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: | 九月-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 |
顯示於類別: | 期刊論文 |