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Your search keyword '"Lin, Chun-Liang"' showing total 11 results
Start Over Author "Lin, Chun-Liang" Journal japanese journal of applied physics
11 results on '"Lin, Chun-Liang"'

11. Enhancement of Light Extraction Efficiency in GaN-Based Blue Light-Emitting Diodes by Doping TiO2Nanoparticles in Specific Region of Encapsulation Silicone

Author

Wang, Pin-Chao, Lin, Chun-Liang, and Su, Yan-Kuin

Abstract

TiO2nanoparticles (NPs) are doped in silicone for encapsulation of GaN-based blue light-emitting diodes (LEDs). The average refractive index of silicone is increased by doping TiO2NPs with an average diameter of 21 nm, and the light extraction efficiency of GaN-based blue LEDs is also increased. Four different TiO2NPs doping profiles are evaluated including without TiO2NPs doping, uniform doping, doping around the LED chip only, and doping in the region far from the LED chip. LED, with TiO2NPs (weight percentage of 0.01%) doping around the LED chip only, has the highest luminous flux of 0.98 lm at 20 mA. The conventional blue LED without TiO2doping has the luminous flux of 0.94 lm at 20 mA. According to our calculations based on the experimental results, the enhancement of the luminous flux is 3 and 5% higher than that without TiO2doping packages at 20 and 80 mA, respectively. TiO2doped in silicone can not only increase the luminous flux but also inhibit the lumen degradation under the stress test for 1500 h.

Published
2013
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