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Photodynamics of a Single Quantum Dot: Fluorescence Activation, Enhancement, Intermittency, and Decay

journal contribution
posted on 2023-06-08, 09:24 authored by Steven F Lee, Mark Osborne
The observation of photoluminescence (PL) activation, enhancement, fluorescence intermittency (FI), and decay over the photochemical lifetimes of single quantum dots (QD) is reported. The ability to count individual QDs along with PL intensities has revealed a measurable nonlinear correlation between the total fluorescence and QD population that is the result of enhancement and decay in the quantum yield (QY) of individual dots. This allows the differentiation between ensemble PL enhancement due to the fluorescence activation of a dark, non-emitting fraction of QDs and that due to genuine QY modification in individual nanocrystals. The evolution of the bright, fluorescent population under continuous illumination is seen to closely follow that of the intermediate in a consecutive elementary reactions scheme. Spectral separation of QD fluorescence trajectories into red and blue components indicates that PL decay is not necessarily associated with blue-shifting of the emission wavelength.

History

Publication status

  • Published

Journal

Journal of the American Chemical Society

ISSN

0002-7863

Publisher

ACS Publishing

Issue

29

Volume

129

Page range

8936-8937

Pages

12.0

Department affiliated with

  • Chemistry Publications

Notes

First report of photoluminescence enhancement in inividual semiconductor nanocrystals and the differentiation between the apparent enhancement of the ensemble due to a photo-induced activation of a non-fluorescent dark fraction and genuine quantum yield enhancement at the single quantum dot level.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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