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<p>Solution-processed blue organic light-emitting diodes (OLEDs) based on polycyclic aromatic hydrocarbon face challenges in achieving high efficiency and color purity. We designed a novel host-dopant system featuring a naphthalene indenofluorene (NIF) building block, comprising blue emitter NIF-<i>p</i>-TPA and host material NIF-<i>m</i>-PCz. The two asymmetric molecules exhibited good solubility in chlorobenzene and miscibility in their blend films. By combining cross-linkable hole-transport and alcohol-soluble electron-transport function layers, solution-processed OLEDs with doped and non-doped emission layers were fabricated. The optimized device achieved current efficiency of 3.20&#xa0;cd&#xa0;A<sup>−1</sup> and Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.12) at a doping ratio of NIF-<i>m</i>-PCz:NIF-<i>p</i>-TPA = 90:10&#xa0;wt/wt. This work demonstrates a practical approach to solution-processed deep-blue OLEDs using carefully designed polycyclic aromatic systems.</p> Graphical Abstract <p></p>

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Small-Molecule Host-Dopant Based on Naphthalene Indenofluorene Unit for Solution-Processed Blue OLEDs

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Weiji Feng,
  • Guohong Cui,
  • Liwen Hu,
  • Feng Peng,
  • Jin Xu,
  • Mingke Li,
  • Lei Ying,
  • Zhiming Zhong,
  • Zhenzhong Sun

摘要

Solution-processed blue organic light-emitting diodes (OLEDs) based on polycyclic aromatic hydrocarbon face challenges in achieving high efficiency and color purity. We designed a novel host-dopant system featuring a naphthalene indenofluorene (NIF) building block, comprising blue emitter NIF-p-TPA and host material NIF-m-PCz. The two asymmetric molecules exhibited good solubility in chlorobenzene and miscibility in their blend films. By combining cross-linkable hole-transport and alcohol-soluble electron-transport function layers, solution-processed OLEDs with doped and non-doped emission layers were fabricated. The optimized device achieved current efficiency of 3.20 cd A−1 and Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.12) at a doping ratio of NIF-m-PCz:NIF-p-TPA = 90:10 wt/wt. This work demonstrates a practical approach to solution-processed deep-blue OLEDs using carefully designed polycyclic aromatic systems.

Graphical Abstract