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Journal Article

Quantum Efficiency of Single Dibenzoterrylene Molecules in p-Dichlorobenzene at Cryogenic Temperatures

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Musavinezhad,  Mohammad
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Shkarin,  Alexey
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Rattenbacher,  Dominik
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Renger,  Jan
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Utikal,  Tobias
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Götzinger,  Stephan
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Friedrich-Alexander-Universität Erlangen-Nürnberg, External Organizations;

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Sandoghdar,  Vahid
Sandoghdar Division, Max Planck Institute for the Science of Light, Max Planck Society;
Sandoghdar Division, Max-Planck-Zentrum für Physik und Medizin, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Musavinezhad, M., Shkarin, A., Rattenbacher, D., Renger, J., Utikal, T., Götzinger, S., et al. (2023). Quantum Efficiency of Single Dibenzoterrylene Molecules in p-Dichlorobenzene at Cryogenic Temperatures. The Journal of Physical Chemistry B, 5353-5359. doi:10.1021/acs.jpcb.3c01755.


Cite as: https://hdl.handle.net/21.11116/0000-000C-D813-B
Abstract
We measure the quantum efficiency (QE) of individual dibenzoterrylene (DBT) molecules embedded in p-dichlorobenzene at cryogenic temperatures. To achieve this, we combine two distinct methods based on the maximal photon emission and on the power required to saturate the zero-phonon line to compensate for uncertainties in some key system parameters. We find that the outcomes of the two approaches are in good agreement for reasonable values of the parameters involved, reporting a large fraction of molecules with QE values above 50%, with some exceeding 70%. Furthermore, we observe no correlation between the observed lower bound on the QE and the lifetime of the molecule, suggesting that most of the molecules have a QE exceeding the established lower bound. This confirms the suitability of DBT for quantum optics experiments. In light of previous reports of low QE values at ambient conditions, our results hint at the possibility of a strong temperature dependence of the QE.