M J Fernée et al 2003 Nanotechnology 14 991 doi:10.1088/0957-4484/14/9/311
M J Fernée, A Watt, J Warner, S Cooper, N Heckenberg and H Rubinsztein-Dunlop
Show affiliationsStrong 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.
78.55.Hx Other solid inorganic materials
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 9 (September 2003)
Received 14 March 2003, in final form 3 June 2003
Published 11 August 2003
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