Abstract
Correlation between the maximum wavelength and the line width in the emission of a single semiconductor colloidal quantum dot at different temperatures
Highlights
The very first measurements [1] of the spectrally resolved photoluminescence of single colloidal semiconductor quantum dots CdSe (QDs) revealed the phenomenon of very slow spectral diffusion (SD) with a characteristic time scale in order of hundred seconds
Two optical schemes: wide-field and scanning confocal schemes were combined in one microscope in order to simplify procedure of single quantum dots preliminary searching and sequential measuring of fluorescence spectra of the selected QD
Sample temperature was controlled by LakeShore temperature controller and regulated by Peltier element attached to the sample
Summary
The very first measurements [1] of the spectrally resolved photoluminescence of single colloidal semiconductor quantum dots CdSe (QDs) revealed the phenomenon of very slow spectral diffusion (SD) with a characteristic time scale in order of hundred seconds. A unique spectroscopic experiment on single QD under slow heating and cooling was carried out by our group. Fluorescence images and spectra of single quantum dots were measured via home-build fluorescence microscope equipped by prism spectrometer. Two optical schemes: wide-field and scanning confocal schemes were combined in one microscope in order to simplify procedure of single quantum dots preliminary searching (by fluorescence image processing and antibunching determination) and sequential measuring of fluorescence spectra of the selected QD.
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