Photoluminescence enhancement in thin films of PbSe nanocrystals

C.G. Christova - Zdravkov, J.W. Stouwdam, T.J. Eijkemans, A. Silov, R.W. Heijden, van der, M. Kemerink, R.A.J. Janssen, H.W.M. Salemink

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Abstract

Remarkable photoluminescence enhancement (PLE) in submonolayer films of PbSe nanocrystals (NCs) upon continuous illumination was observed. The intensity increase from films on InP substrates was highest in vacuum, while for films on Si/ SiO2 substrates the PLE was stronger in air. The magnitude of the PLE was found to depend on the excitation intensity, being higher for a weaker irradiation power. The possible mechanisms behind the phenomenon of the PLE are discussed and it is suggested to originate mainly from charge trapping outside the NCs core.
Original languageEnglish
Article number121906
Pages (from-to)121906-1/3
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number12
DOIs
Publication statusPublished - 2008

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