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Proceedings Paper

Enhancing the light extraction efficiency of GaN-based LEDs
Author(s): Pingjuan Niu; Yanling Li; Xiaoyun Li
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Paper Abstract

GaN-based light-emitting diode (LED) has been widely used in recent years, and tremendous progress has been achieved in GaN-based semiconductor materials and relevant process. However, owing to the large refractive index contrast between GaN-based semiconductor materials and air, light can be easily totally internally reflected at the semiconductor/air interface, and the critical angle for light to escape from the semiconductor is small. Therefore, the light extraction efficiency for GaN-based LED is still low and needs improving. Some of the leading approaches to enhance light extraction efficiency of GaN-based LED such as surface texturing or roughening, omnidirectional reflectors, photonic crystals, laser liftoff, transparent electrode, patterned substrate and so on are introduced in detail. For each approach, how the variation in device structure or material improves the light extraction efficiency is analyzed thoroughly. At last, some of mentioned approaches that are promising are evaluated and viewed briefly.

Paper Details

Date Published: 20 November 2007
PDF: 11 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 682811 (20 November 2007); doi: 10.1117/12.760227
Show Author Affiliations
Pingjuan Niu, Tianjin Polytechnic Univ. (China)
Yanling Li, Tianjin Polytechnic Univ. (China)
Xiaoyun Li, Tianjin Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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