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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/046/0075

    • Keywords

       

      Aerogels; Gd$_2$O$_3$; Eu$_2$O$_3$; luminescence; sol–gel.

    • Abstract

       

      This study reports on the fabrication and characterization of luminescent aerogels of Gd$_2$O$_3$:Eu$^{3+}$ and Gd$_2$O$_3$:(Eu$^{3+}$, Tb$^{3+}$), synthetized by the sol–gel method and the supercritical drying technique. The mol% concentration of the Eu$^{3+}$ and Tb$^{3+}$ ions in the synthesis were varied to study the effects of concentration on the luminescent properties of the aerogels. The results show that the Gd$_2$O$_3$:Eu$^{3+}$ and the Gd$_2$O$_3$:(Eu$^{3+}$, Tb$^{3+}$) aerogels exhibited a maximume mission at ${\lambda}$ = 613 nm. For all the samples, a decay in light intensity occurred when a concentration of 8 mol% of Eu$^{3+}$ was exceeded, regardless of whether the Tb$^{3+}$ ion was present. The analysis by X-ray diffraction showed that the aerogels of Gd$_2$O$_3$:Eu$^{3+}$, like those of Gd$_2$O$_3$:(Eu$^{3+}$, Tb$^{3+}$), had a cubic crystalline structure with no change even at high concentrations of Eu$^{3+}$. The microscopy analyses showed that the aerogels present a porous structure made up of interconnected quasi-spherical nanoparticles that formed a three-dimensional network. Quantum yield analysis shows that Tb$^{3+}$ acts as a sensitizer of Eu$^{3+}$, increasing the light intensity in the aerogels. The results reveal that it is possible to manufacture luminescent aerogels of rare-earth oxides that can be used in opto-electronic devices.

    • Author Affiliations

       

      VICTOR M GARCÍA RAMÍREZ1 ANTONIETA GARCÍA MURILLO1 FELIPE DE J CARRILLO ROMO1 ARTURO CERVANTES TOBÓN2 NICOLÁS CAYETANO CASTRO3

      1. Instituto Politécnico Nacional, CIITEC, CP 02250 Mexico City, Mexico
      2. Instituto Politécnico Nacional, ESIQIE, Av. Instituto Politécnico Nacional, CP 07738 Mexico City, Mexico
      3. Instituto Politécnico Nacional, CNMN, Nueva Industrial Vallejo, CP 07738 Mexico City, Mexico
    • Dates

       
  • Bulletin of Materials Science | News

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