Effects of electro-thermal conditions on luminous efficacies of phosphor-converted white light emitting diodes

Shailesh, K R (2018) Effects of electro-thermal conditions on luminous efficacies of phosphor-converted white light emitting diodes. In: International Conference on Computational Techniques, Electronics and Mechanical Systems, 21/12/2018, KLS Gogte Institute of Technology, Belgavi,India.

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Abstract

In this work the effect of prevailing electrical and thermal conditions on the luminous of efficacy of radiation and wall-plug efficiency of phosphor-converted white LEDs is discussed. For this study, LED manufactured by a reputed lighting company is used. Previous studies have modeled the spectral power distribution of white-pc LEDs as a function of the temperature and electrical characteristics. Results from the study confirm that the nature of spectral power distribution does not change with electrical or thermal conditions thereby giving constant luminous efficacy of radiation. However, it is found from the study that there is significant effect of electro-thermal conditions on the luminous efficacy of the system, with wall-plug efficiency decreasing drastically with increased forward current. However, it must be noted that effect of thermal conditions is comparatively less on the working of white-pc LED compared to the effect of electrical conditions. Spectral power distributions are obtained for different electro-thermal combinations, and they indicate that nature of the spectral power distribution remains same irrespective of the prevailing electro-thermal conditions.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: current, Junction temperature, light emitting diodes, optical power, radiant flux, spectral analysis, thermal, voltage, white
Subjects: Engineering > MIT Manipal > Electrical and Electronics
Depositing User: MIT Library
Date Deposited: 09 Jan 2019 05:35
Last Modified: 09 Jan 2019 05:35
URI: http://eprints.manipal.edu/id/eprint/152767

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