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Emission characteristics of photonic crystal light-emitting diodes

Khokhar, Ali Z. and Parsons, Keith and Hubbard, Graham and Watson, Ian M. and Rahman, Faiz and MacIntyre, Douglas S and Xiong, Chang and Massoubre, David and Gong, Zheng and Gu, Erdan and Johnson, Nigel P. and De La Rue, Richard M. and Dawson, Martin D. and Abbott, Steve J. and Charlton, Martin D.B. and Tillin, Martin (2011) Emission characteristics of photonic crystal light-emitting diodes. Applied Optics, 50 (19). pp. 3233-3239. ISSN 1559-128X

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Abstract

Experimentally measured optical properties of photonic crystal LEDs are reported here. Photonic crystal and photonic quasi-crystal structures were fabricated on GaN epilayer LED wafer material using both direct-write electron beam lithography and nanoimprint lithography. Some of these structures were processed to make finished LEDs. Both electroluminescence and photoluminescence measurements were performed on these structures. Devices were characterized for their current-voltage characteristics, emission spectra, far-field emission pattern, and angular emission pattern. These results are useful for fabricating photonic crystal LEDs and assessing their operational properties.