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Effect of junction temperature on heat dissipation of high power light emitting diodes

The effect of junction temperature on heat dissipation of high power light emitting diodes (LEDs) is investigated. The theoretical aspect of junction temperature dependency of two major parameters—the forward voltage and the radiant flux—on heat dissipation is reviewed. Actual measurements of the he... Full description

Journal Title: Journal of Applied Physics 28 March 2016, Vol.119(12)
Main Author: Kim, Dae-Suk
Other Authors: Han, Bongtae
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4944800
Link: http://dx.doi.org/10.1063/1.4944800
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recordid: aip_complete10.1063/1.4944800
title: Effect of junction temperature on heat dissipation of high power light emitting diodes
format: Article
creator:
  • Kim, Dae-Suk
  • Han, Bongtae
subjects:
  • Articles
ispartof: Journal of Applied Physics, 28 March 2016, Vol.119(12)
description: The effect of junction temperature on heat dissipation of high power light emitting diodes (LEDs) is investigated. The theoretical aspect of junction temperature dependency of two major parameters—the forward voltage and the radiant flux—on heat dissipation is reviewed. Actual measurements of the heat dissipation over a wide range of junction temperatures are followed to quantify the effect of the parameters using commercially available LEDs. The results show that (1) the effect of the junction temperature dependency on heat dissipation is governed largely by the LED power efficiency and (2) each parameter contributes to the total heat dissipation in an opposite way so that the absolute changes of the heat dissipation are not significant over a wide range of junction temperature. An empirical model of heat dissipation is proposed for applications in practice.
language: eng
source:
identifier: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4944800
fulltext: fulltext
issn:
  • 0021-8979
  • 1089-7550
  • 00218979
  • 10897550
url: Link


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descriptionThe effect of junction temperature on heat dissipation of high power light emitting diodes (LEDs) is investigated. The theoretical aspect of junction temperature dependency of two major parameters—the forward voltage and the radiant flux—on heat dissipation is reviewed. Actual measurements of the heat dissipation over a wide range of junction temperatures are followed to quantify the effect of the parameters using commercially available LEDs. The results show that (1) the effect of the junction temperature dependency on heat dissipation is governed largely by the LED power efficiency and (2) each parameter contributes to the total heat dissipation in an opposite way so that the absolute changes of the heat dissipation are not significant over a wide range of junction temperature. An empirical model of heat dissipation is proposed for applications in practice.
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descriptionThe effect of junction temperature on heat dissipation of high power light emitting diodes (LEDs) is investigated. The theoretical aspect of junction temperature dependency of two major parameters—the forward voltage and the radiant flux—on heat dissipation is reviewed. Actual measurements of the heat dissipation over a wide range of junction temperatures are followed to quantify the effect of the parameters using commercially available LEDs. The results show that (1) the effect of the junction temperature dependency on heat dissipation is governed largely by the LED power efficiency and (2) each parameter contributes to the total heat dissipation in an opposite way so that the absolute changes of the heat dissipation are not significant over a wide range of junction temperature. An empirical model of heat dissipation is proposed for applications in practice.
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abstractThe effect of junction temperature on heat dissipation of high power light emitting diodes (LEDs) is investigated. The theoretical aspect of junction temperature dependency of two major parameters—the forward voltage and the radiant flux—on heat dissipation is reviewed. Actual measurements of the heat dissipation over a wide range of junction temperatures are followed to quantify the effect of the parameters using commercially available LEDs. The results show that (1) the effect of the junction temperature dependency on heat dissipation is governed largely by the LED power efficiency and (2) each parameter contributes to the total heat dissipation in an opposite way so that the absolute changes of the heat dissipation are not significant over a wide range of junction temperature. An empirical model of heat dissipation is proposed for applications in practice.
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date2016-03-28