Ionic environment control of visible photo-luminescence from ZnO nanoparticles

Details Ionic environment control of visible photo-luminescence from ZnO nanoparticles Ionic environment control of visible photo-luminescence from ZnO nanoparticles

2008-07-10

arxiv.org/abs/0807.1575v1

Physics

Condensed Matter

Materials Science

3 pages including 4 figures

Scientific paper

10.1063/1.2987479

We report a novel effect that the visible photoluminescence (in the blue-green band) from ZnO anoparticles can be controlled by changing the ionic or polar nature of the medium in which the nanoparticles are dispersed. We find that the presence of sufficient amount of electrolytes can even quench the emission. We propose an explanation based on surface charge of the ZnO nanoparticles which control the band bending in the depletion layer at the surface of the anoparticles. The band bending in turn, decides the predominant nature of the visible emission. The explanation is validated by establishing a direct correlation between the visible emission and the zeta potential.

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