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

Two novel tetradentate platinum (II) complexes of Pt-2 and Pt-3 with 3,6-substitued salophen were synthesized and characterized. Their emission was efficiently tuned from deep red to near infrared by appending D-A framework of di(tert-butyl) triphenylamine (ButTPA) and benzothiadiazole (BT) into platinum (II) complexes under photo-excitation. A significant near infrared electroluminescence peaked at 703 nm with the maximum external quantum efficiency of 0.88% was obtained in the Pt-3 doped polymer light-emitting devices.250