期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 2, 页码 582-586出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811703
关键词
dual fluorescence emission; materials science; organic light-emitting diodes (OLEDs); photochemistry; thermally activated delayed fluorescence
资金
- National Key R&D Program of China [2016YFB0401004]
- National Natural Science Foundation of China [51625301, U1601651, 51573059, 91233116]
- 973 Project [2015CB655003]
- Guangdong Provincial Department of Science and Technology [2016B090906003, 2016TX03C175]
- China Postdoctoral Science Foundation [2017M622680]
To date, blue dual fluorescence emission (DFE) has not been realized because of the limited choice of chemical moieties and severe geometric deformation of the DFE emitters leading to strong intramolecular charge transfer (ICT) with a large Stokes shift in excited states. Herein, an emitter (1 ' r,5 ' R,7 ' S)-10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-10H-spiro [acridine-9,2 '-adamantane] (a-DMAc-TRZ) containing a novel adamantane-substituted acridine donor is reported, which exhibits unusual blue DFE. The introduction of the rigid and bulky adamantane moiety not only suppressed the geometry relaxation in excited state, but also induced the formation of quasi-axial conformer (QAC) and quasi-equatorial conformer (QEC) geometries, leading to deep-blue conventional fluorescence and sky-blue thermally activated delayed fluorescence (TADF). The resulting organic light-emitting diodes (OLEDs) achieved a maximum external quantum efficiency (EQE) of about 29 %, which is the highest reported for OLEDs based on dual-conformation emitters.
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