Orange-Reddish Light Emitting Phosphor GdVO4:Sm3+ Prepared by Solution Combustion Synthesis

The gadolinium vanadate doped with samarium (GdVO4:Sm3+) nanopowder was prepared by the solution combustion synthesis (SCS) method. After synthesis, in order to achieve the full crystallinity, the material was annealed in air atmosphere at 900 degrees C. Phase identification in the postannealed powder samples was performed by X-ray diffraction, and morphology was investigated by high-resolution scanning electron microscopy (SEM). Photoluminescence characterization of the emission spectrum and time-resolved analysis have been performed using the tunable laser optical parametric oscillator excitation and the streak camera. Several strong emission bands in the Sm3+ emission spectrum were observed, located at 567 nm ((4)G(5/2)-H-6(5/2)), 604 nm ((4)G(5/2)-H-6(7/2)), and 646 (654) nm ((4)G(5/2)-H-6(9/2)), respectively. The weak emission bands at 533 nm (F-4(3/2)-H-6(5/2)) and 706 nm ((4)G(5/2)-H-6(11/2)) and a weak broad luminescence emission band of VO43- were also observed by the detection system. We analyzed the possibility of using the host luminescence for two-color temperature sensing. The proposed method is improved by introducing the temporal dependence in the line intensity ratio measurements.