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Issue 5, 2011
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Photoluminescence of conjugated polymer blends at the nanoscale

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Here we report on a combined photoluminescence and morphological study of a polymerpolymer blend composed of a copolymer of derivatives of polyspirobifluorene and polyfluorene (PBFF) and a derivative of polyphenylene vinylene (MDMO-PPV). Evidence of partial Förster energy transfer from PBFF to MDMO-PPV is revealed by steady-state and time-resolved photoluminescence. Atomic force microscopy (AFM) on blends with different weight ratios of host (PBFF) and guest (MDMO-PPV) polymers shows that in blends with a MDMO-PPV concentration higher than 10% two phases are present. The nature of the phases is identified by means of scanning near-field optical microscopy (SNOM). Using this technique the topography and the local photoluminescence of the thin film are simultaneously mapped with a spatial resolution of ∼100 nm. The local measurements reveal that the PL signal of MDMO-PPV is present in the whole surface, but with variations of the PL intensity and spectral shape. The correlation of the SNOM, time-resolved and steady-state photoluminescence measurements allows us to identify the two phases, one rich in PBFF and the other rich in MDMO-PPV.

Graphical abstract: Photoluminescence of conjugated polymer blends at the nanoscale

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Publication details

The article was received on 01 Sep 2010, accepted on 12 Nov 2010 and first published on 13 Dec 2010

Article type: Paper
DOI: 10.1039/C0SM00907E
Citation: Soft Matter, 2011,7, 1702-1707
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    Photoluminescence of conjugated polymer blends at the nanoscale

    D. Jarzab, M. Lu, H. T. Nicolai, P. W. M. Blom and M. A. Loi, Soft Matter, 2011, 7, 1702
    DOI: 10.1039/C0SM00907E

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