Inorganic Surface Passivation of PbS Nanocrystals resulting in Strong Photoluminescent Emission

Details Inorganic Surface Passivation of PbS Nanocrystals resulting in Strong Photoluminescent Emission Inorganic Surface Passivation of PbS Nanocrystals resulting in Strong Photoluminescent Emission

2003-03-14

arxiv.org/abs/cond-mat/0303267v1

Physics

Condensed Matter

Materials Science

Preprint, 23 pages, 6 figures

Scientific paper

10.1088/0957-4484/14/9/311

Strong photoluminescent emission has been obtained from 3 nm PbS nanocrystals in aqueous colloidal solution, following treatment with CdS precursors. The observed emission can extend across the entire visible spectrum and usually includes a peak near 1.95 eV. We show that much of the visible emission results from absorption by higher-lying excited states above 3.0 eV with subsequent relaxation to and emission from states lying above the observed band-edge of the PbS nanocrystals. The fluorescent lifetimes for this emission are in the nanosecond regime, characteristic of exciton recombination.

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