Tetradentate Pt(II) 3,6-substitued salophen complexes: Synthesis and tuning emission from deep-red to near infrared by appending donor-acceptor framework |
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| Affiliation: | 1. Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Department of Materials Chemistry, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;2. College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan 411105, China;3. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China;4. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;1. Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, 682 022, Kerala, India;2. Department of Chemistry, Faculty of Science, Eastern University, Chenkalady, Sri Lanka;1. Universidade Federal de São Carlos, Departamento de Física, São Carlos, SP 13565-905, Brazil;2. Universidade Federal do Paraná, Setor Litoral, Matinhos, PR 83260-000, Brazil;3. Universidade Regional do Cariri, Departamento de Física, 63010-970, Brazil;4. Universidade Federal do Ceará, Departamento de Física, 60455-760, Brazil;1. Chemistry Institute, University of Campinas – UNICAMP, Campinas, Brazil;2. Center for Information Technology Renato Archer – CTI, Campinas, Brazil;3. Department of Chemistry, Federal University of São Paulo – UNIFESP, São José dos Campos, Brazil;4. Department of Chemistry, Exact Science Institute, Federal University of Juiz de Fora – UFJF, Juiz de Fora, Brazil |
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| Abstract: | Two novel tetradentate platinum (II) 3,6-substituted salophen complexes of Pt-2 and Pt-3 were synthesized and characterized, in which the substituted group is a donor (D) unit of 4,4′-di(tert-butyl)triphenylamine (ButTPA) for Pt-2 and a donor-acceptor (D-A) framework of ButTPA and benzothiadiazole (BT) for Pt-3. Their thermal, optophysical, electrochemical and electroluminescent properties were primarily investigated. It is found that the emission for this type of tetradentate platinum (II) complexes is tuned from deep red to near infrared by appending D-A framework under photo-excitation. As a result, Pt-3 presented a significant near infrared electroluminescence peaked at 703 nm in its doped polymer light-emitting devices (PLEDs). The maximum external quantum efficiency of 0.88% is observed in the Pt-3 doped PLEDs using a blend of poly(vinylcarbazole) and 1,3-bis(5-(4-(tert-butyl)phenyl)-1,3,4-oxadiazol-2-yl) benzene as the host matrix. Our work indicates that appending D-A framework into tetradentate Pt(II) salophen complex is a useful strategy to get high-performance near infrared emission for this type of tetradentate Pt (II) complexes. |
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| Keywords: | Pt(II) 3,6-substituted salophen complexes Donor-accepter framework Synthesis Near-infrared emission Electroluminescence |
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