Structural and optical characterization of NaBi1-x(WO4)2: x Sm3+phosphors for reddish orange light emitting applications

Abstract NaBi1-x(WO4)2: x Sm3+phosphors (x = 0.02, 0.04, 0.08, 0.10 and 0.20) were synthesized at 850° C via solid state reaction method. The crystal structure and phase analysis were performed using X-ray diffraction (XRD) technique and are isostructural with NaBi(WO4)2. The photoluminescence studies reveal that the phosphors exhibit excellent reddish- orange emission with short decay time of the order of millisecond on exciting with 404 nm. The obtained chromaticity coordinates (0.5903, 0.4023) are close to the Nichia corporation fabricated amber light emitting diode (LED) NSPAR 70BS. These results suggest the prepared phosphor to be a potential candidate for its use as reddish orange emitting material in white light emitting applications.