Articles
  • Improved luminescence properties of Na2TiSiO5 phosphor by the Ge4+ doping in the crystal lattice

  • Young Ji Parka, Sun Woog Kima,*, Kazuma Sugimotob, Takuya Hasegawac, Koudai Tanimab, Kazuyoshi Uematsub, Kenji Todab,* and Mineo Satod

  • aElectronic Convergence Materials Division, Optic & Display Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Korea
    bGraduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan
    cDepartment of Marine Resource Science, Faculty of Agriculture and Marine Science, Kochi University, 200 Otsu, Monobe, Nankoku City, Kochi 783-8502, Japan
    dDepartment of Chemistry and Chemical Engineering, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan

Abstract

Rare earth free white emitting Na2TiSi1−xGexO5 phosphors were synthesized by a conventional solid-state reaction method, and the photoluminescence properties were characterized. The phosphors obtained in the present study showed broad bluish-white emission with a peak at 485 nm due to the charge transfer transition between O2− and Ti4+ and the emission peak intensity was effectively enhanced by the Ge4+ doping in the Na2TiSiO5 crystal lattice. The emission peak intensity of Na2TiSi0.5Ge0.5O5 was 1.35 times higher than that of Na2TiSiO5 and the CIE chromaticity coordinate values for the phosphor were x = 0.29 and y = 0.38.


Keywords: White emission phosphor, Rare earth free, Na2TiSiO5

This Article

  • 2019; 20(5): 460-463

    Published on Oct 31, 2019

  • 10.36410/jcpr.2019.20.5.460
  • Received on Dec 10, 2018
  • Revised on Jan 15, 2019
  • Accepted on May 9, 2019

Correspondence to

  • Sun Woog Kim a, Kenji Toda b

  • aElectronic Convergence Materials Division, Optic & Display Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Korea
    bGraduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan
    Tel: +82-55-792-2487, Fax: +82-55-792-2492(Sun Woog Kim)
    Tel: +81-25-262-6771, Fax: +81-25-262-6771(Kenji Toda)

  • E-mail: skim80@kicet.re.kr, ktoda@eng.niigata-u.ac.jp