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Proceedings Paper

Estimating junction temperature of high-flux white LEDs
Author(s): Nadarajah Narendran; Yimin Gu; R. Hosseinzadeh
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Paper Abstract

Performance of white light LEDs has improved significantly over the past few years. White LEDs are typically created by incorporating a layer of phosphor over the GaN-based blue emitter. Heat at the p-n junction seems to be the major factor that influences light output degradation in these devices. In an earlier paper, the principal authors of this manuscript demonstrated that the junction temperature of white LEDs could be measured from the (W/B) ratio, where W represents the total radiant energy of the white LED spectrum, and B represents the radiant energy within the blue emission peak. In that earlier study, the concept was verified using commercially available 5-mm type white LEDs. The goal of the study presented here was to evaluate whether the (W/B) ratio could be used to estimate junction temperature of new high-flux white LEDs. The results show that (W/B) ratio is proportional to the junction temperature of the high-flux white LED; however, the proportionality constants are different for the different white LED types.

Paper Details

Date Published: 21 June 2004
PDF: 3 pages
Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, (21 June 2004);
Show Author Affiliations
Nadarajah Narendran, Rensselaer Polytechnic Institute (United States)
Yimin Gu, Rensselaer Polytechnic Institute (United States)
R. Hosseinzadeh, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 5366:
Light-Emitting Diodes: Research, Manufacturing, and Applications VIII
Steve A. Stockman; H. Walter Yao; E. Fred Schubert, Editor(s)

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