Ultra Long-Lived Radiative Trap States in CdSe Quantum Dots

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Abstract

Surface states and traps play an important role in the photophysics of colloidal quantum dots. These states typically lead to large red-shifted photoluminescence. We have used steady-state and time-resolved spectroscopic techniques to investigate the nature of the traps and their lifetimes in colloidal CdSe quantum dots. We conclude that at least two different types of traps contribute to the photoluminescence. The trapping is more pronounced at higher excitation energies compared to the band edge excitation. Hole trapping is dominant in CdSe quantum dots. The time-resolved photoluminescence and pump–probe measurements show that the trapped holes live for longer than tens of microseconds at room temperature.

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Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)21682-21686
JournalJournal of Physical Chemistry C
Volume118
Issue number37
StatePublished - 2014
Peer-reviewedYes

Bibliographic note

Authors Mohamed Abdellah and Khadga Karki contributed equally to the article. The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)