Issue 19, 2016

Highly emissive ‘frozen-in’ conjugated polymer nanofibers

Abstract

Conjugated-polymer nanofibers with a thermodynamically stable, coarsened, disordered structure in an amorphous glassy state were fabricated via a freeze-drying method using a poly(diphenylacetylene) derivative. The nanofibers were extremely emissive, with a fluorescence (FL) quantum yield of approximately 0.34, which was much higher than that of both the cast film (0.02) and the solution (0.21). Similarly, the amplitude-weighted average FL lifetime of the nanofibers was 0.74 ns, which was much longer than that of the film (0.29 ns) and the solution (0.57 ns). This unusual and enhanced FL-emission behavior was attributed to the abruptly quenched chain structure that was created by the freeze-drying process. The polymer chains in the nanofibers remained frozen-in and the side phenyl rings were retained in a relaxed state. The metastable chains did not undergo vibrational relaxation and collisional quenching to generate the radiative emission decay effectively.

Graphical abstract: Highly emissive ‘frozen-in’ conjugated polymer nanofibers

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2016
Accepted
08 Apr 2016
First published
08 Apr 2016

Soft Matter, 2016,12, 4443-4448

Highly emissive ‘frozen-in’ conjugated polymer nanofibers

Y. Jin, W. Lee, C. Lee and G. Kwak, Soft Matter, 2016, 12, 4443 DOI: 10.1039/C6SM00286B

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