Zhang Z.-H., Chu C., Tian K., Zhang Y. Deep Ultraviolet LEDs: Understanding the Low External Quantum Efficiency

Springer, 2019. — 72 p. — (SpringerBriefs in Applied Sciences and Technology). — ISBN: 978-981-13-6179-1.AlGaN-based deep ultraviolet light-emitting diodes (DUV LEDs) are featured with small size, DC driving, no environmental contamination, etc., and they are now emerging as the excellent solid-state light source to replace the conventional mercury-based light tubes. This book highlights the origin of low external quantum efficiency for deep ultraviolet light-emitting diodes (DUV LEDs). In addition, it puts forward solutions for increasing the internal quantum efficiency and the light extraction efficiency of DUV LEDs. The book chiefly concentrates on approaches that can be used to improve the crystalline quality, increase carrier injection, reduce the polarization-induced electric field within multiple quantum wells, suppress the TM polarization emission, and enhance the light escape from the semiconductor layer. It also demonstrates insightful device physics for DUV LEDs, which will greatly benefit the optoelectronic community.
Readership: Photonics and solid state circuits/electronics community.