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.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)