A Simple Design for Strongly Emissive Sky-Blue Phosphorescent Neutral Rhenium Complexes: Synthesis, Photophysics, and Electroluminescent Devices

A simple design strategy for a new class of stable, vacuum-sublimable, and strongly emissive sky-blue neutral phosphorescent Re­(I) phenanthroline complexes {Re­(R<sub>2</sub>phen)­(CO)<sub>3</sub>[CNB­(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]} is reported. These complexes show intense bluish green emission in CH<sub>2</sub>Cl<sub>2</sub> solution with the highest emission quantum yield and bluest emission ever reported for the neutral Re­(I) diimine complexes. In the solid state, they display sky-blue emission. The electroluminescent properties of devices containing these complexes have also been investigated.