Solution-processed AIEgen NIR OLEDs with EQE Approaching 15

Ying Yu; Hao Xing; Dan Liu; Mengying Zhao; Herman H-Y Sung; Ian D Williams; Jacky W Y Lam; Guohua Xie; Zheng Zhao; Ben Zhong Tang

doi:10.1002/anie.202204279

Solution-processed AIEgen NIR OLEDs with EQE Approaching 15

Angew Chem Int Ed Engl. 2022 Jun 27;61(26):e202204279. doi: 10.1002/anie.202204279. Epub 2022 Apr 28.

Authors

Ying Yu^{1

2

3

4}, Hao Xing⁴, Dan Liu^{1

2

3}, Mengying Zhao⁴, Herman H-Y Sung⁵, Ian D Williams⁵, Jacky W Y Lam⁴, Guohua Xie^{6

7}, Zheng Zhao^{1

2

3

4}, Ben Zhong Tang^{1

2

3

4}

Affiliations

¹ School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China.
² HKUST-Shenzhen Research Institute, Shenzhen, 518057, China.
³ State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China.
⁴ Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Kowloon, 100071, Hong Kong, China.
⁵ The Hong Kong University of Science and Technology, Kowloon, 100071, Hong Kong, China.
⁶ Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, P. R. China.
⁷ Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology), China.

PMID: 35393763
DOI: 10.1002/anie.202204279

Abstract

Organic near-infrared (NIR) luminogens have attracted intensive attention considering their vast potential applications in areas like bioimaging, organic light-emitting diodes (OLEDs) and night-vision telecommunication. However, organic NIR luminogens with high solid quantum efficiencies are scarce, limiting their applications. Here, we reported an electron-deficient acceptor, BSM, based on dithiafulvalene and benzothiadiazole, which could work as a strong acceptor to produce highly efficient NIR emitters with aggregation-induced emission (AIE) property. One of the AIEgens, TBSMCN emitted at 820 nm with a solid quantum yield of 10.7 %. When applied to solution-processed OLEDs, an outstanding external quantum efficiency (EQE) of 9.4 % was achieved with a peak wavelength at 728 nm. Moreover, its non-doped device could achieve an extraordinary EQE of 2.2 % peaking at 804 nm. In the further optimized configuration, when an extra sensitizer was added to harvest triplet excitons, the EQE unprecedentedly soared up to 14.3 % with a peak wavelength of 750 nm.

Keywords: Aggregation Induced Emission; Near Infrared; Organic Light Emitting Diode; Solution Process; Thermally Activated Delayed Fluorescence.

Abstract

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