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      https://www.ias.ac.in/article/fulltext/boms/043/0051

    • Keywords

       

      Europium-doped tellurooxyphosphate; photoluminescence; CT band.

    • Abstract

       

      Eu$^{3+}$ photoluminescence (PL) is studied in the tellurooxyphosphate, Ba$_2$TeO(PO$_4$)$_2$, host. A series of phosphor compositions with varying concentrations of Eu$^{3+}$ dopant in Ba$_2$TeO(PO$_4$)$_2$ are synthesized by high temperature solid-state reaction and the PL spectra are recorded. Under 395 nm wavelength excitation, the emission spectrum shows a single peak corresponding to the non-degenerate transition, ${}^5$D$_0$ $\to$ ${}^7$F$_0$ indicating that Eu$^{3+}$ preferentially occupies a singlecrystallographic site. The peak due to the degenerate hypersensitive ${}^5$D$_0$ $\to$ ${}^7$F$_2$ electric dipole transition of Eu$^{3+}$ in theemission spectrum indicates that the site occupied by Eu$^{3+}$ in the tellurooxyphosphate host lattice is non-centrosymmetric. The CIE coordinate values are $x = 0.61$ and $y = 0.34$ and are found to be close to the values of the reference phosphor Y$_2$O$_3$:Eu$^{3+}$.

    • Author Affiliations

       

      K MOHANRAO1 HANSNATH TIWARI2 S ASIRI NAIDU3 U V VARADARAJU1

      1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
      2. Department of Applied Science, Madhav Institute of Technology and Science, Gwalior 474005, India
      3. Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, Nuzvid 521202, India
    • Dates

       
  • Bulletin of Materials Science | News

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