In-Depth Analysis of Excitation Dynamics in Dye-Sensitized Upconversion Core and Core/Active Shell Nanoparticles

Sergey Alyatkin, Elena Urena-Horno, Bigeng Chen, Otto L. Muskens, Antonios G. Kanaras, Pavlos G. Lagoudakis

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)18177-18184
    Number of pages8
    JournalJournal of Physical Chemistry C
    Volume122
    Issue number31
    DOIs
    Publication statusPublished - 9 Aug 2018

    Fingerprint

    Dive into the research topics of 'In-Depth Analysis of Excitation Dynamics in Dye-Sensitized Upconversion Core and Core/Active Shell Nanoparticles'. Together they form a unique fingerprint.

    Cite this