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Carbon nanodots: a metal-free, easy-to-synthesize, and benign emitter for light-emitting electrochemical cells
Umeå University, Faculty of Science and Technology, Department of Physics. College of Physical Science and Technology, Yangzhou University, Yangzhou, China.ORCID iD: 0000-0002-3556-9593
Umeå University, Faculty of Science and Technology, Department of Physics. LunaLEC AB, Umeå, Sweden.ORCID iD: 0000-0003-1274-5918
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3881-6764
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2022 (English)In: Nano Reseach, ISSN 1998-0124, E-ISSN 1998-0000, Vol. 15, no 6, p. 5610-5618Article in journal (Refereed) Published
Abstract [en]

Light-emitting electrochemical cells (LECs) can be fabricated with cost-efficient printing and coating methods, but a current drawback is that the LEC emitter is commonly either a rare-metal complex or an expensive-to-synthesize conjugated polymer. Here, we address this issue through the pioneering employment of metal-free and facile-to-synthesize carbon nanodots (CNDs) as the emitter in functional LEC devices. Circular-shaped (average diameter = 4.4 nm) and hydrophilic CNDs, which exhibit narrow cyan photoluminescence (peak = 485 nm, full width at half maximum = 30 nm) with a high quantum yield of 77% in dilute ethanol solution, were synthesized with a catalyst-free, one-step solvothermal process using low-cost and benign phloroglucinol as the sole starting material. The propensity of the planar CNDs to form emission-quenching aggregates in the solid state was inhibited by the inclusion of a compatible 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene host compound, and we demonstrate that such pristine host-guest CND-LECs turn on to a peak luminance of 118 cd·m−2 within 5 s during constant current-density driving at 77 mA·cm−2.

Place, publisher, year, edition, pages
Springer, 2022. Vol. 15, no 6, p. 5610-5618
Keywords [en]
carbon nanodot, light-emitting electrochemical cell, phloroglucinol, solution-based fabrication, sustainable synthesis
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Identifiers
URN: urn:nbn:se:umu:diva-193331DOI: 10.1007/s12274-022-4126-8ISI: 000769316800005Scopus ID: 2-s2.0-85126301644OAI: oai:DiVA.org:umu-193331DiVA, id: diva2:1647828
Funder
The Kempe Foundations, SMK-1849.1Swedish Energy Agency, 45419-1Swedish Energy Agency, 46523-1Swedish Energy Agency, 50779-1Swedish Research Council, 2017-04380Swedish Research Council, 2017-04862Swedish Research Council, 2018-03937Swedish Research Council, 2019-02345Swedish Foundation for Strategic ResearchOlle Engkvists stiftelse, 186-0637Olle Engkvists stiftelse, 193- 0578Bertil & Britt Svenssons Stiftelse för BelysningsteknikThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT), 2019-8553Available from: 2022-03-29 Created: 2022-03-29 Last updated: 2023-03-24Bibliographically approved

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Liu, Yong-fengTang, ShiWu, XiuyuBoulanger, NicolasGracia-Espino, EduardoWågberg, ThomasEdman, LudvigWang, Jia

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Liu, Yong-fengTang, ShiWu, XiuyuBoulanger, NicolasGracia-Espino, EduardoWågberg, ThomasEdman, LudvigWang, Jia
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