Synthesis of Metal Ion Doped Sr2CeO4 by Hydrothermal Method and Its Luminescent Properties

Abstract

Blue-white emitting phosphor Sr₂CeO₄ and a series of Sr₂CeO₄:M(M = Mg, Ca, Zn, Al) were synthesized by hydrothermal method using (NH₄)₂CO₃ as the precipitation agent. Phase structure and luminescence properties of the as-synthesized phosphors were investigated by X-ray diffraction and fluorescence spectrophotometry respectively. Results show that Sr₂CeO₄:M (M = Mg, Ca, Zn, Al) phosphors have the same orthorhombic crystal structure as that of Sr₂CeO₄. Doping with metal ions has little effect on shape and position of peaks in emission spectrum of Sr₂CeO₄, which is located in the range of 400-600 nm with main peak at 466 nm and ascribed to the f®t_1g transition of Ce⁴⁺ ions. Among these metal ions, doping with Zn²⁺ or Mg²⁺ can effectively enhance the photoluminescence of Sr₂CeO₄ phosphor, the appropriate doping concentration of Zn²⁺ and Mg²⁺ is 5 and 4 %, respectively. Moreover, a red-shift is found in the excitation spectrum of Sr₂CeO₄ phosphor after doping with Zn²⁺ or Mg²⁺.