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A novel LED module for the detection of H2S at 3.8 mu m. .

Krier, A. and Sherstnev, V. V. and Gao, H. H. (2000) A novel LED module for the detection of H2S at 3.8 mu m. . Journal of Physics D-Applied Physics, 33 (14). pp. 1656-1661. ISSN 0022-3727

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Abstract

A new type of mid-infrared LED module (LEDM) operating at 3.8 mu m is reported. The device was produced using liquid phase epitaxy (LPE) and consists of a series array of four individual LED chips. Electro-optic characteristics of the devices were measured and are reported here. The output power from the module was measured to be as high as 8 mW at room temperature under pulsed drive conditions. Compared with previous results our LED and LEDM devices represent a considerable improvement in output power at 3.8 mu m. The reasons for this improvement are related to the purification techniques used in the LPE growth procedure and the de-tuning of the CHSH Auger resonance in the InAs0.95Sb0.05 alloy which forms the active region. The peak in the electroluminescence emission spectrum was found to be co-incident with the absorption band of H2S gas and as such we were able to demonstrate substantial optical absorption which clearly shows the potential application of such devices in infrared gas sensor instrumentation.

Item Type: Article
Journal or Publication Title: Journal of Physics D-Applied Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 4478
Deposited By: Dr Susan E. Krier
Deposited On: 18 Mar 2008 13:09
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/4478

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