Title
Electron paramagnetic resonance study of rare-earth related centres in <tex>$K_{2}YF_{5}:Tb^{3+}$</tex> thermoluminescence phosphorsElectron paramagnetic resonance study of rare-earth related centres in <tex>$K_{2}YF_{5}:Tb^{3+}$</tex> thermoluminescence phosphors
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Experimental condensed matter physics (ECM)
Publication type
article
Publication
Amsterdam,
Subject
Physics
Source (journal)
Optical materials. - Amsterdam
Volume/pages
33(2011):6, p. 865-871
ISSN
0925-3467
ISI
000289390000023
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Rare-earth related centres have been investigated in K2YF5:Tb3+ crystals, exhibiting thermoluminescence (TL) below and above room temperature (RT), using electron paramagnetic resonance (EPR) spectroscopy at Q (34 GHz) and W-band (94 GHz). The spectra have been studied prior to irradiation, after exposure in the kGy range to X-rays at 77 K and subsequent pulse annealing up to 570 K. In addition to Gd3+, previously studied in detail, we identified Er3+ and Yb3+ centres as accidental impurities in as-grown crystals and determined their effective g tensors. The EPR spectra of irradiated and annealed crystals provide evidence for the production of at least three distinct Tb-related trapped hole centres, two of which could definitely be identified as Tb4+. Hence, we prove that the Tb3+ activator ions also act as hole traps in K2YF5. Pulse annealing experiments indicate that the TL above RT results from thermal release of electrons, recombining at these Tb4+ ions.
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