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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