Article

Enhanced Light Extraction by Photonic Quasi-Crystals in GaN Blue LEDs

Univ. of Bath, Bath, UK
IEEE Journal of Selected Topics in Quantum Electronics (impact factor: 3.78). 09/2009; DOI:10.1109/JSTQE.2009.2016674
Source: IEEE Xplore

ABSTRACT The far-field profile of photonic quasi-crystal patterned and unpatterned LEDs, fabricated from commercial epitaxial substrates by electron beam lithography, has been measured prior to lapping and dicing. Emission enhancements reach a maximum of 62%, and are strongly dependent on the filling factor. Qualitative agreement is achieved between 2-D finite-difference time-domain calculations and the experimental data.

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Keywords

2-D finite-difference time-domain calculations
 
commercial epitaxial substrates
 
electron beam lithography
 
Emission enhancements
 
far-field profile
 
filling factor
 
Qualitative agreement