Title :
Energy Relaxation in LSO and LGSO Crystals Studied in the VUV Range
Author :
Kamenskikh, Irina A. ; Belsky, Andrei N. ; Gektin, A.V. ; Limonova, Marina V. ; Neicheva, Svetlana ; Sidletskiy, Oleg C.
Author_Institution :
Phys. Dept., M.V. Lomonosov Moscow State Univ., Moscow, Russia
Abstract :
The role of energy transfer from Gd3+ to Ce3+ activator in the formation of the luminescence yield and kinetics of Lu2xGd2-2xSiO5:Ce (LGSO) mixed crystals has been studied by VUV spectroscopy including temperature dependent time-resolved measurements of luminescence excitation and emission spectra and luminescence kinetics in the excitation energy range 4 to 25 eV at the SUPERLUMI station of HASYLAB, DESY. Improved scintillation yield as well as suppressed afterglow that can be achieved by appropriate choice of Lu/Gd ratio as well as of Ce-concentration were suggested to result from an additional channel of energy relaxation via Gd-states, which appears in LGSO. The role of Ca-codoping is discussed.
Keywords :
calcium; cerium; gadolinium compounds; lutetium compounds; photoluminescence; scintillation; time resolved spectra; Lu2SiO5:Ce; Lu2xGd2-2xSiO5:Ce; Lu2xGd2-2xSiO5:Ce,Ca; VUV range; VUV spectroscopy; afterglow; electron volt energy 4 eV to 25 eV; emission spectra; energy relaxation; energy transfer; excitation energy; luminescence excitation; luminescence kinetics; luminescence yield; mixed crystals; scintillation yield; temperature dependent time-resolved measurements; Absorption; Cerium; Crystals; Energy exchange; Kinetic theory; Luminescence; Temperature measurement; Afterglow suppression; LGSO; energy transfer;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2013.2278341
