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<p>Long-range exciton transport in organic semiconductors is essential for the performance of optoelectronic devices. However, solution-processed π-conjugated polymers films typically exhibit short exciton diffusion lengths (&lt;20 nm) due to local imperfections or variations in interchain packing. Here, large-area submillimeter-scale spherulites are achieved by treating the spin-coated polydiarylfluorene film under solvent vapor annealing. The exciton diffusion length, visualized using transient photoluminescence microscopy, is determined to be an average of 186 nm, with a corresponding diffusion coefficient of 0.14 cm<sup>2 </sup>s<sup>-1</sup>. Notably, the maximum value of exciton diffusion lengths and diffusion coefficient can reach up to approximately 396 nm and 0.63 cm<sup>2 </sup>s<sup>-1</sup>, respectively. Well-ordered hierarchical structure with an outstanding chain alignment in spherulite provides a uniform excitonic energy landscape, enabling ultralong exciton diffusion. The reduced defect density in the spherulite film may result in shallower trap states, facilitating exciton diffusion and radiative recombination. Polymer light-emitting diodes based on submillimeter-scale spherulite films exhibit deep-blue electroluminescence with high brightness (4897 cd m<sup>-2</sup>) at low current density and good color purity. These findings demonstrate that the long-range ordered spherulite structure can significantly enhance the excitons transport and improve the overall optoelectronic property.</p>

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Ultralong-range exciton transport in submillimeter-scale spherulite film of π-conjugated polymers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Lili Sun,
  • Yong Yuan,
  • Yang Xu,
  • Chuanxin Wei,
  • Mingjian Ni,
  • Zhiqiang Zhuo,
  • Yingying Zheng,
  • Xilai Jia,
  • Jiangli Cai,
  • Xiang An,
  • Jingmin Wang,
  • Yahui Zhang,
  • Qiang Zhao,
  • Yamin Han,
  • Bin Liu,
  • Hong-Hua Fang,
  • Chunfeng Zhang,
  • Chen Sun,
  • Man Xu,
  • Lubing Bai,
  • Jianming Zhang,
  • Jinyi Lin,
  • Wei Huang

摘要

Long-range exciton transport in organic semiconductors is essential for the performance of optoelectronic devices. However, solution-processed π-conjugated polymers films typically exhibit short exciton diffusion lengths (<20 nm) due to local imperfections or variations in interchain packing. Here, large-area submillimeter-scale spherulites are achieved by treating the spin-coated polydiarylfluorene film under solvent vapor annealing. The exciton diffusion length, visualized using transient photoluminescence microscopy, is determined to be an average of 186 nm, with a corresponding diffusion coefficient of 0.14 cm2 s-1. Notably, the maximum value of exciton diffusion lengths and diffusion coefficient can reach up to approximately 396 nm and 0.63 cm2 s-1, respectively. Well-ordered hierarchical structure with an outstanding chain alignment in spherulite provides a uniform excitonic energy landscape, enabling ultralong exciton diffusion. The reduced defect density in the spherulite film may result in shallower trap states, facilitating exciton diffusion and radiative recombination. Polymer light-emitting diodes based on submillimeter-scale spherulite films exhibit deep-blue electroluminescence with high brightness (4897 cd m-2) at low current density and good color purity. These findings demonstrate that the long-range ordered spherulite structure can significantly enhance the excitons transport and improve the overall optoelectronic property.