Excited state absorption dynamics in metal cluster polymer [WS4Cu3I(4-bpy)3]n solution.
The nonlinear absorptive property of a novel metal cluster [WS(4)Cu(3)I(4-bpy)3]n in DMF solution is studied by using an open-aperture Z-scan technique with picosecond and nanosecond laser pulses at the wavelength of 532 nm. The experimental results show that the cluster has strong nonlinear absorption under the 8 ns pulse excitation and a relatively weak nonlinear absorptive property under the picosecond pulse excitation. The picosecond pump-probe response of the metal cluster is similar to that of C60 solution, which implies that the nonlinear mechanisms are the same for the two materials. By using the rate-equation model, the experimental data are theoretically simulated; several optical parameters of the cluster, especially the lifetime of the higher excited singlet state of the cluster, are obtained.
Yang
Junyi
J
School of Physical Science and Technology, Suzhou University, Suzhou 215006, P.R. China.
Gu
Jihua
J
Song
Yinglin
Y
Guang
Shi
S
Wang
Yuxiao
Y
Zhang
Wenhua
W
Lang
Jianping
J