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Efficient and Stable Thick-Layer Non-Doped Organic Light-Emitting Diodes Based on Bipolar Aggregation-Induced Delayed Fluorescence Materials

QIN Jiayi1, CHEN Ziwei1, ZENG Jiajie1, FU Yan,1,* TANG Ben Zhong2, ZHAO Zujin1,*   

  1. 1. State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology 2. Guangdong Basic Research Center of Excellence for Aggregate Science, School of Science and Engineering, The Chinese University of Hong Kong

  • Received:2026-01-04 Revised:2026-02-20 Online First:2026-02-22 Published:2026-02-22
  • Contact: Zujin Zhao E-mail:mszjzhao@scut.edu.cn
  • Supported by:
    supported by the National Natural Science Foundation of China (No.U23A20594 and No.22375066), the GuangDong Basic and Applied Basic Research Foundation (No.2023B1515040003) and State Key Laboratory of Luminescent Materials and Devices, South China University of Technology (Skllmd-2024-06)

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Abstract: Thick-layer organic light-emitting diodes (OLEDs) comprising one single thick film to simultaneously transport carriers and emit light offer significant advantages in simplifying fabrication process and enhancing operational stability. However, achieving highly efficient thick-layer non-doped OLEDs requires emitters possessing balanced bipolar carrier transport, strong solid-state emission and high exciton utilization, which impose high requirements on designing luminescent materials. In this work, two representative bipolar aggregation-induced delayed fluorescence (AIDF) emitters are employed to fabricate such thick-layer non-doped devices. Excellent electroluminescence (EL) performances are attained with low turn-on voltages (2.5 V), high external quantum efficiencies (19.8%), and negligible efficiency roll-off at high luminance. Furthermore, the operational lifetime of the thick-layer device increases by more than twofold compared to that of the thin-layer devices. In addition, high-efficiency, high-color-purity simplified thick-layer hyperfluorescence OLEDs are also achieved by using their thick neat films as sensitizers for multi-resonance emitter. These results indicate that the bipolar AIDF emitters are promising candidates for constructing simple thick-layer OLEDs, which provides a feasible strategy for developing highly efficient and stable OLEDs.

Key words: Aggregation-induced delayed fluorescence, Organic light-emitting diode (OLED), Thick-layer non-doped OLED, Balanced bipolar charge transport, Hyperfluorescence

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