Title :
Light emission mechanism of Lu2(SiO4)O:Ce
Author :
Suzuki, H. ; Tombrello, T.A. ; Melcher, C.L. ; Schweitzer, J.S.
Author_Institution :
Div. of Phys. Math. & Astron., California Inst. of Technol., Pasadena, CA, USA
Abstract :
Two types of excitation and emission spectra with ultraviolet excitation are shown at 11 K for Lu2(SiO4)O:Ce (LSO). Since there are two crystallographically independent lutetium sites in LSO, the existence of two Ce activation centers (two-activation-center model) is proposed. The existence of two different decay time constants of the order of tens of nanoseconds, which are characteristic for fast Ce emission, are shown at 77 K. Although the temperature dependence of the decay time and the luminescence efficiency could not be measured for the Ce2, the fact that the gamma-ray-excited emission can be reconstructed from a weighted combination of the Ce1 and Ce2 emission spectra supports the two-activation-center model for LSO
Keywords :
cerium; luminescence of inorganic solids; lutetium compounds; photoluminescence; 11 K; Ce activation centers; LSO; Lu2(SiO4)O:Ce; decay time; decay time constants; emission spectra; excitation spectra; light emission mechanism; luminescence efficiency; temperature dependence; two-activation-center model; ultraviolet excitation; Bismuth; Copper; Crystalline materials; Crystallography; Electromagnetic wave absorption; Gamma ray detection; Gamma ray detectors; Laboratories; Solid scintillation detectors; Temperature;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301135
