Title :
Enhanced Light Extraction by Photonic Quasi-Crystals in GaN Blue LEDs
Author :
Shields, Philip A. ; Charlton, Martin D.B. ; Lee, Tom ; Zoorob, Majd E. ; Allsopp, Duncan W E ; Wang, Wang N.
Author_Institution :
Univ. of Bath, Bath, UK
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.
Keywords :
III-V semiconductors; electroluminescence; electron beam lithography; finite difference time-domain analysis; gallium compounds; light emitting diodes; optical fabrication; optical materials; photonic crystals; wide band gap semiconductors; 2D finite-difference time-domain calculation; blue LED; dicing; electroluminescence; electron beam lithography; enhanced light extraction; epitaxial substrate; lapping; optical fabrication; photonic quasicrystal; Electroluminescence; LEDs; extraction; photonic crystals;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2009.2016674
