Photoluminescence Imaging of SiO₂@ Y₂O₃:Eu(III) and SiO₂@ Y₂O₃:Tb(III) Core-Shell Nanostructures

Abstract

We uniformly coated Eu(III)-and Tb(III)-doped yttrium oxide onto the surface of SiO 2 spheres and then characterized them by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction crystallography and UV-Visible absorption. 2D and 3D photoluminescence image map profiles were reported for the core-shell type structure. Red emission peaks of Eu(III) were observed between 580 to 730 nm and assigned to For annealed samples, Eu(III) ions were embedded at a C 2 symmetry site in Y 2 O 3 , which was accompanied by an increase in luminescence intensity and redness, while Tb(III) was changed to Tb(IV), which resulted in no green emission.

Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)‐codoped silica phosphor materials

“…The peak at 616 nm ( 5 D 0 → 7 F 2 transition) was dominant, compared with the other peaks. This suggests that the Eu(III) ions were plausibly doped at the lower symmetry sites without an inversion center . This suggests that the symmetry of the doping sites in silica matrix is low.…”

“…In the present study, luminescent Eu(III) and Tb(III) ions were codoped in a silica matrix and post-thermally treated by either slow or fast annealing. Photoluminescence (PL) profile images were obtained to fully examine the effects of these thermal treatments on the photoluminescence profiles taken at various excitation wavelengths (19,(26)(27)(28)(29)(30)(31)(32)(33)(34). The mixture of red and green colors could be controlled by adjusting the amounts of doped Eu(III) and Tb(III) ions.…”

“…The mixture of red and green colors could be controlled by adjusting the amounts of doped Eu(III) and Tb(III) ions. The emission peaks between 450 and 750 nm are associated with the 5 D 4 → 7 F J ( J = 6,5,4,3) transition of Tb(III) and the 5 D 0 → 7 F J ( J = 0,1,2,3,4) transition of Eu(III) (19,(26)(27)(28)(29)(30)(31)(32)(33)(34). This paper provides valuable information on the postthermal treatment effects for developing phosphor materials using Eu(III) and Tb(III) ions in a silica matrix.…”

Fluorescence detection of carbofuran in aqueous extracts based on dual‐emission SiO2@Y2O3:(Eu3+,Tb3+)@MIP core‐shell structural nanoparticles

“…As far as we know, the typical emissions at 544 nm and 617 nm were attributed individually to the characteristic 5 D 4 -7 F 5 transition of Tb 3+ , and the characteristic 5 D 0 -7 F 2 transition for Eu 3+ . [25] Actually, the typical emission peaks still retained the strong characteristic S1. The calculated adsorption equilibrium time of MIP for CF (4.4 min for Tb 3+ and 7.9 min for Eu 3+ ) is well in agreement to the experimental values as listed in Table S2.…”

Hydrothermal Synthesis and Optical Properties of Magneto-Optical Na3FeF6:Tb3+ Octahedral Particles

“…As shown in Figure 5a, the excitation spectra of Na 3 FeF 6 :18%Tb 3+ are measured for the emission wavelength of 592 nm. It can be observed that the excitation spectra consist of sharp and intense bands with peak positions at 355 and 375 nm along with weak bands at 280 and 320 nm, which can be assigned to the 7 F 6 → 5 L 10 , 7 F 6 → 5 G 6 , 7 F 6 → 3 H 6 and 7 F 6 → 5 D 1 transitions of the Tb 3+ , respectively [32][33][34].…”