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Proceedings Paper

Optical concentrators for light-emitting diodes
Author(s): Tim Ashley; David T. Dutton; Charles Thomas Elliott; Neil T. Gordon; T. J. Phillips
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Paper Abstract

The incorporation of non-imaging optical concentrations in uncooled mid-IR LEDs is described. Novel micromachining methods are used to produce optical concentrators in the growth substrate of epitaxial InSb/InAlSb heterostructures. Resultant large area LED arrays, displaying both positive and negative luminescence, are shown to have optical gains of 3.5 over conventional mesas made form the same material. The LED technology shown also relies on the micromachined substrate being transparent to 3-5 micrometers radiation and to act as a low resistance common contact. The use of degenerate doping in InSb is described, resulting in a shift in the room-temperature transmission to the 3-5micrometers atmospheric window and providing high electrical conductivities.

Paper Details

Date Published: 20 April 1998
PDF: 8 pages
Proc. SPIE 3289, Micro-Optics Integration and Assemblies, (20 April 1998); doi: 10.1117/12.305488
Show Author Affiliations
Tim Ashley, Defence Evaluation and Research Agency (United Kingdom)
David T. Dutton, Defence Evaluation and Research Agency (United Kingdom)
Charles Thomas Elliott, Defence Evaluation and Research Agency (United Kingdom)
Neil T. Gordon, Defence Evaluation and Research Agency (United Kingdom)
T. J. Phillips, Defence Evaluation and Research Agency (United Kingdom)

Published in SPIE Proceedings Vol. 3289:
Micro-Optics Integration and Assemblies
Michael R. Feldman; Yung-Cheng Lee, Editor(s)

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