Volume 137, Issue 9 e202420658
Forschungsartikel

Efficient Energy Transfer from Quantum Dots to Closely-Bound Dye Molecules without Spectral Overlap

Mariam Kurashvili

Mariam Kurashvili

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Conceptualization (supporting), Data curation (lead), Formal analysis (lead), ​Investigation (lead), Methodology (lead), Writing - original draft (lead)

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Jordi Llusar

Jordi Llusar

BCMaterials, Basque Center for Materials, Applications, and Nanostructures, UPV/EHU Science Park, Leioa, 48940 Spain

Contribution: Data curation (supporting)

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Lena S. Stickel

Lena S. Stickel

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Data curation (supporting)

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Tim Würthner

Tim Würthner

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Data curation (supporting)

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David Ederle

David Ederle

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Formal analysis (supporting)

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Ivan Infante

Corresponding Author

Ivan Infante

BCMaterials, Basque Center for Materials, Applications, and Nanostructures, UPV/EHU Science Park, Leioa, 48940 Spain

Ikerbasque Basque Foundation for Science, Bilbao, 48009, Spain

Contribution: Funding acquisition (supporting), Supervision (supporting), Writing - review & editing (supporting)

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Jochen Feldmann

Corresponding Author

Jochen Feldmann

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Funding acquisition (lead), Supervision (equal), Writing - review & editing (equal)

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Quinten A. Akkerman

Corresponding Author

Quinten A. Akkerman

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstraße 10, 80539 Munich, Germany

Contribution: Conceptualization (equal), Supervision (lead), Writing - original draft (supporting), Writing - review & editing (equal)

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First published: 29 October 2024

Abstract

Quantum dots (QDs) are semiconductor nanocrystals whose optical properties can be tuned by altering their size. By combining QDs with dyes we can make hybrid QD-dye systems exhibiting energy transfer (ET) between QDs and dyes, which is important in sensing and lighting applications. In conventional QDs that need a shell to passivate surface defects, ET usually proceeds through Förster resonance energy transfer (FRET) that requires significant spectral overlap between QD emission and dye absorbance, as well as large oscillator strengths of those transitions. This considerably limits the choice of dyes. In contrast, perovskite QDs do not require passivating shells for bright emission, which makes ET mechanisms beyond FRET accessible. This work explores the design of a CsPbBr3 QD-dye system to achieve efficient ET from CsPbBr3 QDs to dyes with dimethyl iminium binding groups where the close binding of dyes to CsPbBr3 surface facilitates spatial wavefunction overlap. Using steady-state and time-resolved photoluminescence experiments, we demonstrate that efficient ET from CsPbBr3 to dyes with minimal spectral overlap proceeds via the Dexter exchange-type mechanism, which overcomes the conventional restriction of spectral overlap that severely limits the tunability of these systems. This approach opens new avenues for QD-molecule hybrids for a wide range of applications, such as lighting.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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