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Investigations of the nonhomogeneities in organic molecular crystalline materials using Kubelka-Munk theory

M. SOCOL1, A. STANCULESCU1,*

Affiliation

  1. National Institute R&D for Materials Physics, 105bis Atomistilor Street, P.O. Box MG 7, 077125 Magurele, Bucharest, Romania

Abstract

This paper presents a study of the nonhomogeneities in doped meta-dinitrobenzene (m-DNB) crystalline films. These growth defects lying in the film plane with dimensions smaler than the films thickness are correlated with the effect of the dopant on the crystallization regime in the dendritic growth conditions. To evaluate the dimension of the growth nonhomogeneities we have used a model based on the Kubelka-Munk theory, emphasising the general constraints imposed to the sample and the experimental set-up, and developing a more complex model through a step-by-step relaxation of these constraints, that ensures a better approximation for our experimental configuration. We have deduced higher scattering coefficients in m-DNB doped with 1,3 dihydroxybenzene (resorcinol) than in m-DNB doped with 8-hydroxyquinoline (oxine) films prepared by a rapid thermal solidification process. We also have emphasised that for the films of m-DNB doped with oxine the size of the scattering centers is larger than the wavelength of the radiation and in films of m-DNB doped with resorcinol the radiation scattering corresponds to a multiple scattering process leading to the superposition of different scattering mechanisms on centers with different dimensions..

Keywords

Organic compounds, Crystalline thin film, Reflectance spectroscopy, Kubelka-Munk theory.

Submitted at: Jan. 10, 2006
Accepted at: Jan. 26, 2006

Citation

M. SOCOL, A. STANCULESCU, Investigations of the nonhomogeneities in organic molecular crystalline materials using Kubelka-Munk theory, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 185-190 (2006)