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Nitride-Based LEDs With a Hybrid Al Mirror + {\hbox {TiO}} _{2} /{\hbox {SiO}}_{2} DBR Backside Reflector

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7 Author(s)
Chang, S.J. ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan ; Shen, C.F. ; Hsieh, M.H. ; Kuo, C.T.
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Nitride-based light-emitting diodes (LEDs) with a hybrid backside reflector combining a TiO2/SiO2 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 TiO2/SiO2 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.

Published in:

Lightwave Technology, Journal of  (Volume:26 ,  Issue: 17 )

Date of Publication:

Sept.1, 2008

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