title: Preparation and luminescence properties of ZnO:Ga - polystyrene composite scintillator.
abstract: Highly luminescent ZnO:Ga-polystyrene composite (ZnO:Ga-PS) with ultrafast subnanosecond decay was prepared by homogeneous embedding the ZnO:Ga scintillating powder into the scintillating organic matrix. The powder was prepared by photo-induced precipitation with subsequent calcination in air and Ar/H2atmospheres. The composite was subsequently prepared by mixing the ZnO:Ga powder into the polystyrene (10 wt% fraction of ZnO:Ga) and press compacted to the 1 mm thick pellet. Luminescent spectral and kinetic characteristics of ZnO:Ga were preserved. Radioluminescence spectra corresponded purely to the ZnO:Ga scintillating phase and emission of polystyrene at 300-350 nm was absent. These features suggest the presence of non-radiative energy transfer from polystyrene host towards the ZnO:Ga scintillating phase which is confirmed by the measurement of X-ray excited scintillation decay with picosecond time resolution. It shows an ultrafast rise time below the time resolution of the experiment (18 ps) and a single-exponential decay with the decay time around 500 ps.
authors.forename: Hana
authors.initials: H
authors.lastname: Burešová
authors.forename: Lenka
authors.initials: L
authors.lastname: Procházková
authors.forename: Rosana Martinez
authors.initials: RM
authors.lastname: Turtos
authors.forename: Vítězslav
authors.initials: V
authors.lastname: Jarý
authors.forename: Eva
authors.initials: E
authors.lastname: Mihóková
authors.forename: Alena
authors.initials: A
authors.lastname: Beitlerová
authors.forename: Radek
authors.initials: R
authors.lastname: Pjatkan
authors.forename: Stefan
authors.initials: S
authors.lastname: Gundacker
authors.forename: Etiennette
authors.initials: E
authors.lastname: Auffray
authors.forename: Paul
authors.initials: P
authors.lastname: Lecoq
authors.forename: Martin
authors.initials: M
authors.lastname: Nikl
authors.forename: Václav
authors.initials: V
authors.lastname: Čuba