锰掺杂对CaS∶Eu光激励发光性能的影响

Influence of Doped Manganese on Photostimulated Luminescence Properties of CaS∶Eu

采用硫化助熔剂法制备了CaS∶Eu,Mn荧光粉。通过测量样品的荧光光谱和紫外光辐照下的光激励发光谱,发现Mn离子的掺入使CaS∶Eu的发光性能明显增强,存在于基质材料中的陷阱分布因掺入Mn杂质而改变,形成了新的俘获中心,引起能量转移。增大了电子俘获过程中电子和空穴复合的几率,有利于提高材料的存储性能。比较了不同浓度下发射光谱的差异,探讨了掺杂浓度对发光特性的影响。通过比较光激励发光衰减曲线,进一步表明了Mn掺杂对CaS∶Eu光激励发光性能的改善。

The phosphor CaS∶Eu doped with Mn was prepared by sulfurization flux method (SFM). Photostimulated luminescence (PSL) and ultraviolet photostimulated luminescent of the phosphors were measured. The introduction of Mn into CaS∶Eu makes the fluorescence of CaS∶Eu, Mn efficiently enhance. The electron transfer process in mentioned above process and the mechanism for PSL were studied. The storage density is found to be increased. The influence of dopant concentrations of Mn^(2+) and Eu^(2+) on luminescence properties of CaS∶Eu, Mn was discussed. The energy transfer from Mn to Eu ions improves the luminescence effectively, comparing with the PSL decay curves of the materials.