Scholarlink

<p>Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are critical for realizing high-color-purity organic light-emitting diodes (OLEDs), and the indolocarbazole (ICz) core provides a promising platform for efficient blue-green to red emitters. Herein, three MR-TADF emitters (1BNTPh, 2BNTPh, and 3BNTPh) were developed by utilizing the intrinsic steric hindrance of 5,12-dihydroindolo[3,2-<i>a</i>]carbazole and subtly modulating the site-preferential borylation outcome in Bora-Friedel-Crafts reaction. In toluene, these materials achieve blue emission with peaks at 460, 461, and 470 nm, narrow full widths at half maximum (FWHMs) of 18, 17, and 18 nm, respectively. All emitters also show high photoluminescence quantum yields exceeding 90% in doped films. The OLEDs with 1BNTPh and 2BNTPh emit blue electroluminescence with FWHMs of 22 and 21 nm and maximum external quantum efficiency (EQE<sub>max</sub>) of 34.1% and 35.4%, respectively, outperforming previously reported ICz-based blue MR-TADF emitters. Notably, the 2BNTPh-based hyperfluorescent OLED realizes an EQE<sub>max</sub> of 40.9%. This work provides a feasible steric-hindrance-mediated borylation strategy, enabling the formation of distinct borylation patterns within ICz-based MR-TADF frameworks.</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

High-efficiency blue MR-TADF emitters constructed by steric-hindrance borylation of indolocarbazole derivatives

  • 期刊论文

  • 发表日期：

    2026年5月26日

查看全文
  • Yi-Fan Yang,
  • Shuai Xing,
  • Zhi-Ping Yan,
  • Yi Wei,
  • Jia-Zhen Zhu,
  • Jun-Wei Xu,
  • Li Yuan,
  • You-Xuan Zheng

摘要

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are critical for realizing high-color-purity organic light-emitting diodes (OLEDs), and the indolocarbazole (ICz) core provides a promising platform for efficient blue-green to red emitters. Herein, three MR-TADF emitters (1BNTPh, 2BNTPh, and 3BNTPh) were developed by utilizing the intrinsic steric hindrance of 5,12-dihydroindolo[3,2-a]carbazole and subtly modulating the site-preferential borylation outcome in Bora-Friedel-Crafts reaction. In toluene, these materials achieve blue emission with peaks at 460, 461, and 470 nm, narrow full widths at half maximum (FWHMs) of 18, 17, and 18 nm, respectively. All emitters also show high photoluminescence quantum yields exceeding 90% in doped films. The OLEDs with 1BNTPh and 2BNTPh emit blue electroluminescence with FWHMs of 22 and 21 nm and maximum external quantum efficiency (EQEmax) of 34.1% and 35.4%, respectively, outperforming previously reported ICz-based blue MR-TADF emitters. Notably, the 2BNTPh-based hyperfluorescent OLED realizes an EQEmax of 40.9%. This work provides a feasible steric-hindrance-mediated borylation strategy, enabling the formation of distinct borylation patterns within ICz-based MR-TADF frameworks.