Design of patterned sapphire substrates for GaN-based light-emitting diodes

A new method for patterned sapphire substrate （PSS） design is developed and proven to be reliable and cost-effective. As progress is made with LEDs＇ luminous efficiency, the pattern units of PSS become more complicated, and the effect of complicated geometrical features is almost impossible to study...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 6; pp. 17 - 24
Main Author 王海燕 林志霆 韩晶磊 钟立义 李国强
Format Journal Article
LanguageEnglish
Published 01.06.2015
Subjects
Design engineering
Extraction
GaN
Light-emitting diodes
Sapphire
光提取效率
发光二极管
图案化
图案设计
基板
实验系统
蓝宝石衬底
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Summary:A new method for patterned sapphire substrate （PSS） design is developed and proven to be reliable and cost-effective. As progress is made with LEDs＇ luminous efficiency, the pattern units of PSS become more complicated, and the effect of complicated geometrical features is almost impossible to study systematically by experiments only. By employing our new method, the influence of pattern parameters can be systematically studied, and various novel patterns are designed and optimized within a reasonable time span, with great improvement in LEDs＇ light extraction efficiency （LEE）. Clearly, PSS pattern design with such a method deserves particular attention. We foresee that GaN-based LEDs on these newly designed PSSs will achieve more progress in the coming years.
Bibliography:A new method for patterned sapphire substrate （PSS） design is developed and proven to be reliable and cost-effective. As progress is made with LEDs＇ luminous efficiency, the pattern units of PSS become more complicated, and the effect of complicated geometrical features is almost impossible to study systematically by experiments only. By employing our new method, the influence of pattern parameters can be systematically studied, and various novel patterns are designed and optimized within a reasonable time span, with great improvement in LEDs＇ light extraction efficiency （LEE）. Clearly, PSS pattern design with such a method deserves particular attention. We foresee that GaN-based LEDs on these newly designed PSSs will achieve more progress in the coming years.
Wang Hai-Yan, Lin Zhi-Ting, Han Jing-Lei, Zhong Li-Yi, and Li Guo-Qiang（ a） State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510641, China b） Department of Electronic Materials, South China University of Technology, Guangzhou 510641, China
light-emitting diode （LED）, patterned sapphire substrate （PSS）, pattern design, computer simula-tion
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/6/067103