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24 September 2011 Effects of voltage modulation of individual RGYB LEDs on the high power phosphor LED for color temperature and luminous efficiency
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Abstract
In this study, we would like to tune the color temperature of the high power phosphor Light-Emitting Diodes (LEDs) with the single LED of red, green, yellow and blue, respectively. The starting color temperature of the white phosphor LED will be set at 7500K (D75 white light), then changing the voltage of the single LED of the red, green, yellow and blue, respectively, to find the best tuning function for the color temperature and luminous efficiency. These results exhibited that changing the voltage of red LED had the broader color temperature from 7500 K to 1500 K and low luminous variation from 54 to 41 lm /W than green and blue LEDs. Though the green and yellow LEDs had the low luminous variation from 47 to 51 lm /W and from 40 to 47 lm /W, respectively, but the color temperature of green and yellow LEDs could only fine turn from 7500K to 8200K and 4700K to 7500K, respectively. The luminous efficiency had rapid variation from 27 to 42 lm /W and out of the color temperature of 20000K for the voltage tuning of blue LED. Therefore, the voltage tuning of red LED could show the warm color temperature for the human life. The variation of color shifts (Δuv) of red and green LEDs changed from small to large with the increasing of the enhanced voltage. But the variation of Δuv of the yellow and blue LED changed nothing with the increasing of the enhanced voltage.
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Hsi-Chao Chen, Guo-Yang Wu, Chi-Hao Yang, Yen-Ming Lo, Jian-Fong Jhou, and Shu-Ren Li "Effects of voltage modulation of individual RGYB LEDs on the high power phosphor LED for color temperature and luminous efficiency", Proc. SPIE 8123, Eleventh International Conference on Solid State Lighting, 812318 (24 September 2011); https://doi.org/10.1117/12.892258
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