Journal
NANOPHOTONICS
Volume 10, Issue 9, Pages 2407-2420Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0077
Keywords
electric field; quantum dot/rod; semiconductor nanoparticle; two-photon fluorescence; voltage sensing
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Funding
- Flanders Research Foundation (FWO) [1SC3819N]
- Flanders Research Foundation (FWO grant) [G0947.17N]
- KU Leuven [OT/14/084, C14/18/061]
- Hercules Foundation [AKUL/11/15]
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The research demonstrates that the electric field sensitivity of fluorescence intensity of type-I and quasi-type-II quantum dots and quantum rods is enhanced under two-photon excitation, allowing them to track fast switching E-fields. This suggests the potential of semiconductor nanoparticles as cellular voltage probes in multiphoton imaging.
The optoelectronic properties of semiconductor nanoparticles make them valuable candidates for the long-term monitoring of transmembrane electric fields in excitable cells. In this work, we show that the electric field sensitivity of the fluorescence intensity of type-I and quasi-type-II quantum dots and quantum rods is enhanced under two-photon excitation compared to single-photon excitation. Based on the superior electric field sensitivity of the two-photon excited fluorescence, we demonstrate the ability of quantum dots and rods to track fast switching E-fields. These findings indicate the potential of semiconductor nanoparticles as cellular voltage probes in multiphoton imaging.
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