不同Ce^(3+)/Tb^(3+)掺杂浓度对LaPO_4:Ce^(3+)/Tb^(3+)晶体荧光性质的影响

Effect of Different Ce^(3+)/Tb^(3+)-doping Concentration on Fluorescent Properties of LaPO_4:Ce^(3+)/Tb^(3+) Crystals

用溶剂热法、150℃反应12h成功合成了分散性良好的LaP04:Ce3+/Tb3+荧光晶体.XRD数据表明,合成了六方晶系的LaP04:Ce3+/Tb3+晶体(PDF 84-0600).pH为9.0时,合成晶体的离子最佳摩尔比为nLa3+∶nCe3+∶nTb3+=6∶3∶1.根据荧光光谱可知,LaP04:Ce3+/Tb3+在270nm处有最强激发峰,在545nm处有最强发射峰,对应于Tb3+的5 D4→7F5跃迁.

LaPO4：Ce^3＋/Tb^3＋fluorescent crystals were successfully synthesized by solvothermal method at 150℃for 12 h.The statistics of XRD showed that the LaP04∶Ce^3＋/Tb^3＋（PDF 84-0600）Crystals thus prepared are of a hexagonal system.The optimal molar ratio of the composite particles is nLa^3＋∶nCe^3＋∶nTb^3＋=6∶3∶1when the pH of the solution was 9.0.By means of fluorescence spectra,it is easy to find that the strongest excitation peak for LaP04：Ce^3＋/Tb^3＋appears at 270 nm,and the strongest emission peak is found at 545 nm which corresponds to the 5D4→7F5transition of Tb^3＋.