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Highly Soluble CsPbBr3 Perovskite Quantum Dots for Solution-Processed Light-Emission Devices
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3556-9593
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1274-5918
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-2243-5251
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-9239-0541
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2021 (English)In: ACS Applied Nano Materials, E-ISSN 2574-0970, p. 1162-1174Article in journal (Refereed) Published
Abstract [en]

We report on the synthesis of CsPbBr3 perovskite quantum dots (PeQDs) with a high solubility of 75 g/L in toluene and a good film-forming property, as enabled by a dense layer of didodecyldimethylammonium bromide and octanoic acid surface ligands. The crystalline and monodisperse PeQDs feature a cubic-like shape, with an edge length of 10.1 nm, and a high photoluminescence quantum yield of greater than 90% in toluene solution and 36% as a thin film. We find that the PeQDs are n-type doped following the synthesis but also that they can be p-type and additionally n-type doped by in situ electrochemistry. These combined properties render the PeQDs interesting for the emitter in solution-processed light-emitting electrochemical cells (LECs), and we report a PeQD-LEC with air-stabile electrodes that emits with a narrow emission spectrum (λpeak = 514 nm, full width at half-maximum = 24 nm) and a luminance of 250 cd/m2 at 4 V and a luminance of 1090 cd/m2 at 6.8 V. To reach this performance, it was critical to include a thin solution-processed layer comprising p-type poly(vinyl carbazole) and a tetrahexylammonium tetrafluoroborate ionic liquid between the PeQD emission layer and the anode in order to compensate for the as-synthesized n-type doping of the PeQDs.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021. p. 1162-1174
Keywords [en]
perovskite quantum dots, surface ligands, high solubility, good film forming capacity, light-emitting electrochemical cell, ion migration
National Category
Natural Sciences
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:umu:diva-179020DOI: 10.1021/acsanm.0c02797ISI: 000624546800025Scopus ID: 2-s2.0-85100019584OAI: oai:DiVA.org:umu-179020DiVA, id: diva2:1521400
Funder
Swedish Energy Agency, 45419-1Swedish Energy Agency, 46523-1Swedish Energy Agency, 50779-1The Kempe FoundationsSwedish Research Council, 2017-04380Swedish Research Council, 2017-04862Swedish Research Council, 2018-03937Swedish Research Council, 2019-02345Swedish Foundation for Strategic Research Stiftelsen Olle Engkvist Byggmästare, 186-0637Stiftelsen Olle Engkvist Byggmästare, 193-0578Available from: 2021-01-22 Created: 2021-01-22 Last updated: 2021-07-02Bibliographically approved

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Liu, Yong-fengTang, ShiFan, JunpengGracia-Espino, EduardoLarsen, ChristianWågberg, ThomasEdman, LudvigWang, Jia

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Liu, Yong-fengTang, ShiFan, JunpengGracia-Espino, EduardoLiu, XianjieKera, SatoshiFahlman, MatsLarsen, ChristianWågberg, ThomasEdman, LudvigWang, Jia
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