Thermostimulated luminescence properties of CaSO4:Dy and CaSO4:Tm phosphors annealed at high temperatures

✍ Scribed by A. R. Lakshmanan; D. Lapraz; H. Prévost; M. Benabdesselam

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 159 KB
• Volume: 202
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200406911

✦ Synopsis

Abstract

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)