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

Francisco Montilla; Arvydas Ruseckas; Ifor David William Samuel

doi:10.1016/j.cplett.2013.08.098

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

Francisco Montilla^*, Arvydas Ruseckas, Ifor David William Samuel

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 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.

Original language	English
Pages (from-to)	133-137
Number of pages	5
Journal	Chemical Physics Letters
Volume	585
DOIs	https://doi.org/10.1016/j.cplett.2013.08.098
Publication status	Published - 14 Oct 2013

Keywords

Conjugated polymer
Films
Fluorescence
Photophysics
Morphology

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10.1016/j.cplett.2013.08.098

CPL2013
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title = "Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene",

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 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.",

keywords = "Conjugated polymer, Films, Fluorescence, Photophysics, Morphology",

author = "Francisco Montilla and Arvydas Ruseckas and Samuel, {Ifor David William}",

note = "F. Montilla acknowledges financial support provided by Ministerio de Econom{\'i}a y Competitividad (Ram{\'o}n y Cajal RYC1463/06 and Jos{\'e} Castillejo JC2009-00 227 Programs). The authors also acknowledge the Engineering and Physical Sciences Research Council for financial support.",

year = "2013",

month = oct,

day = "14",

doi = "10.1016/j.cplett.2013.08.098",

language = "English",

volume = "585",

pages = "133--137",

journal = "Chemical Physics Letters",

issn = "0009-2614",

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TY - JOUR

T1 - Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene

AU - Montilla, Francisco

AU - Ruseckas, Arvydas

AU - Samuel, Ifor David William

N1 - 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.

PY - 2013/10/14

Y1 - 2013/10/14

N2 - 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.

AB - 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.

KW - Conjugated polymer

KW - Films

KW - Fluorescence

KW - Photophysics

KW - Morphology

U2 - 10.1016/j.cplett.2013.08.098

DO - 10.1016/j.cplett.2013.08.098

M3 - Article

SN - 0009-2614

VL - 585

SP - 133

EP - 137

JO - Chemical Physics Letters

JF - Chemical Physics Letters

ER -

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

Abstract

Keywords

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