LaPO4:Eu3+的PEG2000辅助水热法制备及发光特性

采用水热法,以聚乙二醇2000(PEG2000)为添加剂,成功制备了铕掺杂的磷酸镧纳米颗粒。通过扫描电子显微镜(SEM)观察到所制得的纳米颗粒分散性较好,呈球形放射状结构。用X射线粉末衍射仪(XRD)对其结构进行了表征,实验表明:LaPO4属单斜晶系,独居石结构,700℃煅烧2 h基本晶化完全。研究了不同合成条件、煅烧时间、煅烧温度及不同铕含量对材料发光性质的影响,荧光光谱(FS)数据表明:最佳制备条件是pH等于9的条件下180℃反应14 h;随着煅烧温度的升高,激发峰及各个发射峰的强度都增大,850℃时,煅烧1 h发光强度最大,随着时间的延长发光强度反而减小;随着铕含量的增加,发光强度先增强后减弱,Eu3 的掺加量在4%(摩尔分数)时,纳米粒子的荧光强度最强,更高的掺杂浓度将导致荧光猝灭。

PEG Assisted Hydrothermal Synthesis of LaPO4:Eu3+ Nanoparticles

The present reports a hydrothermal process to synthesize the precursor of Eu(3+)-doped LaPO4 nanoparticles with PEG2000 used as additive. SEM shows that the nanoparticles are similar to spheres. The Eu(3+-)doped LaPO4 phosphor was characterized by powder X-ray diffractometer. According to our measurements with XRD, the products belong to monoclinic monazite type, and the samples were well crystallized after sintering at 700 degrees C for 2 h. The effects of synthesis condition, sintering temperature and time on the luminescence of the samples were investigated. The luminescence data indicated that the optimum condition for synthesizing the precursor was at 180 degrees C for 14 h, and the optimum condition for heat-treatment of the precursor was at 850 degrees C for 1 hour. The effects of different contents of Eu3+ on the luminescence of LaPO4 : EuO3+ nanoparticles were also investigated, and the results showed that the luminescence intensity was enhanced with the slight increase in the Eu3+ content, and the optimum Eu(3+)-doping concentration was 4% (mole fraction).