Highly anisotropic luminescence from poly(9,9-dioctylfluorene) nanowires doped with orientationally ordered β-phase polymer chains

Deirdre M O'Carroll, Gareth Redmond

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We quantitatively assess the nature and extent of emissive polymer chain organization within individual poly(9,9-dioctylfluorene) nanowires fabricated by solution-assisted template wetting. A minority fraction of planar, extended β-phase polymer chains occurs within the nanowires, which dominates their luminescence behavior. Nanowires exhibit pronounced optical birefringence and detailed polarized optical microscopy analysis indicates preferential axial alignment of polymer chains. Polarization-resolved near-field photoluminescence imaging and spectroscopy methods are employed to probe local spatial variations in light emission intensity along individual nanowires. Data indicate strong axially polarized nanowire emission, with locally measured dichroic ratios up to 8.9, consistent with preferential axial alignment of emissive β-phase polymer chains. To visualize the extent of β-phase chain alignment within a typical nanowire, we generated image maps of the orientational order parameter, 〈P2〉, from measured near-field emission intensity image data. Numerous domains of long-range order up to 2 μm in size with 〈P2〉 values ranging from 0.47 to 0.76 are identified, indicating extensive axial alignment of emissive β-phase chains within the nanowires. Poly(9,9-dioctylfluorene) nanowires exhibiting micrometer-scale order make them attractive elements for future subwavelength organic opto-electronic devices.

Original languageEnglish
Pages (from-to)6501-6508
Number of pages8
JournalChemistry of Materials
Volume20
Issue number20
DOIs
Publication statusPublished - Oct 28 2008

Fingerprint

Nanowires
Luminescence
Polymers
Light emission
Birefringence
Field emission
Optoelectronic devices
Optical microscopy
Wetting
Photoluminescence
Spectroscopy
Polarization
Imaging techniques

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Highly anisotropic luminescence from poly(9,9-dioctylfluorene) nanowires doped with orientationally ordered β-phase polymer chains. / O'Carroll, Deirdre M; Redmond, Gareth.

In: Chemistry of Materials, Vol. 20, No. 20, 28.10.2008, p. 6501-6508.

Research output: Contribution to journalArticle

@article{09e2b344e45746859a1d071a24811471,
title = "Highly anisotropic luminescence from poly(9,9-dioctylfluorene) nanowires doped with orientationally ordered β-phase polymer chains",
abstract = "We quantitatively assess the nature and extent of emissive polymer chain organization within individual poly(9,9-dioctylfluorene) nanowires fabricated by solution-assisted template wetting. A minority fraction of planar, extended β-phase polymer chains occurs within the nanowires, which dominates their luminescence behavior. Nanowires exhibit pronounced optical birefringence and detailed polarized optical microscopy analysis indicates preferential axial alignment of polymer chains. Polarization-resolved near-field photoluminescence imaging and spectroscopy methods are employed to probe local spatial variations in light emission intensity along individual nanowires. Data indicate strong axially polarized nanowire emission, with locally measured dichroic ratios up to 8.9, consistent with preferential axial alignment of emissive β-phase polymer chains. To visualize the extent of β-phase chain alignment within a typical nanowire, we generated image maps of the orientational order parameter, 〈P2〉, from measured near-field emission intensity image data. Numerous domains of long-range order up to 2 μm in size with 〈P2〉 values ranging from 0.47 to 0.76 are identified, indicating extensive axial alignment of emissive β-phase chains within the nanowires. Poly(9,9-dioctylfluorene) nanowires exhibiting micrometer-scale order make them attractive elements for future subwavelength organic opto-electronic devices.",
author = "O'Carroll, {Deirdre M} and Gareth Redmond",
year = "2008",
month = "10",
day = "28",
doi = "10.1021/cm8015534",
language = "English",
volume = "20",
pages = "6501--6508",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "20",

}

TY - JOUR

T1 - Highly anisotropic luminescence from poly(9,9-dioctylfluorene) nanowires doped with orientationally ordered β-phase polymer chains

AU - O'Carroll, Deirdre M

AU - Redmond, Gareth

PY - 2008/10/28

Y1 - 2008/10/28

N2 - We quantitatively assess the nature and extent of emissive polymer chain organization within individual poly(9,9-dioctylfluorene) nanowires fabricated by solution-assisted template wetting. A minority fraction of planar, extended β-phase polymer chains occurs within the nanowires, which dominates their luminescence behavior. Nanowires exhibit pronounced optical birefringence and detailed polarized optical microscopy analysis indicates preferential axial alignment of polymer chains. Polarization-resolved near-field photoluminescence imaging and spectroscopy methods are employed to probe local spatial variations in light emission intensity along individual nanowires. Data indicate strong axially polarized nanowire emission, with locally measured dichroic ratios up to 8.9, consistent with preferential axial alignment of emissive β-phase polymer chains. To visualize the extent of β-phase chain alignment within a typical nanowire, we generated image maps of the orientational order parameter, 〈P2〉, from measured near-field emission intensity image data. Numerous domains of long-range order up to 2 μm in size with 〈P2〉 values ranging from 0.47 to 0.76 are identified, indicating extensive axial alignment of emissive β-phase chains within the nanowires. Poly(9,9-dioctylfluorene) nanowires exhibiting micrometer-scale order make them attractive elements for future subwavelength organic opto-electronic devices.

AB - We quantitatively assess the nature and extent of emissive polymer chain organization within individual poly(9,9-dioctylfluorene) nanowires fabricated by solution-assisted template wetting. A minority fraction of planar, extended β-phase polymer chains occurs within the nanowires, which dominates their luminescence behavior. Nanowires exhibit pronounced optical birefringence and detailed polarized optical microscopy analysis indicates preferential axial alignment of polymer chains. Polarization-resolved near-field photoluminescence imaging and spectroscopy methods are employed to probe local spatial variations in light emission intensity along individual nanowires. Data indicate strong axially polarized nanowire emission, with locally measured dichroic ratios up to 8.9, consistent with preferential axial alignment of emissive β-phase polymer chains. To visualize the extent of β-phase chain alignment within a typical nanowire, we generated image maps of the orientational order parameter, 〈P2〉, from measured near-field emission intensity image data. Numerous domains of long-range order up to 2 μm in size with 〈P2〉 values ranging from 0.47 to 0.76 are identified, indicating extensive axial alignment of emissive β-phase chains within the nanowires. Poly(9,9-dioctylfluorene) nanowires exhibiting micrometer-scale order make them attractive elements for future subwavelength organic opto-electronic devices.

UR - http://www.scopus.com/inward/record.url?scp=55849107429&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=55849107429&partnerID=8YFLogxK

U2 - 10.1021/cm8015534

DO - 10.1021/cm8015534

M3 - Article

AN - SCOPUS:55849107429

VL - 20

SP - 6501

EP - 6508

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 20

ER -