Eu³⁺doped lanthanum oxide nanowhiskers: microwave hydrothermal synthesis, characterization and photoluminescence properties

Abstract

We report here a straightforward and rapid microwave–hydrothermal route providing an easy synthesis of Eu3+ doped La2O3 nanowhiskers. The nanostructured Eu3+ doped La2O3 is characterized by x-ray diffraction studies, scanning electron microscopy and photoluminescence (PL). The emission spectrum shows transitions from the excited 5D0 state to 7FJ (J = 0, 1, 2, 3, 4) levels of the Eu3+ ion. The most intense peak around 611 nm is due to the 5D0 → 7F2 transition, expected from the Judd–Ofelt selection rules. PL spectra measurements demonstrate that the lanthanum oxide nanowhisker shows higher PL intensity.

Hydrothermal synthetic strategies of inorganic semiconducting nanostructures

“…Various inorganic semiconducting nanostructures, such as mono-metal oxides (TiO 2 , ZnO, La 2 O 3 , Fe 2 O 3 , Fe 3 O 4 , CuO, SnO 2 , WO 3 and CeO 2 ), [324][325][326][327][328][329][330][331][332][333][334][335] complex metal oxides [BaTiO 3 , Bi 2 WO 6 , AgIn(WO 4 ) 2 , Bi 2 MoO 6 , BiFeO 3 , KNbO 3 , Fe 2 (MoO 4 ) 3 , Cd 2 Ge 2 O 6 , Zn 2 SnO 4 , MnWO 4 and CaMoO 4 ], [336][337][338][339][340][341][342][343][344][345][346][347][348][349][350][351][352] hydroxides [GaOOH, In(OH) 3 and Ni(OH) 2 ], [353][354][355][356] chalcogenide (FeSe), 357 phosphides (Ni 3 P) 358 and so on, have been synthesized by using the MA hydrothermal routes. The MA hydrothermal growth process of CuO sea urchin-like microcrystals is shown in Fig.…”

Assessment of Triboelectricity in Colossal-Surface-Area-Lanthanum Oxide Nanocrystals Synthesized via Low-Temperature Hydrothermal Process

“…Numerous techniques for synthesizing the lanthanum oxide nanoparticles have been proposed, such as thermal decomposition, homogeneous precipitation, solvothermal, hydrothermal and other chemical routes [10]. From the literature, it is shown that there are many reports on microwaveassisted hydrothermal synthesis and surfactant-assisted La 2 O 3 nanorods, nanoneedles and nanorod bundles [11] [10]. Solution phase synthesis favors the agglomeration and spherical particle formation because of its high surface energy.…”

Synthesis and photoluminescent characteristics of Sr2CeO4 phosphors prepared via a microwave-assisted solvothermal process

“…These processes can relatively lower the required temperatures for obtaining pure-phased Sr 2 CeO 4 . Other than the above-mentioned wet processes, the microwave-assisted processes such as the microwave-hydrothermal and the microwave-solvothermal methods have also been adopted for synthesizing different inorganic materials [15][16][17]. The main advantages of microwaveassisted reactions over conventional methods with respect to synthesis are enhanced reaction kinetics, rapid heating for energy conservation, and lowered synthesis temperatures for preparing nanosized particles [18].…”