Maintenance of stable light emission in high power LEDs

As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high powe...

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Bibliographic Details
Published in:Microelectronics and reliability 2012-05, Vol.52 (5), p.912-915
Main Authors: Chou, Hung-Yu, Chen, Cheng-Chien, Yang, Tsung-Hsun
Format: Article
Language:English
Subjects:
Driving conditions
Electric current
Electric power generation
Electrical junctions
Emission
Light emission
Maintenance
Robustness
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Summary:As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high power LEDs upon the driving electric current and the junction temperature will be explored in details. One integrated measurement system is proposed for the study in simultaneously obtaining all the thermal–optic–electric characteristics of LEDs throughout the measuring. Based on the basic feedback control methodology, one simple maintaining procedure is applied for the stable light emission in high power LEDs. It shows the robustness of the maintaining procedure from the environment change with the least heat dissipation in the operation of the high power LEDs. The results imply that all the thermal, the optic, and the electric properties of the high power LEDs should be taken into consideration in the same time rather than separately when maintaining their operation.
ISSN:0026-2714
1872-941X
DOI:10.1016/j.microrel.2012.02.002