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<p>Stretchable organic light-emitting diodes (OLEDs) hold great promise for wearable displays and optical biointerfaces, yet progress is hindered by the intrinsic trade-off between mechanical stretchability and high emission efficiency. Here, we present a broadly applicable strategy to enhance both stretchability and light-emitting performance in thermally activated delayed fluorescence (TADF) polymers through the incorporation of optoelectronically inert small-molecule plasticizers. Using dioctyl phthalate (DOP) as a model additive, we show that plasticizers function as molecular spacers, expanding free volume to suppress triplet exciton quenching while facilitating stress-dissipative chain mobility. The resulting composites achieve approaching-unity photoluminescence quantum yield (PLQY), stretchability beyond 110% strain, and improved electroluminescent efficiency, with external quantum efficiency (EQE), reaching 12.6% in rigid devices and 3.05% in fully stretchable OLEDs. This strategy is effective across a range of TADF polymers, demonstrating plasticizer engineering as a simple, scalable design principle for intrinsically stretchable optoelectronic materials.</p>

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Approaching-unity PLQY and high stretchability in polymer emitters via molecular spacers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月22日

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  • Glingna Wang,
  • Wei Liu,
  • Zhiming Zhang,
  • Cheng Zhang,
  • Benjamin T. Diroll,
  • Naisong Shan,
  • Yang Li,
  • Mohammed Syed Nurul Azam Azmir,
  • Xiaodan Gu,
  • Sihong Wang

摘要

Stretchable organic light-emitting diodes (OLEDs) hold great promise for wearable displays and optical biointerfaces, yet progress is hindered by the intrinsic trade-off between mechanical stretchability and high emission efficiency. Here, we present a broadly applicable strategy to enhance both stretchability and light-emitting performance in thermally activated delayed fluorescence (TADF) polymers through the incorporation of optoelectronically inert small-molecule plasticizers. Using dioctyl phthalate (DOP) as a model additive, we show that plasticizers function as molecular spacers, expanding free volume to suppress triplet exciton quenching while facilitating stress-dissipative chain mobility. The resulting composites achieve approaching-unity photoluminescence quantum yield (PLQY), stretchability beyond 110% strain, and improved electroluminescent efficiency, with external quantum efficiency (EQE), reaching 12.6% in rigid devices and 3.05% in fully stretchable OLEDs. This strategy is effective across a range of TADF polymers, demonstrating plasticizer engineering as a simple, scalable design principle for intrinsically stretchable optoelectronic materials.