A series of dinuclear cuprous iodide complexes chelated with 1,2-bis(diphenylphosphino) benzene derivatives: structural, photophysical and thermal properties

摘要

Three new bisphosphine ligands, 4-phenyl-1,2-bis.diphenylphosphino) benzene (Ph-dppb), 4-pyrrolyl-1,2bis(diphenylphosphino) benzene (Pr-dppb), and 4,5-dimethoxyl-1,2-bis.diphenylphosphino) benzene (OMe-dppb), were synthesized to coordinate with cuprous iodide (CuI), and compared with 1,2bis(diphenylphosphino) benzene (dppb). Single crystal X-ray diffraction and elemental analysis experiments indicate that three binuclear CuI complexes with formulae of [Cu(mu(2)-I)Ph-dppb](2), [Cu(mu(2)-I)Pr-dppb](2), and [Cu(mu(2)-I)OMe-dppb](2) were obtained, which are the same as the reference complex [Cu(mu(2)-I)dppb](2). The three complexes showed a maximum emission band (lambda(max)) in the range of 484-535 nm which varies in the electron effect of the substituted groups (i.e. methoxy, pyrrolyl, phenyl) on [Cu(mu(2)-I)dppb](2), and in high photoluminescence quantum yield (PLQY) from 53 to 90% in the solid state. Furthermore, the complexes [Cu(mu(2)-I)Ph-dppb](2) and [Cu(mu(2)-I)Pr-dppb](2) exhibited a thermal decomposition temperature exceeding 380 degrees C. The high PLQY and excellent thermal stability of these CuI complexes imply their great potential application as efficient emitters in organic light-emitting diodes (OLEDs).