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| Title: | Photoinduced fluorescence intensity oscillation in a reaction-diffusion cell containing a colloidal quantum dot dispersion |
| Authors: | Komoto, Atsushi
Maenosono, Shinya |
| Issue Date: | 2006-09-19 |
| Publisher: | American Institute of Physics |
| Magazine name: | Journal of Chemical Physics |
| Volume: | 125 |
| Number: | 11 |
| Start page: | 114705-1 |
| End page: | 114705-11 |
| DOI: | 10.1063/1.2338804 |
| Abstract: | The nonlinear spontaneous oscillation of photoluminescence (PL) intensity in an ensemble of semiconductor quantum dots (QDs), which differs from the fluorescence intermittency of a single QD, is investigated. The PL intensity in a QD dispersion slowly oscillates with time under continuous illumination. The oscillatory behavior is found to vary with changing QD concentration, solvent viscosity, volume fraction of irradiated region, and irradiation intensity. On the basis of the Gray-Scott model [Chemical Oscillation and Instabilities: Non-linear Chemical Kinetics (Clarendon, Oxford, 1994); J. Phys. Chem. 89, 22 (1985); Chem. Eng. Sci. 42, 307 (1987)], and its comparison with the experimental results, it is revealed that the following processes are important for PL oscillation: (1) mass transfer of QDs between the illuminated and dark regions, (2) autocatalytic formation of vacant sites on QD surfaces via photodesorption of ligand molecules, and (3) passivation of vacant sites via photoadsorption of water molecules. |
| Rights: | Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Atsushi Komoto and Shinya Maenosono, Journal of Chemical Physics, 125(11), 114705 (2006) and may be found at http://link.aip.org/link/?JCPSA6/125/114705/1 |
| URI: | https://hdl.handle.net/10119/4525 |
| Material Type: | publisher |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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