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

作者：Nobre Sonia S; Ferreira Rute A S; Cattoen Xavier; Benyahya Sofia; Taillefer Marc; Bermudez Veronica de Zea; Man Michel Wong Chi; Carlos Luis D^*

来源：Spectroscopy Letters, 2010, 43(5): 321-332.

DOI：10.1080/00387010.2010.486712

• 2
• 2'-Bipyridine
• bridged polysilsesquioxanes
• lanthanides
• photoluminescence
• sol-gel
• urea

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.

• 出版日期2010