Synthesis and photoluminescence of Tb3+ Activated NaY(WO4)2 phosphors

Graphical abstract: The phosphor powders of NaY(WO{sub 4}){sub 2}:Tb{sup 3+} were prepared by solid state reaction. The dependence of luminescence intensity on the Tb{sup 3+} concentration was investigated. Highlights: ► We synthesize NaY(WO{sub 4}){sub 2}:Tb{sup 3+} phosphors by the solid-state reaction technique. ► We observe and explain the blue shifting of excitation peak positions of CTBs. ► The PL from {sup 5}D{sub 3} level become less probable with increasing the Tb{sup 3+} content. ► The PL intensity increases with Tb{sup 3+} content without concentration quenching. ► NaY(WO{sub 4}){sub 2}:Tb{sup 3+} has potential application as a green emitting phosphor in lamps. -- Abstract: The novel yellowish green phosphor powders of NaY(WO{sub 4}){sub 2} doped with Tb{sup 3+} were prepared by solid-state reaction. The powder samples were characterized by X-ray diffraction and photoluminescence. X-ray diffraction analysis showed that the phosphors sintered at 900 °C for 6 h were a pure NaY(WO{sub 4}){sub 2} phase for all the Tb{sup 3+} doping concentrations. The room temperature excitation spectra vary with the Tb{sup 3+} concentration and consist of an intense charge transfer band of WO{sub 4}{sup 2−} group and weak intra-4f{sup 8} transition absorption peaks of Tb{sup 3+} ions. The photoluminescence spectra, excited at themore » peak wavelengths of charge transfer bands, consist of the characteristic Tb{sup 3+} emission transitions from {sup 5}D{sub 3} and {sup 5}D{sub 4} excited levels to {sup 7}F{sub J} (J = 3–6) levels. The dependence of luminescence intensity on the Tb{sup 3+} concentration in NaY(WO{sub 4}){sub 2}:Tb phosphors was investigated.« less