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Dielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra
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10.1063/1.2897436
/content/aip/journal/jcp/128/15/10.1063/1.2897436
http://aip.metastore.ingenta.com/content/aip/journal/jcp/128/15/10.1063/1.2897436

Figures

Image of FIG. 1.
FIG. 1.

Arrangement of the molecules in the unit cell (whose axes are , , and ) as viewed from the perpendicular to the plane ( axis) for a crystal exposing the (001) face. The Cartesian axes , , and chosen along , along the perpendicular to in the (001) plane, and along are also shown, together with the direction of polarization giving the maximum absorbance at at normal incidence on the (001) tetracene face ( axis).

Image of FIG. 2.
FIG. 2.

(a) Absorption spectra of a thick tetracene single crystal measured at normal incidence on the (001) face with the incident electric field either parallel or perpendicular to the axis and absorbance spectra calculated for a thick crystal for the same experimental configuration. (b) Imaginary parts of the and components of the calculated diagonal dielectric tensor.

Image of FIG. 3.
FIG. 3.

Absorption spectra of a thick tetracene single crystal taken at oblique incidence on the (001) face using as plane of incidence and polarized light. Inset: measured absorbance integrated between 2.1 and as deduced from the spectra measured at oblique incidence as a function of the angle of incidence.

Image of FIG. 4.
FIG. 4.

Ellipsometry angles as measured (a) or generated by the biaxial model (b) at incidence angles of 45°, 55°, and 65° on the (001) face of a tetracene crystal using as the plane of incidence.

Image of FIG. 5.
FIG. 5.

Real and imaginary parts of the refractive indices along the principal axes and of tetracene crystals as deduced from the fitting of the ellipsometry and absorption experimental data (the corresponding values of the Lorentz oscillators are reported in Table II) or deduced from the calculated dielectric tensor by using Eq. (1), where and have been taken from Ref. 31 as described in the text, has been estimated equal to 2.1 to reproduce the real part of the experimental refractive indexes, has been estimated equal to to reproduce the width of the bands of the imaginary part of the experimental refractive indices, , and is taken from the crystallographic data (Ref. 26).

Image of FIG. 6.
FIG. 6.

PL spectra from tetracene single crystals with thicknesses of (a) and (b) taken at room temperature and collecting the light emitted along the normal to the {001} surface with the analyzer either along or perpendicular to the axis. In (a), we also show the polarized absorbance spectra of a thick crystal at room temperature and at normal incidence on the (001) face. The vertical dotted line underlines the redshift of the 0-0 transition peak upon increasing the sample thickness. Insets: (a) Tetracene crystal imaged by fluorescence microscopy. (b) Dependence on the crystal thickness of the ratio between the calculated transmittance for light traveling along with -polarized incident light and crossed analyzer and the calculated transmittance for light traveling along with -polarized incident light and parallel analyzer.

Tables

Generic image for table
Table I.

Calculated direction cosines with respect to the , , and axes of the dipole moments of the transitions at lowest energy to the lowest and upper Davydov states and direction cosines of the principal axes , , and of the tetracene dielectric tensor calculated at .

Generic image for table
Table II.

Values of the constants and of the parameters of the Lorentz oscillators for the components of the diagonal dielectric tensor of tetracene with principal axes along , , and . The label indicates the different vibronic replicas.

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/content/aip/journal/jcp/128/15/10.1063/1.2897436
2008-04-16
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra
http://aip.metastore.ingenta.com/content/aip/journal/jcp/128/15/10.1063/1.2897436
10.1063/1.2897436
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