Twisted Biphenyl‐Diimide Derivatives with Aggregation‐Induced Emission and Thermally Activated Delayed Fluorescence for High Performance OLEDs
Source abstract
Abstract
Abstract π‐Conjugated arylene diimide derivatives as a kind of well‐known organic dyes have been widely used as building blocks for constructing n‐type semiconductors. However, the large π‐framework faded their solid‐state emission, which hinders their application in organic light‐emitting diodes (OLEDs). Herein, two novel π‐conjugated donor–acceptor–donor (D‐A‐D) type compounds BPI‐PhPXZ and BPI‐PhDMAC, composed of twisted biphenyl‐diimide (BPI) acceptors and phenoxazine or acridine donors are synthesized. BPI‐PhPXZ and BPI‐PhDMAC show prominent aggregation‐induced emission (AIE) and thermally activated delayed fluorescence (TADF), and enjoy good thermal and electrochemical stabilities. Doped OLEDs fabricated with the two compounds have achieved high external quantum efficiencies (EQEs) of 18.1% and 16.2%, respectively. The results highlight the beneficial role of well‐designed BPI acceptor for the development of efficient D‐A‐D type TADF emitters with AIE properties.
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Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Frontier Institute of Science and Technology State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University Xi'an Shaanxi Province 710054 China
State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 China
Frontier Institute of Science and Technology State Key Laboratory for Strength and Vibration of Mechanical Structures Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of Stomatology Xi'an Jiaotong University Xi'an Shaanxi Province 710054 China
Funding
National Natural Science Foundation of China
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