作者
Pragya Pandit, Shailendra Kumar, Manoj Mohapatra, Pargin Bangotra, Rohit Mehra, AK Singh
发表日期
2019/3
期刊
Luminescence
卷号
34
期号
2
页码范围
212-221
简介
In the current study, the structural and spectroscopic properties of phosphatic shale samples obtained from the Atomic Minerals Directorate for Exploration and Research were probed for potential use as a phosphor material. X‐ray diffraction and Raman and Fourier transform infrared spectroscopy revealed that the beneficiated phosphatic shale samples were primarily monophasic consisting of fluorapatite [Ca5(PO4)3F, (FAP)] with minor traces of haematite (α‐Fe2O3) and calcite (CaCO3). Energy dispersive X‐ray fluorescence revealed the presence of U, Eu, Dy and Tb in the FAP matrix substituted at Ca(I) and Ca(II) sites of FAP. A reduced optical direct band gap of 4.46 eV was calculated from the Tauc plot. Photoluminescence spectral studies revealed multicolour emissions (red, yellow, green and blue) on ultraviolet light excitation that were attributed to luminescence spectra from rare earth ions Eu3+, Tb3+, U4 …
引用总数
2019202020212022202322121
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