Structure and photoluminescent properties of TiO2:Eu3+ nanoparticles synthesized

Authors:
A.Yu. Zavialova, A. N. Bugrov, R.Yu. Smyslov, D. A. Kirilenko, T.V. Khamova, G. P. Kopitsa, C. Licitra, D. Rouchon
The year of the publication:
2019
Journal:
NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS N 3 vol. 10 361 - 373
Keywords:
hydrothermal synthesis, titania, europium, solid solution, anatase, rutile, nanophosphors, photoluminescence, fluorescence lifetime
Abstract:

Crystalline phosphors of Eu3+-doped titania (TiO2:Eu3+) were prepared by hydro and solvothermal synthesis with luminescent ion concentration of 2 mol.%. The structure and shape of the synthesized nanoparticles were characterized using X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy. Changes in the emission, excitation spectra, and the intensity decay of the photoluminescence for TiO2:Eu3+ nanoparticles were analyzed their phase composition. The photoluminescence of synthesized TiO2:Eu3+ crystalline phosphors depends on whether the said nanophosphors are formed from organometallic or inorganic precursors under hydro- and solvothermal conditions. Indeed, photoluminescence excitation at wavelengths ranging from 350–550 nm leads to splitting of electron dipole transitions into Stark components according to the symmetry of the Eu3+ surroundings. Also, both nanoparticles with the anatase structure and phosphors predominantly containing rutile showed very short photoluminescence lifetimes.

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