Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201901150
Keywords
blue-shifted emission; deformed structure; donor-sigma-acceptor; thermally activated delayed fluorescence; through space charge transfer
Categories
Funding
- National Key R&D Program of China [2016YFB0400700]
- National Natural Science Foundation of China [51773141, 51873139, 21572152]
- Natural Science Foundation of Jiangsu Province of China [BK20181442]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_2491]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- China Scholarship Council [201806920067]
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Through-space charge transfer, which exists in nonconjugation linker based thermally activated delayed fluorescence (TADF) materials, excites chemists to explore more possibilities in organic light-emitting diodes (OLEDs). Herein, an sp(3)-hybrid carbon-centered donor-sigma-acceptor type chromophore, QAFCN, is tentatively developed by exploring bi-acridine based electron-donor, i.e., 5,5-dimethyl-5,9-dihydroquinolino[3,2,1-de]acridine (QA). It is interesting to find that the QA moiety shows downshift in highest occupied molecular orbital because of its deformed geometry, which makes it qualified for sky-blue electroluminescence emission. Together with the blue-shift, enhanced photoluminescence quantum yield and faster reverse intersystem crossing rate are also observed in QAFCN, which can be attributed to the close through-space distance between donor/acceptor. As compared to the ACRFLCN without these special features, QAFCN has obvious TADF property and achieves efficient OLEDs of approximate to 18% external quantum efficiency.
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