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Aggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%
Yang, Hu1; Zheng, Ji1; Xie, Mo1; Luo, Dong1; Tang, Wen Jing1; Peng, Su Kao1; Cheng, Gang2,3; Zhang, Xuanjun4; Zhou, Xiao Ping1; Che, Chi Ming2,3; Li, Dan1
Source PublicationACS Materials Letters

It is a significant challenge to achieve a high photoluminescence quantum yield of Cu(I) complexes, particularly for red Cu(I) emitters, because of their considerable reorganization energy and weak spin-orbit coupling. Herein, we report a red phosphorescent cyclic trinuclear Cu(I) complex (denoted as 1), which was formed by reacting alkyl-substituted pyrazole ligands (4-isobutyl-3,5-dimethyl-1H-pyrazole) with in situ generated Cu(I) ions. Complex 1 was nonemissive in a pure tetrahydrofuran (THF) solution, whereas it emitted intense red light when its molecules were aggregated by adding water to the THF solution. Near-unity photoluminescence quantum yields were achieved in a mixed solvent of THF/water (f= vol/vol, f= 90%), poly(methyl methacrylate) films, and in the solid state. Photophysical analysis and theoretical calculations revealed that the excellent photoluminescence performance was due to the aggregation-enhanced emission. In the aggregation state, cuprophilic interactions dominated the excited state, and the restricted movement of alkyl through CH···C/CH···πinteractions diminished nonradiative transition. A cyclic trinuclear Cu(I) complex was used to fabricate a nondoped organic light-emitting diode (OLED), which is the first instance of such Cu(I) materials.

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Indexed BySCIE
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000875149200001
Scopus ID2-s2.0-85137867533
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Document TypeJournal article
CollectionFaculty of Health Sciences
Affiliation1.College of Chemistry and Materials Science, Guangdong Prov. Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou, Guangdong, 510632, China
2.State Key Laboratory of Synthetic Chemistry, HKU-CAS, Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Hong Kong, 999077, Hong Kong
3.HKU, Shenzhen Institute of Research and Innovation, Shenzhen, 518053, China
4.Cancer Centre and Centre of Reproduction Development and Aging, Faculty of Health Sciences, University of Macau, 999078, Macao
Recommended Citation
GB/T 7714
Yang, Hu,Zheng, Ji,Xie, Mo,et al. Aggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%[J]. ACS Materials Letters,2022,4(10):1921-1928.
APA Yang, Hu,Zheng, Ji,Xie, Mo,Luo, Dong,Tang, Wen Jing,Peng, Su Kao,Cheng, Gang,Zhang, Xuanjun,Zhou, Xiao Ping,Che, Chi Ming,&Li, Dan.(2022).Aggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%.ACS Materials Letters,4(10),1921-1928.
MLA Yang, Hu,et al."Aggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%".ACS Materials Letters 4.10(2022):1921-1928.
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