Scholarlink

<p>Organic light-emitting diodes (OLEDs) have garnered significant attention for their potential in next-generation display technologies, necessitating the development of emitters that combine high efficiency with superior color purity. In this work, an effective approach by integrating spiro-locking motifs and peripheral substitutions is implanted into multiple resonance (MR) frameworks. The rigid and bulky spiro-locking unit suppresses the vibrations and mitigates aggregation tendencies, preserving the narrow full width at half-maximum (FWHM) in doped films. Peripheral substitutions provide a fine tuning of emission to pure green region. This structural design also facilitates a high horizontal dipole ratio, leading to external quantum efficiencies (EQEs) of 29.5% for LL108 and 24.4% for LL125, with FWHMs less than 30 nm. These devices achieved Commission Internationale de l’Éclairage coordinates of (0.20, 0.71) and (0.18, 0.72) for LL108 and LL125, respectively, closely aligning with the BT.2020 standard for green emission. Sensitized OLEDs exhibit enhanced electroluminescent performance, achieving a maximum EQE of 30.3% and significantly reduced efficiency roll-off. Although a slight decrease in color purity is observed, optimization through the selection of more compatible sensitizers is feasible. Our study underscores the potential of spiro-locking designs in developing efficient, high color-purity green emitters, contributing to the advancement of OLEDs for ultrahigh-definition displays.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fine tuning of spiro-locking multi-resonance thermally activated delayed fluorescent emitter for efficient green electroluminescence approaching BT.2020

  • 期刊论文

  • 发表日期：

    2025年9月11日

查看全文
  • Jiamin Liu,
  • Zhenghao Zhang,
  • Yang Liu,
  • Jiahui Liu,
  • Jingsheng Miao,
  • He Liu,
  • Chuluo Yang

摘要

Organic light-emitting diodes (OLEDs) have garnered significant attention for their potential in next-generation display technologies, necessitating the development of emitters that combine high efficiency with superior color purity. In this work, an effective approach by integrating spiro-locking motifs and peripheral substitutions is implanted into multiple resonance (MR) frameworks. The rigid and bulky spiro-locking unit suppresses the vibrations and mitigates aggregation tendencies, preserving the narrow full width at half-maximum (FWHM) in doped films. Peripheral substitutions provide a fine tuning of emission to pure green region. This structural design also facilitates a high horizontal dipole ratio, leading to external quantum efficiencies (EQEs) of 29.5% for LL108 and 24.4% for LL125, with FWHMs less than 30 nm. These devices achieved Commission Internationale de l’Éclairage coordinates of (0.20, 0.71) and (0.18, 0.72) for LL108 and LL125, respectively, closely aligning with the BT.2020 standard for green emission. Sensitized OLEDs exhibit enhanced electroluminescent performance, achieving a maximum EQE of 30.3% and significantly reduced efficiency roll-off. Although a slight decrease in color purity is observed, optimization through the selection of more compatible sensitizers is feasible. Our study underscores the potential of spiro-locking designs in developing efficient, high color-purity green emitters, contributing to the advancement of OLEDs for ultrahigh-definition displays.