Inorganic Surface Passivation of PbS Nanocrystals resulting in Strong Photoluminescent Emission

Preprint

14 March 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0303267

Abstract

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.

Keywords

PHOTOLUMINESCENT EMISSION
STRONG PHOTOLUMINESCENT
SURFACE PASSIVATION
INORGANIC SURFACE
PBS NANOCRYSTALS
RECOMBINATION

All Related Versions

Version 1, 2003-03-14, ArXiv
Published version: Nanotechnology, 14 (9), 991.