TITLE

Directional light extraction enhancement from GaN-based film-transferred photonic crystal light-emitting diodes

AUTHOR(S)
Lai, Chun-Feng; Chao, Chia-Hsin; Kuo, Hao-Chung; Yen, His-Hsuan; Lee, Chia-En; Yeh, Wen-Yung
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p123106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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° collection cone, collected light was enhanced by a factor of ∼2.4 for the collimated PhC FTLED.
ACCESSION #
37259571

 

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