Abstract：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%.
Key words：White-light-emitting diode;Phosphor powder;Color rendering index;Low color temperature
王 峰1，黄小辉1，王怀兵1*，刘建平1，范亚明1，祝运芝2，金 铮2 . GaN基低色温高显色白光LED[J]. 光谱学与光谱分析, 2011, 31(06): 1446-1449.
WANG Feng1, HUANG Xiao-hui1, WANG Huai-bing1*, LIU Jian-ping1, FAN Ya-ming1，ZHU Yun-zhi2, JIN Zheng2 . GaN-Based White-Light-Emitting Diodes with Low Color Temperature and High Color Rendering Index . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(06): 1446-1449.
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