A Rigid Multiple Resonance Thermally Activated Delayed Fluorescence Core Toward Stable Electroluminescence and Lasing

Xun Tang, Mingchen Xie, Zesen Lin, Kirill Mitrofanov, Tuul Tsagaantsooj, Yi Ting Lee, Ryota Kabe, Atula S.D. Sandanayaka, Toshinori Matsushima, Takuji Hatakeyama, Chihaya Adachi

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

The investigation of organic light-emitting diodes (OLEDs) and organic laser devices with thermally activated delayed fluorescence (TADF) molecules is emerging due to the potential of harnessing triplets. In this work, a boron/nitrogen multiple-resonance TADF polycyclic framework fusing carbazole units (CzBNPh) was proposed. CzBNPh exhibited a narrowband emission (<30 nm), a unity photoluminescence quantum yield, and a fast radiative rate. Consequently, CzBNPh demonstrated a low distributed feedback (DFB) lasing threshold of 0.68 μJ cm−2. Furthermore, the stimulated emission zone of CzBNPh was effectively separated from its singlet and triplet absorption, thereby minimizing the singlet-triplet annihilation under long-pulsed excitation ranging from 20 μs to 2.5 ms. Significantly, the enhanced rigid molecular conformation, thermal stability, and photo-stability resulted in improved lasing and electroluminescence stability compared to that of 5,9-diphenyl-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracene (DABNA)-core. These findings indicate the potential of CzBN-core as a promising framework for achieving long-pulsed wave and electrically-pumped lasing in the future.

本文言語英語
論文番号e202315210
ジャーナルAngewandte Chemie - International Edition
63
2
DOI
出版ステータス出版済み - 1月 8 2024

!!!All Science Journal Classification (ASJC) codes

  • 触媒
  • 化学一般

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