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FELIPE DE J CARRILLO ROMO
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Volume 46 All articles Published: 13 April 2023 Article ID 0075
Luminescent aerogels of Gd$_2$O$_3$:Eu$^{3+}$ and Gd$_2$O$_3$:(Eu$^{3+}$, Tb$^{3+}$)
VICTOR M GARCÍA RAMÍREZ ANTONIETA GARCÍA MURILLO FELIPE DE J CARRILLO ROMO ARTURO CERVANTES TOBÓN NICOLÁS CAYETANO CASTRO
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.
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Bulletin of Materials Science
Volume 46, 2023
All articles
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