Citation: Shen Xu, Qingqing Yang, Ying Zhang, Hui Li, Qin Xue, Guohua Xie, Minzhao Gu, Jibiao Jin, Ling Huang, Runfeng Chen. Solution-processed multi-resonance organic light-emitting diodes with high efficiency and narrowband emission[J]. Chinese Chemical Letters, ;2021, 32(4): 1372-1376. doi: 10.1016/j.cclet.2020.10.022 shu

Solution-processed multi-resonance organic light-emitting diodes with high efficiency and narrowband emission

Shen Xu ^{a, b} ,
Qingqing Yang ^a ,
Ying Zhang ^a ,
Hui Li ^a ,
Qin Xue ^c ,
Guohua Xie ^{c, *,} ,
Minzhao Gu ^a ,
Jibiao Jin ^a ,
Ling Huang ^{b, *,} ,
Runfeng Chen ^{a, *,}

a.
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
b.
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China
c.
Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, China

addresses: guohua.xie@whu.edu.cn

iamlhuang@njtech.edu.cn

iamrfchen@njupt.edu.cn

Received Date: 22 July 2020
Revised Date: 15 October 2020
Accepted Date: 19 October 2020
Available Online: 22 October 2020

Figures(4)

With excellent color purity (full-width half maximum (FWHM) < 40 nm) and high quantum yield, multi-resonance (MR) molecules can harvest both singlet and triplet excitons for highly efficient narrowband organic light-emitting diodes (OLEDs) owing to their thermally activated delayed fluorescence (TADF) nature. However, the highly rigid molecular skeleton with the oppositely positioned boron and nitrogen in generating MR effects results in the intrinsic difficulties in the solution-processing of MR-OLEDs. Here, we demonstrate a facile strategy to increase the solubility, enhance the efficiencies and modulate emission color of MR-TADF molecules by extending aromatic rings and introducing tert-butyls into the MR backbone. Two MR-TADF emitters with smaller singlet-triplet splitting energies (ΔE_ST) and larger oscillator strengths were prepared conveniently, and the solution-processed MR-OLEDs were fabricated for the first time, exhibiting efficient bluish-green electroluminescence with narrow FWHM of 32 nm and external quantum efficiency of 16.3%, which are even comparable to the state-of-the-art performances of the vacuum-evaporated devices. These results prove the feasibility of designing efficient solution-processible MR molecules, offering important clues in developing high-performance solution-processed MR-OLEDs with high efficiency and color purity.
- Multi-resonance,
- Thermally activated delayed fluorescence,
- Solution-processed devices,
- Charge-transfer delocalization,
- Narrowband emission
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