Thermoluminescence and EPR studies of nanocrystalline Ndub>2ub>Oub>3ub>:Niup>2+up> phosphor

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• 作者：B. Umeshup>aup>up> ; up>up>bup> ; B. Eraiahup>bup> ; H. Nagabhushanaup>cup>up> ; up>up>bhushanvlc@gmail.comup> ; S.C. Sharmaup>cup> ; D.V. Sunithaup>cup> ; B.M. Nagabhushanaup>dup> ; C. Shivakumaraup>eup> ; J.L. Raoup>fup> ; R.P.S. Chakradharup>gup>up> ; up>
• 关键词：Nanophosphor ; Thermoluminescence ; Gamma irradiation ; XRD ; SEM ; EPR
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：July, 2012
• 卷：93
• 期：Complete
• 页码：228-234
• 文件大小：685 K

摘要

Nanocrystalline Ndub>2ub>Oub>3ub>:Niup>2+up> (2 mol%) phosphor has been prepared by a low temperature (鈭?00 掳C) solution combustion method, in a very short time (<5 min). Powder X-ray diffraction results confirm the single hexagonal phase of nanopowders. Scanning electron micrographs show that nanophosphor has porous nature and the particles are agglomerated. Transmission electron microscopy confirms the nanosize (20-25 nm) of the crystallites. The electron paramagnetic resonance (EPR) spectrum exhibits a symmetric absorption at g 鈮?#xA0;2.77 which suggests that the site symmetry around Niup>2+up> ions is predominantly octahedral. The number of spins participating in resonance (N) and the paramagnetic susceptibility (蠂) has been evaluated. Raman study show major peaks, which are assigned to Fub>gub> and combination of Aub>gub> + Eub>gub> modes. Thermoluminescence (TL) studies reveal well resolved glow peaks at 169 掳C along with shoulder peak at around 236 掳C. The activation energy (E in eV), order of kinetics (b) and frequency factor (s) were estimated using glow peak shape method. It is observed that the glow peak intensity at169 掳C increases linearly with 纬-dose which suggest that Ndub>2ub>Oub>3ub>:Niup>2+up> is suitable for radiation dosimetry applications.