Absorbance measurements with light-emitting diodes as sources: Silicon photodiodes or light-emitting diodes as detectors?
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2310247
Author(s) Anh Bui, Duy; Hauser, Peter C
Author(s) at UniBasel Hauser, Peter C.
Year 2013
Title Absorbance measurements with light-emitting diodes as sources: Silicon photodiodes or light-emitting diodes as detectors?
Journal Talanta
Volume 116
Pages / Article-Number 1073-8
Abstract

Light-emitting diodes may also serve as light detectors, and the combination of two of these devices, one serving as light source, the other for detection, has been reported repeatedly for use in analytical photometry. A comparative study of the performance of light-emitting diodes in this role and that of a standard photodiode is reported herein. The spectral sensitivities of the light-emitting diodes were found to be as narrow as their emission bands, but shifted to shorter wavelengths, so that the spectral overlaps between emission and sensitivity of the same devices are very limited. The photocurrents of the light-emitting diodes were found to be about ten times lower than those of the photodiode. In the discharge mode (the time for discharge of the p/n-junction by the photocurrent is measured) as well as the photovoltaic mode, both of which had previously been reported for light-emitting diodes used as detectors in photometric devices, the performance of a light-emitting diode was on a level that is adequate for many analytical purposes, but the photodiode generally gave better precision and the signals showed faster settling times.

Publisher Pergamon Press
ISSN/ISBN 0039-9140
edoc-URL http://edoc.unibas.ch/dok/A6212112
Full Text on edoc No
Digital Object Identifier DOI 10.1016/j.talanta.2013.08.007
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/24148518
ISI-Number WOS:000328176000155
Document type (ISI) Journal Article
 
   

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