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Abstract
Dinuclear platinum(II) complexes of a new, ditopic, bis-tridentate NCN–NCN-coordinating ligand, appended with four mesityl groups, are reported. The high radiative rate constants and correspondingly efficient luminescence of the complexes involves thermally activated delayed fluorescence (TADF), thanks to a near-zero energy gap between the S1 and T1 states. The mesityl groups also serve to hinder the aggregation that was detrimental to electroluminescence efficiency in previous studies, allowing a ~4 fold increase in OLED efficiency to be achieved (i.e. from 2.3% previously to 10% in this work). Oxidation of one of the Pt(II) complexes led to a dinuclear Pt(IV) complex of unprecedented structure.
Supplementary materials
Title
Electronic supplementary information
Description
Synthetic details and characterisation of new materials; X-ray diffraction and crystal data; further information on the equipment and methods for theory, photophysical characterisation, and OLED devices.
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