Thermally Stable and Highly Luminescent Green Emissive Fluorophores with Acenaphtho[1,2‐k]fluoranthene Cores and Aromatic Amine Groups

Abstract

Four acenaphtho[1,2-k]fluoranthene-cored fluorophores 1-4 attached by a variety of N-containing electron-donating groups have been designed and synthesized. The appending N-containing moieties and the central acenaphtho[1,2-k]fluoranthene core form twisted molecular configurations and lead to separated HOMO and LUMO frontier molecular orbitals. X-ray crystallographic analysis demonstrates that the substituted aromatic amines separate the luminescent π-conjugated cores in the solid state. These compounds display excellent thermal and amorphous stabilities, high solid-state fluorescence quantum efficiencies, and ambipolar charge transporting properties, indicating that they are ideal candidates for fabricating non-doped organic light-emitting diodes (OLEDs). The device based on compound 4 exhibits the best electroluminescent performance with an external efficiency of 2.82 % and brightness of 45800 cd m-2 , demonstrating the potential applications of this compound for OLED displays and lighting.