
Proceedings Paper
Optimisation of pattern geometry and investigations of physical mechanisms contributing to improved light extraction in patterned substrate LEDsFormat | Member Price | Non-Member Price |
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Paper Abstract
In this paper we investigate the use of a patterned layer placed at the substrate / GaN interface region of a p-side
up LED to improve light extraction and investigate the optimization of performance geometry by adjustment of
geometrical parameters associated with the shaped structures including: side wall angle, side wall curvature, height and
lattice constant. Performance is in each case evaluated in terms of angular extraction efficiency and far field angular
beam profile. Comparisons are made between conventional large pitch patterned substrate (PSS) designs which have
multiple wavelength length scales, and photonic crystal lattices which have a (sub) wavelength length scale. Physical
mechanisms giving rise to the improvements are identified and discussed in each case. Overall a maximum improvement
in extraction efficiency of 66% was obtained for a 4500nm pitch lattice of truncated cones.
Paper Details
Date Published: 9 February 2011
PDF: 11 pages
Proc. SPIE 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV, 795419 (9 February 2011); doi: 10.1117/12.874187
Published in SPIE Proceedings Vol. 7954:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)
PDF: 11 pages
Proc. SPIE 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV, 795419 (9 February 2011); doi: 10.1117/12.874187
Show Author Affiliations
Martin D. B. Charlton, Univ. of Southampton (United Kingdom)
Sean Linn, Unilite/Luxtaltek Corp. (Taiwan)
Published in SPIE Proceedings Vol. 7954:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)
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