Excited-state dynamics of thiophene thin films studied by time-resolved degenerate four-wave mixing
作者:
David Harris,
Roger Dorsinville,
Takeo Mukai,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 10
页码: 1216-1218
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.118276
出版商: AIP
数据来源: AIP
摘要:
The resonant nonlinear optical response and singlet excited-state dynamics in the thin film of polydithieno (3,2-b; 2′, 3′-d) thiophene are studied by time-resolved degenerate four-wave mixing. Our experimental results, using<1ps excitation at 635 nm, show that bimolecular decay via exciton–exciton annihilation dominates the temporal response at high intensities, thus decreasing the singlet lifetime. The measured rate constant of the singlet annihilation isk2=7.5×10−9cm3/s. Estimates of the singlet-singlet annihilation, exciton diffusion coefficient, and hopping rate are obtained from the measurements. ©1997 American Institute of Physics.
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