A photoluminescence study of poly(phenylene vinylene) derivatives: The effect of intrinsic persistence length

C. L. Gettinger, A. J. Heeger, J. M. Drake, D. J. Pine

Research output: Contribution to journalArticle

Abstract

We report the results of light scattering, absorption, excitation, and emission spectroscopy of three polyphenylene vinylene (PPV) derivatives; poly[2-methoxy, 5-(2′-ethyl-hexyloxy-p-phenylene-vinylene] (MEH-PPV), poly[2-butoxy, 5-(2′-ethyl-hexyloxy-p-phenylene-vinylene] (BEH-PPV), and poly[2-dicholestanoxy-p-phenylene-vinylene] (BCHA-PPV) in solution with p-xylene. We find that increasing the size of the solubilizing side chains increases the intrinsic persistence length of the polyphenylene vinylene backbone and that this change in stiffness has dramatic effects on the photoluminescence of polyphenylene vinylene. We have determined the luminescence quantum efficiencies of the polyphenylene vinylene derivatives relative to a known standard, Rhodamine 6G, and find that the photoluminescence can be greatly enhanced by increasing the intrinsic stiffness of the polymer backbone. The stiffest polymer, poly[2-dicholestanoxy-p-phenylene-vinylene] (BCHA-PPV), has a quantum efficiency of 0.66±0.05. The quantum efficiency decreases to 0.22±0.05 for poly[2-butoxy, 5-(2′-ethyl-hexyloxy-p-phenylene- vinylene] (BEH-PPV) and 0.20±0.05 for poly[2-methoxy, 5-(2′-ethyl-hexyloxy-p-phenylene-vinylene] (MEH-PPV), the most coiled derivative. Excitation profiles of the three derivatives also show an increase in nonradiative decay at high energies when the polymer assumes a more coiled comformation. Thus, the quantum yields are dependent on pump energy.

Original languageEnglish (US)
Pages (from-to)1673-1678
Number of pages6
JournalThe Journal of chemical physics
Volume101
Issue number2
StatePublished - 1994

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Polyphenylene vinylene
quantum efficiency
Photoluminescence
Derivatives
photoluminescence
stiffness
polymers
Quantum efficiency
spectroscopy
Polymers
xylene
rhodamine
excitation
absorption spectroscopy
light scattering
Stiffness
luminescence
pumps
energy
Emission spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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A photoluminescence study of poly(phenylene vinylene) derivatives : The effect of intrinsic persistence length. / Gettinger, C. L.; Heeger, A. J.; Drake, J. M.; Pine, D. J.

In: The Journal of chemical physics, Vol. 101, No. 2, 1994, p. 1673-1678.

Research output: Contribution to journalArticle

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