期刊
NANOTECHNOLOGY
卷 14, 期 9, 页码 991-997出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/14/9/311
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Strong photoluminescent emission has been obtained from 3 urn 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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