Pr3+掺杂Sr2LaTaO6红色荧光粉的合成和发光性能分析

寻找能应用于白光LED的红色荧光粉，以稀土氧化物为原料，采用高温固相法制备Pr3+掺杂Sr2LaTaO6系列红色荧光粉，再通过XRD、SEM及荧光光谱仪等仪器对样品的物相结构、形貌特征、荧光特性、衰减寿命和荧光热猝灭等性能进行实验分析。结果表明:样品物相纯正、结晶度好，Pr3+的掺杂没有改变基质的晶体结构；样品可以被蓝光有效激发，发出色坐标为（0663 0，0336 6）的红光；Pr3+的最佳掺杂浓度（摩尔分数）为01%，随着Pr3+掺杂浓度（摩尔分数）不断高于该浓度，其荧光强度和衰减寿命都会递减；样品在室温到400 K这一温度范围内热稳定性良好。表明Pr3+掺杂的Sr2LaTaO6红色荧光粉有望应用于白光LED。

Study on the Synthesis and Luminescent Properties ofPr3+ doped Sr2LaTaO6 Red Phosphors

In order to find red phosphors that can be used in white LEDs,a series of Pr3+ doped Sr2LaTaO6 red phosphors were synthesized by high temperature solid state reaction,and the phase structure,morphological characteristics,fluorescent properties,decay lifetime,and thermal fluorescence quenching properties of these samples analyzed using XRD,SEM and fluorescence spectrometer.The results show that these samples have pure and well crystallized phase structure,remaining unchanged by the Pr3+ dopant,and they can be effectively excited by blue light and emit red light with color coordinates of (0.663 0,0.336 6).The optimal Pr3+ doping concentration is 0.1%,and the fluorescence intensity and decay lifetime decrease with the Pr3+ doping concentration surpassing this concentration.Pr3+ doped Sr2LaTaO6 has good thermal stability at temperature from 290 K to 400 K.Therefore,Pr3+ doped Sr2LaTaO6 red phosphor is applicable to white LEDs.