Photoluminescence of Ca x Sr1−x (NbO3)2:Pr3+ (0 ≤ x ≤ 1) Nanophosphors
Abstract:Nanoparticles of Ca x Sr1−x (NbO3)2 doped with Pr3+ have been synthesized by sol–gel method. Particles have sizes in the range of 50–70 nm. The Ca x Sr1−x (NbO3)2:Pr3+ phosphors showed a white emission under the near-ultraviolet excitation (254 nm). There is a large photoluminescence enhancement of the Ca x Sr1−x (NbO3)2:Pr3+ phosphor samples when added with 0.5% KCl. X-ray diffraction (XRD), transmission electron microscope (TEM), photo luminescent (PL) analysis were utilized to characterize the Ca x Sr1−x (NbO3)2:Pr3+ particles. The concentration quenching of the samples was discussed as well. The optical concentration and the calcination temperature were 0.8 mol% of Ca2+ and 900 °C for these phosphors, respectively, the possible mechanism was discussed. Ca x Sr1−x (NbO3)2:Pr3+ is a promising white phosphor under near-ultraviolet excitation for various applications.
Document Type: Research Article
Publication date: November 1, 2011
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