Substituent effect of ancillary ligands on the luminescence of bis[4,6-(di-fluorophenyl)-pyridinato-N,C ~2′]iridium(iii) complexes

摘要

Two series of (dfppy) _2Ir(L _(N^O)) with different substituents were designed and successfully synthesized and the effect of substitution at the ancillary ligand on the photophysical and electrochemical properties of (dfppy) _2Ir(L _(N^O)) were investigated. The results indicate that the electron-donating group of -OMe at L _(N^O) increases the PL quantum efficiencies of (dfppy) _2Ir(L _(N^O)) and the electron-withdrawing groups of -CF _3 and -F lower the PL quantum efficiencies.