Amine groups-functionalized alcohol-soluble polyfluorene derivatives:Synthesis, photophysical properties, and self-assembly behaviors

摘要

A polyfluorene derivative with primary amine groups on side chains, poly(9,9-bis(6'-aminohexyl)fluorene)(PF-NH_2),was prepared through de-protection of its analogue polymer poly(9,9-bis(6'-butoxyl-carbonylaminohexyl)fluorene) (PF-BOC) with hydrochloric acid followed by neutralizing the salt form ofpoly(6,6'-(9H-fluorene-9,9-diyl)dihexan-1-aminium chloride) (PF-NION). PF-NION had good solubility inmethanol, DMSO, and DMF. Scanning electron microscopic images of PF-NH_2in thin films revealed thatintramolecular/intermolecular hydrogen bonding and π-π stacking interactions probably played animportant role in the formation of special surface morphologies, which might be beneficial to themolecular ordering and device fabrication. The electroluminescence property of PF-NION was recorded ona simple polymer light-emitting diode (PLED) device configuration of ITO/PEDOT/Polymer/Al. Pure blueelectroluminescence is achieved from double-layer PLEDs based on PF-NION as the active material withthe CIE of (0.16, 0.08).