Preparation and luminescent properties of Tb³⁺doped Y₂O₂SO₄microflakes

Abstract

Tb 3z doped Y 2 O 2 SO 4 (Y 2 O 2 SO 4 :Tb 3z ) microflakes were prepared by a combination method of electrospinning and calcination. The two-dimensional microflakes had smooth surface and high radial/axial ratio. Crystal structures of the Y 2 O 2 SO 4 :Tb 3z microflakes resulted in layer by layer growth in axial direction. A possible formation mechanism was proposed on the basis of experimental results, which indicated that poly(vinyl pyrrolidone) played the role of the nanostructure directing template and revealed the growth priority in radial direction. The microflakes showed a favourable fluorescent property symbolised by the characteristic green emission (541 nm) resulting from the 5 D 4 R 7 F 5 transition of Tb 3z ions under 229 nm ultraviolet excitation. The maximum intensity of Tb 3z emission of the Y 2 O 2 SO 4 :Tb 3z microflakes was 2?3 times stronger than that of the Y 2 O 2 SO 4 :Tb 3z bulk powders with the same doping concentration.

Structural Features of Y2O2SO4 via DFT Calculations of Electronic and Vibrational Properties

“…The Bu mode at 499.1 cm −1 is a translation of O, as shown in Figure 8f. Thus, we can conclude that the wide spectral band at 532 cm −1 in Infrared spectra is devoted to oxygen vibration in [Y2O2 2+ ] chains, but not to Y-O vibrations as was stated earlier [19,20,[31][32][33]. The assignment of remain vibrational modes is presented in Table 3.…”

“…Connection of the OY 4 tetrahedra (Figure 5) into the chains creates the [Y 2 O 2 2+ ] layers as shown in Figure 7 and vibrations of these layers have been found in Raman spectra. Spectral band at 500 cm ] chains, but not to Y-O vibrations as was stated earlier [19,20,[31][32][33]. The assignment of remain vibrational modes is presented in Table 3.…”

“…In nanometer-sized Y 2 O 2 SO 4 :Eu 3+ , the Y-O bond peak was found at 560 cm −1 [31]. In Infrared spectra of Y 2 O 2 SO 4 doped with Tb 3+ ions, characteristic spectral bands related to sulfate vibrations and the Y-O stretching (at 539 cm −1 ) were observed [20]. Spectral peak related to the stretching vibrations of O-Y was found at 545 cm −1 in Y 2 O 2 SO 4 [32]. ]…”

“…The 2-3 µm in diameter Y 2 O 2 SO 4 :Eu 3+ was synthesized using a urea-based homogeneous precipitation technique based on a urea-ammonium sulfate system [19]. The Y 2 O 2 SO 4 :Tb 3+ microflakes were prepared via an electrospinning process followed by calcination treatment [20]. The biomolecule-assisted hydrothermal route followed by calcination was used for the production of yttrium oxysulfate hollow spheres doped with Yb 3+ and Eu 3+ or Er 3+ [21].…”

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

“…Oxysulfates can also be obtained by the decomposition of organic sulfonates of various structures [18]. A direct synthesis method consists of the temperature treatment of oxides in the atmosphere of sulfur oxide (IV) and oxygen [19].…”