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蓝粉光谱特征对三基色荧光灯光色影响的色度学模拟计算 总被引:2,自引:0,他引:2
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。 相似文献
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The luminescence of EU^2+ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from different Eu^2+ sites in the lattice. When the BaB2O4 flux was applied, the intensity of the 398 nm emission was not clearly affected, but the intensity of the 515 nm emission was enhanced by about ten times. Gaussian fitting showed that the emission band at around 515 nm could actually be resolved into two bands with peak wavelengths of 499 nm and 521 nm, respectively. The assignments of the emission bands to the cation sites were carried out according to the values of bond valence. The overlapping of the 398 nm emission band on the excitation band of 515 nm emission implied that energy transfer could occur from the luminescent center related to the 398 nm emission to the center related to the 515 nm emission, and the energy transfer process remarkably enhanced the intensity of the 515 nm emission band. The phosphor had strong excitation at around 350-400 nm and emitted a bright green luminescence. Thus it could have applications as a green component in solid-state lighting devices assembled by near-UV Light Emitting Diodes (LED) combined with tricolor phosphors. 相似文献
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