Discrete Conjugated Poly(arylene ether) Compounds for Blue Emission Electroluminescent Devices

Conjugated polymers with discrete units have received attention for their potential applications in molecular electronics and photonics. This study, a series of fluorinated carbazole derivatives of a discrete conjugated main chain, which integrated anthracene and pyrene groups, was reported. Three polymers, namely PCzAn, PCzBAn, and PCzPy, were designed and synthesized through Suzuki and poly coupling reactions, and the conjugation of the geometry of these materials was investigated. These molecules were characterized using 1H nuclear magnetic resonance, Fourier transform infrared (FTIR) spectroscopy, gel permeation chromatography (GPC)-mass spectrometry, PL spectrum, absorption spectrum, PLQY, and solution-processed for OLEDs. All materials showed remarkable thermal stability and excellent quantum efficiency. In the emitting layer, the blending of PCzBAn:PVK (8:2) exhibited excellent luminance efficiency and external quantum efficiency of 4.87 cd/A and 2.89%, respectively.