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Direct observation of mixed-parity excited states in surface-passivated PbS nanocrystals

Mark J Fernée, Andrew Watt, Jamie Warner, Norman Heckenberg and Halina Rubinsztein-Dunlop

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Photoluminescent emission is observed from surface-passivated PbS nanocrystals following the two-photon excitation of high-energy excitonic states. The emission appears directly at the excitation energy with no detectable Stokes-shift for a wide range of excitation energies. The observation of direct emission from states excited by two-photon absorption indicates that the parity of the excited states of surface-passivated PbS nanocrystals is partially mixed.


PACS

78.67.Bf Nanocrystals and nanoparticles

78.55.Hx Other solid inorganic materials

71.35.-y Excitons and related phenomena

81.65.Rv Passivation

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 9 (September 2004)

Received 9 June 2004

Published 13 August 2004



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