Scholarlink

<p>Dicarbazole (DCZ) derivatives, a class of nitrogen-containing heterocyclic polyaromatics, have gained attention for their excellent hole mobility, thermal stability, and electrochemical durability in organic optoelectronics. However, achieving both high stability and high triplet energy in one molecule remains rare, limiting blue OLED performance. To address this, an iron-catalyzed oxidative dimerization of carbazoles using air as the oxidant is developed, yielding 9H-1,9’-dicarbazole (19DCZ) via ortho-selective C–H amination. Computational studies reveal that a hydride-bridged iron dimer intermediate lowers the reaction energy barrier. 19DCZ derivatives (DCZ-1 and DCZ-2) demonstrate high efficiency as hosts and electron blocking layers in deep blue OLEDs, with EQEmax up to 22% and power efficiencies over 30 lm/W. Notably, the devices show significantly improved lifetimes, with LT60 reaching 114–118 h—over 3.5 times longer than the reference. This approach introduces a new class of high-performance materials for stable, efficient deep blue OLEDs.</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

Sustainable iron-catalyzed carbazole dimerization for high triplet host/electron blocking materials of efficient deep blue OLEDs

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月12日

查看全文
  • Hiroshi Matsuda,
  • Seong Hwan Hong,
  • Seihwan Ahn,
  • Ramon Francisco Avena,
  • Yeonju Jeong,
  • Kyo Min Hwang,
  • Euncheol Son,
  • Sunwoo Kang,
  • Soo-Byung Ko,
  • Taekyung Kim,
  • Masaharu Nakamura

摘要

Dicarbazole (DCZ) derivatives, a class of nitrogen-containing heterocyclic polyaromatics, have gained attention for their excellent hole mobility, thermal stability, and electrochemical durability in organic optoelectronics. However, achieving both high stability and high triplet energy in one molecule remains rare, limiting blue OLED performance. To address this, an iron-catalyzed oxidative dimerization of carbazoles using air as the oxidant is developed, yielding 9H-1,9’-dicarbazole (19DCZ) via ortho-selective C–H amination. Computational studies reveal that a hydride-bridged iron dimer intermediate lowers the reaction energy barrier. 19DCZ derivatives (DCZ-1 and DCZ-2) demonstrate high efficiency as hosts and electron blocking layers in deep blue OLEDs, with EQEmax up to 22% and power efficiencies over 30 lm/W. Notably, the devices show significantly improved lifetimes, with LT60 reaching 114–118 h—over 3.5 times longer than the reference. This approach introduces a new class of high-performance materials for stable, efficient deep blue OLEDs.