Lanthanide-Containing 2,2'-Bipyridine Bridged Urea Cross-Linked Polysilsesquioxanes

resumo

Urea-based bis-silylated 2,2'-Bipyridine (bpy) organic-inorganic hybrids incorporating different lanthanide (Ln3+) ions (Eu3+, Gd3+, Tb3+ or Eu3+/Tb3+) were obtained by the sol-gel process. The structure and the emission characteristics of the hybrids were ascertained using X-ray diffraction, nuclear magnetic resonance, Fourier transform infrared spectroscopy, photoluminescence, and quantum yield measurements. The hybrids feature both the emission of the host and the Eu3+ and/or Tb3+ transitions allowing a fine-tuning of the color from the blue to the red, orange, or green spectral regions. Bpy-to-Ln3+ and Tb3+-to-Eu3+ energy transfer mechanisms are demonstrated and the hybrids present slightly distinct Ln3+ coordination spheres due to the different bpy/Ln3+ ratios.

palavras-chave

ORGANIC-INORGANIC HYBRIDS; CARBOXYLIC-ACID SOLVOLYSIS; WHITE-LIGHT EMISSION; FULL-COLOR PHOSPHORS; METAL ACTIVATOR IONS; ENERGY-TRANSFER; LUMINESCENCE PROPERTIES; QUANTUM YIELDS; COMPLEXES; PHOTOLUMINESCENCE

categoria

Spectroscopy

autores

Nobre, SS; Ferreira, RAS; Cattoen, X; Benyahya, S; Taillefer, M; Bermudez, VD; Man, MWC; Carlos, LD

nossos autores

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