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APS » Journals » Phys. Rev. B » Volume 50 » Issue 19
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Phys. Rev. B 50, 14702–14705 (1994)

Excitons in poly(para-phenylenevinylene)

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M. Chandross
Department of Physics, University of Arizona, Tucson, Arizona 85721

S. Mazumdar
Department of Physics and The Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

S. Jeglinski, X. Wei, and Z. V. Vardeny
Department of Physics, University of Utah, Salt Lake City, Utah 84112

E. W. Kwock and T. M. Miller
AT&T Bell Laboratories, Murray Hill, New Jersey 07974

We show that one-electron band theory fails to describe optical absorption in PPV and the absorption spectrum can be described only within a Coulomb-correlated model. The lowest optical state is an exciton, whose binding energy is estimated theoretically to be 0.90±0.15 eV. Measurements of the photoconductivity quantum efficiency in poly[2-methoxy,5-(2’-ethyl-hexyloxy)-1,4 phenylenevinylene] reveal a binding energy in good agreement with the theoretical value.

© 1994 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.50.14702
DOI:
10.1103/PhysRevB.50.14702
PACS:
71.35.+z, 72.40.+w, 78.55.Kz, 78.66.Qn
 
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