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CE: YAG fluorescent glass for white light LED and its preparation method

A fluorescent glass and glass powder technology, applied in the field of luminescent materials, can solve the problems of microcrystalline lattice defects, poor luminous effect, poor material transparency, etc. Effect

Active Publication Date: 2018-06-22
中科皓烨(东莞)材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main component of the glass matrix is ​​silicon-aluminum oxide, the transparency of the material is poor, and there are many microcrystalline lattice defects precipitated by high-temperature crystallization, resulting in low luminous efficiency.
[0007] Wuhan University of Technology applied for the patent of Chinese invention patent CN101643315B "low softening point fluorescent glass for white light LED and its preparation method", which discloses a fluorescent glass containing Ce:YAG fluorescent crystal phase, and the glass matrix component is Na 2 O-ZnO-B 2 o 3 -SiO 2 -Al 2 o 3 -CaO-MgO-K 2 O, there are many glass components, and the transparency of the glass body is low, resulting in poor luminous effect
[0008] The patent of Chinese patent CN103183473A "Ce:YAG glass-ceramic and its preparation method for white light LED" discloses a fluorescent glass containing Ce:YAG fluorescent crystal phase, and the glass matrix component is TeO 2 -GeO 2 -ZnO-K 2 O-SiO 2 -B 2 o 3 -Sb 2 o 3 -..., TeO in the raw material of the glass component 2 、GeO 2 The price is relatively expensive, not suitable for the mass production of civilian LED fluorescent materials

Method used

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  • CE: YAG fluorescent glass for white light LED and its preparation method
  • CE: YAG fluorescent glass for white light LED and its preparation method
  • CE: YAG fluorescent glass for white light LED and its preparation method

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Effect test

Embodiment 1

[0044] According to 48%PbO: 33%B 2 O 3 : 14% ZnO: 5% SiO 2 (mol ratio) Weigh the powder raw materials, mix them and melt them at a temperature of 800°C and keep them warm for 3 hours. After obtaining the glass powder according to the above steps, add 3wt% Ce:YAG fluorescent powder, mix and place in a crucible. Put it directly into a resistance furnace at 600°C, heat it for 30 minutes, and then shape, and an annealing temperature of 300°C to obtain a fluorescent glass sheet.

[0045] Fluorescent glass such as figure 1 , Observation shows that the material prepared by this process has good uniformity, and the crystal phase containing yttrium aluminum garnet (YAG) has been evenly distributed in the glass matrix. After the fluorescent glass sheet is ground and polished, it is packaged together with the blue chip. figure 2 . image 3 It is a blue light spectrum with a peak wavelength of 450nm. Under the excitation of the blue light, the fluorescent glass material emits yellow light, w...

Embodiment 2

[0047] According to 48%PbO: 33%B 2 O 3 : 14% ZnO: 5% SiO 2 (mol ratio) Weigh the powder raw materials, mix them and melt them at a temperature of 800°C and keep them for 3 hours. After the glass powder is obtained according to the above steps, add 5wt% Ce:YAG fluorescent powder, mix and place in a crucible. Put it directly into a resistance furnace at 600°C, heat it for 30 minutes, and then shape, and an annealing temperature of 300°C to obtain a fluorescent glass sheet. After grinding and polishing, it combines with the blue light emitted by the blue chip to form a positive white light.

Embodiment 3

[0049] According to 48%PbO: 33%B 2 O 3 : 14% ZnO: 5% SiO 2 (mol ratio) Weigh the powder raw materials, mix them and melt them at a temperature of 800°C and keep them for 3 hours. After obtaining the glass powder according to the above steps, add 2wt% Ce:YAG fluorescent powder, mix it and place it in a crucible. Put it directly into a resistance furnace at 600°C, heat it for 30 minutes, and then shape, and an annealing temperature of 300°C to obtain a fluorescent glass sheet. After grinding and polishing, it combines with the blue light emitted by the blue chip to form a positive white light.

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Abstract

The invention provides low-softening-point Ce:YAG fluorescent glass for white-light LED and a preparation method of the Ce:YAG fluorescent glass. According to the Ce:YAG fluorescent glass, Ce:YAG microcrystals are uniformly dispersed in an oxide glass matrix, and the addition amount of the Ce:YAG microcrystals is 1%-20% of the weight of the oxide glass matrix. The preparation method of the Ce:YAG fluorescent glass comprises the following steps: after uniformly mixing multiple oxide powder, and melting, so as to obtain a glass melt; rapidly pouring the glass melt into cold water, so as to obtain glass fragments; crushing and milling the glass fragments into uniform powder, and sieving; uniformly mixing sieved glass powder with Ce:YAG fluorescent microcrystals, heating, taking out the mixture, and forming, so as to obtain a green body; and annealing the green body, so as to obtain the low-softening-point Ce:YAG fluorescent glass for the white-light LED. The Ce:YAG fluorescent glass has the beneficial effects that formula components are few, the raw materials are cheap, the softening point is low, and the preparation process is simple; the Ce:YAG fluorescent glass is applicable to mass production; the obtained fluorescent glass material is high in transparency.

Description

Technical field [0001] The invention relates to a low softening point Ce: YAG fluorescent glass for white light LEDs and a preparation method thereof, and belongs to the field of luminescent materials. Background technique [0002] At present, white light emitting diode (LED) lighting has many advantages such as energy saving, environmental protection, long life, strong designability, etc., which has received great attention from people and is gradually replacing traditional incandescent lamps and fluorescent lamps. A common white LED is realized by coating a blue LED chip with a yellow-emitting phosphor that can be excited by blue light, and the blue and yellow light are mixed to form white light. However, the coated phosphor needs to be mixed with epoxy resin and other adhesives before coating. The thermal conductivity and chemical stability of epoxy resins and other adhesives are poor, epoxy resin is prone to aging, and fluorescent materials are prone to light decay, causing w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/074C03C4/12
Inventor 胡宁宁吴瑕
Owner 中科皓烨(东莞)材料科技有限责任公司