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<p>Organic light-emitting transistors integrate the switching ability of a transistor with the emissive property of an organic light-emitting diode. Among them, organic field-effect light-emitting transistors (OFE-LETs) have recently gained increasing attention due to their simplified device structure, low leakage current and ease of integration. However, OFE-LETs often suffer from unbalanced electron and hole transport, leading to a low radiative recombination efficiency in the emissive layer and low device efficiency. Here we present a promising device architecture in which the functions of charge-carrier transport and light emission are spatially separated, enabling precise exciton management. The use of carbazole/oxadiazole hybrid molecules coupled with a strong electron-withdrawing cyano moiety results in balanced charge-carrier transport, creating a broad exciton recombination zone and enhancing the radiative recombination efficiency. Accordingly, red, green and blue OFE-LETs achieve peak external quantum efficiencies of 18.4, 21.2 and 14.4%, and current efficiencies of 26.9, 78.0 and 31.7 cd A<sup>−1</sup>, respectively. These values rank among the highest for organic light-emitting transistors so far. Furthermore, the patterned OFE-LET arrays with an aperture ratio of over 60% and pixel circuits that exhibit only 5.6% parasitic power dissipation demonstrate promising potential for low-power-consumption display technologies.</p>

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Exciton management and balanced charge-carrier transport enable efficient organic field-effect light-emitting transistors

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Donghai Li,
  • Yuchen Hou,
  • Jian Wang,
  • Shen Xing,
  • Zihong Shen,
  • Yeting Tao,
  • Yuan Liu,
  • Wenbo Yuan,
  • Xiaowang Liu,
  • Weidong Xu,
  • Xiangchun Li,
  • Karl Leo,
  • Zhongbin Wu,
  • Youtian Tao,
  • Wei Huang

摘要

Organic light-emitting transistors integrate the switching ability of a transistor with the emissive property of an organic light-emitting diode. Among them, organic field-effect light-emitting transistors (OFE-LETs) have recently gained increasing attention due to their simplified device structure, low leakage current and ease of integration. However, OFE-LETs often suffer from unbalanced electron and hole transport, leading to a low radiative recombination efficiency in the emissive layer and low device efficiency. Here we present a promising device architecture in which the functions of charge-carrier transport and light emission are spatially separated, enabling precise exciton management. The use of carbazole/oxadiazole hybrid molecules coupled with a strong electron-withdrawing cyano moiety results in balanced charge-carrier transport, creating a broad exciton recombination zone and enhancing the radiative recombination efficiency. Accordingly, red, green and blue OFE-LETs achieve peak external quantum efficiencies of 18.4, 21.2 and 14.4%, and current efficiencies of 26.9, 78.0 and 31.7 cd A−1, respectively. These values rank among the highest for organic light-emitting transistors so far. Furthermore, the patterned OFE-LET arrays with an aperture ratio of over 60% and pixel circuits that exhibit only 5.6% parasitic power dissipation demonstrate promising potential for low-power-consumption display technologies.