Time-resolved luminescence and excitation spectroscopy of Co-doped Gd 3 Ga 3 Al 2 O 12 scintillating crystals.

Autor: Pankratova V; Institute of Solid State Physics, University of Latvia, 8 Kengaraga iela, Riga, LV-1063, Latvia., Kozlova AP; National University of Science and Technology 'MISiS', Leninsky Prospekt 4, 119049, Moscow, Russia., Buzanov OA; OJSC 'Fomos-Materials' Co, Buzheninova street 16, 107023, Moscow, Russia., Chernenko K; MAX IV Laboratory, Lund University, PO BOX 118, 221 00, Lund, Sweden., Shendrik R; Vinogradov Institute of Geochemistry, SB RAS, 1a Favorskii Street, 664033, Irkutsk, Russia., Šarakovskis A; Institute of Solid State Physics, University of Latvia, 8 Kengaraga iela, Riga, LV-1063, Latvia., Pankratov V; Institute of Solid State Physics, University of Latvia, 8 Kengaraga iela, Riga, LV-1063, Latvia. vladimirs.pankratovs@cfi.lu.lv.; National University of Science and Technology 'MISiS', Leninsky Prospekt 4, 119049, Moscow, Russia. vladimirs.pankratovs@cfi.lu.lv.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Nov 23; Vol. 10 (1), pp. 20388. Date of Electronic Publication: 2020 Nov 23.
DOI: 10.1038/s41598-020-77451-x
Abstrakt: Cerium doped Gd 3 Ga 3 Al 2 O 12 (GGAG) single crystals as well as GGAG:Ce single crystals co-doped by divalent (Mg 2+ , Ca 2+ ) and tetravalent (Zr 4+ , Ti 4+ ) ions have been studied by means of time-resolved luminescence as well as the excitation luminescence spectroscopy in vacuum ultraviolet (VUV) and soft X-ray (XUV) spectral range. Tunable laser excitation was applied for time-resolved experiments in order to obtain luminescence decay curves under excitations in Ce 3+ , Gd 3+ and excitonic absorption bands. The influence of the co-dopant ions on the Ce 3+ luminescence decay kinetics is elucidated. The fastest luminescence decay was observed for the Mg 2+ co-doped crystals under any excitation below bandgap energy indicating the perturbation of the 5d states of Ce 3+ by Mg 2+ ions. Synchrotron radiation was utilized for the luminescence excitation in the energy range from 4.5 to 800 eV. Special attention was paid to the analysis of Ce 3+ excitation spectra in VUV and XUV spectral range where multiplication of electronic excitation (MEE) processes occur. Our results demonstrated that GGAG:Ce single crystals co-doped by Mg 2+ ions as well as the GGAG:Ce crystal annealed in vacuum reveal the most efficient excitation of Ce 3+ emission in VUV-XUV excitation range. The role of intrinsic defects in MEE processes in the co-doped as well as in the annealed GGAG:Ce single crystals is discussed.
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje