標題: Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes
作者: Lai, Chun-Feng
Chao, Chia-Hsin
Kuo, Hao-Chung
Yen, His-Hsuan
Lee, Chia-En
Yeh, Wen-Yung
光電工程學系
Department of Photonics
關鍵字: gallium compounds;III-V semiconductors;light emitting diodes;photonic crystals;wide band gap semiconductors
公開日期: 23-Mar-2009
摘要: Experimental investigation of the directionality in the far-field pattern and light extraction enhancement in collected cone were performed in GaN-based film-transferred photonic crystal (PhC) light-emitting diodes (FTLEDs). Angular-resolved measurement revealed directional profile and azimuthal anisotropy in the far-field distribution with guided modes extraction. Good agreement according to Bragg's diffraction theory and free photon band structure were achieved. The light enhancement in PhC FTLEDs compared to non-PhC FTLEDs within the collection cone angle was obtained according to measured three-dimensional far-field patterns. In a +/- 20 degrees collection cone, collected light was enhanced by a factor of similar to 2.4 for the collimated PhC FTLED.
URI: http://dx.doi.org/10.1063/1.3106109
http://hdl.handle.net/11536/7469
ISSN: 0003-6951
DOI: 10.1063/1.3106109
期刊: APPLIED PHYSICS LETTERS
Volume: 94
Issue: 12
結束頁: 
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