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Proceedings Paper

Ultrafast conformational readjustment in hexamethylsexithiophene oligomer studied by femtosecond time-resolved photoluminescence
Author(s): Kam Sing Wong; H. Wang; Guglielmo Lanzani
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Paper Abstract

The ultrafast excited state dynamics of Hexamethylsexithiophene are investigated by femtosecond time-resolved photoluminescence. The spontaneous recombination lifetime of the singlet excited state is measured to be in the order of 400 ps. A photoluminescence (PL) risetime of approximately 1 ps and temporal spectra redshift is observed. These effects are attributed to planarization of the oligomer backbone in the excited state via vibrational and torsional relaxation which increases the effective conjugation length of the oligomer. The rapid vibrational and torsional relaxation gave rise to the PL risetime. The change in oligomer bandgap energy due to a longer effective conjugation length which is manifested in the transient spectral redshift.

Paper Details

Date Published: 1 December 1997
PDF: 7 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.279271
Show Author Affiliations
Kam Sing Wong, Hong Kong Univ. of Science and Technology (Hong Kong)
H. Wang, Hong Kong Univ. of Science and Technology (Hong Kong)
Guglielmo Lanzani, Univ. degli Studi di Sassari (Italy)

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

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