We targeted the use of trimethylsilyl groups as structural dampeners. We designed a family of eight iridium complexes bearing trimethylsilyl substituents on either (or both) of the phenyl and pyridine rings of the cyclometallating ligands (Figure ). A naming scheme for the complexes was developed based on the substitution pattern of the trimethylsilyl groups, where each complex is identified by the location of the trimethylsilyl group on either the phenyl (C4/C5) and/or pyridine (N4/N5) ring. The introduction of trimethylsilyl groups into emissive iridium complexes has numerous benefits: their synthesis is facile, they increase the vapour pressure and thermal stability of the complex, and they can improve the solubility of the complex. 19