Abstract
The enhancement of light extraction efficiency of InGaN quantum well light
emitting diodes (LEDs) was achieved by employing the refractive index matched
TiO<sub>2</sub> microsphere arrays. The optimization studies of the dipping method
and rapid convective deposition (RCD) method were carried out for the deposition of
TiO<sub>2</sub> microsphere arrays onto LEDs. The two-dimensional (2D) close-packed
TiO<sub>2</sub> microsphere arrays were deposited by the using optimized conditions
of the dipping and RCD methods, respectively. The light extraction efficiencies of LEDs
under electrical injection were enhanced by 1.8–1.9 times by utilizing 520-nm diameter
amorphous and anatase TiO<sub>2</sub> microspheres via the two deposition
methods.
© 2013 IEEE
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