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<p>Fully <i>π</i>-conjugated polymers are promising for flexible optoelectronics; however, their inherent brittleness poses a challenge for achieving high-performance flexible electronic devices. In this study, we developed a carbazole-based semiconductor fluid plasticizer, TODPFCZ, to simultaneously enhance the stretchability and optoelectronic properties of poly(9,9-di-n-octylfluorene-<i>alt</i>-benzothiadiazole) (F8BT) films using an external plasticizing strategy. The fluid TODPFCZ molecules incorporated into the F8BT matrix disrupted interchain <i>π</i>-<i>π</i> stacking and crystallinity, which significantly enhanced the stretchability, increasing the fracture strain from 18% to 44% and the crack-onset strain from 5% to 35%. Owing to the efficient energy transfer from TODPFCZ to F8BT, polymer light-emitting diodes (PLEDs) based on the optimized blend films showed stable electroluminescence and maintained efficiency even after being pre-strained up to 15%, revealing outstanding stress tolerance. The blended films also exhibited excellent recoverability and thermoplasticity. This study demonstrates that carbazole-based semiconductor fluid plasticizers provide a versatile and effective pathway for designing high-performance, intrinsically stretchable, fully <i>π</i>-conjugated polymers for durable flexible electronics.</p>

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Intrinsically Stretchable Films via Blending Conjugated Polymer and Carbazole Semiconductor Fluid Plasticizer for Flexible Polymer Light-emitting Diodes

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Ying-Ying Zheng,
  • Zhi-Qiang Zhuo,
  • Ning-Ning Yu,
  • Ming-Jian Ni,
  • Li-Li Sun,
  • Bin Liu,
  • Jing-Yao Ma,
  • You-Tian Tao,
  • Jin-Yi Lin,
  • Man Xu,
  • Wei Huang

摘要

Fully π-conjugated polymers are promising for flexible optoelectronics; however, their inherent brittleness poses a challenge for achieving high-performance flexible electronic devices. In this study, we developed a carbazole-based semiconductor fluid plasticizer, TODPFCZ, to simultaneously enhance the stretchability and optoelectronic properties of poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) films using an external plasticizing strategy. The fluid TODPFCZ molecules incorporated into the F8BT matrix disrupted interchain π-π stacking and crystallinity, which significantly enhanced the stretchability, increasing the fracture strain from 18% to 44% and the crack-onset strain from 5% to 35%. Owing to the efficient energy transfer from TODPFCZ to F8BT, polymer light-emitting diodes (PLEDs) based on the optimized blend films showed stable electroluminescence and maintained efficiency even after being pre-strained up to 15%, revealing outstanding stress tolerance. The blended films also exhibited excellent recoverability and thermoplasticity. This study demonstrates that carbazole-based semiconductor fluid plasticizers provide a versatile and effective pathway for designing high-performance, intrinsically stretchable, fully π-conjugated polymers for durable flexible electronics.