Synthesis, structure and optical properties of erbium-doped lithium barium phosphate

摘要

Li2BaP2O7 activated with Er3+ ions was prepared by the classic ceramic method and characterized by X-ray diffraction technique, IR, Raman and photoluminescence (PL) spectroscopies. The Li2BaP2O7 Er phosphors exhibited a monoclinic single phase structure with C2/c space group. A green and red emission lines dominate the spectrum upon excitation at 400 nm. The CIE-coordinate (x = 0.308, y = 0.512) were found in green light. Free ion parameters of the Er3+ ions in Li2BaP2O7 and the Judd-Ofelt parameters were calculated and they were used to explore the radiative parameters such as transition probability (A(T)), and branching ratios (beta) related to the Er3+ emission transitions. The calculated S-4(3/2) radiative life time around 0.198 ms is compared with the experimental value. The calculated quantum efficiency is about 42%. Li2BaP2O7: Er can be considered as a novel green phosphor.