采用高温固相法制备了稀土Pr3+激活的Ca1-xPrxMoO4(0.005 ≤ x≤ 0.02) 系列红色荧光粉。荧光光谱表明: 在453 nm激发下, 样品产生了红光发射, 其中对应于Pr3+的特征跃迁3P0→3F2位于654 nm的红色发射峰最强。分析了Pr3+的掺杂摩尔分数x对样品发光强度的影响, 确定Pr3+的最佳掺杂摩尔分数为0.01。为进一步改善样品的发光效率, 在样品制备过程中分别采用了两种电荷补偿方式: 用1个Pr3+和1个M+(M=Li,Na)离子取代2个Ca2+离子或用2个Pr3+离子取代3个Ca2+离子。实验结果表明: 采用两种电荷补偿方法后, 样品的红色发光强度均明显增强, 尤其是加入Li+后的Ca0.98Pr0.01Li0.01MoO4样品的发光强度达到了未补偿样品的3.17倍。

Red-light-emitting phosphors of Pr3+ activated Ca1-xPrxMoO4 were synthesized by high temperature solid state reaction. The luminescence spectra of samples indicate that under the excitation of 453 nm, all samples produce red emission peak at 654 nm corresponding to the characteristic transition of Pr3+ (3P0→3F2). The influence of Pr3+ doping mole fraction (x) on the luminescent intensity of samples was analyzed. The optimum doping mole fraction of Pr3+ was x=0.01. In order to further improve the luminescent efficiency, two charge compensation approaches were applied: (1) two Ca2+ ions were replaced by one Pr3+ ion and one M+ (M=Li, Na) ion and (2) three Ca2+ ions were replaced by two Pr3+ ions. It is found that both charge compensation approaches can obviously improve the red luminescent intensity. In particular the relative emission intensity of Ca0.98Pr0.01Li0.01MoO4 reached more than 3.17-fold as compared with that of the sample without the charge compensation.