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Arteaga Cardona, F.* ; Jain, N.* ; Popescu, R.* ; Busko, D.* ; Madirov, E.* ; Arus, B.A. ; Gerthsen, D.* ; De Backer, A.* ; Bals, S.* ; Bruns, O.T. ; Chmyrov, A. ; Van Aert, S.* ; Richards, B.S.* ; Hudry, D.*

Preventing cation intermixing enables 50% quantum yield in sub-15 nm short-wave infrared-emitting rare-earth based core-shell nanocrystals.

Nat. Commun. 14:4462 (2023)

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Short-wave infrared (SWIR) fluorescence could become the new gold standard in optical imaging for biomedical applications due to important advantages such as lack of autofluorescence, weak photon absorption by blood and tissues, and reduced photon scattering coefficient. Therefore, contrary to the visible and NIR regions, tissues become translucent in the SWIR region. Nevertheless, the lack of bright and biocompatible probes is a key challenge that must be overcome to unlock the full potential of SWIR fluorescence. Although rare-earth-based core-shell nanocrystals appeared as promising SWIR probes, they suffer from limited photoluminescence quantum yield (PLQY). The lack of control over the atomic scale organization of such complex materials is one of the main barriers limiting their optical performance. Here, the growth of either homogeneous (α-NaYF₄) or heterogeneous (CaF₂) shell domains on optically-active α-NaYF₄:Yb:Er (with and without Ce³⁺ co-doping) core nanocrystals is reported. The atomic scale organization can be controlled by preventing cation intermixing only in heterogeneous core-shell nanocrystals with a dramatic impact on the PLQY. The latter reached 50% at 60 mW/cm²; one of the highest reported PLQY values for sub-15 nm nanocrystals. The most efficient nanocrystals were utilized for in vivo imaging above 1450 nm.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Luminescence Enhancement; Nanoparticles; Emission; Photoluminescence; Nanoprobes

ISSN (print) / ISBN 2041-1723

e-ISSN 2041-1723

Journal Nature Communications

Quellenangaben Volume: 14, Issue: 1, Article Number: 4462

Publisher Nature Publishing Group

Publishing Place London

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Helmholtz Pioneer Campus (HPC)

Grants Helmholtz Imaging
CZI Deep Tissue Imaging
DFG-Emmy Noether program
Helmholtz Zentrum Muenchen
Research Foundation Flanders (FWO, Belgium)
European Research Council
European Union
Helmholtz Association