Blue- and red-emitting phosphor nanoparticles embedded in a porous matrix

  • Taghavinia N
  • Lerondel G
  • Makino H
 et al. 
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Eu3+- and Ce3+-doped yttrium silicate, as well as Eu2+-doped zinc silicate nanoparticles, were grown in a porous SiO2matrix using an impregnation method. For Y2Si2O7:Eu3+, particles of about 50 nm size were obtained that exhibited several photoluminescence (PL) peaks in red. Different peaks showed slightly different decay times; however, their excitation mechanism was found the same. Increasing the Eu concentration increased the PL intensity while reducing the decay time. Y2Si2O7:Ce3+nanoparticles in the porous matrix showed bright blue emission, consisting of two peaks at 358 nm and 378 nm. Re-impregnation process was found effective in changing the relative intensity of the two peaks. Zn2SiO4:Eu2+nanoparticles in porous glass consisted of amorphous particles of about 20 nm size inside the porous matrix. The luminescence was a broad peak centered at 418 nm. These phosphor systems, together with our previously reported Zn2SiO4:Mn2+in porous SiO2structure, comprise a red-green-blue system that can be used in display applications. © 2005 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Cerium
  • Luminescence
  • Porous substrate
  • Yttrium
  • Zinc

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