白磷钙石型荧光粉Ca_(1.8)Li_(0.6)La_(0.6-x)(PO_(4))_(2)∶xEu^(3+)的合成、结构及发光性能

Synthesis,Structure and Photoluminescent Properties of Ca_(1.8)Li_(0.6)La_(0.6-x)(PO_(4))_(2)∶xEu^(3+) Phosphor with Whitlockite Structure

白磷钙石结构化合物合成温度较低,且具有更加丰富可调变的晶体学格位,是一种优良的发光基质材料。本文采用高温固相法在1250℃条件下合成了白磷钙石型发光材料Ca_(1.8)Li_(0.6)La_(0.6-x)(PO_(4))_(2)∶xEu^(3+)(x=0、0.01、0.03、0.06、0.09、0.15),并采用X射线粉末衍射仪(XRD)和荧光光谱仪对其结构和发光性能进行系统表征。结果表明,制备荧光粉均为白磷钙石结构,Eu^(3+)的掺杂并未在很大程度上改变其结构。该体系荧光粉发射红光,发射光谱出现了Eu^(3+)的特征发射,最强发射峰位于617 nm处,来源Eu^(3+)的^(5)D_(0)→^(7)F_(2)跃迁。随着Eu^(3+)掺杂浓度的增加,样品的荧光寿命逐渐减小,证明了Eu^(3+)离子间能量传递的存在。

Whitlockite is an excellent luminescent material.It has lower synthesis temperature and an abundance of adjustable crystal lattice.Ca_(1.8)Li_(0.6)La_(0.6-x)(PO_(4))_(2)∶xEu^(3+)(x=0,0.01,0.03,0.06,0.09,0.15)was synthesized by high temperature solid state reaction at 1250℃,and its structure and luminescent properties were characterized by X-ray powder diffraction(XRD)and fluorescence spectrometer.The results show that the phosphors belongs to whitlockite structure,and the doping of Eu^(3+) does not change the structure to a great extent.The phosphor in the system emits red light,and the characteristic emission of Eu^(3+) appears in the emission spectrum.The strongest emission peak locates at 617 nm and comes from ^(5)D_(0)→^(7)F_(2) transition of Eu^(3+).As the concentration of Eu^(3+) increases,the fluorescence lifetime decreases,which proves the existence of energy transfer between Eu^(3+).