Synthesis, physical and electroluminescence properties of 3,6-dipyrenylcarbazole end capped oligofluorenes

Abstract

A series of oligofluorenes bearing two 3,6-dipyrenylcarbazole units as the terminal substituents, namely BPCFn (n = 1–3), were successfully synthesized and characterized as non-doped hole-transporting blue emitters. These molecules showed strong blue emission with good solubility, and thermally stable amorphous and excellent film-forming properties. OLEDs using these materials as the emissive layers were fabricated by a simple solution spin-coating process. The blue OLED with excellent device performance (brightness of 6085 cd m⁻², luminance efficiency of 4.13 cd A⁻¹ and turn-on voltage of 3.4 V) was attained from BPCF3.