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High Collection Efficiency Achieved by Photonic Crystal Off- \Gamma Diffractions in Microsized Thin-Film GaN Light-Emitting Diodes

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4 Author(s)
Ying-Chien Chu ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Yan-Kuin Su ; Chia-Hsin Chao ; Yeh, Wen-Yung

Based on the off-Γ diffractions from a square photonic crystal (PhC), a flat-top far-field profile is achieved in a microsized thin-film light-emitting diode (mTFLED) for higher light-collection efficiency. The PhC mTFLED with a lattice constant of 370 nm and hole depth of 80 nm exhibits two diffractions at ±12°, resulting in a flat-top far-field profile. The off-Γ diffractions improve light-collection efficiency from 6.57% to 10.79% within a ±15° extraction cone. In addition, the light output power of the PhC mTFLED is 2.93 times than that of nonPhC mTFLED.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 18 )