Jamie H Warner et al 2005 Nanotechnology 16 175 doi:10.1088/0957-4484/16/2/001
Jamie H Warner, Elizabeth Thomsen, Andrew R Watt, Norman R Heckenberg and Halina Rubinsztein-Dunlop
Show affiliationsPbS nanocrystals are synthesized using colloidal techniques and have their surfaces capped with oleic acid. The absorption band edge of the PbS nanocrystals is tuned between 900 and 580 nm. The PbS nanocrystals exhibit tuneable photoluminescence with large non-resonant Stokes shifts of up to 500 meV. The magnitude of the Stokes shift is found to be dependent upon the size of PbS nanocrystals. Time-resolved photoluminescence spectroscopy of the PbS nanocrystals reveals that the photoluminescence has an extraordinarily long lifetime of 1 µs. This long fluorescence lifetime is attributed to the effect of dielectric screening similar to that observed in other IV–VI semiconductor nanocrystals.
78.67.Bf Nanocrystals and nanoparticles
Issue 2 (February 2005)
Received 9 November 2004, in final form 30 November 2004
Published 23 December 2004
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