Effect of Different Ce³⁺/Tb³⁺-doping Concentration on Fluorescent Properties of LaPO₄:Ce³⁺/Tb³⁺Crystals

LaPO ₄:Ce ³⁺/Tb ³⁺fluorescent crystals were successfully synthesized by solvothermal method at 150 ℃ for 12 h. The statistics of XRD showed that the LaP0 ₄: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⁺=6:3:1 when the pH of the solution was 9.0. By means of fluorescence spectra, it is easy to find that the strongest excitation peak for LaP0 ₄:Ce ³⁺/Tb ³⁺appears at 270 nm, and the strongest emission peak is found at 545nm which corresponds to the 5D4→7F5 transition of Tb ³⁺