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Red and green composite fluorescence glass for white-light LED (light-emitting diode) and preparation method of fluorescence glass

A technology of composite fluorescent and red fluorescent powder, which is applied in the field of red-green composite fluorescent glass for white LEDs and its preparation, which can solve the problems of easy change, co-fired crystal lattice environment, poor heat resistance, aging resistance and moisture resistance, etc. problem, to achieve the effect of improving performance, reducing process cost and high conversion efficiency

Pending Publication Date: 2017-11-21
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] For high-power white LED packaging, the role of phosphor is to combine light and color to form white light. The commonly used method of phosphor coating is to mix phosphor with encapsulant (epoxy resin or silica gel), and then apply it on the LED chip. In fact, because the coating process is difficult to accurately control the thickness and shape of the phosphor coating layer, the color temperature and color rendering index of LED devices fluctuate greatly, which affects product quality
In addition, since the phosphor powder adhesive layer is made of epoxy resin or silica gel and phosphor powder, the heat resistance, aging resistance and moisture resistance are poor.
Chinese patent document (publication number 102442778A) discloses a kind of fluorescent glass and its preparation method and application. Glass powder and fluorescent powder are mixed and dried at 100-150°C to obtain fluorescent glass, but the prepared fluorescent glass has low light efficiency.
[0003] However, the above research has the difficulty of co-sintering the red phosphor powder and the matrix glass powder (the lattice environment of the luminescent ion of the red phosphor powder is easy to change), and it is even more difficult to prepare a composite fluorescent glass body.

Method used

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  • Red and green composite fluorescence glass for white-light LED (light-emitting diode) and preparation method of fluorescence glass
  • Red and green composite fluorescence glass for white-light LED (light-emitting diode) and preparation method of fluorescence glass
  • Red and green composite fluorescence glass for white-light LED (light-emitting diode) and preparation method of fluorescence glass

Examples

Experimental program
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Effect test

preparation example Construction

[0032] A preparation method of red-green composite fluorescent glass for white light LED, said method comprising the following steps:

[0033] (1) Weigh according to the following mole fraction: R 2 O 5-20% mole fraction, ZnO 10-30% mole fraction, B 2 o 3 20-50% mole fraction, SiO 2 0-20% mole fraction, R'O 0-20% mole fraction, where, R 2 O, ZnO, B 2 o 3 , SiO 2 and R'O are derived from raw material R 2 CO 3 , ZnO, H 3 BO 3 , SiO 2 , R'CO 3 ;

[0034] (2) the raw material R 2 CO 3 , ZnO, H 3 BO 3 , SiO 2 , R'CO 3 After mixing evenly, melt it, the melting temperature is 900°C-1200°C, keep it warm for 1-3 hours, and obtain glass liquid;

[0035] (3) Pour the molten glass into cold water, and perform water quenching to obtain a transparent matrix glass;

[0036] (4) Grinding the glass into powder, uniformly mixing with the composite phosphor composed of the red phosphor and the green phosphor according to the mass ratio, and sintering in a muffle furnace at ...

Embodiment 1

[0039]A kind of red-green composite fluorescent glass for white light LED, it comprises matrix glass, red fluorescent powder and green fluorescent powder; Described matrix glass is mainly made of R 2 O, ZnO, B 2 o 3 , SiO 2 and R'O components are prepared from raw materials, where R 2 O is Na 2 O, R'O is BaO; specific glass components (mole fraction):

[0040]

[0041] The red phosphor is Ca1-xSrxAlSiN 3 :Eu 2+ and (Ca1-xSrx) 2 Si 5 N 8 :Eu 2+ , 0≤x≤1, the green phosphor is Lu3-xYxAl 5 o 12 : Ce 3+ , 0≤x≤1;

[0042] Wherein, the mass ratio of the matrix glass, the red phosphor powder and the green phosphor powder is glass powder:red phosphor powder:green phosphor powder=1:0.05:0.003.

[0043] Adopt fluorescence spectrometer (FLS8900, British Edinburgh Instruments company) to measure the red-green composite fluorescent glass of above-mentioned gained, the emission spectrogram of gained is as follows figure 2 Shown; The physical figure of the obtained red-gree...

Embodiment 2

[0045] A kind of red-green composite fluorescent glass for white light LED, it comprises matrix glass, red fluorescent powder and green fluorescent powder; Described matrix glass is mainly made of R 2 O, ZnO, B 2 o 3 , SiO 2 and R'O components are prepared from raw materials, where R 2 O is Na 2 O, R'O is BaO; specific glass components (mole fraction):

[0046]

[0047] The red phosphor is Ca1-xSrxAlSiN 3 :Eu 2+ and (Ca1-xSrx) 2 Si 5 N 8 :Eu 2+ , 0≤x≤1, the green phosphor is Lu3-xYxAl 5 o 12 : Ce 3+ , 0≤x≤1;

[0048] Wherein, the mass ratio of the matrix glass, the red phosphor powder and the green phosphor powder is glass powder:red phosphor powder:green phosphor powder=1:0.05:0.001.

[0049] Adopt fluorescence spectrometer (FLS8900, British Edinburgh Instruments company) to measure the red-green composite fluorescent glass of above-mentioned gained, the emission spectrogram of gained is as follows image 3 shown. The fluorescence test results of Example 2 ...

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Abstract

The invention discloses red and green composite fluorescence glass for a white-light LED (light-emitting diode). The fluorescence glass comprises host glass, red fluorescent powder and green fluorescent powder. The preparation method of the glass includes the steps: preparing glass substrates; grinding the glass substrates into glass powder; mixing the glass powder and the fluorescent powder; performing sintering and annealing to obtain the red and green composite fluorescence glass. The composite fluorescence glass and blue-light chips are packaged to prepare the LED, and the LED is high in light effect and color development, low in light attenuation and less in color shift and color tolerance.

Description

technical field [0001] The invention relates to a fluorescent glass and a preparation method thereof, in particular to a red-green composite fluorescent glass for white light LEDs and a preparation method thereof. Background technique [0002] For high-power white LED packaging, the role of phosphor is to combine light and color to form white light. The commonly used method of phosphor coating is to mix phosphor with encapsulant (epoxy resin or silica gel), and then apply it on the LED chip. In fact, because the coating process is difficult to accurately control the thickness and shape of the phosphor coating layer, the color temperature and color rendering index of LED devices fluctuate greatly, which affects product quality. In addition, since the phosphor powder adhesive layer is prepared by blending epoxy resin or silica gel with phosphor, it has poor heat resistance, aging resistance and moisture resistance. Chinese Patent Document (Publication No. 102442778A) disclose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/12C03C3/068
CPCC03C3/068C03C4/12
Inventor 李杨邹军石明明杨波波李文博房永征
Owner SHANGHAI INST OF TECH
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