期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 7, 页码 7192-7198出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19428
关键词
a donor-sigma-acceptor motif; intramolecular charge transfer; intramolecular charge transfer; a sensitizing host; thermally activated delayed fluorescence
资金
- JSPS KAKENHI [17H01231, 17J09631]
- National Key Research and Development Program of China [2017YFA0204501]
- National Science Fund of China [51525304, 61890942, U1601651]
- Grants-in-Aid for Scientific Research [17J09631] Funding Source: KAKEN
A novel thermally activated delayed fluorescent (TADF) compound, 9-(3-((4,6-diphenyl-1,3,5-triazin-2-yl)oxy)phenyl)-3,6-diphenyl-9H-carbazole (PhCz-o-Trz), with a donor-sigma-acceptor (D-sigma-A) motif is developed. A flexible small space sigma-junction is adopted to partly suppress the intramolecular charge transfer (intra-CT) while inversely enhancing the intermolecular charge transfer (inter-CT) between D/A moieties, realizing the coexistence of both intra-CT and inter-CT in an amorphous aggregate. The coexistence of dual CTs increases the complexity of the singlet and triplet state mixing, enhancing the triplet-to-singlet spin-flip transition and thereby the TADF emission. Additionally, PhCz-o-Trz is evaluated not only as an emitter but also as a sensitizing host for fluorescent and phosphorescent dopants, all exhibiting high efficiencies with alleviated efficiency roll-offs. These results shed light on the development of new TADF materials with dual CTs and may further deepen our understanding about TADF mechanisms.
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