Biexciton state causes photoluminescence fluctuations in CdSe/ZnS core/shell quantum dots at high photoexcitation densities

N. Yoshikawa, H. Hirori, H. Watanabe, Takao Aoki, T. Ihara, R. Kusuda, C. Wolpert, T. K. Fujiwara, A. Kusumi, Y. Kanemitsu, K. Tanaka

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    The excitation density dependence of photoluminescence (PL) blinking of single CdSe/ZnS quantum dots was studied by means of single-dot PL spectroscopy. As the excitation density increases, an intermediate state appears in addition to the highly emissive (ON) and nonemissive (OFF) states. The systematic study of the excitation density dependence of PL blinking behavior (PL intensity, probabilities of finding these states, time probability distributions, and PL spectra and lifetimes) suggests that the intermediate state can be attributed to a charged exciton (trion) state generated through biexciton generation and charging (ionization) of a quantum dot under a high-density excitation regime. Our results indicate that the biexciton generation is a precursor of the trion state and not of the OFF state.

    Original languageEnglish
    Article number155440
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume88
    Issue number15
    DOIs
    Publication statusPublished - 2013 Oct 31

    Fingerprint

    Photoexcitation
    photoexcitation
    Semiconductor quantum dots
    Photoluminescence
    quantum dots
    photoluminescence
    causes
    blinking
    excitation
    Photoluminescence spectroscopy
    Excitons
    Probability distributions
    Ionization
    charging
    excitons
    ionization
    life (durability)
    spectroscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Biexciton state causes photoluminescence fluctuations in CdSe/ZnS core/shell quantum dots at high photoexcitation densities. / Yoshikawa, N.; Hirori, H.; Watanabe, H.; Aoki, Takao; Ihara, T.; Kusuda, R.; Wolpert, C.; Fujiwara, T. K.; Kusumi, A.; Kanemitsu, Y.; Tanaka, K.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, No. 15, 155440, 31.10.2013.

    Research output: Contribution to journalArticle

    Yoshikawa, N, Hirori, H, Watanabe, H, Aoki, T, Ihara, T, Kusuda, R, Wolpert, C, Fujiwara, TK, Kusumi, A, Kanemitsu, Y & Tanaka, K 2013, 'Biexciton state causes photoluminescence fluctuations in CdSe/ZnS core/shell quantum dots at high photoexcitation densities', Physical Review B - Condensed Matter and Materials Physics, vol. 88, no. 15, 155440. https://doi.org/10.1103/PhysRevB.88.155440
    Yoshikawa, N. ; Hirori, H. ; Watanabe, H. ; Aoki, Takao ; Ihara, T. ; Kusuda, R. ; Wolpert, C. ; Fujiwara, T. K. ; Kusumi, A. ; Kanemitsu, Y. ; Tanaka, K. / Biexciton state causes photoluminescence fluctuations in CdSe/ZnS core/shell quantum dots at high photoexcitation densities. In: Physical Review B - Condensed Matter and Materials Physics. 2013 ; Vol. 88, No. 15.
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    abstract = "The excitation density dependence of photoluminescence (PL) blinking of single CdSe/ZnS quantum dots was studied by means of single-dot PL spectroscopy. As the excitation density increases, an intermediate state appears in addition to the highly emissive (ON) and nonemissive (OFF) states. The systematic study of the excitation density dependence of PL blinking behavior (PL intensity, probabilities of finding these states, time probability distributions, and PL spectra and lifetimes) suggests that the intermediate state can be attributed to a charged exciton (trion) state generated through biexciton generation and charging (ionization) of a quantum dot under a high-density excitation regime. Our results indicate that the biexciton generation is a precursor of the trion state and not of the OFF state.",
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    AU - Yoshikawa, N.

    AU - Hirori, H.

    AU - Watanabe, H.

    AU - Aoki, Takao

    AU - Ihara, T.

    AU - Kusuda, R.

    AU - Wolpert, C.

    AU - Fujiwara, T. K.

    AU - Kusumi, A.

    AU - Kanemitsu, Y.

    AU - Tanaka, K.

    PY - 2013/10/31

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    AB - The excitation density dependence of photoluminescence (PL) blinking of single CdSe/ZnS quantum dots was studied by means of single-dot PL spectroscopy. As the excitation density increases, an intermediate state appears in addition to the highly emissive (ON) and nonemissive (OFF) states. The systematic study of the excitation density dependence of PL blinking behavior (PL intensity, probabilities of finding these states, time probability distributions, and PL spectra and lifetimes) suggests that the intermediate state can be attributed to a charged exciton (trion) state generated through biexciton generation and charging (ionization) of a quantum dot under a high-density excitation regime. Our results indicate that the biexciton generation is a precursor of the trion state and not of the OFF state.

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