Anisotropic optical functions of α-1,4,4-tetraphenyl-1,3-butadiene

Silvia Tavazzi, Stefano Mora, Laura Alessandrini, Leonardo Silvestri

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

One of the known monoclinic polymorphs of 1,1,4,4-tetraphenyl-1,3-butadiene was grown by the floating-drop technique. This material is of interest for blue emitting devices and for fundamental studies on intermolecular interactions, excited states and vibronic coupling in the fields of chemical physics and materials science. Polarized UV-visible spectra are reported. The origin of the optical bands is resolved. The results give information on the intermolecular interactions and are compared with theoretical predictions and modeling. The full material dielectric tensor is provided, as deduced from generalized spectroscopic ellipsometry. Details on the use of this technique on strongly anisotropic and absorbing molecular materials are given. Some typical features of the optical spectra are also demonstrated to be very sensitive to the presence of misaligned domains, which, in our samples, are found to be rotated around the normal to the surface and whose amount is determined. The method allows discriminating among monocrystals, in-plane polycrystalline samples, layered samples formed by misaligned successive layers, or samples with both types of disorder. Two independent parameters giving the fraction of misaligned domains or layers are suggested for the characterization and optimization of the growth and deposition of molecular organic materials.

Original languageEnglish
Article number034707
JournalJournal of Chemical Physics
Volume134
Issue number3
DOIs
Publication statusPublished - Jan 21 2011

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Physics
butadiene
Equipment and Supplies
Growth
Spectroscopic ellipsometry
Materials science
Polymorphism
Excited states
Tensors
materials science
organic materials
visible spectrum
floating
ellipsometry
optical spectrum
interactions
disorders
tensors
physics
optimization

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Anisotropic optical functions of α-1,4,4-tetraphenyl-1,3-butadiene. / Tavazzi, Silvia; Mora, Stefano; Alessandrini, Laura; Silvestri, Leonardo.

In: Journal of Chemical Physics, Vol. 134, No. 3, 034707, 21.01.2011.

Research output: Contribution to journalArticle

Tavazzi, Silvia ; Mora, Stefano ; Alessandrini, Laura ; Silvestri, Leonardo. / Anisotropic optical functions of α-1,4,4-tetraphenyl-1,3-butadiene. In: Journal of Chemical Physics. 2011 ; Vol. 134, No. 3.
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