Boron–nitrogen framework substituted anthracenes as “hot exciton” fluorophores for efficient sky-blue narrowband emissive OLEDs with full-width at half-maximum below 30 nm

Narrowband emissive fluorophores are designed and synthesized by combining multiple-resonance chromophore and anthracene units, which also exhibit capability to rapidly convert triplet excitons into singlet excitons via high-lying reverse intersystem crossing.