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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Photonic quasi-crystal light emitting diodes: comparisons of device performance with pattern pitch

Tillin, M. and Charlton, M.D.B. and Gong, Z. and Khokhar, A.Z. and Massoubre, D. and Watson, I.M. and Gu, E. and Dawson, M.D. and Rahman, F. and Johnson, N.P. and Macintyre, D. and De La Rue, R.M. and Parsons, K. and Lin, S. (2010) Photonic quasi-crystal light emitting diodes: comparisons of device performance with pattern pitch. Proceedings of SPIE the International Society for Optical Engineering, 7713. 77130B-1. ISSN 0277-786X

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Abstract

In this paper we discuss theoretical modelling methods for the design of photonic crystal and photonic quasi-crystal (PQC) LEDs - and apply them to the analysis of the extraction enhancement performance and shaping of the emitted beam profile of PQC-LED structures. In particular we investigate the effect of the pitch of the PQC patterning, and consider the physical mechanisms giving rise to performance improvements. In addition, we examine the relative contributions to performance improvements from effective index reduction effects that alter the conditions for total internal reflection at the device air interface, and from photonic crystal scattering effects that give rise to radically improved extraction performance. Comparisons are made with the performance of recently fabricated devices.