Fabrication and photoluminescence properties of TiO₂:Eu³⁺ microspheres with tunable structure from solid to core–shell

Abstract

The structure of TiO2:Eu3+ microspheres can be tuned from solid to core–shell only by changing the amount of ethanol. In addition, the PL intensity of Eu3+ ions is related to the structure of the microspheres.

Preparation of Eu(iii) acetylacetonate-doped well-defined titania particles with efficient photoluminescence properties

“…The crystal phase transition can be induced by simple calcination, and thus, there are a variety of reports on the effects of calcination temperature on the crystal phase and the resulting luminescence properties. [8][9][10][11][12][13][14][15] It should be noted that calcination results in an atomic rearrangement when crystal growth happens. The doped rare earth ions are then pushed out from the titania matrix to the surface of crystallites, causing aggregation and decreasing luminescence intensity.…”

Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation

“…time of PEO, indicating that the symmetry of Eu 3+ ions does not change much with its concentration [46]. High value of the asymmetric ratio of vacancies and causes the lattice distortion, thus changing the site symmetry of the Eu 3+ ions sites from the exact D 2d symmetry to lower site symmetry [47]. Weak PL emission bands at 653 nm and 701 nm are due to forbidden 5 D 0 → 7 F 3 and electric dipole allowed 5 D 0 → 7 F 4 transitions, respectively.…”

Solution-Based Deposition of Transparent Eu-Doped Titanium Oxide Thin Films for Potential Security Labeling and UV Screening

“…For example, one can easily alter the bandgap, recombination rate of electron-hole pairs, conductivity and optical properties of prepared films [ 13 ]. Among different ions, europium element is a well-studied activator for the preparation of red-emitting optical materials [ 14 , 15 ]. L. Song and coauthors [ 16 ] showed that Eu-doped TiO 2 nanotubes exhibited high photocatalytic activity under visible light illumination compared to a commercial P25 TiO 2 powder.…”