Date

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[P1-106]
14:00 ~ 15:30
Title:Improvement of Light Emitting Efficiency on Flip Chip LED with Patterned Sapphire Substrate
Hyun Jung Park, Dong Kyu Lee, Yu-Jung Cha, and Joon Seop Kwak (Sunchon Nat'l Univ., Korea)
Abstract: Recently, one of the technologies that gained the most interest is patterned sapphire substrate (PSS), is forming patterns on the sapphire surface. It brings effectiveness that reduce the probability to generate the total internal reflection(TIR) and increase probability to transmit at the interface between n-GaN and sapphire of the light spreads out in Multi Quantum Wells(MQW). In addition, light is refracted at various angles due to the diffuse reflection effect of PSS. In conclusion it improves the light extraction efficiency. In order to check the light extraction efficiency change of the flip chip LED, we designed and simulated the flip chip LED with hemispherical PSS, the parameters for simulation are arrangement, edge spacing, radius and height using LightTools program. Also, PSS shape was designed and simulated with cone, pyramid and cylinder etc. The results show that the light extraction efficiency of 16.76% for flip chip LED without PSS waw enhanced to 56.29% by the application of the optimized PSS to the flip chip LED. In addition, SiO2 material was applied to PSS and it��s influence was checked.
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