Title :
The carrier capture and recombination processes in Ln3+-activated scintillators
Author :
Wojtowicz, A.J. ; Lempicki, A. ; Wisniewski, D. ; Balcerzyk, M. ; Brecher, C.
fDate :
6/1/1996 12:00:00 AM
Abstract :
The ability of activator ions to capture charge carriers and assume a different charge state under ionizing radiation is essential for efficient performance of rare-earth (RE)-doped scintillator materials utilizing the carrier recombination energy. In this paper, the sequence of carrier trapping is discussed and interpreted using a simple, single-configuration-coordinate model for two different cases: In one case (LuPO4:Ce, YAlO3:Ce, LuAlO3:Ce) the charge state involved in the scintillation mechanism is Ce4+, while in the other (LuPO4:Yb, YbPO4) it is Yb2+. The possibility of a nonradiative recombination via Ce and Yb ions is also considered and found highly unlikely in accordance with experimental results
Keywords :
cerium; ion recombination; lutetium compounds; scintillation; solid scintillation detectors; ytterbium; ytterbium compounds; yttrium compounds; Ce4+; Ln3+-activated scintillators; LuAlO3:Ce; LuPO4:Ce; LuPO4:Yb; YAlO3:Ce; Yb2+; YbPO4; activator ions; carrier capture; carrier recombination energy; carrier trapping; charge state; ionizing radiation; nonradiative recombination; rare-earth-doped scintillator materials; recombination processes; single-configuration-coordinate model; Charge carrier processes; Charge carriers; Charge transfer; Chemistry; Conducting materials; Electron traps; Energy capture; Energy exchange; Physics; Pulse measurements;
Journal_Title :
Nuclear Science, IEEE Transactions on
