Deep Ultraviolet LEDs: Understanding the Low External Quantum Efficiency

Description

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. Front Matter ....Pages i-ix Introduction (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 1-3 Increase the IQE by Improving the Crystalline Quality for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 5-7 Improve the Current Spreading for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 9-10 Improve the Hole Injection to Enhance the IQE for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 11-31 Enhance the Electron Injection Efficiency for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 33-42 Screen the Polarization Induced Electric Field Within the MQWs for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 43-57 Thermal Management for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 59-60 The Light Extraction Efficiency for DUV LEDs (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 61-65 Conclusions and Outlook (Zi-Hui Zhang, Chunshuang Chu, Kangkai Tian, Yonghui Zhang)....Pages 67-68 Back Matter ....Pages 69-69