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Thermal characteristic of light emitting diodes is one of primary reliability parameters. In this paper, the thermal resistances of different kinds of blue and white high power LEDs are measured by the forward voltage based method. The relationships between thermal resistance and heat time at measurement currents 1mA, 5mA and 10mA are obtained respectively. The results show that there is optimum heat...
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...
Laser beam induced current measurements were used to study photovoltaic arrays formed on Hg vacancy-doped and As-doped HgCdTe materials at temperatures of 300 K and 87 K. For As-doped sample, the great difference of the diffusion length at two different temperatures can be explained by the mixed conduction behavior at 87 K, and the peak-to-peak width has an expansion of 10 mum from 300 K to 87 K,...
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