首页|Towards Efficient Blue Delayed-Fluorescence Molecules by Modulating Torsion Angle Between Electron Donor and Acceptor
Towards Efficient Blue Delayed-Fluorescence Molecules by Modulating Torsion Angle Between Electron Donor and Acceptor
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Constructing blue thermally activated delayed-fluorescence materials for high-performance organic light-emitting diodes(OLEDs)remains challenging due to the intrinsically strong intramolecular charge transfer nature of the nearly orthogonal connection of electron donor(D)and acceptor(A),which results in long-wavelength emission.Herein,an effective delayed-fluorescence design strategy of modulating D-A torsion angles is proposed and efficient sky-blue,pure-blue,and deep-blue delayed-fluorescence mole-cules consisting of a xanthenone acceptor and carba-zole-based donors are created by decreasing the torsion angles.They exhibit strong delayed fluores-cence with high photoluminescence quantum yields of 85-94％in doped films,and their delayed-fluores-cence lifetimes are elongated from 1.0 to 27.6 μs as the torsion angles decrease.These molecules can func-tion as excellent emitters in OLEDs,providing efficient electroluminescence peaking at 442 nm(CIEx,y=0.15,0.08),462 nm(CIEx,y=0.15,0.18),and 482 nm(ClEx,y=0.17,0.30)with state-of-the-art external quantum efficiencies of up to 22.2％,33.7％,and 32.1％,respectively,demonstrating the proposed mo-lecular design for efficient blue delayed-fluorescence molecules is successful and promising.
blue luminescent materialthermally acti-vated delayed fluorescencetorsion angleelectrolu-minescenceorganic light-emitting diode
State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology,Guangzhou 510640
School of Science and Engineering,Shenzhen Institute of Aggregate Science and Technology,The Chinese University of Hong Kong,Shenzhen,Guangdong 518172
AIE Institute,Guangzhou Development District,Huangpu,Guangzhou 510530
国家自然科学基金广东省自然科学基金State Key Lab of Luminescent Materials and Devices,South China University of Technology
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