Spectroscopic Ellipsometry Studies of CuPc and Other Materials for Organic Light-Emitting Devices

概要

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Optical properties of copper phthalocyanine (CuPc), tris(8-hydroxyquinoline)aluminum (Alq3), $N$,$N^{\prime}$-bis-(1-naphthyl)-$N$,$N^{\prime}$-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB), and Rubrene films, deposited on silicon substrates by evaporation, are presented. Measurements of the complex dielectric function, $\langle\tilde{\varepsilon}=\varepsilon_{1}+i\varepsilon_{2}\rangle$, were performed at room temperature in the photon energy range of 1.24–4.96 eV, using a computer-controlled variable-incidence-angle ellipsometer. A model of the dielectric function described using Lorentzian approximation, and the spectral dependences of the real $\varepsilon_{1}$ and imaginary $\varepsilon_{2}$ parts of the complex dielectric function of each material were obtained. The optical band gap ($E_{\text{g}}$) of each material was also derived from the edge of the absorption.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-03-15