Surface passivation effect on structure, UV and visible emission of ZnNiPdO nanorods

Markedly enhanced near band edge ultraviolet fluorescence emission and significantly reduced defect related green emissions were also observed in ZnNiPdO nanorods capped with polyvinyl pyrrolidone (PVP). Under excitation at 325 nm, this rod like composites exhibited violet-blue defect emission. It is demonstrated that the surface modification by the capping agent PVP can dramatically change the blue emission of the nanorods. The strong UV extended violet-blue emission owes to the recombination of an electron in the zinc interstitial and a hole in the valence band with the addition of strong blue emission of PVP. Tailing effect in the bandgap was observed and found to obey Urbach rule. The X-ray diffraction studies confirmed the phase of formation and SEM demonstrates the hexagonal geometry of the nanorods.