Deep-Blue Hot Exciton Emitters Approaching the BT.2020 Standard: Spiro-Fluoreno-Imidazole Acceptors with Twisted D-π-A Architectures.
Achieving deep-blue electroluminescence with high efficiency and color purity that meets the BT.2020 standard remains a major challenge for organic light-emitting diodes. Here, we report two D-π-A emitters, SFIA-1 and SFIA-2, based on a spiro-fluorene-imidazole acceptor (A) and a 10H-spiro(acridine-9,9'-fluorene) donor...