Organic Synthesis and Characteristics of Novel Conjugated Polymers with Cyano Group and Carbazole Unit for AMOLEDs

Abstract

The present investigation deals with the synthesis, characterization and EL of new copolymers, CzCNPFV1, CzCNPFV2 and CzCNPFV3 by Knoevenagel condensation reaction. The CzCNPFVs was synthesized for promoted efficiency of reported CNPFV. The PL emission spectra of the CzCNPFVs in chloroform solution show maximum peaks at 476 ~ 479 nm. In thin films, maximum peaks of the CzCNPFVs appeared at 501 ~ 504 nm, red-shifted around 25 nm as compared to that in solution. The more negative energy of the LUMO of CzCNPFV1 or CzCNPFV2 indicates the electron injection process is easier than in CNPFV. From this result, higher quantum efficiency of CzCNPFV1 or CzCNPFV2 as compared to that of CNPFV can be expected due to its improved electron injection ability from the cathode.