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• W1994446368 abstract "Ca3(PO4)2:Gd3+,Pr3+ phosphors with different concentrations of Gd3+ and Pr3+ were prepared by combustion process using metal nitrates as precursors and urea as fuel. The phosphors were characterized by X-ray diffraction (XRD), Scanning electron microscopy, Time of Flight-Secondary Ion Mass Spectrometry, ultraviolet–visible and photoluminescence (PL) spectroscopies. The XRD patterns were consistent with the standard rhombohedral phase of Ca3(PO4)2 referenced in JCPDS Card No. 70-2065. The average crystallite size calculated using the Scherrer equation at different urea masses was in the range of ∼60–120 nm. The PL excitation spectra of Ca3(PO4)2:Gd3+ and Ca3(PO4)2:Pr3+ exhibited peaks at 220–280 and 300–490 nm associated with the f → f transitions of Gd3+ and Pr3+ respectively. The ultraviolet B (UVB) emission resulting from the 6P7/2 → 8S7/2 transition of Gd3+ was observed at 313 nm when the Ca3(PO4)2:Gd3+ phosphor was excited at a wavelength of 274 nm using a monochromatized xenon lamp. Upon Pr3+ co-doping, the excitation peaks due to Gd3+ and Pr3+ f → f transitions were suppressed and an intense broad excitation peak ascribed to the 4f → 4f5d transitions of Pr3+ was observed at 227 nm. The peak intensity of the UVB emission at 313 nm was shown to improve considerably when the Gd3+ and Pr3+ co-doped systems were excited at the wavelength of 227 nm suggesting that the Pr3+ is a good sensitizer of the 313 nm narrow line UVB emission from Gd3+." @default.
• W1994446368 created "2016-06-24" @default.
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• W1994446368 date "2014-05-01" @default.
• W1994446368 modified "2023-09-25" @default.
• W1994446368 title "TOF SIMS analysis and enhanced UVB photoluminescence by energy transfer from Pr3+ to Gd3+ in Ca3(PO4)2:Gd3+,Pr3+ phosphor prepared by urea assisted combustion" @default.
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• W1994446368 doi "https://doi.org/10.1016/j.jallcom.2014.01.088" @default.
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