Absorption cross-sections of hole polarons in glassy and β-phase polyfluorene

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Title: Absorption cross-sections of hole polarons in glassy and β-phase polyfluorene
Authors: Montilla, Francisco | Ruseckas, Arvydas | Samuel, Ifor D.W.
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Absorption cross-sections | Hole polarons | Glassy | β-phase polyfluorene
Knowledge Area: Química Física
Issue Date: 14-Oct-2013
Publisher: Elsevier
Citation: Chemical Physics Letters. 2013, 585: 133-137. doi:10.1016/j.cplett.2013.08.098
Abstract: 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 β-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 β-phase at 470 nm is about eight times smaller than the stimulated emission cross-section derived from published data. This indicates that β-phase-rich PFO is an attractive candidate for a light-emitting layer in double-heterostructure organic laser diodes.
Sponsor: F. Montilla is grateful for financial support provided by Ministerio de Economía y Competitividad (Ramón y Cajal RYC1463/06 and José Castillejo JC2009-00227 Programs). We are also grateful to the Engineering and Physical Sciences Research Council for financial support.
URI: http://hdl.handle.net/10045/38687
ISSN: 0009-2614 (Print) | 1873-4448 (Online)
DOI: 10.1016/j.cplett.2013.08.098
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.cplett.2013.08.098
Appears in Collections:INV - GEPE - Artículos de Revistas

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