Controlling the radiative rate of deep-blue electrophosphorescent organometallic complexes by singlet-triplet gap engineering

The phosphorescence radiative rate of electroluminescent metal complexes is controlled by the singlet-triplet splitting (Delta E-ST). The figure shows how the chemical tailoring of Delta E-ST influences the radiative rate in a new class of deep-blue emitting complexes. This approach holds promise for the preparation of efficient deep-blue OLEDs (see inset) for solid state lighting applications.