Luminescence quenching by manganese ions in MO–CaF2–B2O3 glasses

Thermoluminescence (TL) characteristics of X-ray irradiated calcium fluoro borate glasses mixed with three different alkali oxide modifiers viz., Li₂O, Na₂O and K₂O have been studied in the temperature range 303–600 K; all the glasses have exhibited single TL peak at 485, 541 and 497 K respectively. The glasses containing Na₂O as modifier has exhibited the maximum TL light output. The doping of manganese oxide by a small concentration (0.2 mol%) in all these glasses has been observed to inhibit TL light output drastically with shifting of peak positions towards lower temperatures. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen’s formulae. The probable mechanism responsible for quenching of TL emission by manganese ions in these glasses has been suggested with the aid of optical absorption, IR spectra and differential scanning calorimetric studies.