Abstract
Two novel tetradentate platinum (II) salophen complexes A and B, respectively substituted by dual donor-accepter frameworks of phenazine-triphenylamine in the heads and waists of salophen, were synthesized and characterized. By changing the substituted positions of dual phenazine-triphenylamine units, different optophysical, electrochemical and electroluminescent properties were remarkably observed for the both platinum (II) salophen complexes. Using a blend of poly(vinyl-carbazole) (PVK) and 1,3-bis(5-(4-(tert-butyl) phenyl)-1,3,4-oxadiazol-2-yl)benzene (OXD-7) as host matrix, the platinum (II) salophen complexes A and B exhibited a deep red emission at 653 nm and a near-infrared (NIR) emission at 695 nm in the single-emissive-layer polymer light-emitting devices, respectively. The maximum external quantum efficiency (EQE) of 1.36% and highest radiant intensity (R) of 45 μW cm−2 were obtained in the complex B-doped devices, which are 13.6 and 2.6 times of those corresponding values in the complex A-doped devices. It indicates that appending dual donor-accepter frameworks in the heads of salophen is an efficient strategy to achieve NIR emission for their tetradentate platinum (II) complexes.
Published Version
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