Influence of the cyano-group on the optical properties of oligomeric PPV-derivatives

• Published in: Thin solid films Vol. 417; no. 1; pp. 26 - 31
• Main Authors: Hanack, M, Behnisch, B, Häckl, H, Martinez-Ruiz, P, Schweikart, K.-H
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 30.09.2002; Elsevier Science
• Subjects: Applied sciences; Distyrylbenzene; Electrical, magnetic and optical properties; Electroluminescence; Exact sciences and technology; Knoevenagel reaction; Organic polymers; Photoluminescence; Physicochemistry of polymers; PPV-derivatives; Properties and characterization; PPV-derivatives; Distyrylbenzene; Electroluminescence; Knoevenagel reaction; Photoluminescence; Substituent effect; Conjugated polymer; Optical properties; Phenylenevinylene derivative polymer; Experimental study; Oligomer
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/S0040-6090(02)00591-6

A series of oligomers analogous to poly( p-phenylenevinylene) (PPV 1) have been synthesized by various condensation reactions. Particular emphasis is placed upon the preparation of distyrylbenzenes with the electron-withdrawing cyano-group located in different positions of the conjugated system for comparison with the low band-gap polymer CN-PPV 2. Systematic variation of the location of the cyano-group allows us to tune the electronic as well as the optical properties. The electroluminescent behavior of the new emitting materials was studied in devices of the type ITO/copper phthalocyanine/oligomer/aluminium, showing a wide spectral range from blue–green to yellow, depending on the position of the cyano-group.