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Proceedings Paper

Thermal and disorder broadening of excited states in polydiacetylene: 4BCMU
Author(s): Gerhard Weiser; S. Moeller; A. Horvath; Claudette Lapersonne-Meyer; Michel Schott
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Paper Abstract

We present a study of the temperature dependence of absorption and electroabsorption spectra of a thin polydiacetylene single crystal 4BCMU poly[1,7 dodecadiyine- 1,12 diol-bis (4-butoxy carbonyl methyl urethane)] up to 450 K. Comparison with spectra of single chains diluted in a monomer single crystal reveals that the polymerization induces strong inhomogeneous broadening leading to two types of chains with exciton transition energies at 2 eV and 2.3 eV, respectively. Chains with transition energy at 2 eV transform into the other species near 380 K. The Stark effect of the excitons remains unchanged until the crystal is heated to 450 K where the spectra transform into the shape observed in spin cast films. These changes of the spectra are discussed in relation to the increasing disorder in the sample.

Paper Details

Date Published: 1 December 1997
PDF: 11 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.279292
Show Author Affiliations
Gerhard Weiser, Philipps-Univ. Marburg (Germany)
S. Moeller, Philipps-Univ. Marburg (Germany)
A. Horvath, Philipps-Univ. Marburg (Germany)
Claudette Lapersonne-Meyer, Univ. de Paris VI--Pierre et Marie Curie (France) and Univ. de Paris VII--Denis Diderot (France)
Michel Schott, Univ. de Paris VI--Pierre et Marie Curie (France) and Univ. de Paris VII--Denis Diderot (France)

Published in SPIE Proceedings Vol. 3145:
Optical Probes of Conjugated Polymers
Z. Valy Vardeny; Lewis J. Rothberg, Editor(s)

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