Low-Threshold, Highly Stable Colloidal Quantum Dot Short-Wave Infrared Laser enabled by Suppression of Trap-Assisted Auger Recombination.

Autor: Taghipour N; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Whitworth GL; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Othonos A; Laboratory of Ultrafast Science, Department of Physics, University of Cyprus, Nicosia, 1678, Cyprus., Dalmases M; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Pradhan S; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Wang Y; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Kumar G; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain., Konstantatos G; ICFO, Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860, Spain.; ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, 08010, Spain.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Jan; Vol. 34 (3), pp. e2107532. Date of Electronic Publication: 2021 Nov 18.
DOI: 10.1002/adma.202107532
Abstrakt: Pb-chalcogenide colloidal quantum dots (CQDs) are attractive materials to be used as tuneable laser media across the infrared spectrum. However, excessive nonradiative Auger recombination due to the presence of trap states outcompetes light amplification by rapidly annihilating the exciton population, leading to high gain thresholds. Here, a binary blend is employed of CQDs and ZnO nanocrystals in order to passivate the in-gap trap states of PbS-CQD gain medium. Using transient absorption, a fivefold increase is measured in Auger lifetime demonstrating the suppression of trap-assisted Auger recombination. By doing so, a twofold reduction is achieved in amplified spontaneous emission (ASE) threshold. Finally, by integrating the proposed binary blend to a distributed feedback (DFB) resonator, single-mode lasing emission is demonstrated at 1650 nm with a linewidth of 1.23 nm (0.62 meV), operating at a low lasing threshold of ≈385 μJ cm -2 . The Auger suppression in this system has allowed to achieve unprecedented lasing emission stability for a CQD laser with recorded continuous operation of 5 h at room temperature and ambient conditions.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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