荧光粉Li_2SrSiO_4:Dy^(3+),Eu^(3+)的阴极射线发光性能研究

Cathodoluminescent Properties of Li_2SrSiO_4: Dy^(3+),Eu^(3+) Phosphors

通过高温固相法制备Li2Sr Si O4:Dy3+,Eu3+荧光粉,采用X-射线粉末衍射(XRD)和阴极射线光谱分别对其物相、阴极射线发光性能进行研究,并研究Dy3+离子掺杂量对其发光性能的影响.结果表明,Dy3+和Eu3+均作为发光中心进入到Li2Sr Si O4的晶格中并未改变其晶格结构;在0.5~5 k V的电子束激发下,发射光谱主要由Dy3+和Eu3+的f-f特征跃迁组成;随着Dy3+掺杂量的增加,Dy3+的发射强度先增强后减弱,说明存在浓度猝灭,而Eu3+的发射强度有所提高,说明Dy3+对Eu3+有一定的敏化作用;Dy3+的最佳掺杂量为0.15;随着电压和电流的增加,样品的发光强度逐渐提高.

A Li2 SrSiO4：Dy^3＋, Eu^3＋phosphor was prepared by the high temperature solid-state method. Its structure and Cathodoluminescence （ CL） properties were characterized by X-Ray powder diffraction （ XRD） and CL spectrum, respectively. The influence of Dy^3＋ doping concentration on its CL properties was also stud-ied. The results show that all Dy^3＋ and Eu^3＋ act as luminescent centers into the crystal lattice of Li2 SrSiO4 without changing its crystal structure. Under 0. 5-7 kV electron beam excitation, emission spectrum consisted of f-f characteristic transitions of Dy^3＋ and Eu^3＋ ions. With increasing of Dy^3＋concentration, the intensities of Dy^3＋ emissions increase then decrease because of quenching concentration. However, the intensities of Eu^3＋emissions increase due to energy transfer from Dy^3＋ to Eu^3＋. The optimum Dy^3＋doping concentrations are 0. 15. The CL intensity increases upon raising the accelerating voltage and filament current.