High-performance Al2O3-YAG:Ce composite ceramic phosphors for miniaturization of high-brightness white light-emitting diodes

被引：39

作者：

Zhao, Huanyu ^{[1
]}

Li, Zhi ^{[2
]}

Zhang, Mengwen ^{[1
]}

Li, Jinsheng ^{[1
]}

Wu, Minbo ^{[1
]}

Li, Xiaodong ^{[1
]}

Chen, Jialin ^{[3
]}

Xie, Ming ^{[3
]}

Li, Junpeng ^{[3
]}

Sun, Xudong ^{[1
,2
]}

机构：

[1] Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China

[2] Dalian Univ, Coll Environm & Chem Engn, Liaoning Engn Lab Special Opt Funct Crystals, Dalian 116622, Peoples R China

[3] Kunming Inst Precious Met, State Key Lab Adv Technol Comprehens Utilizat Pla, Kunming 650106, Yunnan, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Thermal conductivity; Al2O3-YAG:Ce; Ceramic phosphor; WLED; HIGH-POWER LEDS; THERMAL-CONDUCTIVITY; TRANSPARENT CERAMICS; MICROSTRUCTURE; EFFICIENCY; STABILITY; LUMINESCENCE; CONVERTER; EXPANSION; Y3AL5O12;

D O I：

10.1016/j.ceramint.2019.09.017

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The miniaturization of high-brightness white light-emitting diodes (WLEDs) is limited by the low thermal performance of phosphors. In this study, the microstructure, optical properties, and thermal performance of Al2O3-Y3Al5O12:Ce3+ (Al2O3-YAG:Ce) composite ceramics fabricated by hot pressing were investigated. By promoting the growth of Al2O3 grains while maintaining a high composite density, thermal performance of the composite ceramics was significantly increased. The thermal conductivity of a Al2O3-40-vol% YAG:Ce ceramic reached 21.8 W/m/K, which is close to the theoretical value. In addition, this composite ceramic exhibited the highest energy efficiency. After packaging with a high-power LED chip with dimensions of 1 mm x 1 mm, a high luminous flux of 639 1m was generated, while the reduction in output power at 250 degrees C was as low as 6%. This indicated excellent high-temperature stability and potential for applications in solid-state lighting.

引用

页码：653 / 662

页数：10

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