NDLI: Characterization of degradation process in white light nitride-based LEDs by low-frequency noise

Content Provider	IEEE Xplore Digital Library
Author	Saulys, B. Palenskis, V. Matukas, J. Pralgauskaite, S. Tylaite, E.
Copyright Year	2011
Description	Author affiliation: Radiophysics Dep., Vilnius University, Sauletekio 9 (III), 10222, Lithuania (Saulys, B.; Palenskis, V.; Matukas, J.; Pralgauskaite, S.) \|\| Newnham College, University of Cambridge, Sidgwick Avenue, CB3 9DF, United Kingdom (Tylaite, E.)
Abstract	Noise characteristics (optical and electrical fluctuations and cross-correlation factor between two noise signals) of high power nitride-based white light emitting diodes (LEDs) have been investigated for initial samples and after accelerated aging. Different spectrum parts from white LED radiation have been investigated separately. Electrical fluctuations and low frequency optical noise of investigated LEDs distinguish by $1/f^{α}-type$ spectrum (above 100 Hz shot noise prevails in optical noise). $1/f^{α}-type$ optical and electrical fluctuations are partly correlated. After accelerated aging optical $1/f^{α}-type$ noise intensity increased, and cross-correlation factor between blue and red light intensity fluctuation increased, too. Origin of increased $1/f^{α}-type$ optical noise is defects in the active layer of investigated white LED, and their increase during aging.
Starting Page	448
Ending Page	451
File Size	1336255
Page Count	4
File Format	PDF
ISBN	9781457701894
e-ISBN	9781457701924
DOI	10.1109/ICNF.2011.5994366
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-12
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Fluctuations Noise Aging Optical variables measurement Electrical noise Light emitting diodes Cross-correlation factor Frequency measurement Optical noise Light emitting diode
Content Type	Text
Resource Type	Article

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