Bi^(3+)共掺和能量传递对BaY_2Si_3O_(10):Eu^(3+)发光的调制和增强  

Modulation and enhancement of luminescence of BaY_2Si_3O_(10):Eu^(3+) phosphor through energy transfer by Bi^(3+) co-doping

作　　者：崔跃鹏[1] 胡正发[1] 叶定华[1] 张伟[1] 盛霞[1] 罗莉[1] 王银海[1] 

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006

出　　处：《量子电子学报》2014年第6期641-647,共7页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(21271048);广东省重大科技专项(2011A080801015)资助

摘　　要：荧光粉BaY_2Si_3O_(10):Bi^(3+),Eu^(3+)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Bi^(3+)共掺下BaY_2Si_3O_(10):Eu^(3+)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Eu^(3+)的f-f窄吸收峰,发射谱为Eu^(3+)的~5D_0—~7F_J橙-红光发射。当用285 nm紫外光激发时,Bi^(3+)到Eu^(3+)间存在有效的能量传递,导致Bi^(3+)的宽带紫外发射(中心345 nm)强度减弱,而Eu^(3+)的橙-红光发射显著增强;随着Eu^(3+)浓度的增加,能量传递效率也随之提高。最佳Eu^(3+)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Bi^(3+)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。Bi^(3+)到Eu^(3+)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 ： Bi^3＋, Eu^3＋ 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 ： Eu^3＋ 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 Bi^3＋ to Eu^3＋ that positively enhance the orange-red luminescence of Eu^3＋ in BaY2 Si3 O10 ： Eu^3＋ . The optimized doping is 0.4 mol% for Eu^3＋ . 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.

关 键 词：材料 荧光粉 高温固相法 BI^3+ Eu^3+共掺 BaY2Si3O10 

分 类 号：O649[理学—物理化学]