Ultrafast excitation cross-correlation photoconductivity in polyfluorene photodiodes

Gambetta, A.; Virgili, T.; Lanzani, G.
June 2005
Applied Physics Letters;6/20/2005, Vol. 86 Issue 25, p253509
Academic Journal
Two-pulse excitation cross-correlation photocurrent is measured in single-layer poly(9,9 dioctylfluorene) light-emitting diodes. Off-resonant pulses show a three-photon resonance to a higher lying state responsible for charge generation, mediated by some low-lying excited singlet state S2 (of even symmetry). Resonant excitation shows a two-step transition to the charge generation states mediated by a vibrationally hot S1 state (of odd symmetry) which introduces an ultrafast timescale suitable for application. Basic knowledge on charge generation and excited state relaxation is obtained. Possible application to pulse characterization in the blue spectral region is also demonstrated.


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