Enhancing the light extraction efficiency of GaN-based LEDs

Pingjuan Niu; Yanling Li; Xiaoyun Li

doi:10.1117/12.760227

20 November 2007 Enhancing the light extraction efficiency of GaN-based LEDs

Pingjuan Niu, Yanling Li, Xiaoyun Li

Proceedings Volume 6828, Light-Emitting Diode Materials and Devices II; 682811 (2007) https://doi.org/10.1117/12.760227
Event: Photonics Asia 2007, 2007, Beijing, China

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.

Citation Download Citation

Pingjuan Niu, Yanling Li, and Xiaoyun Li "Enhancing the light extraction efficiency of GaN-based LEDs", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 682811 (20 November 2007); https://doi.org/10.1117/12.760227

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available