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Highly Anisotropic Luminescence from Poly(9,9-dioctylfluorene) Nanowires Doped with Orientationally Ordered β-Phase Polymer Chains

O'Carroll, Deirdre and Redmond, Gareth (2008) Highly Anisotropic Luminescence from Poly(9,9-dioctylfluorene) Nanowires Doped with Orientationally Ordered β-Phase Polymer Chains. Chemistry of Materials, 20 (20). pp. 6501-6508. ISSN 0897-4756. doi:10.1021/cm8015534. https://resolver.caltech.edu/CaltechAUTHORS:20161014-160236471

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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, ⟨P_2⟩, from measured near-field emission intensity image data. Numerous domains of long-range order up to 2 μm in size with ⟨P_2⟩ 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/cm8015534DOIArticle
http://pubs.acs.org/doi/abs/10.1021/cm8015534PublisherArticle
http://pubs.acs.org/doi/suppl/10.1021/cm8015534PublisherSupporting Information
Additional Information:© 2008 American Chemical Society. Received June 9, 2008. Revised Manuscript Received August 18, 2008. Publication Date (Web): September 30, 2008. This work was supported by the Irish HEA PRTLI Nanoscience and IRCSET Embark initiatives and by the EC “Nano3D” project.
Funders:
Funding AgencyGrant Number
Higher Education Authority (Ireland)UNSPECIFIED
European CommissionUNSPECIFIED
Issue or Number:20
DOI:10.1021/cm8015534
Record Number:CaltechAUTHORS:20161014-160236471
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161014-160236471
Official Citation:Highly Anisotropic Luminescence from Poly(9,9-dioctylfluorene) Nanowires Doped with Orientationally Ordered β-Phase Polymer Chains Deirdre O’Carroll and Gareth Redmond Chemistry of Materials 2008 20 (20), 6501-6508 DOI: 10.1021/cm8015534
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71123
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Oct 2016 19:31
Last Modified:11 Nov 2021 04:39

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