(Gd0.95Eu0.05)(OH)3 Nanomaterials via Hydrothermal Processing and their Transformation into Single Crystalline (Gd0.95Eu0.05)2O3 with Enhanced Photoluminescence

Chang Fa Li; Ji Guang Li

doi:10.4028/www.scientific.net/AMR.320.309

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 320(Gd0.95Eu0.05)(OH)3 Nanomaterials via Hydrothermal...

(Gd_0.95Eu_0.05)(OH)₃ Nanomaterials via Hydrothermal Processing and their Transformation into Single Crystalline (Gd_0.95Eu_0.05)₂O₃ with Enhanced Photoluminescence

Abstract:

In this work, hexagonal solid solutions of (Gd_0.95Eu_0.05)(OH)₃ with two distinctive morphologies of nanorods and nanotubes were successfully synthesized via hydrothermal treatment of mixed nitrate solutions in the presence of ammonium hydroxide. The hydroxide samples exhibited characteristic Eu³⁺ photoluminescence through the energy transfer from Gd³⁺ to Eu³⁺ and the self-excitation of Eu³⁺. The hydroxide precursors transformed into cubic (Gd_0.95Eu_0.05)₂O₃ at ~500 °C via an intermediate monoclinic (Gd_0.95Eu_0.05)OOH phase, and the Eu³⁺ coordination accordingly experienced symmetry changes from D_3h to C_2v, and then to C₂/S₆. The cubic (Gd_0.95Eu_0.05)₂O₃ well retained the original morphologies of their polycrystalline precursors and exhibited a single-crystalline character at 1000 °C. Greatly enhanced photoluminescence (~5000 times that of the hydroxides) was observed for the phase conversion.