Abstract

Nitride-based light-emitting diodes (LEDs) with a hybrid backside reflector combining a ${\hbox {TiO}} _{2} /{\hbox {SiO}}_{2}$ distributed Bragg reflector (DBR) and an Al mirror were proposed and realized. It was found that we can significantly enhance the 35% reflectivity of the 2-pair ${\hbox {TiO}} _{2} /{\hbox {SiO}}_{2}$ DBR to 94% by combining with Al mirror (hybrid reflector). Furthermore, reflectivity of the proposed reflector depends only slightly on incident light wavelength and the incident angle. With 350-mA current injection, it was found that the output powers were 145.7, 178.2, and 201.9 mW for the LEDs with 2-pair DBR, with an Al mirror and with a hybrid reflector, respectively, when packaged in TO-cups. It was also found that reliability for the LED with the hybrid reflector is good.

© 2008 IEEE

High performance GaN-based LEDs on patterned sapphire substrate with patterned composite SiO₂/Al₂O₃ passivation layers and TiO₂/Al₂O₃ DBR backside reflector

Hao Guo, Xiong Zhang, Hongjun Chen, Peiyuan Zhang, Honggang Liu, Hudong Chang, Wei Zhao, Qinghua Liao, and Yiping Cui
Opt. Express 21(18) 21456-21465 (2013)

Enhanced luminous efficiency of phosphor-converted LEDs by using back reflector to increase reflectivity for yellow light

Shengjun Zhou, Bin Cao, Shu Yuan, and Sheng Liu
Appl. Opt. 53(34) 8104-8110 (2014)

Reflectance bandwidth and efficiency improvement of light-emitting diodes with double-distributed Bragg reflector

Xinghuo Ding, Chengqun Gui, Hongpo Hu, Mengling Liu, Xingtong Liu, Jiajiang Lv, and Shengjun Zhou
Appl. Opt. 56(15) 4375-4380 (2017)

Microscale hemisphere patterned backside mirror for GaN-based light-emitting diodes

Huamao Huang, Haiying Hu, Hong Wang, and Kuiwei Geng
Appl. Opt. 54(33) 9791-9798 (2015)

Comparative study of Laser induce damage of HfO₂/SiO₂ and TiO₂/SiO₂ mirrors at 1064 nm

Hongfei Jiao, Tao Ding, and Qian Zhang
Opt. Express 19(5) 4059-4066 (2011)