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

Volume

61

Issue

1

fYear

2014

fDate

Feb. 2014

Firstpage

290

Lastpage

292

Abstract

The role of energy transfer from Gd3⁺ to Ce³⁺ activator in the formation of the luminescence yield and kinetics of Lu_2xGd_2-2xSiO₅: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; Lu_2xGd_2-2xSiO₅:Ce; Lu_2xGd_2-2xSiO₅: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;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2013.2278341

Filename

6636094