Two-photon excited transient absorption in poly(9,9'-dioctylfluorene-<i>co</i>-N-(4-butylphenyl)diphenylamine)

Xinping Zhang; Yajun Xia; Carlos Silva; Richard H. Friend

doi:10.1117/12.693420

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10 June 2006 Two-photon excited transient absorption in poly(9,9'-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)

Xinping Zhang, Yajun Xia, Carlos Silva, Richard H. Friend

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Proceedings Volume 6344, Advanced Laser Technologies 2005; 634406 (2006) https://doi.org/10.1117/12.693420
Event: Advanced Laser Technologies 2005, 2005, Tianjin, China

Abstract

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 1A_g to mA_g via absorbing one pump and one probe photon and a further transition from mA_g to nB_u state due to the pump-induced transient population on mA_g. A long-lived slow process following the rapid one is interpreted as a combination of 1B_u absorption for transitions to a higher-lying state of kA_g 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); https://doi.org/10.1117/12.693420

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