Phototransferred thermoluminescence of rose quartz: Measurement and analysis

Abstract

Phototransferred thermoluminescence (PTTL) of rose quartz induced by 470 nm blue-, 525 nm green- and 405 nm UV-light is reported. Although its conventional TL glow curve measured at 1 °C s⁻¹ during heating to 500 °C has five peaks (labelled I–V), only peaks I-IV are reproduced under phototransfer. All four peaks re-appear owing to phototransfer by 405 nm illumination whereas only peaks I-II are regenerated by 470 nm and 525 nm light. The dependence of PTTL intensity on duration of illumination for peaks I and II is analysed using phenomenological and kinetics models as systems of acceptor and donors with the number of the latter determined by experiment. The intensity of PTTL induced from deep electron traps increases with temperature of illumination with an activation energy of thermal assistance of 0.20 ± 0.01 eV irrespective of the illumination wavelength but decreases at elevated temperatures with an activation energy of thermal quenching whose value depends on the illumination wavelength. The extent to which electron traps affect the PTTL as acceptors or donors has also been studied.