Optical properties of long-lasting phosphorescent crystals Ce3+-doped Ca2Al2SiO7 and CaYAl3O7

Abstract UV excitation of Ce3+-doped melilite crystals Ca2Al2SiO7 and CaYAl3O7 produces long-lasting phosphorescence besides intrinsic Ce3+ luminescence with lifetime of 40 ns. The intensity of the phosphorescence was measured as functions of temperature and time. The temperature dependence of the intensity integrated in time domain supports the upward-hopping mechanism of the trapped electron and the recombination of electron and hole at localized hole sites Ce4+.