Narrowband Fluorescent Emitters Based on BN-Doped Polycyclic Aromatic Hydrocarbons for Efficient and Stable Organic Light-Emitting Diodes

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 long operational 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 pure fluorescent emitters.

Automated summary

Organic light-emitting diodes (OLEDs) using conventional fluorescent emitters are currently attracting considerable interest due to their stability and abundant raw materials. A new strategy has been proposed to construct high-performance narrowband fluorophores for ultra-high-definition displays. By fusing multi-resonance BN-doped moieties to naphthalene, two novel narrowband fluorophores have been successfully constructed. These fluorophores exhibit narrow full-width at half-maxima, high photoluminescence quantum yields, and high molecular horizontal dipole ratios. The corresponding OLED devices show state-of-the-art performances, including high external quantum efficiencies, low efficiency roll-off, and long operational lifetimes.