Citation: Xiao Yu, Dongyue Cui, Mengmeng Wang, Zhaojin Wang, Mengzhu Wang, Deshuang Tu, Vladimir Bregadze, Changsheng Lu, Qiang Zhao, Runfeng Chen, Hong Yan. Boron cluster-based TADF emitter via through-space charge transfer enabling efficient orange-red electroluminescence[J]. Chinese Chemical Letters, ;2025, 36(3): 110520. doi: 10.1016/j.cclet.2024.110520 shu

Boron cluster-based TADF emitter via through-space charge transfer enabling efficient orange-red electroluminescence

Xiao Yu ^{a, 1} ,
Dongyue Cui ^{b, 1} ,
Mengmeng Wang ^a ,
Zhaojin Wang ^c ,
Mengzhu Wang ^d ,
Deshuang Tu ^a ,
Vladimir Bregadze ^e ,
Changsheng Lu ^a ,
Qiang Zhao ^d ,
Runfeng Chen ^{b, *,} ,
Hong Yan ^{a, *,}

a.
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
b.
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
c.
Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
d.
College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
e.
A.N.Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, Moscow 119991, Russia

Received Date: 25 July 2024
Revised Date: 24 August 2024
Accepted Date: 29 September 2024
Available Online: 30 September 2024

Figures(7)

Thermally activated delayed fluorescence (TADF) materials driven by a through-space charge transfer (TSCT) mechanism have garnered wide interest. However, access of TSCT-TADF molecules with long-wavelength emission remains a formidable challenge. In this study, we introduce a novel V-type D-A-D-A' emitter, Trz-mCzCbCz, by using a carborane scaffold. This design strategically incorporates carbazole (Cz) and 2,4,6-triphenyl-1,3,5-triazine (Trz) as donor and acceptor moieties, respectively. Theoretical calculations alongside experimental validations affirm the typical TSCT-TADF characteristics of this luminogen. Owing to the unique structural and electronic attributes of carboranes, Trz-mCzCbCz exhibits an orange-red emission, markedly diverging from the traditional blue-to-green emissions observed in classical Cz and Trz-based TADF molecules. Moreover, bright emission in aggregates was observed for Trz-mCzCbCz with absolute photoluminescence quantum yield (PLQY) of up to 88.8%. As such, we have successfully fabricated five organic light-emitting diodes (OLEDs) by utilizing Trz-mCzCbCz as the emitting layer. It is important to note that both the reverse intersystem crossing process and the TADF properties are profoundly influenced by host materials. The fabricated OLED devices reached a maximum external quantum efficiency (EQE) of 12.7%, with an emission peak at 592 nm. This represents the highest recorded efficiency for TSCT-TADF OLEDs employing carborane derivatives as emitting layers.
- Thermally activated delayed fluorescence,
- Through-space charge transfer,
- Carborane,
- Boron clusters,
- Organic light-emitting diodes
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