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用计算机模拟的方法计算分析了三基色荧光灯中蓝色荧光粉光谱位置和带宽变化对三基色荧光灯光效和显色指数的影响。计算结果表明 :当蓝粉的峰值波长为 4 5 5nm时 ,三基色荧光灯的发光效率为最大 ,而峰值波长为 4 70nm时 ,其荧光灯的显色指数为最佳。综合两者考虑 ,要得到高效率和高显色性的三基色荧光灯 ,蓝色荧光粉发光峰的峰值波长应处在 4 5 5～ 4 70nm之间。当蓝色荧光粉发光峰强度和带宽不变 ,峰值波长从 4 5 5nm向长波移动 ,虽然蓝粉本身的亮度在增加 ,而模拟的三基色荧光灯光效却有所下降 ,但显色指数有一定的提高。蓝粉带宽的增加不利于荧光灯总亮度的提高 ,但对显色指数的提高有帮助。总之 ,若蓝粉的发光峰峰值波长已处在 4 5 5nm附近 ,提高三基色荧光灯光效的根本途径是提高蓝粉的量子效率 ,而不是移动其发光峰位置。
The influence of the position and bandwidth of the blue phosphor in the trichromatic fluorescent lamp on the luminous efficacy and color rendering index of the trichromatic fluorescent lamp was calculated and analyzed by computer simulation. The calculated results show that when the peak wavelength of blue powder is 455nm, the luminescence efficiency of the three primary color fluorescent lamps is the maximum, while the peak value of the wavelength is 470nm, the color rendering index of the fluorescent lamp is the best. Considering both, to obtain high efficiency and high color rendering of the trichromatic fluorescent lamp, the peak wavelength of the emission peak of the blue phosphor should be between 455 and 4700 nm. When the peak intensity and bandwidth of the blue phosphor remain the same, the peak wavelength shifts from 455nm to the long wavelength. Although the brightness of the blue phosphor itself increases and the luminous efficacy of the simulated three-primary color fluorescent lamp decreases, the color rendering index A certain increase. The increase of blue powder bandwidth is not conducive to the total brightness of fluorescent lamps, but to improve the color rendering index. In short, if the emission peak wavelength of blue powder is already around 455nm, the fundamental way to improve the luminous efficacy of the trichromatic fluorescent lamp is to increase the quantum efficiency of blue powder instead of moving its emission peak position.