The flip-chip light-emitting diodes (FC-LEDs) with triple-light scattering layers were investigated comprising a top surface sapphire textured layer, an interface patterned sapphire layer, and a bottom naturally textured p-GaN layer. Such triple-textured layers are useful for light extraction efficiency enhancement. The light output power of FC-LEDs was increased 60% (at 350-mA current injection) compared to that of conventional FC-LEDs by implementing the triple-light scattering layers.
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Lee et al. (2008) studied this question.
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