Synthesis, Characterization and Optoelectronic Properties of Oligo(p-Phenylenvinylidenequinolines) with Different Substituents

Abstract

2,2'–(2,5-bisoctyloxy-1,4-phenylenvinylidene)bis-8-acetoxyquinoline (TrimQ1), 2,2’-(2,5-bisoctyloxy-1,4-phenylendivinylene)bis-6-bromoquinoline (TrimQ2) 2,2'–(2,5-bisoctyloxy-1,4-phenylendivinylene)bis(8-acetoxy-5,7-dichloro)quinoline(TrimQ3), were synthesized and characterized by different spectroscopic methods. The fluorescent properties of these bisphenylenvinylenquinoline oligomers were analyzed by fluorescence spectroscopy and then the quantum yields were calculated. The order of light emitting properties: (TrimQ3) (quantum yield, 75%) > (TrimQ2) (quantum yield, 21% ) > (TrimQ1) (quantum yield, 5%), showing that TrimQ3 is more suitable for OLED construction than other compounds. Thin films were prepared by spin coating from concentrated solutions of the compounds using a polystyrene (PS) matrix on glass. Prototypes of diodes were fabricated using ITO/organic film/In-Ga a configuration. For all the devices, electroluminescence properties also were analyzed through applying a voltage larger than 8 V and a current of 4 mA.