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2 September 2005 Enhancement of light extraction in GaN light-emitting diodes by omni-directional reflectors with ITO nanorod low-refractive-index layer
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Abstract
Enhancement of light extraction in GaN light-emitting diodes (LEDs) employing omnidirectional reflectors (ODRs) is presented. The ODR consists of GaN, ITO nanorod low-refractive-index layer, and an Ag layer. An array of ITO nanorods is deposited by oblique-angle deposition using e-beam evaporation. The refractive index of the ITO nanorods is 1.34 at 461 nm, significantly lower that that of dense ITO, which is n = 2.06 at 461 nm. It is experimentally shown that the GaN LED with GaN/ITO nanorods/Ag ODR show much better electrical properties and higher light-extraction efficiency than LEDs with Ag contact. This is attributed to enhanced reflectivity of the ODR by using an ITO low-refractive-index layer with high transparency, high conductivity, and low refractive index.
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Jong Kyu Kim, J.-Q. Xi, Hong Luo, Jaehee Cho, Cheolsoo Sone, Yongjo Park, and E. Fred Schubert "Enhancement of light extraction in GaN light-emitting diodes by omni-directional reflectors with ITO nanorod low-refractive-index layer", Proc. SPIE 5941, Fifth International Conference on Solid State Lighting, 59410K (2 September 2005); https://doi.org/10.1117/12.621871
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