Abstract

SOSA F., R.; FLORES H., M.; RODRIGUEZ T., R.  and  MUNOZ F., A.. Optical properties and Judd-Ofelt intensity parameters of Eu³⁺ in PMMA: PAAc copolymer samples. Rev. mex. fis. [online]. 2003, vol.49, n.6, pp.519-524. ISSN 0035-001X.

Eu³⁺-activated PMMA:PAAc copolymers samples with different concentrations of Eu³⁺ ions were prepared and the spectroscopic properties investigated. The mass density, refractive index, UV-Visible absorption and emission spectra and fluorescence decay times were experimentally obtained. These data were used with the Judd-Ofelt theory to calculate the oscillator strengths, the spontaneous emission probabilities and the branching ratios as a function of the europium content; the Eu concentration was varied in the range from 0.1 to 3 mol %. The europium ions affect the polymerization mechanism since their presence produced a steric effect, which reduces the reactivity ofthe acrylic acid. We analyzed the optical interaction mechanism between the RE³⁺ and the polymeric matrix, which is of radiative type.

Keywords : Energy transfer; Judd-Ofelt theory; optical absorption; copolymers.

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