Origin investigation of High quantum yield Blue emission in 2-sulfonylfluorophenyl-substituted Heteroleptic Ir(III) Complex = Origin investigation of High quantum yield Blue emission in 2-sulfonylfluorophenyl-substituted Heteroleptic Ir(III) Complex

다국어 초록 (Multilingual Abstract)

In order to understand the intrinsic nature of nonradiative processes in heteroleptic cyclometalated Ir(III) complexes, highly phosphorescent Ir³⁺ complexes containing 2-(2-sulfonylfluorophenyl)pyridine (ppySO₂F) as the cyclometalated ligand were newly synthesized. Three ancillary ligands, acetylacetonate (acac), picolinate (pic), and tetrakis-pyrazolyl borate (bor), were employed for the preparation of the Ir(III) complexes [Ir(ppySO₂F)₂(acac)] (Ir-acac), [Ir(ppySO₂F)₂(pic)] (Ir-pic), and [Ir (ppySO₂F)₂(bor)] (Ir-bor). The molecular structures were characterized by X-ray crystallography. Blue phosphorescence maxima were observed at 458, 466, and 478 nm for Ir-bor, Ir-pic, and Ir-acac, respectively, at 77 K, and the corresponding emission quantum yields were determined to be 0.79, 0.80, and 0.98 in anaerobic CH₂Cl₂ at 300 K. Additionally, the phosphorescence decay times were measured to be 1.27, 2.11, and 3.58 μs for Ir-bor, Ir-pic, and Ir-acac, respectively.