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使用发射波长为395～400 nm的近紫外LED芯片来激发发射峰值波长分别在615,505和445 nm的红绿蓝三基色荧光粉,建立三基色荧光粉混光理论模型,制作不同色温下高显色指数白光发光二极管,研究其光电特性。实验结果表明,采用近紫外激发的三基色白光器件色温为3 000～9 000 K范围内,其显色指数均能保持在80～90之间;当色温大于5 000 K时,显色指数可以达到85;测试结果与理论计算吻合良好。最后,实验证明加入TiO2粉末可消除白光LED中残余近紫外线,三基色荧光粉白光LED色度参数受工作电流变化的影响较小。
The near-infrared LED chip with emission wavelength of 395-400 nm was used to excite the red, green and blue phosphors with peak wavelengths of 615, 505 and 445 nm respectively. The theoretical model of trichromatic phosphors was established to produce high color rendering Index white light-emitting diodes, to study the photoelectric properties. The experimental results show that the color rendering index of the trichromatic white light devices excited by near ultraviolet can be kept between 80 and 90 when the color temperature is between 3 000 and 9 000 K. When the color temperature is above 5 000 K, Reaching 85; test results and theoretical calculations in good agreement. Finally, experiments show that the addition of TiO2 powder can eliminate the residual UV light in the white LED. The chromaticity parameters of the trichromatic phosphor LED are less affected by the operating current.