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Modifying the improved light-output intensity of AlGaInP-based LEDs by nanoporous alimina

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6 Author(s)
Chien-Chun Wang ; Inst. of Electro-Opt. Sci. & Eng., Nat. Cheng-Kung Univ., Tainan ; Chien-Chih Liu ; Kwok-Keung Chong ; Chen-I Hung
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This investigation describes the development of AlGaInP light-emitting diodes (LEDs) with a nanometer diameter of porous anodic alumina (PAA) films which are formed by anodization technique to improve and modify the light extraction efficiency. The pore-widening time was changed for surface modulation to obtain the optimum light extraction efficiency. The diameter of nano-pores varies from 30 nm to 60 nm and the interpore spacing is about 75 nm. The light output intensity of the PAA LEDs with 40 minutes pore-widening is 1.39 times that of conventional LEDs. PAA films can effectively reduce critical angle loss, Fresnel loss and be used as scattering center to improve the light extraction.

Published in:

Indium Phosphide and Related Materials, 2008. IPRM 2008. 20th International Conference on

Date of Conference:

25-29 May 2008

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