Enhanced spin lifetime in colloidal quantum dots by growth from singly Mn-doped molecular cluster seeds.
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Abstract
Doped colloidal quantum dots (CQDs) are promising spin-photon interfaces, combining excellent optical properties and a substrate-free, nano-positionable platform. Here, we report the synthesis of InP/ZnSeS core-shell CQDs from zinc sulphide based seed clusters containing single Mn(II) ions. The resulting doped CQDs demonstrate photoluminescence quantum yields of up to 70%, a spin-lattice lifetime of 22 ms and a spin coherence lifetime of 2.7 μs, greater than and similar to the best yet reported for Mn-doped CQD systems, respectively. These spin lifetimes were achieved despite the high nuclear spin of InP, demonstrating the effectiveness of the ZnS cluster in shielding the Mn ion from its environment.
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Acknowledgements: This work was supported by Innovate UK grant number 10030660 and Nanoco Technologies Limited. TEM, EDS and EELS measurements were supported by the Cambridge Royce facilities under EPSRC grant EP/P024947/1 and the Sir Henry Royce Institute under recurrent EPSRC grant EP/R00661X/1. We acknowledge the UK National EPR Facility at the University of Manchester for supporting this work (EPSRC grants EP/W014521/1 and EP/V035231/1 and EP/X034523/1). PP was also supported by UKRI grant MR/T021519/1. We acknowledge the use of the Thermo Fisher Spectra 300 TEM funded by EPSRC under grant EP/R008779/1.
Publication status: Published
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2040-3372
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Engineering and Physical Sciences Research Council (EP/P024947/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)