Characterizing quantum-dot blinking using noise power spectra

Matthew Pelton, David G. Grier, Philippe Guyot-Sionnest

    Research output: Contribution to journalArticlepeer-review


    The colloidal semiconductor quantum-dot blinking was analyzed using noise power spectra. By exciting the quantum-dot (QDs) with stable laser light having a wavelength of 532 nm, the noise measurements were made at room temperature. It was shown that fluctuations in the fluorescence from microscopic ensembles of colloidal semiconductor quantum dots have the spectral form of 1/f noise. The results show that the measured power spectral density reflects the fluorescence intermittency of individual dots with power-law distribution of 'on' and 'off' times and can thus serve as a simple method for characterizing such blinking behavior.

    Original languageEnglish (US)
    Pages (from-to)819-821
    Number of pages3
    JournalApplied Physics Letters
    Issue number5
    StatePublished - Aug 2 2004

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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