Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO2 microsphere arrays

Xiao-Hang Li; Yik-Khoon Ee; Renbo Song; Nelson Tansu

doi:10.1117/12.875980

9 February 2011 Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays

Xiao-Hang Li, Yik-Khoon Ee, Renbo Song, Nelson Tansu

Author Affiliations +

Proceedings Volume 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV; 79540U (2011) https://doi.org/10.1117/12.875980
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

The enhancement of light extraction efficiency of InGaN quantum well (QW) light emitting diodes (LEDs) was achieved by employing the refractive index matched TiO₂ microsphere arrays. The optimization studies of the dipping method and rapid convective deposition (RCD) method were carried out for the deposition of TiO₂ microsphere arrays onto LEDs. The 2-dimensional relatively close-packed and close-packed TiO₂ microsphere arrays were deposited by the using optimized conditions of the dipping method and RCD method, respectively. The light extraction efficiencies of LEDs under electrical injection were enhanced by 1.83 times by utilizing 520-nm diameter TiO₂ microspheres. This enhancement is primarily attributed to increase in the effective photon escape cone due to the matched index and spherical shape of TiO2 microstructures arrays.

Citation Download Citation

Xiao-Hang Li, Yik-Khoon Ee, Renbo Song, and Nelson Tansu "Enhancement of light extraction efficiency of InGaN quantum wells light-emitting diodes using TiO₂ microsphere arrays", Proc. SPIE 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV, 79540U (9 February 2011); https://doi.org/10.1117/12.875980

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