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Unraveling Trapping Defects Distribution using Thermoluminescence in Gamma‐Irradiated SrZnO 2 :Dy Nanophosphors
Author(s) -
Jain Megha,
Kumar Akshay,
Vij Ankush,
Thakur Anup
Publication year - 2021
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.202100063
Subject(s) - thermoluminescence , trapping , doping , irradiation , analytical chemistry (journal) , materials science , quenching (fluorescence) , raman spectroscopy , luminescence , atomic physics , chemistry , fluorescence , optics , physics , optoelectronics , ecology , chromatography , nuclear physics , biology
Thermoluminescence (TL) analysis of gamma‐irradiated SrZnO 2 :Dy nanophosphors elucidates the presence of various trapping centers in forbidden band. Raman and Fourier‐transformed infrared spectra indicate effect on vibrational structure upon doping. Complex glow curves are obtained at varying gamma radiation doses, exhibiting glow features in low (50–180 °C) and high (220–400 °C) temperature regions. The deconvolution of glow curves indicates the presence of TL peaks at ≈100, 143, 202, 269, and 337 °C. The effect of Dy doping is observed as emergence of new glow feature at ≈143 °C. The substitution of trivalent Dy into SrZnO 2 host having divalent cations is proposed to be creatingDy X 1 +(X = Sr, Zn) electron traps andV X 2 −hole traps, along with hitherto existing intrinsic defects. The concentration quenching of TL signal is perceived at 3 mol% Dy doping, whereas comparing glow curves for all samples at saturation dose indicate quenching of low‐ and high‐temperature glow features at different doping concentrations. The theoretical track interaction model and empirical three trap one recombination center (3T1R) model is used to explain former and latter effects, respectively. A schematic band model is proposed to predict the trap distribution upon Dy inclusion, responsible for observed TL in SrZnO 2 :Dy nanophosphors.