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Efficient and brigh...
Efficient and bright blue thermally activated delayed fluorescence from light-emitting electrochemical cells
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- Tang, Shi (författare)
- Umeå universitet,Institutionen för fysik,LunaLEC AB, Umeå, Sweden
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- Lundberg, Petter (författare)
- Umeå universitet,Institutionen för fysik
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- Tsuchiya, Youichi (författare)
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Motooka, Nishi-ku, Fukuoka, Japan
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- Ràfols-Ribé, Joan (författare)
- Umeå universitet,Institutionen för fysik,LunaLEC AB, Umeå, Sweden
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- Liu, Yong-feng (författare)
- Umeå universitet,Institutionen för fysik,College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou, China
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- Wang, Jia (författare)
- Umeå universitet,Institutionen för fysik
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- Adachi, Chihaya (författare)
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Motooka, Nishi-ku, Fukuoka, Japan
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- Edman, Ludvig, 1967- (författare)
- Umeå universitet,Institutionen för fysik,LunaLEC AB, Umeå, Sweden
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(creator_code:org_t)
- 2022-08-10
- 2022
- Engelska.
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Ingår i: Advanced Functional Materials. - : John Wiley & Sons. - 1616-301X .- 1616-3028. ; :44
- Relaterad länk:
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https://doi.org/10.1...
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https://umu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Light-emitting electrochemical cells (LECs) comprising metal-free molecules that emit by the process of thermally activated delayed fluorescence (TADF) can be both sustainable and low cost. However, the blue emission performance of current TADF-LECs is unfortunately poor, which effectively prohibits their utilization in important applications, such as illumination and full-color displays. Here, this drawback is addressed through the development of a TADF-LEC, which delivers blue light emission (peak wavelength = 475 nm) with a high external quantum efficiency of 5.0%, corresponding to a current efficacy of 9.6 cd A-1. It is notable that this high efficiency is attained at bright luminance of 740 cd m-2, and that the device turn-on is very fast. It is demonstrated that this accomplishment is enabled by the blending of a carbazole-based 9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2-methylphenyl)-3,6-dimethyl-9H-carbazole guest emitter with a compatible carbazole-based tris(4-carbazoyl-9-ylphenyl)amine:2,6-bis(3-(carbazol-9-yl)phenyl)pyridine blend-host for the attainment of bipolar electrochemical doping, balanced electron/hole transport, and exciplex-effectuated host-to-guest energy transfer.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- blend host
- blue emission
- high efficiency
- light-emitting electrochemical cells
- thermally activated delayed fluorescence
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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