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

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Abstract

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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Submitted
01 Sep 2010
Accepted
12 Nov 2010
First published
13 Dec 2010

Soft Matter, 2011,7, 1702-1707
Article type
Paper

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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