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With the increased efficiency of high power LED, the thermal design of the device used LEDs become more important. In this paper, four kinds of white power LEDs were selected, and the aim of this study was to compare the thermal and optical properties of the white power LEDs from different LED vendors, and to find LEDs with the optimal properties. Moreover, each group of LEDs was made into bulbs of...
A simple, fast, and reliable characterization of thermal properties method to determine junction temperature (Tj) in high power GaN-based light emitting diodes (LED) was presented in this study. Thermal characteristics of high power light-emitting-diode have been analyzed by using a three-dimensional thermal conduction model. Maximum operation temperature has also been calculated. The induced thermal...
We studied the thermal properties LED light unit composed of nine LED chips in a MLCMP (multi-layer ceramic-metal package) and compared various thermal dynamic models. We concluded that the direct measurement of forward voltage Vf is the most practical approach for in-situ testing. By calibrating the Vf to junction temperature Tj at various forward current in a temperature controlled oven, the linear...
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