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Nitride-Based LEDs With High-Reflectance and Wide-Angle Ag Mirror {+} SiO _{2} /TiO _{2} DBR Backside Reflector

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3 Author(s)
Nan-Ming Lin ; Inst. of Nanotechnol. & Microsyst. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Shih-Chang Shei ; Shoou-Jinn Chang

Nitride-based light-emitting diodes (LEDs) with a backside reflector combining a SiO2/TiO2 distributed Bragg reflector (DBR) and an Ag mirror were simulated and fabricated. With combining the three-pair SiO2/TiO2 DBR and an Ag mirror, it was found that we can significantly enhance the 96% reflectance of Ag mirror to 99.1% with an incident angle of 0°. Furthermore, reflectance of the proposed reflector depends slightly on incident light wavelength and the incident angle. With 350-mA current injection, it was found that the output powers were 122, 138, 153, 156, and 162 mW for the LEDs without reflector, with an Al mirror, with Al +3DBR mirror, with an Ag mirror, and with Ag+3DBR mirror, respectively.

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Lightwave Technology, Journal of  (Volume:29 ,  Issue: 7 )