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10 June 2006 Two-photon excited transient absorption in poly(9,9'-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)
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Proceedings Volume 6344, Advanced Laser Technologies 2005; 634406 (2006)
Event: Advanced Laser Technologies 2005, 2005, Tianjin, China
We investigate femtosecond transient absorption in the visible range in a solution sample of poly(9,9'-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine), TFB, using two-photon excitation at 800 nm (1.55 eV). A rapid probe absorbing process taking place within the temporal overlap between the pump and probe pulses was observed in the whole visible spectral range (430 nm to 700 nm), which resulted from the combination of a transition from 1Ag to mAg via absorbing one pump and one probe photon and a further transition from mAg to nBu state due to the pump-induced transient population on mAg. A long-lived slow process following the rapid one is interpreted as a combination of 1Bu absorption for transitions to a higher-lying state of kAg and charge absorption. These excitation and absorption channels, as well as the mechanisms of charge separation, were resolved and evaluated quantitatively by the pump-intensity dependence of the transient absorption dynamics.
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Xinping Zhang, Yajun Xia, Carlos Silva, and Richard H. Friend "Two-photon excited transient absorption in poly(9,9'-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)", Proc. SPIE 6344, Advanced Laser Technologies 2005, 634406 (10 June 2006);

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