The effect of intensity of excitation on CdSe/ZnS quantum dots: opportunities in luminescence sensing

Jens U. Sutter; David J. S. Birch; Olaf J. Rolinski

doi:10.1063/1.3534784

The effect of intensity of excitation on CdSe/ZnS quantum dots: opportunities in luminescence sensing

Jens U. Sutter, David J. S. Birch, Olaf J. Rolinski

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We report changes in the photophysical properties of core-shell type CdSe/ZnS quantum dots (QDs) under optical irradiation. QDs either in aqueous solution or immobilized in a silica sol gel matrix have been excited at different wavelengths and fluxes. Illumination of the sample with 140 fs 700 nm Ti:sapphire laser pulses of the peak power of the order of 4 GW/cm(2) caused gradual increase in the luminescence lifetime from an initial value of 3.5 increasing to 4.5 ns and an increase in luminescence intensity by similar to 8%. Using about 16 GW/cm(2) peak power resulted in a shortening of the luminescence lifetime to 3 ns and a decrease in intensity by similar to 75%. Both photobrightening and photodarkening were fully reversible. We discuss the kinetics of photobrightening and photodarkening and investigate the suitability of QDs as luminescence lifetime sensors with tunable parameters.

Original language	English
Article number	021108
Number of pages	3
Journal	Applied Physics Letters
Volume	98
Issue number	2
DOIs	https://doi.org/10.1063/1.3534784
Publication status	Published - 11 Jan 2011

Keywords

live cells
in-vivo
nanoparticles
anisotropy

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10.1063/1.3534784

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abstract = "We report changes in the photophysical properties of core-shell type CdSe/ZnS quantum dots (QDs) under optical irradiation. QDs either in aqueous solution or immobilized in a silica sol gel matrix have been excited at different wavelengths and fluxes. Illumination of the sample with 140 fs 700 nm Ti:sapphire laser pulses of the peak power of the order of 4 GW/cm(2) caused gradual increase in the luminescence lifetime from an initial value of 3.5 increasing to 4.5 ns and an increase in luminescence intensity by similar to 8%. Using about 16 GW/cm(2) peak power resulted in a shortening of the luminescence lifetime to 3 ns and a decrease in intensity by similar to 75%. Both photobrightening and photodarkening were fully reversible. We discuss the kinetics of photobrightening and photodarkening and investigate the suitability of QDs as luminescence lifetime sensors with tunable parameters.",

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T2 - opportunities in luminescence sensing

AU - Sutter, Jens U.

AU - Birch, David J. S.

AU - Rolinski, Olaf J.

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AB - We report changes in the photophysical properties of core-shell type CdSe/ZnS quantum dots (QDs) under optical irradiation. QDs either in aqueous solution or immobilized in a silica sol gel matrix have been excited at different wavelengths and fluxes. Illumination of the sample with 140 fs 700 nm Ti:sapphire laser pulses of the peak power of the order of 4 GW/cm(2) caused gradual increase in the luminescence lifetime from an initial value of 3.5 increasing to 4.5 ns and an increase in luminescence intensity by similar to 8%. Using about 16 GW/cm(2) peak power resulted in a shortening of the luminescence lifetime to 3 ns and a decrease in intensity by similar to 75%. Both photobrightening and photodarkening were fully reversible. We discuss the kinetics of photobrightening and photodarkening and investigate the suitability of QDs as luminescence lifetime sensors with tunable parameters.

KW - live cells

KW - in-vivo

KW - nanoparticles

KW - anisotropy

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JO - Applied Physics Letters

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The effect of intensity of excitation on CdSe/ZnS quantum dots: opportunities in luminescence sensing

Abstract

Keywords

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NMS: EPSRC Science and Innovation Nanometrology for Molecular Science, Medicine and Manufacture

Yocto: YOCTOMOLE FLUORESCENCE SENSING OF SINGLE METAL IONS

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The effect of intensity of excitation on CdSe/ZnS quantum dots: opportunities in luminescence sensing

Abstract

Keywords

Access to Document

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Projects

NMS: EPSRC Science and Innovation Nanometrology for Molecular Science, Medicine and Manufacture

Yocto: YOCTOMOLE FLUORESCENCE SENSING OF SINGLE METAL IONS

Cite this