双波长Pr(上标 3+)掺杂12CaO•7Al2O3的光存储特性

Pr(superscript 3+)-doped 12CaO•7Al2O3(C12A7:Pr(superscript 3+)) powders were prepared using the coprecipitation method and were characterized by XRD, excitation and emission spectra, fluorescence lifetime, afterglow decay, thermoluminescence and photostimulated luminescence. The emission peaks at 491, 535, 614 nm are attributed to the transition of 3P0→3H4, 3P0→3H5 and 1D2→3H4 of Pr(superscript 3+)ions. The long afterglow emission locate at 491, 535, 614 nm, the time of the afterglow emission is about 300 s. By fitting the thermoluminescence spectrum data, the depth of the trap is about 0.63 eV. After the samples were irradiated by UV light (230 nm) for 5 min and placed in the dark for 5 min to drain the afterglow, the intensive photostimulated luminescence (PSL) is observed under infrared excitation (808 nm) due to the existence of the shallow traps. Our results indicate that C12A7:Pr(superscript 3+) phosphor with three-wavelength phosphorescence and two-wavelength optical storage can be used in optical storage field as one kind of multi-dimension recording materials.