Abstract

Nitride-based light-emitting diodes (LEDs) with a backside reflector combining a SiO$_{2}$/TiO$_{2}$ distributed Bragg reflector (DBR) and an Ag mirror were simulated and fabricated. With combining the three-pair SiO$_{2}$/TiO$_{2}$ 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$^{\circ}$. 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${+}3$DBR mirror, with an Ag mirror, and with Ag${+}3$DBR mirror, respectively.

© 2011 IEEE

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