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

Author:

Tang Xun1,Xie Mingchen1,Lin Zesen2,Mitrofanov Kirill2,Tsagaantsooj Tuul1,Lee Yi‐Ting13,Kabe Ryota2,Sandanayaka Atula S. D.4,Matsushima Toshinori5,Hatakeyama Takuji6,Adachi Chihaya15ORCID

Affiliation:

1. Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka Nishi, Fukuoka 819-0395 Japan

2. Organic Optoelectronics Unit, Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha Kunigami-gun, Okinawa Onna-son 904-0495 Japan

3. Department of Chemistry Soochow University 70 Linhsi Rd. Shihlin, Taipei Taiwan

4. Department of Physical Sciences and Technologies Faculty of Applied Sciences Sabaragamuwa University of Sri Lanka Belihuloya 70140 Sri Lanka

5. International Institute for Carbon-Neutral Energy Research (WPI−I2CNER) Kyushu University 744 Motooka Nishi, Fukuoka 819-0395 Japan

6. Department of Chemistry Graduate School of Science Kyoto University Kitashirakawa Oiwake-cho Sakyo-ku, Kyoto 606-8502 Japan

Abstract

AbstractThe 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.

Funder

Core Research for Evolutional Science and Technology

Japan Society for the Promotion of Science

Japan Science and Technology Agency

Chinese Government Scholarship

Publisher

Wiley

Subject

General Chemistry,Catalysis

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