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Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Sub-micron inGaN ring structures for high-efficiency LEDs

Choi, H.W. and Edwards, P.R. and Liu, C. and Jeon, C.W. and Martin, R.W. and Watson, I.M. and Dawson, M.D. and Tripathy, P. and Chua, S.J. (2004) Sub-micron inGaN ring structures for high-efficiency LEDs. Physica Status Solidi C, 1 (2). pp. 202-205. ISSN 1862-6351

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Abstract

A novel technique based on the Fresnel diffraction effect for the fabrication of sub-micron ring structures in InGaN/GaN multi-quantum well structures has been demonstrated. The ring structures have an external diameter of 1.5 m and a wall width of 500 nm. A 1 cm-1 Raman shift has been measured, signifying substantial strain relaxation from the fabricated structure. The 5 nm blue shift observed in the cathodoluminescence spectra can be attributed to band-filling and/or screening of the piezoelectric field. A light emitting diode based on this geometry has been demonstrated.