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Sintering aid for yttrium aluminum garnet-based fluorescent transparent ceramic and using method thereof

A technology of transparent ceramics and sintering aids, which is applied in the field of sintering aids for the preparation of garnet-based transparent ceramic fluorescent materials, which can solve the problem of difficult to obtain high-quality garnet-based transparent ceramic fluorescent materials with microstructure and difficulty in suppressing abnormally long crystal grains Large, difficult to uniformly control the uniform distribution of grain size, etc., to achieve high optical quality and compact microstructure

Inactive Publication Date: 2011-09-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, we found that it is difficult to obtain high-quality garnet-based transparent ceramic fluorescent materials with dense and uniform microstructure only by using TEOS as a sintering aid.
This is because although the use of TEOS can form liquid phase sintering, it is difficult to uniformly control the uniform distribution of grain size, and it is difficult to suppress the abnormal growth of some grains during the sintering process, resulting in uneven microstructure of the prepared ceramic material, Pores, etc. are wrapped inside the abnormally grown grains

Method used

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  • Sintering aid for yttrium aluminum garnet-based fluorescent transparent ceramic and using method thereof
  • Sintering aid for yttrium aluminum garnet-based fluorescent transparent ceramic and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 is used to prepare cerium-doped yttrium aluminum garnet transparent ceramic fluorescent material

[0014] Using commercial cerium oxide (CeO) with a purity of 99.9% 2 ), yttrium oxide (Y 2 o 3 ) and alumina (Al 2 o 3 ) powder, press Ce 0.001 Y 2.999 al 5 o 12 The composition and configuration of the powder raw materials are 30g in total, add 0.3wt% tetraethyl orthosilicate (TEOS) with a silicon oxide content ≥ 28.4%, 0.01wt% MgO with a purity of 99.9% as additives, and grind the powder by ball milling and other means Mixing, refinement, granulation and tableting after drying the powder; then apply a cold isostatic pressure above 200MPa to press it into a green body, then pre-fire to remove organic components; finally put it into a vacuum sintering furnace at 1700°C After sintering for 5 hours, the vacuum degree in the sintering and heat preservation stage is better than 1.0×10 -3 Pa, get Ce 0.001 Y 2.999 al 5 o 12 Transparent ceramic fluorescent m...

Embodiment 2

[0015] Example 2 is used to prepare cerium and chromium co-doped yttrium aluminum garnet transparent ceramic fluorescent material

[0016] Using commercial cerium oxide (CeO) with a purity of 99.999% 2 ), yttrium oxide (Y 2 o 3 ), chromium oxide (Cr 2 o 3 ) and alumina (Al 2 o 3 ) powder, press Ce 0.001 Cr 0.001 Y 2.998 al 5 o 12 The composition and configuration of the powder raw materials are 30g in total, add 0.7wt% tetraethyl orthosilicate (TEOS) with a silicon oxide content ≥ 28.4%, 0.8wt% MgO with a purity of 99.99% as additives, and grind the powder by ball milling and other means Mixing and refinement, the powder is dried and then granulated and tableted; then it is pressed into a green body with a cold isostatic pressure above 200MPa, and then pre-fired to remove organic components; finally put into a hot-pressed sintering furnace Sintering at 1400℃ for 2 hours under 30MPa, the vacuum degree in the sintering and holding stage is better than 2.5×10 -3 Pa, t...

Embodiment 3

[0017] Example 3 is used to prepare cerium and gadolinium co-doped yttrium aluminum garnet transparent ceramic fluorescent material

[0018] Using commercial cerium oxide (CeO) with a purity of 99.9% 2 ), yttrium oxide (Y 2 o 3 ), gadolinium oxide (Gd 2 o 3 ) and alumina (Al 2 o 3 ) powder, press Ce 0.001 Y 2.899 Gd 0.01 al 5 o 12 The composition and configuration of the powder raw materials are 30g in total, add 0.5wt% tetraethyl orthosilicate (TEOS) with a silicon oxide content ≥ 28.4%, 0.1wt% MgO with a purity of 99.999% as additives, and grind the powder by means of ball milling Mixing, refinement, granulation and tableting after drying the powder; then apply a cold isostatic pressure above 200MPa to press it into a green body, then pre-fire to remove organic components; finally put it into a vacuum sintering furnace at 1650°C After sintering for 10 hours, the vacuum degree in the sintering and heat preservation stage is better than 1.0×10 -3 Pa, Ce with dense ...

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Abstract

The invention relates to a sintering aid for yttrium aluminum garnet-based fluorescent transparent ceramic and a using method thereof. The sintering aid particularly comprises tetraethoxysilane and magnesium oxide, wherein the using amount of the tetraethoxysilane with the silicon oxide content of not less than 28.4 percent is 0.3 to 0.7 weight percent of the garnet-based transparent ceramic fluorescent powder raw material; and the using amount of the magnesium oxide with the purity of not less than 99.9 percent is 0.01 to 0.8 weight percent of the garnet-based transparent ceramic fluorescent powder raw material. The garnet-based transparent ceramic fluorescent material prepared from the sintering aid has a compact microstructure and is uniform in crystallite dimension distribution.

Description

technical field [0001] The invention relates to garnet-based transparent ceramics, in particular to a sintering aid for preparing garnet-based transparent ceramic fluorescent materials and a use method thereof. Background technique [0002] Phosphor conversion light-emitting diodes (hereinafter referred to as LEDs) are the mainstream technical route of commercial white light LEDs at present, and their specific implementation form is white light emission realized by mixing Ce:YAG phosphors after excitation by GaInN blue light LEDs. Because this kind of white light LED is usually packaged by mixing Ce:YAG phosphor powder into epoxy resin or silica gel, and the heat dissipation performance of these two organic packaging materials is poor and easy to age, so that the luminous efficiency of the device seriously decays over time. . In recent years, since transparent ceramic fluorescent materials can avoid or reduce the use of organic packaging materials, they can greatly reduce t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/632C04B35/44C04B35/50
Inventor 周圣明林辉滕浩
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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