Two-Fold Emission From the S-Shell of PbSe/CdSe Core/Shell Quantum Dots

D Grodzinska, WH Evers, L Dorland, J van Rijssel, MA van Huis, A. Meijerink, CD Donega, D Vanmaekelbergh

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    The optical properties of PbSe/CdSe core/shell quantum dots with core sizes smaller than 4 nm in the 5300 K range are reported. The photoluminescence spectra show two peaks, which become increasingly separated in energy as the core diameter is reduced below 4 nm. It is shown that these peaks are due to intrinsic exciton transitions in each quantum dot, rather than emission from different quantum dot sub-ensembles. Most likely, the energy separation between the peaks is due to inter-valley coupling between the L-points of PbSe. The temperature dependence of the relative intensities of the peaks implies that the two emitting states are not in thermal equilibrium and that dark exciton states must play an important role.
    Original languageEnglish
    Pages (from-to)3493-3501
    Number of pages9
    JournalSmall
    Volume7
    Issue number24
    Publication statusPublished - 2011

    Keywords

    • CWTS JFIS >= 2.00

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