Blue electrophosphorescent organoplatinum(II) complexes with dianionic tetradentate bis(carbene) ligands

Robust charge-neutral Pt(II) complexes containing dianionic tetradentate bis(N-heterocyclic carbene) ligands exhibit intense blue phosphorescence in fluid solutions and in polymer films, and have been vacuum-deposited as a phosphorescent dopant in organic blue-light-emitting diodes.