Judd-Ofelt analysis on trifluoroacetate europium complexes for liquid laser media

Abstract

Four europium trifluoroacetate complexes, Eu(CF₃COO)₃·bpy(bpy=2,2′-bipyridine)(1), Eu(CF₃COO)₃·phen(phen=1,10-phenanthroline)(2), Eu(CF₃COO)₃·2bp(bp=benzophenone)(3) and Eu(CF₃COO)₃·2tppo(tppo=triphenyl-phosphine oxide)(4) were synthesized and characterized by elemental analysis, Fourier transform infrared(FTIR) spectroscopy, photoluminescence(PL) spectroscopy and thermogravimetric analysis(TGA). The PL spectra of the complexes at room temperature show the strong typical Eu³⁺ ion red emission, due to the efficient energy “antenna absorption” of ligands and transitions of Eu³⁺ ion between ⁵ D ₀→⁷ F _J(J=0–4). The long lifetime and high quantum yield reflect that the multiphonon relaxations by coupling to O-H and C-H vibrations were reduced. According to the photoluminescent spectra, the Judd-Ofelt parameters Ω ₂ and Ω ₄ of the complexes were calculated and the radiative properties were also presented. The ⁵ D ₀ radiative lifetime, quantum yield and the stimulated emission cross-section of the complexes are excellent, which prove that they have promising optical properties for liquid laser. The thermal analyses indicate that they are quite stable to heat.

Keywords

Europium complex / Luminescent property / Judd-Ofelt theory

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