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Toward Efficient and Metal-Free Emissive Devices: A Solution Processed Host Guest Light-Emitting Electrochemical Cell Featuring Thermally Activated Delayed Fluorescence
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 34, p. 28810-28816Article in journal (Refereed) Published
Abstract [en]

The next generation of emissive devices should preferably be efficient, low-cost, and environmentally sustainable, and as such utilize all electrically generated excitons (both singlets and triplets) for the light emission, while being free from rare metals such as iridium. Here, we report on a step toward this vision through the design, fabrication, and operation of a host guest light-emitting electrochemical cell (LEC) featuring an organic thermally activated delayed fluorescence (TADF) guest that harvests both singlet and triplet excitons for the emission. The rare-metal-free active material also consists of a polymeric electrolyte and a polymeric compatibilizer for the facilitation of a cost-efficient and scalable solution-based fabrication, and for the use of air-stable electrodes. We report that such TADF-LEC devices can deliver uniform green light emission with a maximum luminance of 228 cd m(-2) when driven by a constant-current density of 770 A m(-2), and 760 cd m(-2) during a voltage ramp, which represents a one-order-of-magnitude improvement in comparison to previous TADF-emitting LECs.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 34, p. 28810-28816
Keywords [en]
light-emitting electrochemical cell, thermally activated delayed fluorescence, low-cost solution ocessing. efficient and metal-free emitter, sustainable illumination technology, XTER DL, 1953, JOURNAL OF CHEMICAL PHYSICS, V21, P836 erster Theodor, 2012, JOURNAL OF BIOMEDICAL OPTICS, V17, leur B., 2013, Molecular Fluorescence, iend RH, 1999, NATURE, V397, P121 tyba Piotr, 2011, ACS NANO, V5, P574 ng Zhehan, 2015, ECONOMIC GEOLOGY, V110, P1925
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-140478DOI: 10.1021/acsami.7b07826ISI: 000409395500075PubMedID: 28762717OAI: oai:DiVA.org:umu-140478DiVA, id: diva2:1151416
Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2018-06-09Bibliographically approved

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Lundberg, PetterLindh, MattiasTang, ShiEdman, Ludvig

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