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Proceedings Paper

Poly(1-vinylindole) and some of its methyl derivatives as substrates for photorefractive materials: their synthesis, optical, and electrical characterization
Author(s): Arturo Colligiani; Fiorella Brustolin; Valter Castelvetro; Francesco Ciardelli; Giacomo Ruggeri
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Paper Abstract

The best conditions for the synthesis of poly(1-vinylindole) (PVI) and some of its methyl derivatives have been investigated. The aim of the research was to verify if PVI could be used instead of poly(1- vinylcarbazole) (PVK) in polymeric blends having photoconductive and/or photorefractive behavior. All synthesized polymers are characterized by a glass transition temperature that is lower than that of PVK. It has been verified that the indole ring system, inclusive of its methyl substituted derivatives, lacking of the symmetry characteristics of carbazole, possesses an electric dipole moment that is constantly higher than that of PVK. A higher dipole moment can be an advantageous feature to improve the solubility within the polymetric matrix of the optically non-linear molecule, necessary for photorefractivity. Charge-transfer complexes with a fluorenone-like photosensitizer are efficiently formed by both PVI and its derivatives. A direct current measuring apparatus has been assembled by which photocurrents of few picoamperes can be detected and recorded. Preliminary reported results clearly show that PVI is a photoconductive material. Its photoconductivity is compared with that of PVK and of hybrid materials containing mixtures of carbazole and indole moieties, present in the measuring cell as pendant groups on a macromolecular chain, as single molecules, or both.

Paper Details

Date Published: 13 November 2000
PDF: 7 pages
Proc. SPIE 4104, Organic Photorefractives, Photoreceptors, and Nanocomposites, (13 November 2000); doi: 10.1117/12.406469
Show Author Affiliations
Arturo Colligiani, Univ. degli Studi di Napoli Federico II (Italy) and INFM/Univ. di Pisa (Italy)
Fiorella Brustolin, Univ. di Pisa (Italy)
Valter Castelvetro, Univ. di Pisa (Italy)
Francesco Ciardelli, Univ. di Pisa (Italy)
Giacomo Ruggeri, Univ. di Pisa (Italy)

Published in SPIE Proceedings Vol. 4104:
Organic Photorefractives, Photoreceptors, and Nanocomposites
Keith L. Lewis; Klaus Meerholz; Klaus Meerholz, Editor(s)

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