Characterization and emissive property of microfibers doped with fluorine functionalized iridium complex

In this paper, we used two fluorine-containing ligands of 2-(2-fluorophenyl)benzo[d]thiazole (F-BT) and 1,1,1,5,5,5-hexafluoropentane-2,4-dione (acac-F6) to construct an Ir complex of Ir(acac-F6)(F-BT)2. The single crystal of Ir(acac-F6)(F-BT)2 is observed, which confirms its identity. Ir(acac-F6)(F-BT)2 single crystal belongs to monoclinic system with two molecules in each unit cell. Theoretical calculation is performed on Ir(acac-F6)(F-BT)2 to investigate its electronic nature, which suggests that the first electronic transition owns a mixed character of metal-to-ligand-charge-transfer and ligand-to-ligand-charge-transfer. We select a polymer matrix of poly(vinylpyrrolidone) (PVP) to explore the photophysical property of Ir(acac-F6)(F-BT)2 within microfibers. Results indicate that the photophysical performances of Ir(acac-F6)(F-BT)2 within microfibers are improved compared with those of Ir(acac-F6)(F-BT)2 powder, including microfiber sampleʹs higher emission energy, longer excited state lifetime, and better photostability.