Eur. Phys. J. Appl. Phys.
Volume 41, Number 1, January 2008
|Page(s)||33 - 40|
|Section||Laser and Optics|
|Published online||05 February 2008|
Influence of heat treatment and γ-irradiation on the optical properties of methylene blue trihydrate thin films
Physics department, Faculty of Education, Ain Shams University, Roxy 11757
Corresponding author: email@example.com
Revised: 24 October 2007
Accepted: 26 October 2007
Published online: 5 February 2008
Structural and optical properties of thermally evaporated methylene blue trihydrate thin films up to a film thickness of 165 nm have been investigated. The lattice constants and the crystallite size were calculated. The optical parameters were obtained using spectrophotometric measurements of the transmittance and reflectance at normal incidence of light in the wavelengths range 200–2500 nm. Below the absorption edge, subgap absorption in the energy range 0.75–1.4 eV was observed and interpreted in terms of defect states induced absorption phenomena and act as deep traps for charge carriers. The type of optical transition was found to be an indirect allowed transition. The values of the optical gap Eopt, the transport gap Et, the exciton binding energy EB, the Urbach's energy Eu and the dispersion parameters for as-deposited, annealed and irradiated films with different doses of γ-irradiation were estimated and discussed their influenced by heat treatment and irradiation.
PACS: 61.80.Ed – gamma-ray effects / 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity) / 81.40.Tv – Optical and dielectric properties (related to treatment conditions)
© EDP Sciences, 2008
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