Temperature dependent recombination dynamics in InP/ZnS colloidal nanocrystals

Roza Shirazi, Oleksii Kopylov, András Kovács, Beata Kardynal

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In this letter, we investigate exciton recombination in InP/ZnS core-shell colloidal nanocrystals over a wide temperature range. Over the entire range between room temperature and liquid helium temperature, multi-exponential exciton decay curves are observed and well explained by the presence of bright and dark exciton states, as well as defect states. Two different types of defect are present: one located at the core-shell interface and the other on the surface of the nanocrystal. Based on the temperature dependent contributions of all four states to the total photoluminescence signal, we estimate that the four states are distributed within a 20 meV energy band in nanocrystals that emit at 1.82 eV.
Original languageEnglish
JournalApplied Physics Letters
Issue number9
Pages (from-to)091910
Number of pages4
Publication statusPublished - 2012

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Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


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