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Nonintrusive Measurement Of Temperature Of LED JunctionTemperature inferred from spectrum of emitted light. Method of determining temperature of junction based on two relevant characteristics of LED. Gap between valence and conduction electron-energy bands in LED material decreases with increasing temperature, causing wavelength of emitted photon to increase with temperature. Other, as temperature increases, non-radiative processes dissipate more of input electrical energy as heat and less as photons in band-gap wavelenth region; optical and quantum efficiencies decrease with increasing temperature. In principal, either characteristic alone used to determine temperature. However, desirable to use both to obtain indication of uncertainty.
Document ID
19910000087
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Leidecker, Henning
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Powers, Charles
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 14, 2013
Publication Date
March 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 3
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
GSC-13339
Accession Number
91B10087
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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