Perturbing Localization of Electron Distribution in Thermally Activated Delayed Fluorescence Emitters for Efficient Red Electroluminescence

Authors

  • Hengyuan Zhang School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Ming Zhang School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Hao Zhuo School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Haoyu Yang School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Hui Lin School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Silu Tao School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China
  • Caijun Zheng School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China

DOI:

https://doi.org/10.54097/54c5kn44

Keywords:

Electron distribution, efficient red electroluminescence, phenoxazine (PXZ).

Abstract

To compete with the severe non-radiative decay in long-wavelength emission, fast radiative decay is significantly required. Due to good rigidity and strong electron-donating ability, phenoxazine (PXZ) is a promising donor group to be applied in long-wavelength thermally activated delayed fluorescence emitters. However, PXZ-based molecules show highly twisted geometry, which reduces the oscillator strength and limits their performance. Herein, we demonstrate that the oscillator strength can be enhanced without compromising the molecular rigidity by strategically increasing localization of electron distribution in PXZ-based emitters. The corresponding red organic light-emitting diode showed a maximum external quantum efficiency of 11.7%, demonstrating an improvement of 39% compared with the control group.

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References

[1] Uoyama, H., Goushi, K., Shizu, K., Nomura, H., & Adachi, C. (2012). Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 492, 234–238. https://doi.org/10.1038/nature11687

[2] Zhang, M., Zheng, C.-J., Lin, H., & Tao, S.-L. (2021). Thermally activated delayed fluorescence exciplex emitters for high-performance organic light-emitting diodes. Materials Horizons, 8, 401–425. https://doi.org/10.1039/D0MH01245A

[3] Zhang, H.-Y., Zhang, M., Zhuo, H., Yang, H.-Y., Han, B., Zheng, Y.-H., Wang, H., Lin, H., Tao, S.-L., Zheng, C.-J., & Zhang, X.-H. (2024). Unraveling non-radiative decay channels of exciplexes to construct efficient red emitters for organic light-emitting diodes. Chemical Science, 15, 14651–14659. https://doi.org/10.1039/D4SC03667K

[4] Zhang, M., Sun, D., Wang, K., Chen, J., Zhou, Y., Zhang, H., Zhuo, H., Xiong, Z., Lin, H., Tao, S., Zheng, C., & Zhang, X. (2024). Dendritic oligomers‐based exciplex emitters realizing solution‐processed organic light‐emitting diodes with nearly 30% external quantum efficiency. Advanced Functional Materials, 2414808. https://doi.org/10.1002/adfm.202414808

[5] Dos Santos, J. M., Hall, D., Basumatary, B., Bryden, M., Chen, D., Choudhary, P., Comerford, T., Crovini, E., Danos, A., De, J., Diesing, S., Fatahi, M., Griffin, M., Gupta, A. K., Hafeez, H., Hämmerling, L., Hanover, E., Haug, J., Heil, T., … Zysman-Colman, E. (2024). The golden age of thermally activated delayed fluorescence materials: Design and exploitation. Chemical Reviews. https://doi.org/10.1021/acs.chemrev.3c00755

[6] Ghosh, P., Alvertis, A. M., Chowdhury, R., Murto, P., Gillett, A. J., Dong, S., Sneyd, A. J., Cho, H.-H., Evans, E. W., Monserrat, B., Li, F., Schnedermann, C., Bronstein, H., Friend, R. H., & Rao, A. (2024). Decoupling excitons from high-frequency vibrations in organic molecules. Nature, 629, 355–362. https://doi.org/10.1038/s41586-024-07246-x

[7] Kim, J. H., Yun, J. H., & Lee, J. Y. (2018). Recent progress of highly efficient red and near‐infrared thermally activated delayed fluorescent emitters. Advanced Optical Materials, 6, 1800255. https://doi.org/10.1002/adom.201800255

[8] Yang, H.-Y., Zhang, H.-Y., Zhang, M., Zhuo, H., Wang, H., Lin, H., Tao, S.-L., Zheng, C.-J., & Zhang, X.-H. (2023). Simultaneously optimizing radiative decay and up-conversion of triphenylamine-based thermally activated delayed fluorescence emitters to achieve efficient deep-red organic light-emitting diodes. Chemical Engineering Journal, 468, 143721. https://doi.org/10.1016/j.cej.2023.143721

[9] Shi, Y.-Z., Wang, K., Zhang, S.-L., Fan, X.-C., Tsuchiya, Y., Lee, Y.-T., Dai, G.-L., Chen, J.-X., Zheng, C.-J., Xiong, S.-Y., Ou, X.-M., Yu, J., Jie, J.-S., Lee, C.-S., Adachi, C., & Zhang, X.-H. (2021). Characterizing the conformational distribution in an amorphous film of an organic emitter and its application in a “self-doping” organic light-emitting diode. Angewandte Chemie International Edition, 60, 25878–25883. https://doi.org/10.1002/anie.202108943

[10] Zhang, H.-Y., Yang, H.-Y., Zhang, M., Lin, H., Tao, S.-L., Zheng, C.-J., & Zhang, X.-H. (2022). A novel orange-red thermally activated delayed fluorescence emitter with high molecular rigidity and planarity realizing 32.5% external quantum efficiency in organic light-emitting diodes. Materials Horizons, 9, 2425–2432. https://doi.org/10.1039/D2MH00639A

[11] Lu, T., & Chen, F. (2012). Multiwfn: A multifunctional wavefunction analyzer. Journal of Computational Chemistry, 33, 580–592. https://doi.org/10.1002/jcc.22885

[12] Liu, Z., Lu, T., & Chen, Q. (2020). An sp-hybridized all-carboatomic ring, cyclo [18] carbon: Bonding character, electron delocalization, and aromaticity. Carbon, 165, 468–475. https://doi.org/10.1016/j.carbon.2020.04.099

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Published

30-06-2026

Issue

Vol. 16 No. 3 (2026)

Section

Articles

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Copyright (c) 2026 Frontiers in Computing and Intelligent Systems

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

How to Cite

Zhang, H., Zhang, M., Zhuo, H., Yang, H., Lin, H., Tao, S., & Zheng, C. (2026). Perturbing Localization of Electron Distribution in Thermally Activated Delayed Fluorescence Emitters for Efficient Red Electroluminescence. Frontiers in Computing and Intelligent Systems, 16(3), 71-76. https://doi.org/10.54097/54c5kn44