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A kind of transparent ce:yag glass ceramics and preparation method thereof

A technology of glass ceramics and glass, which is applied in the field of transparent Ce:YAG glass ceramics and its preparation, can solve the problems of increased surface defects of Ce:YAG microcrystals, low transparency of glass-ceramics, and reduced luminous efficiency, so as to reduce defects, analyze The effect of increasing crystal rate and reducing scattering

Active Publication Date: 2020-02-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In short, there have been some invention patents for glass-ceramics used in white LEDs published at home and abroad so far, but the main reason is that the material composition has introduced the addition of Y 2 o 3 and Al 2 o 3 Other components outside, so that the surface defects of Ce:YAG crystallites increase, resulting in a decrease in its luminous efficiency
At the same time, the high refractive index of Ce:YAG microcrystalline particles does not match the low refractive index of the matrix glass, resulting in low transparency and poor optical properties of the glass-ceramic

Method used

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  • A kind of transparent ce:yag glass ceramics and preparation method thereof
  • A kind of transparent ce:yag glass ceramics and preparation method thereof
  • A kind of transparent ce:yag glass ceramics and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Preparation of transparent Ce:YAG glass ceramics, the specific steps are as follows:

[0042] (1) Glass frit mixing: analytically pure Ce:YAG phosphor and Al 2 o 3 According to 25Ce:YAG phosphor: 75Al 2 o 3 The proportioning ratio of (molar ratio) is accurately weighed and placed in a mortar, fully ground and mixed in an agate mortar to obtain a uniform glass mixture;

[0043] (2) Glass frit pressing: the glass mixture is placed in the mould, and a desktop electronic tablet press is used for tableting, and the pressure is set at 10Mpa to obtain a flake glass mixture;

[0044] (3) Glass frit pre-firing: put the flake glass mixture into the crucible, then place the crucible in the muffle furnace for pre-firing, raise the temperature from room temperature to 1600 °C at a rate of 5 °C / min, keep it warm for 1 hour, and finally heat it up with the furnace Cool to room temperature to obtain bulk glass mixture;

[0045] (4) Preparation of glass by non-container method: pla...

Embodiment 2

[0049] Preparation of transparent Ce:YAG glass ceramics, the specific steps are as follows:

[0050] (1) Glass frit mixing: analytically pure Ce:YAG phosphor and Al 2 o 3 According to 50Ce:YAG phosphor: 50Al 2 o 3 The proportioning ratio of (molar ratio) is accurately weighed and placed in a mortar, fully ground and mixed in an agate mortar to obtain a uniform glass mixture;

[0051] (2) Glass frit pressing: the glass mixture is placed in the mould, and the table-top electronic tablet press is used to press the tablet, and the pressure is set to 30Mpa to obtain the flake glass mixture;

[0052] (3) Glass frit pre-firing: put the flake glass mixture into the crucible, then place the crucible in the muffle furnace for pre-firing, raise the temperature from room temperature to 1200 °C at a rate of 5 °C / min, keep it warm for 6 hours, and finally heat it up with the furnace. Cool to room temperature to obtain bulk glass mixture;

[0053] (4) Preparation of glass by containerle...

Embodiment 3

[0056] Preparation of transparent Ce:YAG glass ceramics, the specific steps are as follows:

[0057] (1) Glass frit mixing: analytically pure Ce:YAG phosphor and Al 2 o 3 According to 64Ce:YAG phosphor: 36Al 2 o 3 The proportioning ratio of (molar ratio) is accurately weighed and placed in a mortar, fully ground and mixed in an agate mortar to obtain a uniform glass mixture;

[0058] (2) Glass frit pressing: the glass mixture is placed in the mould, and the table-top electronic tablet press is used to press the tablet, and the pressure is set to 30Mpa to obtain the flake glass mixture;

[0059] (3) Glass frit pre-firing: put the flake glass mixture into the crucible, then place the crucible in the muffle furnace for pre-firing, raise the temperature from room temperature to 1500 °C at a rate of 5 °C / min, keep it for 3 hours, and finally heat it up with the furnace. Cool to room temperature to obtain bulk glass mixture;

[0060] (4) Preparation of glass by non-container me...

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Abstract

The invention relates to transparent Ce: YAG glass ceramic and a preparation method thereof. The glass ceramic is prepared by taking Ce: YAG fluorescent powder as a raw material. The preparation technology of the transparent Ce: YAG glass ceramic comprises the five steps of mixing frit, tabletting the frit, pre-sintering the frit, preparing glass by using a containerless method, and carrying out heat treatment and crystallization. According to the method, the transparent glass is prepared by taking the Ce: YAG fluorescent powder as the raw material and using the containerless solidification, the heat treatment is carried out on the transparent glass at the temperature of Tg, and Ce: YAG microcrystals are spontaneously separated out under the premise of no devitrification, so that the formation of defects is effectively reduced, and the prepared glass ceramic is enabled to have high transparency and excellent optical performance; furthermore, the problem that the refractive indexes of the Ce: YAG microcrystals are not matched with that of matrix glass is solved.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a transparent Ce:YAG glass ceramic and a preparation method thereof. Background technique [0002] White light LED has the advantages of small size, low calorific value, low power consumption, long life, fast response, environmental protection, planar packaging, and easy development into thin, light and compact products. Generation lighting source", the application prospect is very broad. At present, the mainstream of commercial white LED products is the combination of chip and amorphous phosphor to form white light. Ce:YAG phosphor is mixed in epoxy resin or silica gel and coated on the InGaN chip. The blue light emitted by the InGaN chip is partially fluoresced. The phosphor absorbs it, causing it to be excited to emit yellow light, while the unabsorbed blue light mixes with the yellow light emitted by the phosphor to produce white light. However, due to the poor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03C4/12C03C6/00C03B5/235C03B32/02F21V9/38F21Y115/10
CPCC03B5/235C03B32/02C03C1/00C03C4/12C03C10/00C03C2204/00F21V9/30Y02P40/57
Inventor 阮健张越鹏陈一帆韩建军赵修建
Owner WUHAN UNIV OF TECH
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