CN102237477A - Multilayer stack-packaged light- emitting diode - Google Patents
Multilayer stack-packaged light- emitting diode Download PDFInfo
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- CN102237477A CN102237477A CN2010101711587A CN201010171158A CN102237477A CN 102237477 A CN102237477 A CN 102237477A CN 2010101711587 A CN2010101711587 A CN 2010101711587A CN 201010171158 A CN201010171158 A CN 201010171158A CN 102237477 A CN102237477 A CN 102237477A
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Abstract
The invention discloses a multilayer stack-packaged light emitting diode (LED). The multilayer stack-packaged LED comprises an LED chip, a first fluorescent powder layer, a first optical band-pass filter layer and a second fluorescent powder layer, wherein the LED chip produces LED light; the first fluorescent powder layer, the first optical band-pass filter layer and the second fluorescent powder layer are stacked on the LED chip sequentially; the first fluorescent powder layer and the second fluorescent powder layer are provided with first fluorescent powder and second fluorescent powder; the first fluorescent powder and the second fluorescent powder are excited by the LED light to produce first excitation light and second excitation light; the first optical band-pass filter layer makes the LED light and the first excitation light pass through and reflects the second excitation light; the wavelength of the LED light is shorter than that of the second excitation light; and the wavelength of the second excitation light is shorter than that of the first excitation light. Therefore, the multilayer stack-packaged LED can improve the luminous efficiency.
Description
Technical field
The present invention is about a kind of light-emitting diode, particularly a kind of light-emitting diode of multilayer storehouse encapsulation.
Background technology
Along with the lifting of the luminous efficiency of white light emitting diode (LED, Light Emitting Diode), white light LEDs has become the new generation light source of extremely paying attention to.The present 100lm/W that the luminous efficiency of white light LEDs can be from the 249lm/W (every watt lumen number) of experiment level to commercial application layer.And its luminous efficiency is still carried in continuous the raising.
Though the luminous efficiency of white light LEDs promotes, if make its color rendering can reach commercial application level, then must sacrifice its luminous efficiency.Color rendering can reach 90% white light LEDs at present, and its luminous efficiency only has 60lm/W approximately.
The relevant patent of white light LEDs is found in TaiWan, China and announces the I276238 patent.This patent is a kind of white light emitting diode assembly that is used for launching a white light.It comprises light-emitting diode chip for backlight unit, one first fluorescent material and one second fluorescent material that is used for launching an exciting light.This first, and this second fluorescent material exciting light that can absorb this light-emitting diode chip for backlight unit respectively and sent in have respectively first, and second exciting light, and inspire one first according to this, and one second emission light.The second emission light that the first emission light that the exciting light that this light-emitting diode chip for backlight unit is launched and this first fluorescent material are inspired and this second fluorescent material are inspired is mixed into this white light.
TaiWan, China is announced the I296696 patent relevant for the flat luminous source of a kind of high color rendering of adjustable color temperature, but it is mainly on the basic light source surface of excitated fluorescent powder luminescence generated by light effect, form transparent area and applying area respectively, on applying area, be coated with the fluorescent material block that to be excited to send the different colors coloured silk, utilize transparent area to wear the light source of penetrating, mixing is via different wavelengths of light that the fluorescent material block sent and produce white light, simultaneously shape or the size with the fluorescent material block can be used to adjust the saturation and the colour temperature of white light color, and light source possessed high color rendering is arranged.
TaiWan, China is announced the I297383 patent makes it reach the method for better color rendering relevant for a kind of with the optical excitation flourescent sheet, mainly utilize ultraviolet light (UV, Ultra Violet) red, green, the blue flourescent sheet that stacks in regular turn of irradiation, make its color rendering better, reach 90%, more approach sunlight, and flourescent sheet also can directly be coated with three layers of color fluorescent material or the coating of direct three blend of colors.
Above-mentioned patented technology utilizes a kind of LED light to excite different fluorescent material mixed light and produce white light in addition again, and is not good because of its fluorescent material stimulation effect though this technology can produce white light, makes that luminous efficiency is half of general white light LEDs.
Summary of the invention
Based on the problems referred to above, the present invention proposes the light-emitting diode of a kind of multilayer storehouse encapsulation, this LED can eliminate secondary excitation phenomenon between multiple fluorescent material, avoid the luminous efficiency that the secondary excitation phenomenon caused loss, and reduce the loss that absorbs conversion.
According to an embodiment, a kind of light-emitting diode of multilayer storehouse encapsulation comprises light-emitting diode (LED, Light Emitting Diode) chip, first phosphor powder layer, the first optical band pass filter layer, reaches second phosphor powder layer.When being driven, led chip produces LED light.First phosphor powder layer is disposed on the led chip and has a plurality of first fluorescent material.First fluorescent material is produced first exciting light by the LED optical excitation.The first optical band pass filter layer is disposed on first phosphor powder layer and makes LED light and first exciting light passes through.Second phosphor powder layer is disposed on the first optical band pass filter layer and has a plurality of second fluorescent material.Second fluorescent material is produced second exciting light by the LED optical excitation.Wherein, second excite light wavelength to be shorter than first to excite light wavelength.
According to an embodiment, the first optical band pass filter layer reflects second exciting light.The LED light wavelength is shorter than second and excites light wavelength.
According to an embodiment, the centre wavelength of aforementioned LED light can be between 430nm (nanometer) to 500nm.The centre wavelength of first exciting light can be between 610nm to 780nm.The centre wavelength of second exciting light can be between 540nm to 560nm.
According to another embodiment, the light-emitting diode of multilayer storehouse encapsulation comprises the second optical band pass filter layer in addition, reaches the 3rd phosphor powder layer.The second optical band pass filter layer is disposed on second phosphor powder layer and LED light, first exciting light and second exciting light is passed through.The 3rd phosphor powder layer is disposed on the second optical band pass filter layer and has a plurality of the 3rd fluorescent material.The 3rd fluorescent material is produced the 3rd exciting light by the LED optical excitation.The 3rd excites light wavelength to be shorter than second excites light wavelength.
According to another embodiment, the second optical band pass filter layer reflects the 3rd exciting light.
According to another embodiment, the centre wavelength of LED light can be between 430nm to 500nm.The centre wavelength of first exciting light can be between 610nm to 780nm.The centre wavelength of second exciting light can be between 555nm to 580nm.The centre wavelength of the 3rd exciting light can be between 540nm to 555nm.
Aforementioned first phosphor powder layer, second phosphor powder layer, and the thickness of the 3rd phosphor powder layer respectively can be between 100 microns and 300 microns.
According to yet another embodiment of the invention, the light-emitting diode of multilayer storehouse encapsulation comprises led chip, first phosphor powder layer, reaches second phosphor powder layer.When being driven, LED produces LED light.First phosphor powder layer is disposed on the led chip and has a plurality of first fluorescent material.First fluorescent material is produced first exciting light by the LED optical excitation.Second phosphor powder layer is disposed on first phosphor powder layer and has a plurality of second fluorescent material.Second fluorescent material is produced second exciting light by the LED optical excitation.The LED light wavelength is shorter than second and excites light wavelength.Second excites light wavelength to be shorter than first excites light wavelength.
According to another embodiment, the refractive index of second phosphor powder layer is higher than the refractive index of first phosphor powder layer.
According to yet another embodiment of the invention, a kind of light-emitting diode of multilayer storehouse encapsulation comprises:
One light-emitting diode chip for backlight unit produces a LED light when being driven; One first optical band pass filter layer is disposed on this led chip and this LED light is passed through; And one first phosphor powder layer, being disposed on this first optical band pass filter layer and having a plurality of first fluorescent material, this first fluorescent material is produced one first exciting light by this LED optical excitation, and this first optical band pass filter layer reflects this first exciting light.
Wavelength by above-mentioned each phosphor powder layer designs according to its relation of repeatedly putting, add optical band pass filter layer each wavelength is filtered and the collocation of reflecting, making that the exciting light that ejects from phosphor powder layer is unlikely is absorbed by other phosphor powder layer again, eliminate the loss of secondary excitation, obtain better luminous efficiency.Secondly, after the LED light wavelength of sending via the excitation wavelength and the LED of suitable each phosphor powder layer of allotment, can obtain the high mixed light of a color rendering.
Relevant characteristics and implementation of the present invention cooperate diagram and embodiment to be described as follows now.
Description of drawings
Fig. 1 is the generalized section according to light-emitting diode first embodiment of multilayer storehouse encapsulation of the present invention;
Fig. 2 A and Fig. 2 B are according to light-emitting diode first embodiment of multilayer storehouse encapsulation of the present invention and the structural representation of control group;
Fig. 2 C is the spectrogram of Fig. 2 A and Fig. 2 B;
Fig. 3 is the generalized section according to light-emitting diode second embodiment of multilayer storehouse encapsulation of the present invention;
Fig. 4 is the generalized section according to light-emitting diode the 3rd embodiment of multilayer storehouse encapsulation of the present invention;
Fig. 5 is the generalized section according to light-emitting diode the 4th embodiment of multilayer storehouse encapsulation of the present invention;
Fig. 6 is the generalized section according to light-emitting diode the 5th embodiment of multilayer storehouse encapsulation of the present invention;
Fig. 7 is the generalized section according to light-emitting diode the 6th embodiment of multilayer storehouse encapsulation of the present invention.
Wherein, Reference numeral:
20,20a, 20b led chip
22a, 22b, 22c, 22d LED light
30 packaging bodies
32 exiting surfaces
The oblique side of 34a, 34b
40 first phosphor powder layers
42a, 42b first fluorescent material
44a, 44b, 44a ' first exciting light
50 first optical band pass filter layers
60 second phosphor powder layers
62a, 62b second fluorescent material
64a, 64b second exciting light
70 second optical band pass filter layers
80 the 3rd phosphor powder layers
82a, 82b the 3rd fluorescent material 90 substrates
92 encapsulation material 94a, 94b pin
Embodiment
First embodiment
At first, see also Fig. 1.Fig. 1 is the generalized section according to the light-emitting diode (LED, Light Emitting Diode) of multilayer storehouse encapsulation of the present invention.Can see from figure and know that multilayer storehouse packaged LED comprises led chip 20, packaging body 30, first phosphor powder layer 40, the first optical band pass filter layer 50, reaches second phosphor powder layer 60.
Led chip 20 is produced LED light 22a, 22b, 22c, 22d (representing with fine line among the figure) when being driven. LED light 22a, 22b, 22c, the 22d that this led chip 20 produced can be ultraviolet light (Ultra Violet), blue light or green glow etc.After the wavelength of this LED light 22a, 22b, 22c, 22d can arrange in pairs or groups with the corresponding wavelength of first phosphor powder layer 40, the first optical band pass filter layer 50, second phosphor powder layer 60 and mix, its mixed light can be but be not limited to white light.
First phosphor powder layer 40 is disposed on the exiting surface 32 and has a plurality of first fluorescent material 42a, 42b.In other words, packaging body 30 is folded between the led chip 20 and first phosphor powder layer 40.The first fluorescent material 42a, 42b are excited by LED light 22b and produce the first exciting light 44a, 44b (representing with small center's line among the figure).Can see that from figure partial L ED light 22a, 22c directly pass first phosphor powder layer 40, not excite the first fluorescent material 42a, 42b.
The first optical band pass filter layer 50 is disposed on first phosphor powder layer 40 and LED light 22a, 22b, 22c, 22d and the first exciting light 44a, 44b is passed through.The first optical band pass filter layer 50 can be but be not limited to make at corresponding LED light 22a, 22b, and 22c, the 22d and the first exciting light 44a, the light of the spectrum of 44b passes through, and allows the light of all the other spectrum be reflected.
Second phosphor powder layer 60 is disposed on the first optical band pass filter layer 50 and has a plurality of second fluorescent material 62a, 62b.The second fluorescent material 62a, 62b by LED light 22a, 22b, 22c, 22d excites and produce the second exciting light 64a, 64b (representing with fine dotted line among the figure).The first optical band pass filter layer, 50 the reflection second exciting light 64a, 64b.
In general, the fluorescent material in the phosphor powder layer can absorb short wavelength's light, and inspires long wavelength's light.In the present invention, the wavelength of LED light 22a, 22b, 22c, 22d is shorter than the wavelength of the second exciting light 64a, 64b.The wavelength of the second exciting light 64a, 64b is shorter than the wavelength of the first exciting light 44a, 44b.That is to say that the wavelength of LED light 22a, 22b, 22c, 22d is for the shortest.
The centre wavelength of aforementioned LED light 22a, 22b, 22c, 22d can for example be the blue light of 465nm between 430nm (nanometer) to 500nm.The centre wavelength of the first exciting light 44a, 44b can for example be the ruddiness of 650nm, so can select the red first fluorescent material 42a, 42b between 610nm to 780nm.The centre wavelength of the second exciting light 64a, 64b can for example be the green glow of 550nm, so can select the green second fluorescent material 62a, 62b between 540nm to 560nm.
As seen from the above description, the LED light 22a that produced of led chip 20,22b, 22c, 22d penetrate towards exiting surface 32.Wherein, LED light 22a does not touch the first fluorescent material 42a, 42b and the second fluorescent material 62a, 62b, and directly penetrates from second phosphor powder layer 60.
Wherein, LED light 22b then touches the first fluorescent material 42a, therefore excites to produce the first exciting light 44a, 44b.Wherein, the first exciting light 44b passes the first optical band pass filter layer 50 and second phosphor powder layer 60 in regular turn, does not contact with the second fluorescent material 62a, 62b.And the first exciting light 44a is after passing the first optical band pass filter layer 50, and 60 places have contacted the second fluorescent material 62b at second phosphor powder layer.Because the wavelength of the first exciting light 44a, 44b is longer than the second exciting light 64a that the second fluorescent material 62a, 62b can excite, the wavelength of 64b.Therefore, this first exciting light 44a only is scattering into 44a ' (first exciting light) because of the second fluorescent material 62b.This first exciting light 44a does not make the second fluorescent material 62b be excited to produce the second exciting light 64a, 64b because of the second fluorescent material 62b changes wavelength yet.
Wherein, LED light 22c has passed first phosphor powder layer 40 and the first optical band pass filter layer 50.And LED light 22c has contacted the second fluorescent material 62a at second phosphor powder layer 60.Because the wavelength of LED light 22c is shorter than the second exciting light 64a that the second fluorescent material 62a can excite, the wavelength of 64b, so LED light 22c makes the second fluorescent material 62a be inspired the second exciting light 64a, 64b.Wherein the second exciting light 64a directly penetrates second phosphor powder layer 60.The second exciting light 64b penetrates second phosphor powder layer 60 just now via the reflection of the first optical band pass filter layer 50.
From foregoing description, can know, can allow LED light 22a, 22b, 22c, 22d and the first exciting light 44a, 44b pass through by the first optical band pass filter layer 50, and allow the characteristic of the second exciting light 64a, 64b reflection, can avoid the second exciting light 64a, 64b to get back to first phosphor powder layer 40 and cause the phenomenon of secondary excitation.Secondly, can allow excite the light of finishing to penetrate second phosphor powder layer 60, increase light extraction efficiency with short path.Moreover, the second exciting light 64a that is excited less than second fluorescent material 62a, the 62b in second phosphor powder layer 60 by the wavelength of LED light 22a, 22b, 22c, 22d, the wavelength of 64b, and the design of the wavelength of the first exciting light 44a, 44b that the wavelength of the second exciting light 64a, 64b is excited less than first fluorescent material 42a, the 42b in first phosphor powder layer 40, make finished the first exciting light 44a, the 44b that excite not reason touch the second fluorescent material 62a, 62b and produce secondary excitation.This design also can improve its light extraction efficiency.
Therefore, the light that penetrates from second phosphor powder layer 60 has promptly comprised LED light 22a, 22b, 22c, 22d, the first exciting light 44a, 44a ', 44b and the second exciting light 64a, 64b.Wavelength by above-mentioned LED light 22a, 22b, 22c, 22d, the first exciting light 44a, 44b and the second exciting light 64a, 64b is chosen as blue light, ruddiness and green glow in regular turn.Therefore, the light that penetrates from second phosphor powder layer 60 can obtain white light after mixing.
According to the structure of first embodiment, can suitably adjust the quantity of thickness and the first fluorescent material 42a, 42b and the second fluorescent material 62a, the 62b of first phosphor powder layer 40 and second phosphor powder layer 60, to adjust the spectrum of mixed light.The thickness of first phosphor powder layer 40 and second phosphor powder layer 60 can be between between 100 microns (um) and 300 microns.
Though the led chip 20 that aforementioned packed body 30 is coated is only represented with a led chip 20 in Fig. 1, not as limit.Also can in packaging body 30, dispose a plurality of led chips 20.
In this embodiment, though the light-emitting diode of multilayer storehouse encapsulation comprises packaging body 30, not as limit.The light-emitting diode of multilayer storehouse encapsulation also can not comprise packaging body 30.Meaning i.e. first phosphor powder layer 40 can directly be configured on the led chip 20.Thus, LED light 22d can directly enter first phosphor powder layer 40, to reduce the light loss that LED light 22d passes packaging body 30.
The experimental verification of first embodiment
Control group experimental verification about multilayer storehouse packaged LED first embodiment sees also Fig. 2 A, reaches Fig. 2 B.Fig. 2 A and Fig. 2 B are according to light-emitting diode first embodiment of multilayer storehouse encapsulation and the structural representation of control group.
Can see that from Fig. 2 A knowing multilayer storehouse packaged LED is configured on the substrate 90.Substrate 90 packed materials 92 coat, and only have an accommodation space that is bowl cup-shaped in encapsulation material 92 central authorities.Multilayer storehouse packaged LED then is configured in this accommodation space.Encapsulation material 92 can be but be not limited to be a high molecular polymer, plastics.Substrate 90 both sides dispose pin 94a, 94b, in order to electrically connect led chip 20.By pin 94a, 94b, can impose an electric current or pulse width modulation (PWM, Pulse WidthModulation) signal gives led chip 20 by the external world, cause led chip 20 luminous.
Multilayer storehouse packaged LED in Fig. 2 A has comprised led chip 20, first phosphor powder layer 40, has reached second phosphor powder layer 60.Wherein, first phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.Second phosphor powder layer 60 has a plurality of second fluorescent material 62a, 62b.The multilayer storehouse packaged LED that the dissimilarity of the multilayer storehouse packaged LED among Fig. 2 A and Fig. 1 comprises Fig. 2 A does not have the first optical band pass filter layer 50.The multilayer storehouse packaged LED of Fig. 2 A is reached the function of the similar first optical band pass filter layer 50 with the principle of total reflection.Anticipate promptly, the refractive index of first phosphor powder layer 40 of Fig. 2 A is less than the refractive index of second phosphor powder layer 60.Therefore, when light from second phosphor powder layer 60 when first phosphor powder layer 40 is advanced, if this incidence angle of light in the angle of total reflection time, will be reflected, and can not penetrate.
The refractive index of second phosphor powder layer 60 in Fig. 2 A is 1.76, and the refractive index of first phosphor powder layer 40 is 1.46.According to the law of refraction, its critical angle is about 56 degree.The first fluorescent material 42a among Fig. 2 A, 42b is a red fluorescence powder.The second fluorescent material 62a, 62b among Fig. 2 A are green emitting phosphor.And the LED light that led chip 20 is sent is blue light.
The structure of the control group of Fig. 2 B and material and Fig. 2 A are roughly the same, and only Fig. 2 B is mixed in the first fluorescent material 42a, 42b and the second fluorescent material 62a, 62b in the single phosphor powder layer.
Then, see also Fig. 2 C, Fig. 2 C is the experimental verification spectrogram relatively of Fig. 2 A and Fig. 2 B.Trunnion axis in this spectrogram is a wavelength.Unit is nanometer (nm).The value of hanging down axle is a luminous intensity, and unit is μ W (microwatt).Curve among the figure shown in the solid line is the spectrogram of Fig. 2 A.Curve among the figure shown in the dotted line is the spectrogram of Fig. 2 B.As can be seen, the solid line luminous intensity from 430nm to 570nm is all greater than the luminous intensity of dotted line approximately from Fig. 2 C.This part has just in time been reacted the lifting of the luminous efficiency that Fig. 2 A total reflection designing institute brings.That is in Fig. 2 A embodiment, the green glow (second exciting light) that is excited by the second fluorescent material 62a, 62b is because of the restriction of total reflection, and a small amount of light penetration first fluorescence coating 40 that goes back is only arranged, and most green glow all penetrates ejaculation from second phosphor powder layer 60.
Moreover based on the effect of above-mentioned total reflection, for the luminous efficacy of the multilayer storehouse packaged LED that makes first embodiment promotes again, the refractive index of first phosphor powder layer 40 can be designed to the refractive index greater than packaging body 30.Thus, can make the more first exciting light 44a, 44b advances towards the first optical band pass filter layer 50.
Second embodiment
Then, see also Fig. 3.Fig. 3 is the generalized section according to light-emitting diode second embodiment of multilayer storehouse encapsulation of the present invention.Can learn that from figure multilayer storehouse packaged LED comprises a plurality of led chip 20a, 20b, packaging body 30, first phosphor powder layer 40, the first optical band pass filter layer 50, second phosphor powder layer 60, the second optical band pass filter layer 70 and the 3rd phosphor powder layer 80.
Led chip 20a, when being driven, 20b produced LED light (label of LED light, first exciting light, second exciting light is identical with Fig. 1, and too complexity and article are too tediously long for fear of accompanying drawing, so no longer indicate) in second and third embodiment and follow-up explanation.Though led chip 20a, 20b in this embodiment in two modes for it, not as limit, can only dispose a led chip or the led chip more than two.
First phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.Second phosphor powder layer 60 has a plurality of second fluorescent material 62a, 62b.The 3rd phosphor powder layer 80 has a plurality of the 3rd fluorescent material 82a, 82b.As the first fluorescent material 42a, when 42b is excited, can produce first exciting light.As the second fluorescent material 62a, when 62b is excited, can produce second exciting light.As the 3rd fluorescent material 82a, when 82b is excited, can produce the 3rd exciting light.The thickness of first phosphor powder layer 40, second phosphor powder layer 60 and the 3rd phosphor powder layer 80 can be between between 100 microns (um) and 300 microns.
The first optical band pass filter layer 50 passes through for the LED light and first exciting light, and allows second exciting light be reflected.70 of the second optical band pass filter layers allow LED light, first exciting light and second exciting light pass through, and the 3rd exciting light is reflected.Thus, can make second exciting light be unlikely and incide first phosphor powder layer 40 and the generation secondary excitation.Also can make the 3rd exciting light be unlikely to incide second phosphor powder layer 60 or first phosphor powder layer 40 and produce secondary excitation.
Certainly, the first optical band pass filter layer 50 also can allow the 3rd exciting light be reflected, but because of second embodiment disposes the second optical band pass filter layer 70, so the 3rd exciting light should have only and can pass second phosphor powder layer 60 on a small quantity and arrive the first optical band pass filter layer 50.Wherein, the LED light wavelength is shorter than the 3rd and excites light wavelength.The 3rd excites light wavelength to be shorter than second excites light wavelength.Second excites light wavelength to be shorter than first excites light wavelength.That is to say that the LED light wavelength is for the shortest, first excites light wavelength for the longest.
For the white light that can obtain mixing, the centre wavelength of LED light can for example be the blue light of 465nm between 430nm to 500nm.The centre wavelength of first exciting light can for example be the ruddiness of 650nm between 610nm to 780nm.The centre wavelength of second exciting light can for example be the gold-tinted of 560nm between 555nm to 580nm.The centre wavelength of the 3rd exciting light can for example be the green glow of 550nm between 540nm to 555nm.
In addition, the wavelength of each assembly can also be adjusted to some extent.Such as but not limited to: the centre wavelength of LED light can be between 320nm to 380nm.It for example is the ultraviolet light of 365nm.The centre wavelength of first exciting light can for example be the ruddiness of 650nm between 610nm to 780nm.The centre wavelength of second exciting light can for example be the green glow of 550nm between 530nm to 560nm.The centre wavelength of the 3rd exciting light can for example be the blue light of 465nm between 380nm to 500nm.
The 3rd embodiment
Moreover, please refer to Fig. 4.Fig. 4 is the generalized section according to light-emitting diode the 3rd embodiment of multilayer storehouse encapsulation of the present invention.As can be seen, multilayer storehouse packaged LED comprises led chip 20a, 20b, packaging body 30, first phosphor powder layer 40, second phosphor powder layer 60 and the 3rd phosphor powder layer 80 among the figure.
First phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.Second phosphor powder layer 60 has a plurality of second fluorescent material 62a, 62b.The 3rd phosphor powder layer 80 has a plurality of the 3rd fluorescent material 82a, 82b.As the first fluorescent material 42a, when 42b is excited, can produce first exciting light.The second fluorescent material 62a, when 62b is excited, can produce second exciting light.The 3rd fluorescent material 82a, when 82b is excited, can produce the 3rd exciting light.
Wherein, the refractive index of the 3rd phosphor powder layer 80 is higher than the refractive index of second phosphor powder layer 60.The refractive index of second phosphor powder layer 60 is higher than the refractive index of first phosphor powder layer 40.Thus, can make more the 3rd exciting light by the boundary reflection of second phosphor powder layer 60 and the 3rd phosphor powder layer 80.More second exciting light is by the boundary reflection of second phosphor powder layer 60 and first phosphor powder layer 40.The configuration of this refractive index can increase light extraction efficiency.
The 4th embodiment
Continuous, please refer to Fig. 5.Fig. 5 is the generalized section according to light-emitting diode the 4th embodiment of multilayer storehouse encapsulation of the present invention.As can be seen, multilayer storehouse packaged LED is configured in substrate 90 and the reflector that constituted of encapsulation material 92 among the figure.Multilayer storehouse packaged LED comprises led chip 20, first phosphor powder layer 40, reaches second phosphor powder layer 60.First phosphor powder layer 40 is disposed on the led chip 20.Second phosphor powder layer 60 is disposed on first phosphor powder layer 40.
First phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.Second phosphor powder layer 60 has a plurality of second fluorescent material 62a, 62b.The first fluorescent material 42a, when 42b is excited, can produce first exciting light.The second fluorescent material 62a, when 62b is excited, can produce second exciting light.
The refractive index of second phosphor powder layer 60 is higher than the refractive index of first phosphor powder layer 40.Therefore, when light carries out towards first phosphor powder layer, 40 row from second phosphor powder layer 60, drop on the interior words of the angle of total reflection if be incident in the incidence angle at first and second phosphor powder layer 40,60 interfaces, this incident ray will be folded back, can not enter first phosphor powder layer 40 once more, also unlikely generation secondary excitation phenomenon.That is to say that the configuration of this refractive index can increase light extraction efficiency.The ratio of the refractive index between first phosphor powder layer 40 and second phosphor powder layer 60 is as being 1: 1.2 (refractive index of first phosphor powder layer 40: the refractive index of second phosphor powder layer 60).Secondly, aforementioned first, second, and the 3rd embodiment relatively, the light that the led chip 20 of the 4th embodiment is sent can directly enter first phosphor powder layer 40.Thus, can reduce the loss of light through packaging body 30.
The thickness of aforementioned first phosphor powder layer 40 and second phosphor powder layer 60 can be but be not limited to 100 microns to 500 microns, for example be between 100 microns to 300 microns.
The 5th embodiment
Please refer to Fig. 6.Fig. 6 is the generalized section according to light-emitting diode the 5th embodiment of multilayer storehouse encapsulation of the present invention.Can see from figure and know that multilayer storehouse packaged LED comprises led chip 20, packaging body 30, the first optical band pass filter layer 50, reaches first phosphor powder layer 40.
First phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.As the first fluorescent material 42a, when 42b is excited, can produce first exciting light.The thickness of first phosphor powder layer 40 can be between between 100 microns (um) and 300 microns.
The first optical band pass filter layer 50 allow from the LED light of led chip 20 by and reflect first exciting light.The centre wavelength of LED light can be between 430nm to 500nm, and for example wavelength is the blue light of 465nm.The centre wavelength of first exciting light can be between 570nm to 610nm, and for example wavelength is 585 gold-tinted.Thus, the light that sends from the light-emitting diode of multilayer storehouse encapsulation is the white light that mixes blue light and gold-tinted.
The 6th embodiment
Please refer to Fig. 7.Fig. 7 is the generalized section according to light-emitting diode the 6th embodiment of multilayer storehouse encapsulation of the present invention.Can see that from figure multilayer storehouse packaged LED comprises led chip 20, packaging body 30, the first optical band pass filter layer 50, first phosphor powder layer 40, the second optical band pass filter layer 70, reaches second phosphor powder layer 60.
First phosphor powder layer 40 has a plurality of first fluorescent material 42a, 42b.Second phosphor powder layer 60 has a plurality of second fluorescent material 62a, 62b.As the first fluorescent material 42a, when 42b is excited, can produce first exciting light.As the second fluorescent material 62a, when 62b is excited, can produce second exciting light.And this second excites light wavelength to be shorter than this first to excite light wavelength.The thickness of first phosphor powder layer 40 and second phosphor powder layer 60 can be between between 100 microns (um) and 300 microns.
The first optical band pass filter layer 50 allow from the LED light of led chip 20 by and reflect first exciting light.The second optical band pass filter layer 70 allow LED light, first exciting light by and reflect second exciting light.The centre wavelength of LED light can be between 430nm to 500nm, and for example wavelength is the blue light of 465nm.The centre wavelength of first exciting light can be between 610nm to 780nm, and for example wavelength is 650 ruddiness.The centre wavelength of second exciting light can be between 540nm to 560nm, and for example wavelength is 550 green glow.Thus, the mixing light that sends from the light-emitting diode of multilayer storehouse encapsulation is the white light of mixing blue light, ruddiness and green glow.
Though first, second, third and fourth of aforementioned multilayer storehouse packaged LED, five and six embodiment all describe with the purpose that produces mixed white light, not as limit.Mixed light can also be any photochromic.And LED light, first exciting light, second exciting light, and also non-above-mentioned ultraviolet light, ruddiness, gold-tinted, green glow or the blue light of being limited to of the 3rd exciting light.Also can adopt other coloured light.
About the material of the above-mentioned first fluorescent material 42a, 42b and the second fluorescent material 62a, 62b, can be but to be not limited to following table listed.
| Photochromic | The fluorescent material material |
| Blue light | (Ba，Sr，Ca) 5(PO 4) 3(Cl，F，Br，OH):Eu 2+，Mn 2+，Sb 3+ (Ba，Sr，Ca)MgAl 10O 17:Eu 2+，Mn 2+ (Ba，Sr，Ca)BPO 5:Eu 2+，Mn 2+ |
| Blue green light | Sr 4Al 14O 25:Eu 2+ BaAl 8O 13:Eu 2+ |
| Green glow | (Ba，Sr，Ca)MgAl 10O 17:Eu 2+，Mn 2+(BaMn) (Ba，Sr，Ca)Al 2O 4:Eu 2+ (Y，Gd，Lu，Sc，La)BO 3:Ce 3+，Tb 3+ Ca 8Mg(SiO 4) 4Cl 2:Eu 2+，Mn 2+ |
| Yellow tangerine light | (Sr，Ca，Ba，Mg，Zn) 2P 2O 7:Eu 2+，Mn 2+(SPP) (Ca，Sr，Ba，Mg) 10(PO 4) 6(F，Cl，Br，OH):Eu 2+，Mn 2+(HALO) |
| Ruddiness | (Gd，Y，Lu，La) 2O 3:Eu 3+，Bi 3+ (Gd，Y，Lu，La) 2O 2S:Eu 3+，Bi 3+ (Gd，Y，Lu，La)VO 4:Eu 3+，Bi 3+ (Ca，Sr)S:Eu 2+，Ce 3+ SrY 2S 4:Eu 2+，Ce 3+ |
In sum, the present invention is by the structure of multilayer storehouse, and the corresponding wavelength of collocation is selected, and can be lifted out optical efficiency.Secondly, add the suitable configuration of refractive index or optical band pass filter layer, can further avoid the secondary excitation and the absorption loss water of fluorescent material.
Though the present invention with aforesaid preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and modification, therefore scope of patent protection of the present invention must be looked the appended claim person of defining of this specification and is as the criterion.
Claims (21)
1. the light-emitting diode of a multilayer storehouse encapsulation is characterized in that, comprises:
One light-emitting diode chip for backlight unit produces a LED light when being driven;
One first phosphor powder layer is disposed on this led chip and has a plurality of first fluorescent material, and this first fluorescent material is produced one first exciting light by this LED optical excitation;
One first optical band pass filter layer is disposed on this first phosphor powder layer and makes this LED light and this first exciting light passes through; And
One second phosphor powder layer is disposed on this first optical band pass filter layer and has a plurality of second fluorescent material, and this second fluorescent material is produced one second exciting light by this LED optical excitation, and this second excites light wavelength to be shorter than this first to excite light wavelength.
2. the light-emitting diode of multilayer storehouse as claimed in claim 1 encapsulation is characterized in that this first optical band pass filter layer reflects this second exciting light, and this LED light wavelength is shorter than this and second excites light wavelength.
3. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 2, it is characterized in that, the centre wavelength of this LED light is between 430nm to 500nm, and the centre wavelength of this first exciting light is between 610nm to 780nm, and the centre wavelength of this second exciting light is between 540nm to 560nm.
4. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 2 is characterized in that the thickness of this first phosphor powder layer is between 100 microns and 300 microns.
5. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 2 is characterized in that the thickness of this second phosphor powder layer is between 100 microns and 300 microns.
6. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 2 is characterized in that other comprises:
One second optical band pass filter layer is disposed on this second phosphor powder layer and this LED light, this first exciting light and this second exciting light is passed through; And
One the 3rd phosphor powder layer is disposed on this second optical band pass filter layer and has a plurality of the 3rd fluorescent material, and the 3rd fluorescent material is produced one the 3rd exciting light by this LED optical excitation, and the 3rd excites light wavelength to be shorter than this second to excite light wavelength.
7. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 6 is characterized in that this second optical band pass filter layer reflects the 3rd exciting light.
8. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 6 is characterized in that the thickness of the 3rd phosphor powder layer is between 100 microns and 300 microns.
9. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 6 is characterized in that this LED light wavelength is shorter than the 3rd and excites light wavelength.
10. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 9, it is characterized in that, the centre wavelength of this LED light is between 320nm to 380nm, the centre wavelength of this first exciting light is between 610nm to 780nm, the centre wavelength of this second exciting light is between 530nm to 560nm, and the centre wavelength of the 3rd exciting light is between 380nm to 500nm.
11. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 9, it is characterized in that, the centre wavelength of this LED light is between 430nm to 500nm, the centre wavelength of this first exciting light is between 610nm to 780nm, the centre wavelength of this second exciting light is between 555nm to 580nm, and the centre wavelength of the 3rd exciting light is between 540nm to 555nm.
12. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 1 is characterized in that other comprises a packaging body, this packaging body is folded between this first phosphor powder layer and this led chip.
13. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 12, it is characterized in that, this packaging body has an oblique side, and this packaging body is an exiting surface with respect to the surface that this led chip is set, and this oblique side will be from this LED light of this led chip towards this exiting surface reflection.
14. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 12 is characterized in that a refractive index of this first phosphor powder layer is greater than a refractive index of this packaging body.
15. the light-emitting diode of a multilayer storehouse encapsulation is characterized in that, comprises:
One light-emitting diode chip for backlight unit produces a LED light when being driven;
One first phosphor powder layer, the thickness of this first phosphor powder layer are between 100 microns and 500 microns, and this first phosphor powder layer is disposed on this led chip and has a plurality of first fluorescent material, and this first fluorescent material is produced one first exciting light by this LED optical excitation; And
One second phosphor powder layer, this second phosphor powder layer thickness is between 100 microns and 500 microns, this second phosphor powder layer is disposed on this first phosphor powder layer and has a plurality of second fluorescent material, this second fluorescent material is produced one second exciting light by this LED optical excitation, and this LED light wavelength is shorter than this and second excites light wavelength, and this second excites light wavelength to be shorter than this first to excite light wavelength.
16. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 15 is characterized in that a refractive index of this first phosphor powder layer is 1: 1.2 with the ratio of a refractive index of this second phosphor powder layer.
17. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 15, it is characterized in that, the centre wavelength of this LED light is between 430nm to 500nm, and the centre wavelength of this first exciting light is between 610nm to 780nm, and the centre wavelength of this second exciting light is between 540nm to 560nm.
18. the light-emitting diode of a multilayer storehouse encapsulation is characterized in that, comprises:
One light-emitting diode chip for backlight unit produces a LED light when being driven;
One first optical band pass filter layer is disposed on this led chip and this LED light is passed through; And
One first phosphor powder layer is disposed on this first optical band pass filter layer and has a plurality of first fluorescent material, and this first fluorescent material is produced one first exciting light by this LED optical excitation, and this first optical band pass filter layer reflects this first exciting light.
19. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 18 is characterized in that the centre wavelength of this LED light is between 430nm to 500nm, the centre wavelength of this first exciting light is between 570nm to 610nm.
20. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 18 is characterized in that other comprises:
One second optical band pass filter layer, be disposed on this first phosphor powder layer and make this LED light, and this first exciting light pass through; And
One second phosphor powder layer, be disposed on this second optical band pass filter layer and have a plurality of second fluorescent material, this second fluorescent material is produced one second exciting light by this LED optical excitation, and this second excites light wavelength to be shorter than this first to excite light wavelength, and this second optical band pass filter layer reflects this second exciting light.
21. the light-emitting diode of multilayer storehouse encapsulation as claimed in claim 20, it is characterized in that, the centre wavelength of this LED light is between 430nm to 500nm, and the centre wavelength of this first exciting light is between 610nm to 780nm, and the centre wavelength of this second exciting light is between 540nm to 560nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010101711587A CN102237477A (en) | 2010-04-29 | 2010-04-29 | Multilayer stack-packaged light- emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101711587A CN102237477A (en) | 2010-04-29 | 2010-04-29 | Multilayer stack-packaged light- emitting diode |
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| CN102237477A true CN102237477A (en) | 2011-11-09 |
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| CN2010101711587A Pending CN102237477A (en) | 2010-04-29 | 2010-04-29 | Multilayer stack-packaged light- emitting diode |
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| CN105937717A (en) * | 2015-03-06 | 2016-09-14 | 欧司朗股份有限公司 | Method used for manufacturing lighting module and lighting module |
| CN107731993A (en) * | 2016-08-11 | 2018-02-23 | 三星电子株式会社 | The method for manufacturing semiconductor package |
| CN108807648A (en) * | 2018-06-21 | 2018-11-13 | 旭宇光电（深圳）股份有限公司 | A kind of light-emitting diode encapsulation structure and packaging method |
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| CN111554789A (en) * | 2020-06-09 | 2020-08-18 | 福建天电光电有限公司 | Multilayer dispensing packaging process based on light-emitting diode cup interior |
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Application publication date: 20111109 |