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 . DOI: 10.1016/j.cplett.2013.08.098
Chemical Physics Letters
© 2013, the Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
F. 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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