荧光粉BaY2 Si3 O10 : Bi3+, Eu3+ 经高温 固相法制备并由X-ray衍射谱仪分析其物相结构。实验结果显示Bi3+ 共掺下BaY2 Si3 O10 :Eu3+ 的 激发光谱呈现一个有明显增强的宽电荷转移带(CTB)和系列Eu3+ 的f－f 窄吸收峰,发射谱为Eu3+ 的5D0-7FJ 橙-红光发射。当用285 nm 紫外光激发时, Bi3+ 到Eu3+ 间存在有效的能量传递,导致Bi3+ 的宽带紫外发射(中心345 nm)强度减弱, 而Eu3+ 的橙-红光发射显著增强;随着Eu3+ 浓度的增加,能量传递效率也随之提高。 最佳Eu3+ 浓度为0.4摩尔百分比,此后荧光粉发射强度发生浓度猝灭。结果表明Bi3+ 共掺时明显改善 和提升荧光粉在电荷转移带(200～350 nm)的激发效率。Bi3+ 到Eu3+ 间主要的 能量传递机制是通过四极-四极相互作用实现,并且能量 传递的临界作用距离是1.604 nm。

Phosphors BaY2 Si3 O10 : Bi3+, Eu3+ were synthesized by solid-state reaction method. Their phases and optical properties were analysed by using X-ray powder diffractionmeter and fluorescence spectrometer, respectively. The photoluminescence excitation (PLE) spectra of BaY2 Si3 O10 : Eu3+ consist of an enhanced broad charge transfer band (CTB) ranged 200～350 nm and a series of f-f narrow absorption band of Eu3+, the 5D0 →7FJ (J = 1 centered at 592 nm orange, J=2 at 615 nm red) transitions of Eu3+ present the typical orange-red emission band. When phosphors were excited by 285 nm light, the spectral overlap of emission band of Bi3+ and excitation spectra of Eu3+ demonstrated the energy transfer from Bi3+ to Eu3+ that positively enhance the orange-red luminescence of Eu3+ in BaY2 Si3 O10 : Eu3+ . The optimized doping is 0.4 mol% for Eu3+ . The critical transfer distance was calculated to be 1.604 nm, and the concentration quenching mechanism was mainly due to the electric quadrapole-quadrapole interactions.