標題: Influence of the microstructure geometry of patterned sapphire substrates on the light extraction efficiency of GaN LEDs
作者: Kuo, Chien-Ting
Hsu, Lung-Hsing
Huang, Bo-Hsin
Kuo, Hao-Chung
Lin, Chien-Chung
Cheng, Yuh-Jen
光電系統研究所
照明與能源光電研究所
光電工程學系
Institute of Photonic System
Institute of Lighting and Energy Photonics
Department of Photonics
公開日期: Sep-2016
摘要: The influence of the microstructure geometry of patterned sapphire substrates (PSS) on the light extraction efficiency (LEE) of GaN light-emitting diodes (LEDs) is numerically analyzed. Cone structures of various dimensions are studied, along with dome and mixed microstructures. LEE is found to mainly depend on the microstructure surface slope. LEE rises quickly with slope and flattens out when the slope exceeds 0.6. Scaling down the microstructure has little effect on LEE. Light rays are found to travel longer distances in PSS LEDs, as compared with LEDs grown on a flat substrate. Keeping GaN absorption loss low is important for LEE optimization. (C) 2016 Optical Society of America
URI: http://dx.doi.org/10.1364/AO.55.007387
http://hdl.handle.net/11536/134260
ISSN: 1559-128X
DOI: 10.1364/AO.55.007387
期刊: APPLIED OPTICS
Volume: 55
Issue: 26
起始頁: 7387
結束頁: 7391
Appears in Collections:Articles