Abstract
The light extraction efficiency of side-view light-emitting diodes (LEDs) with a textured encapsulant top surface is analyzed theoretically and experimentally. A prism-type textured surface is proposed in order to increase the extraction efficiency, which is calculated by ray-tracing simulations. According to the simulation results, extraction efficiency can be enhanced by up to 35% compared with that of conventional LEDs. By using an imprinting technique to texture the encapsulant top surface, a prism-structure array has been fabricated. The experimental enhancement of light extraction efficiency is 14% for blue LEDs and 10% for white LEDs.
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