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Cyclometalated platinum(II) complexes with acyclic diaminocarbene ligands for OLED application. 2023

Svetlana A Katkova, and Daria O Kozina, and Kristina S Kisel, and Maria A Sandzhieva, and Dmitriy A Tarvanen, and Sergey V Makarov, and Vitaly V Porsev, and Sergey P Tunik, and Mikhail A Kinzhalov
St Petersburg University, 7/9 Universitetskaya Nab., Saint Petersburg, 199034, Russian Federation. sergey.tunik@spbu.ru.

A novel series of cyclometalated platinum(II) complexes bearing acyclic diaminocarbene (ADC) ancillary ligands were designed and prepared. Their photophysical properties were systematically studied through experimental and theoretical investigations. All complexes exhibit green phosphorescence with a quantum efficiency of up to 45% in 2 wt% doped PMMA film at room temperature. The complexes are used as light-emitting dopants for organic light-emitting diode (OLED) fabrication. The devices displayed a green emission with a maximum current efficiency of 2.9 cd A-1 and a luminance of 2700 cd m-2. These results show that these cyclometalated platinum(II) complexes can be used as efficient green emitting components of OLED devices.

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