Surface and thermoluminescence study of Dy3+ doped Sr3B2O6 nanocrystalline phosphor Surface and thermoluminescence study of Dy3+ doped Sr3B2O6 nanocrystalline phosphor
1School of Physics, Shri Mata Vaishno Devi University, Katra 182320 (J&K), India
2Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
Adv. Mater. Lett., 2015, 6 (5), pp 402-406
Publication Date (Web): May 05, 2015
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In this letter, the thermoluminescence response and surface properties of Sr3B2O6:Dy3+ nanophosphor prepared by combustion method exposed to γ–rays are reported. The crystalline structure of nanophosphors was confirmed by X-ray powder diffraction. The result indicates rhombohedral nanocrystalline structure with an average grain size of 41 nm. The microstructure and morphology were studied by transmission electron microscopy, which show nanowire like structure with an average diameter of 42 nm. The samples were irradiated with a γ-dose using 60Co source in the range of 100 Gy - 5000 Gy. The kinetic parameter such as activation energy (E), order of kinetics (b), and frequency factor (s) of the main glow peaks of the Sr3B2O6:Dy3+ sample at 5000 Gy and different heating rates were determined using both the TLAnal program and Chen’s method. The effect of different heating rate at a fixed dose is discussed. X-ray photoelectron spectroscopy was used to study the surface chemical composition and the electronic states.
Nanocrystalline phosphors, XPS, thermoluminescence.