TY - JOUR
T1 - Through Space Charge Transfer for Efficient Sky-Blue Thermally Activated Delayed Fluorescence (TADF) Emitter with Unconjugated Connection
AU - Wang, Ya Kun
AU - Huang, Chen Chao
AU - Ye, Hao
AU - Zhong, Cheng
AU - Khan, Aziz
AU - Yang, Sheng Yi
AU - Fung, Man Keung
AU - Jiang, Zuo Quan
AU - Adachi, Chihaya
AU - Liao, Liang Sheng
N1 - Funding Information:
The authors acknowledge financial support from the National Key R&D Program of China (No. 2016YFB0400700), the National Natural Science Foundation of China (Nos. 51773141, 51873139, and 21572152) and the Natural Science Foundation of Jiangsu Province of China (BK20181442). This project is also funded by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX18_2491), by Collaborative Innovation Center of Suzhou Nano Science & Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the 111 Project. Y.K.W. also thanks to the financial support of the China Scholarship Council (No. 201806920067).
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/1/1
Y1 - 2020/1/1
N2 - 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 sp3-hybrid carbon-centered donor–σ–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 ≈18% external quantum efficiency.
AB - 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 sp3-hybrid carbon-centered donor–σ–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 ≈18% external quantum efficiency.
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U2 - 10.1002/adom.201901150
DO - 10.1002/adom.201901150
M3 - Article
AN - SCOPUS:85075754378
VL - 8
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 2
M1 - 1901150
ER -