钆、铕共掺杂合成LaPO_4及发光性能研究

Synthesis and Luminescent Characteristics of Gadolinium,Europium Co-doped LaPO_4

以La（NO3）3.6H2O,Eu2O3,Gd（NO3）3和H3PO4为原料,在pH=9时合成了LaPO4：Eu,Gd粉体,并进行了煅烧。进行了XRD,SEM,荧光性能测试。结果表明：煅烧前的LaPO4：Eu,Gd具有六方相,径向约20 nm,长度100~200 nm枝杈状结构,发光较弱。煅烧后LaPO4：Eu,Gd逐渐变为单斜结构,发射强度也随温度升高而增加,1000℃后样品变为完全的单斜相,颗粒长大,出现团聚,发射强度也达到最大值。荧光图谱还发现了Gd3＋对Eu3＋的能量传递效应。

Through adjusting pH=9 by ammonia,LaPO4：Eu,Gd powder was synthesized with La（NO3）3 · 6H2O,Eu2O3,Gd（NO3）3 and H3PO4,and was calcined at different temperatures.The morphology,phase and properties of the products were investigated by XRD,SEM and spectro-fluorimeters.The experimental results showed that the morphology of products before calcination was branch-like with the length of 100~200 nm,the width of 20 nm,and the luminescence was weak.After heat treatment,the phase of products transformed to monoclinic phase,and the luminescence intensity grew with the heating temperature.The particles grew and aggregated at 1000 ℃,and showed a strong intensity.We could find the energy transfer effect between Gd3＋ and Eu3＋.