CN101338879A - Method for preparing white light LED utilizing YAG transparent ceramic - Google Patents
Method for preparing white light LED utilizing YAG transparent ceramic Download PDFInfo
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- CN101338879A CN101338879A CNA2008101387919A CN200810138791A CN101338879A CN 101338879 A CN101338879 A CN 101338879A CN A2008101387919 A CNA2008101387919 A CN A2008101387919A CN 200810138791 A CN200810138791 A CN 200810138791A CN 101338879 A CN101338879 A CN 101338879A
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Abstract
The invention discloses a method for preparing a white-light LED by YAG transparent ceramics. Firstly, a bare blue-light or ultraviolet-light LED chip is fixed in a support reflector by insulating glue; a YAG transparent ceramic layer is coated or enclosed on the light emitting path of the blue-light or ultraviolet-light chip after the electrode lead is welded by an ultrasonic ball-bonding machine; the wavelength of the blue-light LED chip drops within 450nm-480nm, and the wavelength of the ultraviolet LED drops within 250nm-540nm; the ceramic granules used by the YAG transparent ceramic layer drops within 1nm-300nm. The color coordinate of the emitted light can be changed by adjusting the thickness and the granule density of the ceramic layer. The invention can efficiently settle the problem of the attenuation of wavelength conversion material under high temperature; in addition, the invention can also effectively settle the problems of inconsistency of yellow diaphragm, blue-light diaphragm and white-light diaphragm, etc in the existing methods of white-light LED fabrication; the operation process is relatively simple, the reliability is high and the cost is low.
Description
Technical field
The present invention relates to utilize the YAG crystalline ceramics to be transformed into the method that emits white light, belong to light emitting diode (LED) technical field by blue light or ultraviolet LED (light emitting diode).
Background technology
Along with semiconductor devices particularly along with the fast development of high brightness LED (LED) technology, what world resource lacked progressively shows especially, people more pay attention to seeking new illumination substitution material.The appearance of blue-ray LED has realized white-light illuminating after 1999, propelling along with the semiconductor lighting industry, particularly the application in general lighting, backlight, decorative lighting impels humane searching efficient higher, the manufacture method of the white light LEDs that the life-span is longer, reliability is higher.
The main method of making white light LEDs at present is to utilize the nontransparent fluorescent material of blue-ray LED or ultraviolet LED chip coating molecule by wavelength conversion of productions white light LEDs.Because continuing to light, blue-ray LED can cause temperature to raise, material for transformation of wave length can be degenerated, simultaneously because the material for transformation of wave length of coating is a non-transparent material, the light that sends at blue light or ultraviolet chip by the time phenomenon such as scattering absorption can take place, make light extraction efficiency not high; Simultaneously because the inhomogeneous meeting of applied thickness has a strong impact on its hot spot and white light colour temperature.For example because problem such as the coating inhomogeneous yellow aperture that causes, blue hot spot, white light colour temperature be inconsistent.
Chinese patent CN1618925 discloses a kind of method of producing the white light LEDs of photochromic homogeneous, be in epoxy resin or silicones, to sneak into the fluorescent material that emits white light, also sneak in addition 0.1-10%'s and not can with the fine dust of inorganic matter end (as silicon dioxide powder) of its reaction.The fluorescent material that emits white light also can be YAG fluorescent material.This method can obtain the white light LEDs of photochromic homogeneous, can cause the problem that temperature raises, material for transformation of wave length can be degenerated and optical efficiency is not high but still exist because blue-ray LED continues to light.
Chinese patent CN1815765 discloses a kind of YAG chip-type white-light light-emitting-diode and method for packing thereof, be the light that the part blue light that utilizes the YAG single-chip that GaN base inorganic semiconductor LED crystal grain is sent is converted to another or multiple desirable wave band, the light of the desirable wave band after the blue light that is not converted of the residue sent of LED crystal grain and the single-chip conversion mixes the generation white light then.This technology is by accurate various parameters of control single-chip fluorophor, the ratio between the gold-tinted of regulating and control the conversion of fluorophor single-chip and the blue light that is not converted, the uniformity of utilizing single-chip self to have simultaneously, acquisition homogeneous, high quality white light; Solve conventional white light LED device technology and be difficult to the dispersiveness of control fluorophor powder in silicone grease class or resinae fluid sealant, and finally caused the uneven technical problem of white light of white light LED part.But this technology still can't solve because blue-ray LED continues to light can cause the problem that temperature raises, material for transformation of wave length can be degenerated and optical efficiency is not high.
As everyone knows, it is the YAG powder that high performance crystalline ceramics of preparation and YAG structural ceramics or luminescent powder material all need excellent performance, require powder that high phase purity is arranged, particle size is at nanoscale, the size homogeneous there is no reunion, help the eliminating of pore like this and make ceramic dense and transparent can improving luminous efficiency to luminescent material.Yttrium-aluminium-garnet (YAG) monocrystal material is a kind of solid laser crystal of extensive use.But because the large-sized YAG monocrystalline of preparation needs special equipment and complicated technology, take a large amount of noble metals simultaneously, so production cost is high always.The YAG powder can be used as fluorescent material by trivalent rare earth ionses such as doping Tb, Ce, Eu, and YAG fluorescent material main component is: Y
2Gd)
3(Al
2Ga)
5O
12, be generally yellow, pale yellow powder shape material, have a wide range of applications in field of light emitting materials.Compare with the YAG monocrystal material, the YAG laser ceramics has the following advantages: the manufacturing cycle of pottery is short, and cost is low; Can mix in the ceramic material than the neodymium ion of higher concentration in the crystal and do not have concentration quenching, improve conversion efficiency; Pottery preparation technology can obtain the large scale working-laser material.Because have excellent mechanical behavior under high temperature, the YAG pottery can also be widely used as high-temperature structural components simultaneously.The YAG laser ceramics is mainly yttrium-aluminium-garnet (Y
3Al
5O
12→ YAG) or yttrium scandium aluminium garnet (Y
3ScAl
4O
12→ YSAG) the Nd that mixed
3+, Er
3+, Yb
3+, Tm
3+Or Cr
4+Plasma is realized.
Summary of the invention
The present invention is directed to the deficiency that existing preparation white light LEDs method exists, provide the YAG crystalline ceramics that utilizes that a kind of cost is low, luminous efficiency is high, the life-span is long, reliability is high to prepare the method for white light LEDs.
The method that the YAG of utilization crystalline ceramics of the present invention prepares white light LEDs is:
At first utilize insulation glue that exposed blue light or ultraviolet leds chip are fixed in the support speculum, apply on the light path or encapsulation YAG transparent ceramic layer in going out of blue light or ultraviolet leds chip after utilizing ultrasonic ball bonding machine to weld contact conductor, the wavelength of used blue-light LED chip is between the 450nm-480nm wave band, the wavelength of ultraviolet leds is between 250nm-540nm, and the used YAG crystalline ceramics of YAG transparent ceramic layer is for being doped with Nd
3+, Er
3+, Yb
3+, Tm
3+Or Cr
4+Yttrium-aluminium-garnet (the Y of ion
3Al
5O
12→ YAG) or yttrium scandium aluminium garnet (Y
3ScAl
4O
12→ YSAG), the size of ceramic particle is 1nm-300nm.
The thickness of YAG transparent ceramic layer is 200nm-1000nm, and the thickness of YAG transparent ceramic layer is suitably adjusted according to the watt level of blue light or ultraviolet LED chip.Under the situation of the density constant of YAG transparent ceramic layer, package thickness and chip power are proportional relations.
The coating of YAG transparent ceramic layer or packing forms have following several:
1. be coated to the top of blue light in the support speculum or ultraviolet leds chip after utilizing silica gel or epoxy resin that YAG crystalline ceramics particle is mixed; under 80 ℃-100 ℃ temperature, solidify then; carry out conventional encapsulating encapsulation at last on the YAG transparent ceramic layer, the weight proportion of YAG crystalline ceramics particle and epoxy resin or glue special is 0.5-1.5: 10.
2. above blue light or ultraviolet leds chip, utilize earlier ball bonding machine welding electrode lead-in wire; utilize epoxy resin that contact conductor is solidificated in and form a flat board in the bowl-type reflector; on flat board, place and be blended in the solid spherical lens that is made in epoxy resin, silica gel or the silica by YAG crystalline ceramics particle in advance; and use epoxy resin cure; or directly on flat board, now make solid spherical lens, the weight of YAG crystalline ceramics particle and epoxy resin, silica gel or silica is joined and is 1-3: 10.
3. with the particle doped hollow spherical lens of making the wall thickness unanimity in epoxy resin or the silica of YAG crystalline ceramics, by being cured on the bowl-type reflector at the inner infusion epoxy resin of hollow spherical lens, silica gel or silica, the weight proportion of YAG crystalline ceramics particle and epoxy resin or silica is 1-3: 10.
Said method is to utilize the YAG crystalline ceramics as material for transformation of wave length, and light absorbent portion beam split by the YAG transparent ceramic layer time that blue light or ultraviolet LED chip are sent converts the light that is different from the luminescence chip wavelength to, and the light of different wave length mixes and obtains white light.By adjusting the chromaticity coordinates that ceramic layer thickness and grain density change the white light that sends.Can be applied to the encapsulation of common small-power blue chip, also can be applied to the encapsulation of semiconductor lighting with the power cake core.
The present invention efficiently solves in the prior art problem such as continue to light that the light extraction efficiency that reasons such as the degeneration of the material for transformation of wave length that causes and, scattering not high owing to the material for transformation of wave length light transmission rate of coating cause is not high owing to blue light or ultraviolet leds, the inhomogeneous yellow hot spot that causes of coating, blue hot spot, white light colour temperature are inconsistent, improved the service life of white light LEDs greatly, near the life-span of semiconductor light-emitting-diode, technological operation is simple relatively, reliability is high, cost is low, and the correlated colour temperature that obtains white light after the conversion is between 1500K-15000K.
Description of drawings
Fig. 1 is the fixing schematic diagram of blue light or ultraviolet leds chip in small-power bowl-type reflector.
Fig. 2 is the schematic diagram of high-power bowl-type reflector.
Fig. 3 is the schematic diagram of plate solid lens YAG transparent ceramic layer.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is the schematic diagram of hollow ball shape lens YAG transparent ceramic layer.
Fig. 6 is the vertical view of Fig. 5.
Wherein: 1, small-power bowl-type reflector, 2, negative wire, 3, positive wire, 4, blue light or ultraviolet LED chip, 5, contact conductor, 6, pin, 7, high-power bowl-type reflector, 8, flat board, 9, solid spherical lens, 10, hollow spherical lens.
The specific embodiment
The method that the present invention utilizes the YAG crystalline ceramics to prepare white light LEDs is that the light with light absorption portion luminescence chip by the YAG transparent ceramic material time of blue light or ultraviolet LED luminescence chip converts the light that is different from the luminescence chip wavelength to, and the light of different wave length mixes and obtains white light.Required element or material comprise blue light or ultraviolet leds luminescence chip, YAG crystalline ceramics (ceramic layer), support speculum and Embedding Material at least.The support speculum adopts the bowl-type reflector, and Embedding Material adopts transparent insulation glue such as silica gel, epoxy resin, silica.As shown in Figure 1, the bottom that at first utilizes insulation glue that exposed blue light or ultraviolet leds chip 4 are fixed to bowl-shape reflector 1.Low power bowl-type reflector 1 is connected with negative wire 2, one sides positive wire 3.Powerful bowl-type reflector 7 which is provided with pin 6 as shown in Figure 2, and the welding electrode that act as of pin 6 goes between.Weld the contact conductor 5 between blue light or ultraviolet leds chip 4 and the positive wire 3, encapsulated the YAG transparent ceramic layer on the light path in going out of blue light or ultraviolet leds chip 4 then.
Can the YAG transparent ceramic layer be encapsulated into going out on the light path of blue light or ultraviolet LED chip 4 by following several modes:
1. the top that is coated to blue/UV led chip 4 after utilizing silica gel or epoxy resin that YAG crystalline ceramics particle is mixed is (different with chip power according to the ceramic particle size; the part by weight of ceramic particle and epoxy resin or silica gel is between 0.5: 10 to 1.5: 10); just be coated in the bowl-type reflector; under 80 ℃-100 ℃ temperature, solidify then, by epoxy resin the curing of YAG crystalline ceramics stratum granulosum is wrapped at last.
2. as shown in Figure 3 and Figure 4; the encapsulation of YAG transparent ceramic layer also can utilize earlier ball bonding machine welding electrode lead-in wire above blue light or ultraviolet leds chip 4; utilize epoxy resin that contact conductor is solidificated in and form a flat board 8 in the bowl-type reflector; the destruction in order to avoid when encapsulation, will go between; on dull and stereotyped 8, place and be blended in epoxy resin by YAG crystalline ceramics particle in advance; (different with chip power in silica gel or the silica according to the ceramic particle size; YAG crystalline ceramics particle and epoxy resin; the part by weight of silica gel or silica is between 1: 10 to 3: 10) the solid spherical lens 9 that is made, and use epoxy resin cure.Also can directly on dull and stereotyped 8, now make solid spherical lens.
The YAG crystalline ceramics is particle doped (different with chip power according to the ceramic particle size in epoxy resin, silica gel or silica 3., the part by weight of YAG crystalline ceramics particle and epoxy resin, silica gel or silica is between 1: 10 to 3: 10) make the consistent hollow spherical lens 10 of wall thickness as shown in Figure 5 and Figure 6, by lens being cured on the bowl-type reflector at hollow spherical lens 10 inner perfusion silica gel, epoxy resin or silica.
Used ceramic particle size is between 1nm-300nm, and packaged YAG transparent ceramic layer THICKNESS CONTROL is within the scope of 200nm-1000nm.The thickness of transparent ceramic layer will suitably be adjusted according to the watt level of blue light/ultraviolet chip, by adjusting the chromaticity coordinates that ceramic layer thickness and grain density change the light that sends.
The wavelength of the blue-ray LED luminescence chip that uses is between the 450nm-480nm wave band, and the wavelength of ultraviolet LED is between 250nm-540nm, and the correlated colour temperature that obtains white light after the conversion is between 1500K-15000K.
Claims (5)
1. method of utilizing YAG crystalline ceramics preparation from light LED, it is characterized in that: at first utilize insulation glue that exposed blue light or ultraviolet leds chip are fixed in the support speculum, apply on the light path or encapsulation YAG transparent ceramic layer in going out of blue light or ultraviolet leds chip after utilizing ultrasonic ball bonding machine to weld contact conductor, the wavelength of used blue-light LED chip is between the 450nm-480nm wave band, the wavelength of ultraviolet leds is between 250nm-540nm, and the used YAG crystalline ceramics of YAG transparent ceramic layer is for being doped with Nd
3+, Er
3+, Yb
3+, Tm
3+Or Cr
4+The yttrium-aluminium-garnet of ion or yttrium scandium aluminium garnet, the size of ceramic particle is 1nm-300nm.
2. prepare the method for white light LEDs according to the described YAG of the utilization crystalline ceramics of claim 1, it is characterized in that the thickness of described YAG transparent ceramic layer is 200nm-1000nm.
3. the method for preparing white light LEDs according to the described YAG of the utilization crystalline ceramics of claim 1; it is characterized in that; the form of application of described YAG transparent ceramic layer is the top that is coated to blue light in the support speculum or ultraviolet leds chip after utilizing silica gel or epoxy resin that YAG crystalline ceramics particle is mixed; under 80 ℃-100 ℃ temperature, solidify then; carry out conventional encapsulating encapsulation at last on the YAG transparent ceramic layer, the weight proportion of YAG crystalline ceramics particle and epoxy resin or glue special is 0.5-1.5: 10.
4. the method for preparing white light LEDs according to the described YAG of the utilization crystalline ceramics of claim 1; it is characterized in that; the packing forms of described YAG transparent ceramic layer utilizes earlier ball bonding machine welding electrode lead-in wire above blue light or ultraviolet leds chip; utilize epoxy resin that contact conductor is solidificated in and form a flat board in the bowl-type reflector; on flat board, place and be blended in epoxy resin by YAG crystalline ceramics particle in advance; the solid spherical lens that is made in silica gel or the silica; and use epoxy resin cure; or directly on flat board, now do solid spherical lens, YAG crystalline ceramics particle and epoxy resin; the weight of silica gel or silica is joined and is 1-3: 10.
5. the method for preparing white light LEDs according to the described YAG of the utilization crystalline ceramics of claim 1, it is characterized in that, the packing forms of described YAG transparent ceramic layer is with the particle doped hollow spherical lens of making the wall thickness unanimity in epoxy resin or the silica of YAG crystalline ceramics, by being cured on the bowl-type reflector at the inner infusion epoxy resin of hollow spherical lens, silica gel or silica, the weight proportion of YAG crystalline ceramics particle and epoxy resin or silica is 1-3: 10.
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| CNB2008101387919A CN100565000C (en) | 2008-08-11 | 2008-08-11 | Utilize the YAG crystalline ceramics to prepare the method for white light LEDs |
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|---|---|---|---|
| CNB2008101387919A CN100565000C (en) | 2008-08-11 | 2008-08-11 | Utilize the YAG crystalline ceramics to prepare the method for white light LEDs |
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| CN101338879A true CN101338879A (en) | 2009-01-07 |
| CN100565000C CN100565000C (en) | 2009-12-02 |
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| CN101988636A (en) * | 2009-07-31 | 2011-03-23 | 歌尔声学股份有限公司 | White light LED (light-emitting diode) and preparation method thereof |
| CN102130108A (en) * | 2010-12-14 | 2011-07-20 | 黄金鹿 | Transparent ceramic packaged light emitting diode (LED) light source |
| CN102249660A (en) * | 2011-04-22 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Composite structure fluorescent ceramic for GaInN white light LED (Light Emitting Diode) and preparation method thereof |
| CN103443941A (en) * | 2011-03-31 | 2013-12-11 | 松下电器产业株式会社 | Semiconductor light-mitting device |
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| DE19638667C2 (en) * | 1996-09-20 | 2001-05-17 | Osram Opto Semiconductors Gmbh | Mixed-color light-emitting semiconductor component with luminescence conversion element |
| KR20050053798A (en) * | 1996-06-26 | 2005-06-08 | 오스람 게젤샤프트 미트 베쉬랭크터 하프퉁 | Light-emitting semiconductor component with luminescence conversion element |
| US6630691B1 (en) * | 1999-09-27 | 2003-10-07 | Lumileds Lighting U.S., Llc | Light emitting diode device comprising a luminescent substrate that performs phosphor conversion |
| CN1204083C (en) * | 2002-08-28 | 2005-06-01 | 中国科学院上海硅酸盐研究所 | Prepn of ion doped yttrium aluminium garnet nano-powder |
| CN100389504C (en) * | 2005-12-19 | 2008-05-21 | 中山大学 | YAG chip-type white-light light-emitting-diode and its packing method |
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2008
- 2008-08-11 CN CNB2008101387919A patent/CN100565000C/en not_active Expired - Fee Related
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| CN101988636A (en) * | 2009-07-31 | 2011-03-23 | 歌尔声学股份有限公司 | White light LED (light-emitting diode) and preparation method thereof |
| CN101931040A (en) * | 2010-07-20 | 2010-12-29 | 嘉兴嘉尼光电科技有限公司 | Packaging of LED area light source |
| CN102130108A (en) * | 2010-12-14 | 2011-07-20 | 黄金鹿 | Transparent ceramic packaged light emitting diode (LED) light source |
| CN103443941A (en) * | 2011-03-31 | 2013-12-11 | 松下电器产业株式会社 | Semiconductor light-mitting device |
| CN102249660A (en) * | 2011-04-22 | 2011-11-23 | 中国科学院上海光学精密机械研究所 | Composite structure fluorescent ceramic for GaInN white light LED (Light Emitting Diode) and preparation method thereof |
| CN102249660B (en) * | 2011-04-22 | 2013-05-08 | 中国科学院上海光学精密机械研究所 | Composite structure fluorescent ceramic for GaInN white light LED (Light Emitting Diode) and preparation method thereof |
| CN104755966A (en) * | 2012-10-19 | 2015-07-01 | 奥斯兰姆施尔凡尼亚公司 | Index matched composite materials and light sources incorporating the same |
| CN104755966B (en) * | 2012-10-19 | 2019-09-24 | 奥斯兰姆施尔凡尼亚公司 | The composite material of index matching and light source comprising it |
| CN108180403A (en) * | 2018-02-12 | 2018-06-19 | 中国人民大学 | A kind of liquid cold laser light-emitting device and preparation method thereof |
| CN109336582A (en) * | 2018-09-30 | 2019-02-15 | 汪阳 | A kind of composite construction fluorescence ceramics and preparation method thereof for white light LEDs |
| CN114361315A (en) * | 2020-10-13 | 2022-04-15 | 福建中科芯源光电科技有限公司 | White light LED chip and device packaged by inorganic material, and preparation method and application thereof |
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