Narrow and Highly Polarized Photoluminescence of Colloidal 2D PbS Nanoplatelets at 680 nm

Pengji Li^a, Lars F. Klepzig^b^,^c, Jingzhong Yang^a, Fei Ding^a, Michael Zopf^a, Jannika Lauth^b^,^c^,^d

^aLeibniz University Hanover, Institute of Solid State Physics, 30167 Hanover, Germany

^bLeibniz University Hanover, Institute of Physical Chemistry and Electrochemistry, 30167 Hanover, Germany.

^cCluster of Excellence PhoenixD (Photonics, Optics, and Engineering – Innovation Across Disciplines), 30167 Hanover, Germany.

^dInstitute of Physical and Theoretical Chemistry, Universität Tübingen, Geschwister-Scholl-Platz, Tübingen, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)

#QMat - Materials for Quantum Technology

VALÈNCIA, Spain, 2023 March 6th - 10th

Organizers: José J. Baldoví, Dmitry Baranov and Jannika Lauth

Oral, Lars F. Klepzig, presentation 250
DOI: https://doi.org/10.29363/nanoge.matsus.2023.250
Publication date: 22nd December 2022

Photonic quantum technologies like quantum key distribution for safe data exchange use single photons as information carrier, provided by a single photon source. Among others, semiconductor nanomaterials have shown their capability in single photon emission.[1]

Ultrathin colloidal two-dimensional (2D) semiconductors, so-called nanoplatelets, represent a highly topical material class with optical properties including very narrow absorption and emission.[2] They exhibit strong excitonic effects caused by a few-atom layer thickness of the structures.

Lead chalcogenide-based colloidal 2D nanoplatelets are of special interest, since their band gap can be tailored over a broad near-infrared spectral range.[3,4] For example, colloidal chemistry methods yield 2D PbS nanoplatelets with an optical absorption onset at 680 nm, a thickness of only 1-2 nm and a lateral dimension of ~10 nm². Photoluminescence quantum yields of 20 % at 720 nm are obtained. However, at room temperature, exciton-phonon coupling contributes to photoluminescence linewidth broadening in the structures.[5]

Here, we show single PbS nanoplatelet photoluminescence measurements at cryogenic temperatures, revealing an extremely narrow full-width at half maximum of 0.6 meV. Due to the 2D shape of the nanoplatelet, a polarization anisotropy unknown from spherical quantum dots is observed. We will discuss the prospects of PbS nanoplatelets as interesting colloidal candidates for single photon emission.

References:

[1] Cao, X.; Zopf, M.; Ding, F. Telecom Wavelength Single Photon Sources. J. Semicond. 2019, 40, 071901

[2] Ithurria, S.; Dubertret, B. Quasi 2D Colloidal CdSe Platelets with Thicknesses Controlled at the Atomic Level. J. Am. Chem. Soc. 2008, 130, 49, 16504-16505

[3] Klepzig, L.; Biesterfeld, L.; Romain, M.; Niebur, A.; Schlosser, A.; Hübner, J.; Lauth, J. Colloidal 2D PbSe Nanoplatelets with Efficient Emission Reaching the Telecom O-, E- and S-band. Nanoscale Adv. 2022, 4, 590-599

[4] Biesterfeld, L.; Klepzig, L.; Niebur, A.; Rosebrock, M.; Lauth, J. Toward Bright Colloidal Near-Infrared Emitters: Surface Passivation of 2D PbSe Nanoplatelets by Metal Halides. J. Phys. Chem. C 2022, 126, 45, 19277-19285

[5] Manteiga Vázquez, F.; Yu, Q.; Klepzig, L.; Siebbeles, L.; Crisp, R.; Lauth, J. Probing Excitons in Ultrathin PbS Nanoplatelets with Enhanced Near-Infrared Emission J. Phys. Chem. Lett. 2021, 12, 1, 680-685

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