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Thermostimulated luminescence properties of CaSO 4 :Dy and CaSO 4 :Tm phosphors annealed at high temperatures
Author(s) -
Lakshmanan A. R.,
Lapraz D.,
Prévost H.,
Benabdesselam M.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200406911
Subject(s) - phosphor , luminescence , annealing (glass) , analytical chemistry (journal) , irradiation , materials science , thermoluminescence , sintering , photostimulation , nuclear chemistry , radiochemistry , chemistry , mineralogy , optoelectronics , metallurgy , nuclear physics , physics , chromatography , biochemistry
Pre‐irradiation annealing at temperatures ≥800 °C in air drastically reduces the 230 °C dosimetric thermostimulated luminescence (TSL) peak in CaSO 4 :Dy/Tm and simultaneously the 60 °C and 120 °C peaks are strongly enhanced. In samples sintered at 1000 °C, the dosimetric peak vanished totally while the low temperature peaks exhibit a high TSL sensitivity. Moreover, the PL intensities decrease drastically on high temperature sintering; a reduction by as much as 75% is seen at 1000 °C. Photo‐transfer studies indicate that the 60 °C peak might originate from electron release while the 120 °C peak from hole release. These two low temperature TSL peaks could have potential applications for photostimulation. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)