Inorganic surface passivation of PbS nanocrystals resulting in strong photoluminescent emission

Journal article

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.

Authors: Fernee, M; Watt, A; Warner, J; Cooper, S; Heckenberg, N

• Publication status: Published
• Journal: NANOTECHNOLOGY
• Volume: 14
• Issue: 9
• Pages: 991-997
• Publication date: 2003-09-01
• DOI: 10.1088/0957-4484/14/9/311
• EISSN: 1361-6528
• ISSN: 0957-4484
• Language: English