Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111142
Title: Electronic Excitations and Luminescence of SrAlF5 Crystals Doped with Ce3+ Ions
Authors: Omelkov, S.
Pustovarov, V.
Kirm, M.
Ogorodnikov, I.
Isaenko, L.
Issue Date: 2010
Publisher: Elsevier BV
Citation: Electronic Excitations and Luminescence of SrAlF5 Crystals Doped with Ce3+ Ions / S. Omelkov, V. Pustovarov, M. Kirm et al. // Radiation Measurements. — 2010. — Vol. 45. — Iss. 3-6. — P. 292-294.
Abstract: This paper reports the results of a time-resolved photoluminescence and energy transfer processes study in Ce3+ doped SrAlF5 single crystals. Several Ce3+ centers emitting near 4 eV due to 5d-4f transitions of Ce3+ ions substituting for Sr2+ in non-equivalent lattice sites were identified. The lifetime of these transitions is in the range of 25-35 ns under intra-center excitation in the energy region of 4-7 eV at T = 10 K. An effective energy transfer from lattice defects to dopant ions was revealed in the - 7-11 eV energy range. Both direct and indirect excitation channels are efficient at room temperature. Excitons bound to dopants are revealed at T = 10 K under excitation in the fundamental absorption region above 11 eV, as well as radiative decay of self-trapped excitons resulting in luminescence near 3 eV. © 2009 Elsevier Ltd. All rights reserved.
Keywords: CE3+ IONS
ENERGY TRANSFER
SRALF5
TIME-RESOLVED LUMINESCENCE SPECTROSCOPY
5D-4F TRANSITIONS
ABSORPTION REGION
CE3+ IONS
DOPANT IONS
EFFECTIVE ENERGY
ELECTRONIC EXCITATION
ENERGY RANGES
ENERGY REGIONS
ENERGY TRANSFER PROCESS
EXCITATION CHANNELS
LATTICE DEFECTS
LATTICE SITES
RADIATIVE DECAY
ROOM TEMPERATURE
SELF-TRAPPED EXCITON
SRALF5
TIME-RESOLVED LUMINESCENCE SPECTROSCOPY
TIME-RESOLVED PHOTOLUMINESCENCE
CERIUM
CERIUM COMPOUNDS
DOPING (ADDITIVES)
ENERGY TRANSFER
EXCITONS
IONS
LUMINESCENCE
SPECTROSCOPY
SINGLE CRYSTALS
URI: http://hdl.handle.net/10995/111142
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 77955307232
ISSN: 1350-4487
metadata.dc.description.sponsorship: This work is partly supported by RFBR (07-02-00442) and BMBF (05KS8GUD/1). S. Omelkov acknowledges gratefully the Archimedes Foundation (Estonia) for a stipend supporting his stay at University of Tartu during his Ph.D. studies.
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