A benzoindole-cored building block for deep blue fluorescent materials: synthesis, photophysical properties, and applications in organic light-emitting diodes

A new aromatic 2-(pyridine-4-yl)-3-phenyl-1H-benzo[g]indole core has been designed to build a series of D–π–A–π–D deep blue fluorescent materials in a Ψ-type configuration, which exhibit extremely stable efficiency curve at high luminance.