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Ideal blue thermally activated delayed fluorescent emission assisted by a thermally activated delayed fluorescent assistant dopant through a fast reverse intersystem crossing mediated cascade energy transfer process

Abstract

A novel blue thermally activated delayed fluorescent (TADF) organic light-emitting diode with an emitting layer made up of a TADF assistant dopant and a pure blue-emitting TADF emitter was developed to demonstrate pure blue color, high external quantum efficiency, suppressed efficiency roll-off, and improved lifetime. Two fused B-N type blue TADF emitters with a narrow emission spectrum were used as the blue emitters and the narrow blue emission was harvested by a TADF assistant dopant through a reverse intersystem crossing mediated cascade energy transfer process. A high external quantum efficiency of 31.4%, pure blue emission color of (0.13, 0.15), significant reduction of the efficiency roll-off and more than 10 times lifetime extension were simultaneously achieved using the TADF assisted TADF process.

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Publication details

The article was received on 27 Dec 2018, accepted on 11 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C8TC06575F
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Ideal blue thermally activated delayed fluorescent emission assisted by a thermally activated delayed fluorescent assistant dopant through a fast reverse intersystem crossing mediated cascade energy transfer process

    S. H. Han, J. H. Jeong, J. W. Yoo and J. Y. Lee, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C8TC06575F

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