Abstract
Thermally stimulated luminescence (TSL) and electron paramagnetic resonance (EPR) studies were carried out on gamma-irradiated europium-doped yttrium borate samples in the temperature range 300-600 K. TSL studies showed the presence of two glow peaks, a relatively weaker one at 390 K and an intense one at around 550 K. Room-temperature EPR spectrum of irradiated samples revealed the formation of two hole trapped radicals, namely, BO32- and O2-. Temperature variation studies showed drastic reduction in the EPR signal intensities of these radicals around 390 and 550 K indicating thermal destruction of O2- and BO32- radicals, respectively. The observed TSL emission is caused by the recombination of thermally released holes from O2- and BO32- radical ions with electrons. The energy released in electron-hole recombination process is used for the excitation of Eu3+ ion resulting in TSL glow peaks. TSL emission studies confirmed that Eu3+ acts as luminescent center for both the peaks.
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Anitha, M., Mohapatra, M., Kadam, R.M. et al. Thermally stimulated luminescence and electron paramagnetic resonance studies of Eu3+-doped yttrium borate. Journal of Materials Research 21, 1117–1123 (2006). https://doi.org/10.1557/jmr.2006.0134
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DOI: https://doi.org/10.1557/jmr.2006.0134