Solvothermal synthesis of columnar Gd₂O₂S:Eu³⁺ and a comparative study with columnar Gd₂O₃:Eu³⁺

Abstract

Columnar Gd2O2S:Eu3+ nanophosphors have been synthesized through solvothermal reaction and subsequent calcination process. The structure, morphology, and luminescence properties of samples were investigated via X‐ray diffraction (XRD), Fourier transform infra‐red (FT‐IR) spectra, UV‐vis absorption spectra, field emission scanning electron microscope (FE‐SEM), and photoluminescence (PL) spectra. The Judd‐Ofelt (J‐O) parameters of Gd2O2S:Eu3+ nanophosphors with different doping concentration were calculated by emission spectra to understand the symmetry, coordination environment, and luminescence behavior of Eu3+ ions in Gd2O2S matrix. In addition, the luminescence properties of columnar Gd2O2S:Eu3+ and Gd2O3:Eu3+ were compared in detail. The comparison results show that there are subtle differences in luminescence intensity, main peak position, luminescence color, and fluorescence lifetime between them, which are closely related to their different substrate's structure, including the band‐gap energy, crystallinity, and symmetry, etc.

A Comparative Study of SiO2:Tb3+@Gd2O3:Eu3+ and Its Inverted Tb3+-Eu3+ Core–Shell Phosphors

“…After calcination at 900 °C, the spherical morphology of the precursor remains unchanged; however, their sizes decrease to about 374 nm (Figure c). The shrinkage may be attributed to the further thermal decomposition of the overlying layer and the formation of a more compact Gd 2 O 3 layer. , …”

“…The shrinkage may be attributed to the further thermal decomposition of the overlying layer and the formation of a more compact Gd 2 O 3 layer. 6,37 Figure 4a shows a contrast between the black edges and the bright interior due to the different electron penetrability of the cores and shells, further demonstrating the successful preparation of the core−shell sample. Figure 4b clearly displays the lattice fringes of the sample at higher magnification, 38 indicating good crystallinity and interplanar distance of 0.272 and 0.311, corresponding to the (4 0 0) and (2 2 2) crystallographic planes of Gd 2 O 3 , respectively.…”

An Overview of Gadolinium-Based Oxide and Oxysulfide Particles: Synthesis, Properties, and Biomedical Applications

“…Another advantage of gadolinium oxide material is the possibility of obtaining gadolinium oxysulfide phosphors by using them as precursors in a solid-state sulfidation reaction [45]. Gadolinium oxysulfide shares some properties with its precursors, such as high thermal and chemical stability, insolubility in water, and high absorption of light [46]. However, some properties are enhanced with respect to other materials.…”

Systematic synthesis of (Gd1−xLax)2O2SO4:Tb3+ and (Gd1−xLax)2O2S:Tb3+ nanophosphors for remarkably enhanced luminescence

“…12,13 Though the resulted powder has a high crystallinity because of its micron-sized large particles, contamination by alien cations and anions is hardly evitable. Treating a precursor with a sulfur-bearing gas 14,15 or combustion with thiourea as the fuel 16 may produce finer powders, but phase/chemical purity control is a frequent problem. Furthermore, the above methods all involved sulfur-containing toxic reactant and/or exhaust gas.…”