Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene
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Absorption induced by electrochemically injected holes is studied in poly-9,9-dioctylfluorene (PFO) films. Injected charges form positive polarons which are delocalised over four fluorene units in the glassy phase and about seven fluorene units in its beta-phase. Polaron absorption cross-sections at the 640 nm peak are similar to the published values of chemically reduced oligofluorenes in solution. The absorption cross-section of polaron in the beta-phase at 470 nm is about eight times smaller than the stimulated emission cross-section derived from published data. This indicates that beta-phase-rich PFO is an attractive candidate for a lightemitting layer in double-heterostructure organic laser diodes.
Montilla , F , Ruseckas , A & Samuel , I D W 2013 , ' Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene ' , Chemical Physics Letters , vol. 585 , pp. 133-137 . https://doi.org/10.1016/j.cplett.2013.08.098
Chemical Physics Letters
DescriptionF. Montilla acknowledges financial support provided by Ministerio de Economía y Competitividad (Ramón y Cajal RYC1463/06 and José Castillejo JC2009-00 227 Programs). The authors also acknowledge the Engineering and Physical Sciences Research Council for financial support.
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