Narrowband Fluorescent Emitters Based on BN-Doped Polycyclic Aromatic HydrocarbonsforEfficientand Stable Organic Light-emitting Diodes.

Abstract

Organic light-emitting diodes (OLEDs) using conventional fluorescent emitters are currently attracting considerable interests due to outstanding stability and abundant raw materials. To construct high-performance narrowband fluorophores to satisfy requirements of ultra-high-definition displays, a strategy fusing multi-resonance BN-doped moieties to naphthalene is proposed to construct two novel narrowband fluorophores.Green Na-sBN and red Na-dBN, manifest narrow full-width at half-maxima of 31 nm, near-unity photoluminescence quantum yields and molecular horizontal dipole ratios above 90%. Their OLEDs exhibit the state-of-the-art performances including high external quantum efficiencies (EQE), ultra-low efficiency roll-off and longoperational lifetimes. The Na-sBN-based device achieves EQE as high as 28.8% and remains 19.8% even at luminance of 100,000 cd m-2, and Na-dBN-based device acquires a record-high EQE of 25.2% among all red OLEDs using purefluorescent emitters.