近紫外激发Ca2NaMg2V3O12:Sm3+荧光粉的制备及发光性能

近紫外激发单一基质白光发射荧光粉是当前LED用荧光转换材料的研究热点。采用高温固相反应制备了Ca2NaMg2V3O12∶Sm^3+荧光粉,并利用X射线粉末衍射仪和荧光光谱仪等测试手段,对其物质结构和荧光性能进行了表征。探讨了(VO4)^3-基团的发光机理,及其与Sm^3+离子之间的能量传递机制。结果表明:Ca2NaMg2V3O12∶Sm^3+荧光粉属于立方相晶体结构。在340nm紫外线激发下,样品发射蓝绿光,发射最强峰位于500nm,发射光谱覆盖整个可见光区。Sm^3+离子的最佳掺杂浓度为0.03,同时(VO4)^3-基团与Sm^3+离子之间的能量传递主要是通过电四偶极-电四偶极相互作用来实现的。

Preparation and Luminescent Properties of Near-Ultraviolet Excited Ca2 NaMg2 V3 O12:Sm3+ Phosphor

Single phase white light emission phosphors excited by near ultraviolet light is the research focus of luminescent conversion materials. The Ca2NaMg2V3O12∶Sm 3+ phosphors were prepared by the high temperature solid phase reaction and their crystal structure and fluorescence properties were characterized by the X-ray powder diffraction and fluorescence spectrometer. The luminescence mechanism of the (VO4)^3- groups and the energy transfer mechanism between (VO4)^3- groups and Sm^3+ ions were discussed. The results show that the Ca2NaMg2V3O12∶Sm^3+ phosphors belong to cubic crystal structure. Under the the excitation of the wavelength of 340 nm,the samples display blue-green emission with a strongest emission peak at 500 nm. The emission spectrum covers the whole visible light region. The optimized doping concentration for Sm^3+ ions is 0.03. Meanwhile,the energy transfer between (VO4)^3- groups and Sm^3+ ions is realized by electric quadrupole-quadrupole (q-q) interactions.