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Tetradentate Pt(II) 3,6-substitued salophen complexes: Synthesis and tuning emission from deep-red to near infrared by appending donor-acceptor framework

2017; Elsevier BV; Volume: 50; Linguagem: Inglês

10.1016/j.orgel.2017.08.006

1878-5530

You‐Ming Zhang, Zheng Yin, Fanyuan Meng, Junting Yu, Caifa You, Shengyi Yang, Hua Tan, Weiguo Zhu, Shi‐Jian Su,

Organic Electronics and Photovoltaics

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.