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Accumulation of electric-field-stabilized geminate polaron pairs in an organic semiconductor to attain high excitation density under low intensity pumping
2006
Applied Physics Letters
The recombination dynamics of geminate polaron pair ͑PP͒ states are investigated by monitoring electric-field-induced delayed fluorescence in thin films consisting of the green laser dye, Coumarin-6 ͑C6͒ doped at 1 wt % into 4 , 4Ј-bis͑N-carbazolyl͒biphenyl. We find that the PP decay follows −m ͑with m ϳ 0.1͒, where is the time that the PPs are held in the field. This sublinear decay suggests the possibility for accumulation of PPs over time that can then be reconverted into excitons upon field
doi:10.1063/1.2385840
fatcat:u6kytmb3nnekflw2q3ngd5p4x4