Manipulating Spectral Width and Emission Wavelength towards Highly Efficient Blue Asymmetric Carbazole Fused Multi-Resonance Emitters

被引：43
作者：
Lee, Hyuna [1 ]
Braveenth, Ramanaskanda [1 ]
Park, Jae Do [1 ]
Jeon, Chae Yeon [1 ]
Lee, Hyun Seung [1 ]
Kwon, Jang Hyuk [1 ]
机构：
[1] Kyung Hee Univ, Dept Informat Display, Organ Optoelect Device Lab OODL, Seoul 02447, South Korea
来源：
ACS APPLIED MATERIALS & INTERFACES | 2022年 / 14卷 / 32期
基金：
新加坡国家研究基金会;
关键词：
DABNA; TADF; deep blue; vibronic transition; Huang-Rhys factor; FLUORESCENCE; ABSORPTION; LIFETIME;
D O I：
10.1021/acsami.2c10127
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The novel carbazole-based multiresonance types of thermally activated delayed fluorescence (MR-TADF) emitters of mICz-DABNA and BFCz-DABNA are reported, and their spectroscopic properties are investigated with the inductive effect on the central nitrogen atom for pure and deep blue emission. With the introduction of electron-donating/-withdrawing properties of substituents, emitters exhibited the bathochromic/hypsochromic shifted emission, respectively, compared to simple carbazole-based MR-TADF. Moreover, their spectral bandwidths became narrower. Theoretical calculation indicated that the meta-positioned bulky moiety restricts the molecular geometry discrepancy and reduces the Huang-Rhys factors. Particularly, the organic light-emitting diode (OLED) with 3% BFCz-DABNA exhibited the maximum external quantum efficiency of 28.0% with the Commission International de l'Eclairage (CIE) of (0.13, 0.09), which is the best record value among single-boron MR-TADF devices of CIE y < 0.10.
引用
收藏
页码：36927 / 36935
页数：9
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