ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Thermochromism and optical absorption in mono- and multilayers of Langmuir–Blodgett films of poly(3-alkylthiophenes), poly(3-octyl-2,2'-bithiophene), and poly(3'-octyl-2,2';5',2‘-terthiophene) were studied. In sparsely alkylated polythiophenes the magnitude of the thermochromic shift was smaller than in poly(3-alkylthiophenes) and roughly proportional to the sidechain concentration. Results of Valence Effective Hamiltonian calculations were compared with the experimental results of thermochromism. A vibronic structure was found in the absorption spectra of Langmuir–Blodgett films at room temperature. The vibronic splitting in poly(3-hexylthiophene) was approximately 0.18 eV as previously has been observed in poly(3-alkylthiophenes) but in poly(3'-octyl-2,2';5',2‘-terthiophene) it was 0.20–0.25 eV. The vibronic peaks stay approximately at constant energies and vanish at elevated temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.357766
