Tuning emission wavelength and redox properties through position of the substituent in iridium(III) cyclometallated complexes.

Cyclometallated phenyls with substituents para to the metal have a larger impact on the redox potentials and emission of complexes [Ir(R-ppz)(2)(bipy)][PF(6)] than substituents at the meta position and hence enable tuning of emission wavelength over a wider range using the same substituent.