A Novel Liquid Packaging Structure of Deep-Ultraviolet Light-Emitting Diodes to Enhance the Light-Extraction Efficiency

• DOI: 10.3390/cryst9040203
• Publication Date: 2019-04-12T16:55:04Z
• Authors: Chieh-Yu Kang; Chih-Hao Lin; Tingzhu Wu; Po-Tsung Lee; Zhong Chen; Hao-Chung Kuo
• Keywords: Ultraviolet

To realize high-efficiency, AlGaN-based, deep-ultraviolet light-emitting diodes (DUV-LEDs), enhancing their light-extraction efficiency and reducing thermal resistance is very crucial. We proposed a liquid packaging structure that could enhance optical power by 27.2% 70.7% for flat type lens 281-nm DUV-LEDs, respectively. A significant improvement effect at different wavelengths, such as 268 nm 310 nm, was also observed. Furthermore, using the structure, reduced 30.3% compared to conventional structure. Finally, reliability of DUV-LEDs tested. The light output maintenance