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<p>Organic light-emitting diodes (OLEDs) have been developed to enhance device lifetime, efficiency, and operational stability. However, the widely used hole injection layer (HIL) material poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) exhibits limitations such as high work function and acidity, which degrade device performance. This study introduces a [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) self-assembled monolayer (SAM) as an alternative to PEDOT:PSS. 2PACz-based OLEDs achieved lower turn-on voltages and higher external quantum efficiencies (EQEs) compared with PEDOT:PSS-based devices. The maximum EQE of green and red fiber organic light emitting diodes (FOLEDs) were 10.71% and 8.97%, respectively, representing 16.9% and 12.9% improvements compared with those of reference devices using PEDOT:PSS as the HIL. Furthermore, compared with TiO<sub>2</sub> fiber-shaped dye-sensitized solar cells (FS-DSSCs), the incorporation of TiO<sub>2</sub>/2PACz increased the power conversion efficiency (PCE) from 5.67% to 6.53%, corresponding to an improvement of approximately 17%. Notably, the TiO<sub>2</sub>/2PACz-based fiber-shaped gas sensors (FS-GSs) also exhibited enhanced gas sensing characteristics, including increased response and sensitivity, highlighting the multifunctionality and broad applicability of this interfacial engineering strategy across diverse optoelectronic platforms.</p> Graphical abstract

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Interfacial dipole-engineered fiber optoelectronic devices with enhanced efficiency and stability

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月8日

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  • Jae Ho Kim,
  • Youngjin Kim,
  • Yonghun Kim,
  • Jung-Dae Kwon,
  • Jinhee Heo,
  • Byung-Sik Moon,
  • Bo Seung Jang,
  • Dahyun Lee,
  • Won June Kim,
  • Hyung Woo Lee,
  • Myungkwan Song,
  • Jin-Woo Oh

摘要

Organic light-emitting diodes (OLEDs) have been developed to enhance device lifetime, efficiency, and operational stability. However, the widely used hole injection layer (HIL) material poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) exhibits limitations such as high work function and acidity, which degrade device performance. This study introduces a [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) self-assembled monolayer (SAM) as an alternative to PEDOT:PSS. 2PACz-based OLEDs achieved lower turn-on voltages and higher external quantum efficiencies (EQEs) compared with PEDOT:PSS-based devices. The maximum EQE of green and red fiber organic light emitting diodes (FOLEDs) were 10.71% and 8.97%, respectively, representing 16.9% and 12.9% improvements compared with those of reference devices using PEDOT:PSS as the HIL. Furthermore, compared with TiO2 fiber-shaped dye-sensitized solar cells (FS-DSSCs), the incorporation of TiO2/2PACz increased the power conversion efficiency (PCE) from 5.67% to 6.53%, corresponding to an improvement of approximately 17%. Notably, the TiO2/2PACz-based fiber-shaped gas sensors (FS-GSs) also exhibited enhanced gas sensing characteristics, including increased response and sensitivity, highlighting the multifunctionality and broad applicability of this interfacial engineering strategy across diverse optoelectronic platforms.

Graphical abstract