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
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 -