![]() ![]() ![]() The OLED devices were fabricated through a vapor deposition process utilizing complexes 2a and 4a as emitting materials. All five complexes exhibited phosphorescence, with complex 1a emitting at 534 nm with Φ = 5%, τ = 3.17 μs, 2a emitting at 530 nm with Φ = 21%, τ = 2.48 μs, 3a emitting at 581 nm with Φ = 25%, τ = 7.48 μs, 4a emitting at 586 nm with Φ = 38%, τ = 2.32 μs, and 1b emitting at 573 nm with Φ = 5%, τ = 1.44 μs in 2 wt% polymethyl methacrylate (PMMA) films. Moreover, TD-DFT calculations were performed to investigate the triplet emission nature of the complexes. ![]() All five complexes were characterized using NMR, HR-MS, elemental analysis, CV, TGA, and single-crystal X-ray diffraction, except for 2a, for which a single crystal was not obtained. Four mononuclear platinum( II) complexes, Pt(TBPCH)(acac) 1a, Pt(TBPCH)(dpmn) 2a, Pt(TBPCH)(dbmn) 3a, and Pt(TBPCH)(dnmn) 4a, and one binuclear Pt( II) complex, Pt 2(TBPC)(acac) 2 1b, where TBPCH 2 = 3,6-di- tert-butyl-9-(pyrimidin-2-yl)-9 H-carbazole, acac = acetylacetonate, dpmn = dipivaloylmethanate, dbmn = dibenzoylmethanate, and dnmn = di(2-naphthoyl)methanate, have been prepared by utilizing TBPCH 2 (C^N) as the primary ligand and acetylacetonate derivatives (O^O) as the ancillary ligands. ![]()
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