纳米稀土磷酸盐红色荧光粉的合成及性能

以Gd,Y和Eu的硝酸盐与(NH4)2HPO4为原料,采用室温固相反应合成出前驱体,再经过900℃煅烧2h得到(Gd,Y,Eu)PO4纳米荧光粉,运用TG-DTA、XRD、TEM、固体荧光等技术,研究了荧光粉的形成过程、晶体尺寸、形貌及发光性能.结果表明:荧光粉属于单斜晶系,独居石结构的正磷酸盐,空间群为P21/n,平均粒径为60 nm,分散性好,有较高的热稳定性.在396 nm紫外光激发下,纳米荧光粉发出Eu3+的特征红色荧光,发射主峰在613nm,归属于Eu3+离子的5D0→7F2跃迁,该纳米粉体是一种性能优良的荧光材料.

Preparation and Properties of Red-Emitting Rare Earth Phosphate Nanophosphors

The precursor of nanophosphor was prepared by the solid state reaction of the nitrates of Gd,Y,Eu and(NH_(4))_(2)HPO_(4) at room temperature.After annealing at 900 ℃for 2 h,the precursor formed(Gd,Y,Eu)PO_(4) nanophosphors.The formation process,particle-size,shape and fluorescence properties of the phosphor were characterized by means of TG-DTA,XRD,TEM and solid fluorescence techniques.The results indicate the nanophosphor is(Gd,Y,Eu)PO_(4),belonging to the monoclinic system and space group P2_(1)/n,average particle size 60 nm,with better particle dispersity and higher thermal stability.The phosphors exhibit red fluorescence when excited at 396 nm.The strongest emitting peak is at 613 nm,which can be assigned to ~(5)D_(0)→~(7)F_(2) transition of Eu~(3+) ion.The phosphor is a kind of efficient red-emitting luminescence material.