AI Article Synopsis
- By optimizing detection techniques, we found that the fluorescence decay spectrum of colloidal CdSe-CdS/ZnS quantum dots shows a single exponential decay immediately post-photoexcitation, indicating energy relaxation from a high-energy exciton state to its ground state.
- The long decay time of fluorescence follows a β/t(2) pattern, where β represents the time taken for the ground-state exciton to recombine radiatively.
- Our results establish a clear connection between fluorescence decay measurements and the underlying photophysics of quantum dots, opening new avenues for their application in investigating various microscopic processes across fields like biomedicine.
Article Abstract
By narrowing the detection bandpass and increasing the signal-to-noise ratio in measuring the time-resolved fluorescence decay spectrum of colloidal CdSe-CdS/ZnS quantum dots (QDs), we show that directly after the photoexcitation, the fluorescence decay spectrum is characterized by a single exponential decay, which represents the energy relaxation of the photogenerated exciton from its initial high-energy state to the ground exciton state. The fluorescence decay spectrum of long decay time is in the form of β/t(2), where β is the radiative recombination time of the ground-state exciton and t is the decay time. Our findings provide us with a direct and quantitative link between fluorescence decay measurement data and fundamental photophysics of QD exciton, thereby leading to a novel way of applying colloidal QDs to study microscopic, physical and chemical processes in many fields including biomedicine.
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| http://dx.doi.org/10.1039/c5cp03109e | DOI Listing |
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