Optical characterization of Bi doped SrS nanophosphors

Optical properties of Bi3+ doped SrS nanophosphors synthesized by solid state diffusion method in the presence of sodium thiosulfate as a flux have been reported. UV–vis absorption and photoluminescence (PL) spectra of SrS phosphors doped with trivalent Bi3+ ions either alone or in combination with charge compensating ions, were also studied. These studies reflect that the incorporation of Bi3+ into host lattice is facilitated by the charge compensating Na+ ions. PL emission for SrS:Bi shows a peak at 481 nm at an excitation wavelength of 430 nm, which is attributed to the transition from the 3P1 to 1S0 states of Bi3+. We have also investigated the effect of different dopant concentrations on PL emission intensity.