Comparable optical properties and dispersion parameters of monomeric axial ruthenium phthalocyanine thin films

• Published in: Journal of luminescence 2013-06, Vol.138, p.187-194
• Main Authors: Youssef, Tamer E., El-Nahass, M.M., El-Zaidia, E.F.M.
• Format: Article
• Language: English
• Subjects: Absorption spectra; Axial substituent effect; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric constant; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Dispersions; Energy gap; Exact sciences and technology; Mathematical models; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Oscillators; Permittivity (dielectric function); Physics; Ruthenium; Ruthenium phthalocyanine thin films; Thin films
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.01.026

The ruthenium phthalocyanine complex [(n-hexyl)8PcRu] (2) and their derivatives [(n-hexyl)8PcRu(t-buNC)2] (3) and [(n-hexyl)8PcRu(Mepyr)2] (4) have been synthesized and characterized. The optical properties of their films have been studied by spectrophotometer measurements of transmittance and reflectance at normal incidence of light in the spectral range of 200–2500nm. Absorption spectra of the films showed B and C absorption bands in the UV region followed by a Q-band in the visible region. The absorption parameters such as molar extinction coefficient, oscillator strength and electric dipole strength have been reported. The type of electronic transition is determined from an analysis of the absorption coefficient and found to be indirect allowed transition with onset energy gap and optical energy gap. The single oscillator model has been applied to calculate the dispersion parameters. The oscillator energy, the dispersion energy, the high frequency dielectric constant, the lattice dielectric constant and the ratio of free charge carriers concentration to their effective mass were evaluated. The dielectric properties of the films were also determined, showing that peripheral and axial ligand substituents on the complexes have a significant effect on their surface coverage. ► Two ruthenium phthalocyanine complexes were synthesized and characterized. ► Their films were fabricated using conventional thermal evaporation technique. ► Optical properties were studied at normal incidence of light. ► Absorption and dielectric properties were determined. ► Experimental results are in agreement with predicted spectroscopic properties.