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Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy

descriptionPublicationkeyboard_double_arrow_right Article 14 Aug 2001 Netherlands English Publisher:American Chemical Society (ACS)Journal:The Journal of Physical Chemistry B, volume 105, pages 8,281-8,284 (issn: 1520-6106, eissn: 1520-5207,

Authors: and Celso de Mello Donegá; Wilfried van Sark; Hans C. Gerritsen; Joost N. J. van Lingen; Ageeth A. Bol; P. L. T. M. Frederix; and Dave J. Van den Heuvel; +1 Authors

doi: 10.1021/jp012018h

Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy

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Abstract

The room-temperature luminescence of single CdSe/ZnS core−shell quantum dots is investigated by spectrally and temporally resolved confocal microscopy. A large (30 nm) blue shift is observed in the emission wavelength during illumination in air. In nitrogen, no blue shift is observed. The blue shift in air is ascribed to a 1 nm shrinkage of the CdSe core by photooxidation. Photobleaching occurs about 4 times faster in air than in nitrogen, indicating the formation of nonradiative recombination centers during photooxidation. The initial light output is higher in air than in nitrogen, which may be due to a reduction of the defect state lifetime by oxygen.

Country

Netherlands

Related Organizations

Utrecht University
Netherlands

Keywords

Econometric and Statistical Methods: General, Other medical specialities, Taverne, Geneeskunde(GENK), Algemeen onderzoek

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