Title :
The role of charge transfer states in Ln3+-activated scintillators
Author :
Wojtowicz, A.J. ; Lempicki, A. ; Wisniewski, D. ; Balcerzyk, M. ; Brecher, C.
Author_Institution :
Dept. of Chem., Boston Univ., MA, USA
fDate :
30 Oct-5 Nov 1994
Abstract :
The ability of activating ions to change their charge state under ionizing radiation is essential for efficient performance of rare earth (RE) doped scintillator materials utilizing the carrier recombination energy. In this Communication we present and consider two different cases: In one case (Ce:LuPO4, Ce:YAlO3, Ce:LuAlO 3) the charge state involved in the scintillation mechanism is Ce4+, while in the other (Yb:LuPO4, YbPO4 ) it is Yb2+. The sequence of carrier trapping is discussed and interpreted using a simple, single-configuration-coordinate model
Keywords :
cerium; charge transfer states; electron-hole recombination; ionoluminescence; lutetium compounds; scintillation; solid scintillation detectors; ytterbium compounds; yttrium compounds; Ln3+-activated scintillators; LuAlO3:Ce; LuPO4:Ce; LuPO4:Yb; YAlO3:Ce; YbPO4; activating ions; carrier recombination energy; carrier trapping; charge state; charge transfer states; rare earth doped scintillator materials; scintillation mechanism; single-configuration-coordinate model; Charge carrier processes; Charge transfer; Chemistry; Conducting materials; Electron traps; Energy exchange; Ionizing radiation; Lattices; Physics; Pulse measurements;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474374
