Estimating junction temperature of high-flux white LEDs

Nadarajah Narendran; Yimin Gu; R. Hosseinzadeh

doi:10.1117/12.537628

21 June 2004 Estimating junction temperature of high-flux white LEDs

Nadarajah Narendran, Yimin Gu, R. Hosseinzadeh

Proceedings Volume 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII; (2004) https://doi.org/10.1117/12.537628
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

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.

Citation Download Citation

Nadarajah Narendran, Yimin Gu, and R. Hosseinzadeh "Estimating junction temperature of high-flux white LEDs", Proc. SPIE 5366, Light-Emitting Diodes: Research, Manufacturing, and Applications VIII, (21 June 2004); https://doi.org/10.1117/12.537628

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