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Proceedings Paper

Applications of deep UV LEDs to chemical and biological sensing
Author(s): Purnendu K. Dasgupta; Qingyang Li; Henryk Temkin; Mary Hagerott Crawford; Arthur J. Fischer; Andrew A. Allerman; Katherine H. A. Bogart; Stephen R. Lee
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Paper Abstract

An AlGaN Light-emitting diode (LED) emitting with a peak wavelength at 291 nm and a radiant power of 0.5 mW @ 100 mA was fabricated on a sapphire substrate. A compact gated fluorescence detection system was built using this LED as the excitation light source. We demonstrate that it provides sufficient power using Terbium enhanced fluorescence to detect subnanomolar concentrations of dipicolinic acid (DPA, 2, 6-pyridinedicarboxylic acid), a substance uniquely present in bacterial spores such as that from B. anthracis, providing a basis for convenient early warning detectors. We also describe initial results from a novel approach for biological aerosol detection using long lived fluorescence from a Europium tagged dye that binds to proteins.

Paper Details

Date Published: 20 October 2004
PDF: 8 pages
Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); doi: 10.1117/12.567106
Show Author Affiliations
Purnendu K. Dasgupta, Texas Tech Univ. (United States)
Qingyang Li, Texas Tech Univ. (United States)
Henryk Temkin, Texas Tech Univ. (United States)
Mary Hagerott Crawford, Sandia National Labs. (United States)
Arthur J. Fischer, Sandia National Labs. (United States)
Andrew A. Allerman, Sandia National Labs. (United States)
Katherine H. A. Bogart, Sandia National Labs. (United States)
Stephen R. Lee, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 5530:
Fourth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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