Tb^(3+),Eu^(3+)双掺单基质K_3La(PO_4)_2颜色可调荧光粉的合成与发光性能

Synthesis and luminescent properties of Tb^(3+) and Eu^(3+)-doped K_3La(PO_4)_2 color tunable phosphors

采用高温固相法合成了一系列Tb^(3+),Eu^(3+)掺杂的K3La(PO4)2荧光粉.通过X射线衍射,激发发射光谱以及荧光衰减曲线对样品进行了表征.结果表明,随着Tb^(3+)掺杂浓度的增加,K3La(PO4)2:Tb^(3+)荧光粉呈现蓝光至绿光.在K3La(PO4)2:Tb^(3+)荧光粉中加入Eu^(3+)后,存在着Tb^(3+)对Eu^(3+)离子的电偶极-电偶极相互作用的能量转移过程.当Eu^(3+)的掺杂量为9%时,能量转移效率高达85.89%.随着Eu^(3+)的加入,CIE坐标显示荧光粉的发射光颜色呈现绿色→黄色→橙色的渐变.因此K3La(PO4)2:RE3+(RE=Tb,Eu)可实现单相荧光粉的多色发射.

A series of Tb3＋, Eu3＋ doped KaLa（PO4）2 phosphors were synthesized by high temperature solid state method. The samples were characterized by X ray diffraction, photo luminescence spectra and fluorescence decay curves. The results show that KaLa（PO4）2.. Tb3＋ phosphors exhibit blue to green light with increasing Tba＋ doping concentration. After adding Eu3＋ to the KaLa（PO4）2：Tb3 ＋ phosphor,there is an energy transfer process of the e lectric dipole electric dipole interaction of Eu3＋ ion by Tb3＋. When the doping amount of Eu3＋ is 9% ,the energy transfer efficiency is as high as 85.89% . With the addition of Eu3＋ , the CIE coordinates show that the color of the emitted light of the phosphor appears as a greenish yellow orange gradient. Therefore, KaLa （PO4）2 ： RE3＋ （RE = Tb, Eu） can realize multi color emission of single phase phosphor.