Luminescence of Ce~(3+) at two different sites in α-Sr_2P_2O_7 under vacuum ultraviolet-UV and x-ray excitation

摘要

A series of Ce_(3+) doped α-Sr_(2_2x)Ce_xNa_xP_2O_7 phosphor compounds has been prepared using a high-temperature solid-state reaction technique. The luminescence properties under vacuum ultraviolet-UV and x-ray excitation were studied. Luminescence spectra reveal three UV-emitting peaks at about 310, 330, and 350 nm from which we conclude that Ce_(3+) occupies two distinct sites in α-Sr_2P_2O_7. The influences of the doping concentration, the temperature, and the excitation wavelength on the luminescence of Ce_(3+) at the Ce(I) and Ce(II) sites together with the decay characteristics are discussed. The light yield under x-ray excitation is found to be around 10 000 photons/MeV.