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Issue 12, 2001
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Abstract

A soluble PPV derivative (C-PPV) with high molecular weight, substituted with a crown ether in direct π-conjugation at the 2,3-position, has been synthesized via a modified Gilch route in good yield. The double layer LED based on C-PPV (ITO/C-PPV/Alq3/Al) exhibits a high luminance of 730 cd m−2, and emits yellow–green light with an external EL quantum efficiency of 0.04%. The fluorescence attenuation of the polymer solution is found upon K+, Na+, or Li+ binding. The AFM provides high-resolution images of C-PPV in thin films constructed from a very dilute solution in the absence and presence of metal ions. Worm-like images with well-defined width and height are observed only in the presence of K+, which is in striking contrast to the individual ball shape of C-PPV molecules in the absence of K+, or in the presence of Na+, or Li+. It was also observed that the worm-like images grew longer and longer as the solution of C-PPV in the presence of K+ stood longer. These unique self-assembling features of the C-PPV molecules may be attributed to the complexation of K+.

Graphical abstract: Synthesis and properties of crown ether containing poly(p-phenylenevinylene)

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Article information


Submitted
04 Jul 2001
Accepted
03 Oct 2001
First published
06 Nov 2001

J. Mater. Chem., 2001,11, 3063-3067
Article type
Paper

Synthesis and properties of crown ether containing poly(p-phenylenevinylene)

H. Liu, S. Wang, Y. Luo, W. Tang, G. Yu, L. Li, C. Chen, Y. Liu and F. Xi, J. Mater. Chem., 2001, 11, 3063
DOI: 10.1039/B105905J

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