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Investigation of the peak power enhancement available from a surface emitting GaAlAs near-infrared light emitting diode by cooling and pulsing

Investigation of the peak power enhancement available from a surface emitting GaAlAs near-infrared light emitting diode by cooling and pulsing
Investigation of the peak power enhancement available from a surface emitting GaAlAs near-infrared light emitting diode by cooling and pulsing
Light emitting diode (LED) light sources are required for many illumination and optical sensing applications, due to their compact dimensions, low cost and low power consumption. The optimization of optical power output in a specific wavelength band is often of critical importance. We are interested in using LEDs for optical sensing systems, particularly for gas sensing. We have conducted a very comprehensive engineering study to show that, by packaging a commercial surface emitting LED in a cooled heat-sunk package and optimizing the drive current for this lower temperature, the power from the LED may be substantially improved, particularly when pulsed at low duty cycle. We have found that, even with moderate cooling using a Peltier heat pump, the intensity in our required spectral band was improved by a factor of 5 compared to that attainable under normal drive conditions. We have also verified that almost all spectral changes in the LED were due to temperature changes in the emitting chip, rather than from other effects related to injection current, such as internal optical gain.
0957-0233
2006-2014
Chambers, P.
acc1a1f9-dbc8-4d5e-8982-1843cb1beda7
Austin, E.A.
5e62fbb2-313b-4368-a371-2d8cb7978109
Gunning, M.J.
f794096b-506a-46e1-91ae-3eb905b5b56b
Dakin, J.P.
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Chambers, P.
acc1a1f9-dbc8-4d5e-8982-1843cb1beda7
Austin, E.A.
5e62fbb2-313b-4368-a371-2d8cb7978109
Gunning, M.J.
f794096b-506a-46e1-91ae-3eb905b5b56b
Dakin, J.P.
04891b9b-5fb5-4245-879e-9e7361adf904

Chambers, P., Austin, E.A., Gunning, M.J. and Dakin, J.P. (2003) Investigation of the peak power enhancement available from a surface emitting GaAlAs near-infrared light emitting diode by cooling and pulsing. Measurement Science and Technology, 14 (11), 2006-2014. (doi:10.1088/0957-0233/14/11/020).

Record type: Article

Abstract

Light emitting diode (LED) light sources are required for many illumination and optical sensing applications, due to their compact dimensions, low cost and low power consumption. The optimization of optical power output in a specific wavelength band is often of critical importance. We are interested in using LEDs for optical sensing systems, particularly for gas sensing. We have conducted a very comprehensive engineering study to show that, by packaging a commercial surface emitting LED in a cooled heat-sunk package and optimizing the drive current for this lower temperature, the power from the LED may be substantially improved, particularly when pulsed at low duty cycle. We have found that, even with moderate cooling using a Peltier heat pump, the intensity in our required spectral band was improved by a factor of 5 compared to that attainable under normal drive conditions. We have also verified that almost all spectral changes in the LED were due to temperature changes in the emitting chip, rather than from other effects related to injection current, such as internal optical gain.

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More information

Published date: 2003
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 13851
URI: https://eprints.soton.ac.uk/id/eprint/13851
ISSN: 0957-0233
PURE UUID: 5cf2191e-9f4e-4ff4-a3bc-31b645196948

Catalogue record

Date deposited: 18 Jan 2005
Last modified: 11 Jan 2019 17:30

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