Abstract
The La1−xEuxVO4 (0 ≤ x, y ≤ 0.3) and La1−x−yEuyCaxVO4 (0 ≤ x, y ≤ 0.2) nanoparticles were synthesized by various methods and investigated. Phase composition of the sample depends on the x, y values. The La1-xEuxVO4 can be crystallized in monoclinic structure up to x = 0.1 or x = 0.05 depending on the method of synthesis. The La0.9Eu0.05Ca0.05VO4 sample was also attributed to the monoclinic structure. Increasing concentration of europium and calcium ions in La1−x−yEuyCaxVO4 solid solutions leads to the change of the crystal structure and subsequently stabilization of the tetragonal phase takes place. The obtained samples were characterized by XRD analysis, SEM microscopy, and IR spectroscopy. Luminescence properties of the synthesized powders were studied. Emission of all the La1−xEuxVO4 and La1−x−yEuyCaxVO4 samples consists of narrow spectral lines in the 550 – 730 nm spectral range. The lines are caused by the 5D0 → 7FJ electron transitions in the Eu3+ ions. The Ca2+ ions incorporation increases intensity of the Eu3+ ions luminescence. The structure of the spectra depends on Ca2+ concentration and excitation wave length. The carried out analysis has revealed that Eu3+ ions form at least two different types of emission centers in the La1−x−yEuyCaxVO4 samples. The assumption is made that type I centers are formed by the Eu3+ ions in their regular positions in the crystal lattice, while the type II centers have complex structure and consist of Eu3+ ions, Ca2+ cations, and oxygen vacancies. It is established that Ca-induced defects are also responsible for additional excitation band near 400 nm.
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Abbreviations
- IR:
-
Infra Red
- PL:
-
Photo Luminescence
- RE:
-
Rare Earth
- SEM:
-
Scanning Electron Microscopy
- UV:
-
Ultra Violet
- XRD:
-
X-Rays Diffraction
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This project has received funding from Ministry of Education and Science of Ukraine and from the EU-H2020 research and innovation program under grant agreement No 654360 having benefited from the access provided by Institute of Electronic Structure & Laser (IESL) of Foundation for Research & Technology Hellas (FORTH) in Heraklion, Crete, Greece within the framework of the NFFA-Europe Transnational Access Activity.
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Chukova, O.V. et al. (2019). Structure, Morphology, and Spectroscopy Studies of La1−xRExVO4 Nanoparticles Synthesized by Various Methods. In: Fesenko, O., Yatsenko, L. (eds) Nanocomposites, Nanostructures, and Their Applications. NANO 2018. Springer Proceedings in Physics, vol 221. Springer, Cham. https://doi.org/10.1007/978-3-030-17759-1_15
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