TY - JOUR
T1 - Dual Multiresonance Core Strategy Enable Efficient Pure Blue Organic Light-Emitting Devices Based on Fluorene Linkages
AU - Song, Xiangan
AU - Shen, Shaogang
AU - He, Binghong
AU - Zou, Shengnan
AU - Vaitusionak, Aliaksei A.
AU - Kostjuk, Sergei V.
AU - Wang, Yafei
AU - Wang, Ying
AU - Zhang, Yong
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024/11/14
Y1 - 2024/11/14
N2 - Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters with high color purity in virtue of their inherent narrowband emission have received great interest in organic light-emitting diodes (OLEDs). However, it remains a big challenge to develop the ultrapure blue MR-TADF emitters with high efficiency. In this work, a novel “dual-MR-core” strategy is proposed by connecting two parent N-B-O-skeletons with non-conjugate 9-position substituted fluorene linkages for high efficient deep-blue MR-TADF emitters, namely H-FOBN and Me-FOBN, which possess the highly twisted structure with suppressed aggregation. Finally, the vacuum-deposited deep-blue OLED exhibits excellent external quantum efficiency (EQE) of 25.1% with small full width at half maximum (FWHM) of 28 nm, as well as CIE of (0.14, 0.08). Furthermore, owing to enhanced solubility, the solution-processed deep-blue OLED based on Me-FOBN shows EQE of 11.3%, with small FWHM of 32 nm and CIE of (0.14,0.09). These outstanding performances confirm that this “dual-MR-core” strategy provides a feasible approach to develop high efficient ultrapure blue MR-TADF emitters.
AB - Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters with high color purity in virtue of their inherent narrowband emission have received great interest in organic light-emitting diodes (OLEDs). However, it remains a big challenge to develop the ultrapure blue MR-TADF emitters with high efficiency. In this work, a novel “dual-MR-core” strategy is proposed by connecting two parent N-B-O-skeletons with non-conjugate 9-position substituted fluorene linkages for high efficient deep-blue MR-TADF emitters, namely H-FOBN and Me-FOBN, which possess the highly twisted structure with suppressed aggregation. Finally, the vacuum-deposited deep-blue OLED exhibits excellent external quantum efficiency (EQE) of 25.1% with small full width at half maximum (FWHM) of 28 nm, as well as CIE of (0.14, 0.08). Furthermore, owing to enhanced solubility, the solution-processed deep-blue OLED based on Me-FOBN shows EQE of 11.3%, with small FWHM of 32 nm and CIE of (0.14,0.09). These outstanding performances confirm that this “dual-MR-core” strategy provides a feasible approach to develop high efficient ultrapure blue MR-TADF emitters.
KW - dual-MR-core
KW - multi-resonance
KW - pure deep blue
KW - solution process
KW - thermally activated delayed fluorescence
UR - https://www.scopus.com/pages/publications/85202769276
U2 - 10.1002/adom.202401505
DO - 10.1002/adom.202401505
M3 - 文章
AN - SCOPUS:85202769276
SN - 2195-1071
VL - 12
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 32
M1 - 2401505
ER -