such as the preparation method of claim 1-7 any one of them luminescent ceramic structures, which is characterized in that the method
Including：The casting slurry for being for respectively forming porous ceramics reflecting layer and luminescent ceramic layer is successively cast in ceramic heat-dissipating substrate
On, form the luminescent ceramic structure then in turn through lamination and sintering.
9. a kind of light-emitting device, which is characterized in that including claim 1-7 any one of them luminescent ceramic structures, further include
For generating the excitation light source of exciting light, the luminescent ceramic structure is located in the light path of the exciting light.
10. a kind of optical projection system, which is characterized in that including the light-emitting device described in claim 9, further include projection imaging dress
It puts.
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| CN201611053227.8A CN108105604B (en) | 2016-11-25 | 2016-11-25 | Luminescent ceramic structure, preparation method thereof, related light-emitting device and projection device |
| PCT/CN2017/109330 WO2018095211A1 (en) | 2016-11-25 | 2017-11-03 | Luminescent ceramic structure and preparation method therefor, and related light-emitting device and projecting device |
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| CN201611053227.8A CN108105604B (en) | 2016-11-25 | 2016-11-25 | Luminescent ceramic structure, preparation method thereof, related light-emitting device and projection device |
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| CN108105604B (en) | 2020-05-29 |
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