Ning Su, Fanyuan Meng, Jianhua Chen
May 1, 2016
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Influential Citations
41
Citations
Journal
Dyes and Pigments
Abstract
Abstract Two novel near-infrared emitting binuclear platinum (II) complexes were successfully designed and synthesized with the bridged ancillary ligand of 3,5-dimethyl pyrazol, in which 2-(pyren-1-yl) pyridine and its derivative of 2-(7-( tert -butyl)pyren-1-yl)pyridine were used as cyclometalated ligands, respectively. Their photophysical, thermal, electrochemical, as well as electro-luminescent properties were investigated. The intrinsic near-infrared electro-luminescent spectra peaked at 692 nm with a shoulder at 753 nm was observed in the single-emissive-layer polymer light-emitting diodes using both binuclear platinum (II) complexes as the dopant. The tert -butyl group attached in pyrenyl ring was found to play an important role in improving electroluminescent properties. Better electroluminescent properties were obtained for the platinum complex with 2-(7-( tert -butyl)pyren-1-yl)pyridine in the devices with a maximum external quantum efficiency of 0.15% and a radiant intensity of 19.10 μW cm −2 . To our best knowledge, this is a first reported example on the near-infrared electroluminescence of binuclear platinum complex containing pyrazoline auxiliary ligand.