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Line Shape Analysis of Photoluminescence Spectra on Solutions of MD-PPV

Published online by Cambridge University Press:  15 March 2011

L. F. Santos ,
F.M. Marconi ,
R.F. Bianchi ,
A. Marletta ,
L. A. O. Nunes ,
R. M. Faria  and
D.T. Balogh
L. F. Santos
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
F.M. Marconi
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
R.F. Bianchi
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
A. Marletta
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
L. A. O. Nunes
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
R. M. Faria
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
D.T. Balogh
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970,São Carlos, SP, BRAZIL
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Abstract

In this work, we study the influence of organic solvents on the absorption and emission spectra of solutions and films of a soluble poly-(p-phenylenevinylene)- PPV derivative, the poly(3-methoxy-5-dodecoxy-p-phenylene-vinylene)- MD-PPV. We carried out absorption in the UV-Vis range, photoluminescence (PL) and photoluminescence excitation (PLE) measurements of MD-PPV solutions and cast films from five different solvents at room temperature. UV-Vis measurements show a solvatochromic effect, presenting a blue shift of the lowest-energy edge of the φ-φ* transition band for different solvents. PL spectra, on the other hand, show a multi-peak behavior, which is fitted considering an excitonic transition model followed by vibronic structure replica. It is observed that the first vibronic peak intensity tends to increase in comparison to the excitonic peak as δH increases, indicating that the solubility parameter of the solvent has a direct influence on the electron-phonon coupling. In addition, deviations from the intrachain model were observed for aromatic solvents, suggesting that aggregate formation can take place in the emission spectrum. Excitation spectra show that a new excitation peak comes out around 550 nm for poorer solvent solutions at higher PLE detection wavelengths, which is consistent with aggregate states emission.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB3.34
Copyright
Copyright © Materials Research Society 2002

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References

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