Poly(p-phenylene vinylene)

Poly(p-phenylene vinylene) (PPV, or polyphenylene vinylene) is a conducting polymer of the rigid-rod polymer host family.

PPV is the only polymer of this type that has so far been successfully processed into a highly ordered crystalline thin film.

PPV is prepared by thermal processing of a precursor polymer. By careful control of the processing it is possible to influence the structure and morphology of the film.

Polyphenylene vinylene is capable of electroluminescence, leading to applications in polymer-based organic light emitting diodes. PPV was used as the emissive layer in the first polymer light-emitting diodes. [J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay & R. H. Burn, Nature 347, 539 (1990)] Devices based on PPV emit yellow-green light, and derivatives of PPV obtained by substitution are often used when light of a different color is required.

In presence of even a small amount of oxygen, singlet oxygen is formed during operation, by energy transfer from the excited polymer molecules to oxygen molecules. These oxygen radicals then attack the structure of the polymer, leading to its degradation. Special precautions therefore have to be kept during manufacturing of PPV in order to prevent oxygen contamination.

References

External links

* [http://romano.physics.wisc.edu/winokur/handbook/node6.html Poly(p-phenylene vinylene)]
* [http://www.odcad.com/html/organicdevice_appearance1.HTM Materials for Organic devices]