Spectroscopy and Spectral Analysis, Volume. 31, Issue 6, 1446(2011)
GaN-Based White-Light-Emitting Diodes with Low Color Temperature and High Color Rendering Index
The luminescence properties of high color rendering white LED depending on the proportions of mixed phosphor powders were investigated by adopting green and red phosphors stimulated by a 440 nm InGaN/GaN based blue LED. The results show that when the proportion of A/B type silica gels and green/red phosphor powders is 0.5∶0.5∶0.2∶0.03, two luminance bands are stimulated and their wavelength peaks are 535 and 643 nm, respectively. The minimum color temperature can reach 3 251 K, while the color rendering is as high as 88.8. Compared with the traditional white LED fabricated by yellow YAG-phosphors-coated high efficiency 460 nm blue LED, the color temperature is lower and the color rendering index can be increased by almost 26%.
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WANG Feng, HUANG Xiao-hui, WANG Huai-bing, LIU Jian-ping, FAN Ya-ming, ZHU Yun-zhi, JIN Zheng. GaN-Based White-Light-Emitting Diodes with Low Color Temperature and High Color Rendering Index[J]. Spectroscopy and Spectral Analysis, 2011, 31(6): 1446
Received: Sep. 15, 2010
Accepted: --
Published Online: Jan. 5, 2012
The Author Email: Feng WANG (fwang2008@sinano.ac.cn)