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In-depth analysis of excitation dynamics in dye-sensitized upconversion core and core/active shell nanoparticles

In-depth analysis of excitation dynamics in dye-sensitized upconversion core and core/active shell nanoparticles
In-depth analysis of excitation dynamics in dye-sensitized upconversion core and core/active shell nanoparticles
Upconversion nanoparticles (UCNPs) combining both dye sensitization and core/shell enhancement are of great interest for their ability to boost the excitation efficiency of upconversion systems. Here, we report and investigate a 20-fold upconversion luminescence enhancement in dye-sensitized core/active shell UCNPs compared to that in nonsensitized core-only UCNPs. We observe a two-component luminescence rise dynamics in the upconversion kinetics of dye-sensitized UCNPs, distinctly different from the one-component rise dynamics of the nonsensitized UCNPs. For dye-sensitized UCNPs, the fast sub-microsecond component of the upconversion luminescence rise time is attributed to the radiative pumping of Er3+ ions from the dye, whereas the slow sub-millisecond component is due to the nonradiative energy transfer from the dye predominantly to Yb3+ ions, followed by the energy migration and the nonradiative energy transfer from Yb3+ to Er3+ ions. Our studies provide an insight into the interplay between radiative and nonradiative energy transfer as well as into the role of energy migration across the active shell of dye-sensitized core/active shell UCNPs.
1932-7447
Alyatkin, Sergey
0d49f248-ddc6-48f5-8d2f-a7bf018a100f
Urena Horno, Elena
25a09893-6a2e-4930-99bb-1812ee7d0a03
Chen, Bigeng
e533448b-095e-4a9f-924c-301f4aa3007b
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Kanaras, Antonios G.
667ecfdc-7647-4bd8-be03-a47bf32504c7
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Alyatkin, Sergey
0d49f248-ddc6-48f5-8d2f-a7bf018a100f
Urena Horno, Elena
25a09893-6a2e-4930-99bb-1812ee7d0a03
Chen, Bigeng
e533448b-095e-4a9f-924c-301f4aa3007b
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Kanaras, Antonios G.
667ecfdc-7647-4bd8-be03-a47bf32504c7
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Alyatkin, Sergey, Urena Horno, Elena, Chen, Bigeng, Muskens, Otto L., Kanaras, Antonios G. and Lagoudakis, Pavlos G. (2018) In-depth analysis of excitation dynamics in dye-sensitized upconversion core and core/active shell nanoparticles. The Journal of Physical Chemistry C. (doi:10.1021/acs.jpcc.8b05992).

Record type: Article

Abstract

Upconversion nanoparticles (UCNPs) combining both dye sensitization and core/shell enhancement are of great interest for their ability to boost the excitation efficiency of upconversion systems. Here, we report and investigate a 20-fold upconversion luminescence enhancement in dye-sensitized core/active shell UCNPs compared to that in nonsensitized core-only UCNPs. We observe a two-component luminescence rise dynamics in the upconversion kinetics of dye-sensitized UCNPs, distinctly different from the one-component rise dynamics of the nonsensitized UCNPs. For dye-sensitized UCNPs, the fast sub-microsecond component of the upconversion luminescence rise time is attributed to the radiative pumping of Er3+ ions from the dye, whereas the slow sub-millisecond component is due to the nonradiative energy transfer from the dye predominantly to Yb3+ ions, followed by the energy migration and the nonradiative energy transfer from Yb3+ to Er3+ ions. Our studies provide an insight into the interplay between radiative and nonradiative energy transfer as well as into the role of energy migration across the active shell of dye-sensitized core/active shell UCNPs.

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Accepted/In Press date: 16 July 2018
e-pub ahead of print date: 16 July 2018

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Local EPrints ID: 422959
URI: https://eprints.soton.ac.uk/id/eprint/422959
ISSN: 1932-7447
PURE UUID: 16e7c409-1bb1-402e-a6b7-e778ee6a2f41
ORCID for Bigeng Chen: ORCID iD orcid.org/0000-0003-4925-2308
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504
ORCID for Antonios G. Kanaras: ORCID iD orcid.org/0000-0002-9847-6706

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Date deposited: 08 Aug 2018 16:30
Last modified: 14 Mar 2019 01:39

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Contributors

Author: Sergey Alyatkin
Author: Elena Urena Horno
Author: Bigeng Chen ORCID iD
Author: Otto L. Muskens ORCID iD

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