Synthesis and optical properties of a series of pyrrolopyridazine derivatives: deep blue organic luminophors for electroluminescent devices

We describe a systematic study of a series of eight blue light-emitting molecules which can be prepared in one step from inexpensive commercial starting materials. The relative luminescence quantum yield can be as high as 84% and the heterocycles are luminescent in the condensed state, either as solids or as oils, indicating that there is no self-quenching in this system. The last observation augurs well for these heterocycles being useful in the fabrication of deep blue light-emitting devices.