关键词: 焦硅酸镥;晶体生长;发光性能

Abstract: Cerium-doped lutetium pyrosilicate (LPS:Ce) crystal is a new found inorganic scintillator with promising scintillation properties. A boule with dimension of φlSmm × 40mm was grown successfully by using the Czochralski method. It's crystal structure was determined to be monoclinic with space group of C2/m and some inclusions was found to be composed of LPS and quartz. The optical transmission, UV and X-ray excited emission spectra, as well as decay curves were measured at room temperature. The cutoff edge of LPS:Ce crystals shifts to 350nm after doped with cerium ions. Two emissions peaks, 384nm and 412nm can be fitted into in the UV and X-ray excited emission spectra. The decay time of the fluorescence can be fitted with one exponential terms, 38.75ns, these two emission result from the transition of electrons from 5d to two ground levels (2F5/2 and 2F7/2)of Cerium ions(Ce3+)in the LPS crystals. The difference of luminescence between LPS: Ce and LSO: Ce can be explained from the difference of the crystal structure of these two types of crystals.