Abstract
A series of heteroleptic cyclometalated platinum(II) complexes based on a 4- (Pt-1) and 5-substituted (Pt-2) cyclometalated ligand were prepared, and their photoluminescence (PL) and electroluminescence (EL) properties were investigated. In dichloromethane, the complexes bearing a fluoro (Pt-1a and Pt-2a) or a methyl (Pt-1b and Pt-2b) substituent exhibited green PL, whereas a trifluoromethyl substituent induced a red shift, affording yellow PL (Pt-1c and Pt-2c). For poly(methyl methacrylate) thin films doped with Pt-1a–c, higher PL quantum yields were obtained in comparison with the solution samples. Polymer light-emitting diodes (PLEDs) containing the platinum(II) complexes were fabricated, and the devices doped with Pt-1b and Pt-2b showed relatively high external quantum efficiencies. PLEDs doped with varying concentrations of Pt-1b were also fabricated, where generation of excimer-based EL led to significant shifts of the Commision Internationale de L'Eclairage chromaticity coordinate from (0.40, 0.56) (green) to (0.51, 0.48) (orange) with the device efficiency almost constant.
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