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Photoinduced Enhancement of Photoluminescence Intensity in PPV Films

Published online by Cambridge University Press:  21 March 2011

Yara Galvão Gobato ,
Alexandre Marletta ,
Jucimar M. Souza ,
Ernesto Pereira ,
Roberto M. Faria  and
Francisco E.G. Guimarães
Yara Galvão Gobato
Affiliation:
Departamento de Física-Universidade Federal de São Carlos, CP 676, 13560-970, São Carlos-SP, Brazil
Alexandre Marletta
Affiliation:
Instituto de Física de São Carlos, Universidade de São Carlos, CP 369, 1350-970, São Carlos-SP, Brazil
Jucimar M. Souza
Affiliation:
CMDMC-LIEC-Universidade Federal de São Carlos, CP676, 13560-970, São Carlos, Brazil
Ernesto Pereira
Affiliation:
CMDMC-LIEC-Universidade Federal de São Carlos, CP676, 13560-970, São Carlos, Brazil
Roberto M. Faria
Affiliation:
Instituto de Física de São Carlos, Universidade de São Carlos, CP 369, 1350-970, São Carlos-SP, Brazil
Francisco E.G. Guimarães
Affiliation:
Instituto de Física de São Carlos, Universidade de São Carlos, CP 369, 1350-970, São Carlos-SP, Brazil
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Abstract

Poly(p-phenylene vinylene) (PPV) films are usually photodegraded in air. We report on the enhancement of photoluminescence (PL) intensity of PPV films induced by Ar ion laser in the presence of air. The PL spectra were measured as function of laser power, time exposure and sample thickness. The initial PL intensity increases up to 300% without significant changes in peak positions by optimizing such parameters. This effect is accompanied by a blue-shift in the absorption spectrum resulting in shortened effective conjugation length and by a formation of defects such as carbonyl groups. Mechanisms for the observed photoluminescence intensity enhancements are suggested.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C1.3
Copyright
Copyright © Materials Research Society 2001

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References

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