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

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