Enhanced red phosphorescence in nanosized CaTiO3 : Pr3+ phosphors

Enhanced red phosphorescence in nanosized CaTiO3 : Pr3+ phosphors
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纳米 CaTiO3 : Pr3 荧光粉中增强的红色磷光

DOI:
10.1063/1.2722205
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发表时间:
2007-04
影响因子:
4
通讯作者:
Wang, Xiao-jun
Wang, Xiao-jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang, Meiyuan;Zhang, Xianmin;Zhang, Jiahua;Nie, Zhaogang;Ren, Xinguang;Wang, Xiao-jun

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研究了Pr ~(3+)在CaTiO_3纳米颗粒中的红光和磷光随Pr ~(3+)浓度的变化。纳米荧光粉的余辉时间为30 min,猝灭浓度为0.4mol%,比本体荧光粉的余辉时间为10 min,猝灭浓度为0.1mol%。在相应的猝灭浓度下,纳米荧光粉的初始磷光比本体磷光强一个数量级。磷光衰减模式和紫外光照射前后的漫反射光谱表明,在纳米颗粒中存在更多的陷阱有助于磷光。
The red photoluminescence and phosphorescence originating from D21-H43 transition of Pr3+ in CaTiO3 nanoparticles are studied as a function of Pr3+ concentrations. The nanophosphors exhibit both longer persistence time of 30min and higher quenching concentration of 0.4mol% than the bulk (10min and 0.1mol%). The initial phosphorescence in the nanophosphor is an order of magnitude stronger than that in the bulk at the corresponding quenching concentrations. Phosphorescence decay patterns and diffused reflectance spectra before and after ultraviolet exposure indicate the existence of more traps contributing to phosphorescence in the nanoparticles.
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