GdF_3∶Ce~(3+),Dy~(3+)@GdF_3∶Eu~(3+)核壳结构荧光粉溶剂热法制备及其多色发光性能研究

采用溶剂热法合成了核壳结构纳米荧光粉GdF_3∶Ce~(3+),Dy~(3+)@GdF_3∶Eu~(3+)。XRD衍射图样显示所制备纳米晶为正交相;在Ce~(3+)的8S7/2→6IJ激发峰激发下,该核壳结构具有明显的多色发光性能,而在相应的非核壳结构中却由于Ce~(3+)共掺导致Eu~(3+)出现荧光猝灭现象。基于CIE坐标,可以看出该体系的核壳结构具有比非核壳结构优越的发光性能,这主要是因为Gd~(3+)起到媒介离子的作用。最后,讨论了壳厚度对发光的影响,结果发现当核壳的量比为1∶3时,荧光粉具有最大的发光强度。

Synthesize and Multicolor Luminous Performance of GdF3∶ Ce3+ ,Dy3+@GdF3∶Eu3+ Core-shell Structure Phosphors by Solvothermal Method

The core-shell structure nanophosphors GdF₃:Ce³⁺,Dy³⁺@GdF₃:Eu³⁺ were synthesized via solvothermal method. XRD patterns show that the synthesized nanocrystallines(NCs) are orthorhombic phase both for the core and shell. Under the excitation of ⁸S_7/2→⁶I_J of Ce³⁺, the core-shell structure nanophosphors exhibit well multicolor luminous performance, while for corresponding none core-shell structure nanophosphors, emission of Eu³⁺ denotes obvious fluorescence quenching phenomenon due to co-doping Ce³⁺. Based on the CIE(x, y) coordinate diagram, it can be seen that the core-shell structure nanophosphors own more excellent luminescent properties than that of the none core-shell structure nanophosphors due to the influence of Gd³⁺. Lastly, the influence of thickness of shell on lighting of the phosphors was discussed. It is found that the core-shell structure phosphors own the best emission intensity on condition that ratio of the core and shell is 1:3.