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- Title
Fabrication, characterization, and luminescent properties of Y<sub>2</sub>WO<sub>6</sub>: Gd<sup>3+</sup>, Dy<sup>3+</sup> hierarchical microspheres.
- Authors
Rao, Wei-Feng; Guan, Yue; Yang, Jia-Yu; Huang, Qi-Qi; Miao, Ju-Hong
- Abstract
A series of monodisperse Y2WO6: Dy3+, Gd3+ hierarchical microspheres were synthesized via a facile surfactant-assisted hydrothermal method followed by heat treatment. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) spectra. XRD patterns of the samples with Gd3+ codoping exhibit a merging of (− 232) and (232) peaks, indicating the distorted deformation in Y2WO6 host structure. SEM images demonstrate that the Y2WO6: Dy3+, Gd3+ microspheres are well-dispersed and assembled by many irregular nanoparticles. Upon ultraviolet (UV) excitation at 291 nm, the emission peaks of Dy3+ ions is observed at 480 nm (blue), 579 nm (yellow) and 669 nm (red), corresponding to the characteristic transitions of 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 of Dy3+, respectively. The optimal PL intensity was obtained in Y2WO6: 2.5 mol% Dy3+ microspheres which can be further enhanced with the codoping of Gd3+. The strongest luminescence is achieved at Gd3+ concentration of 40 mol% with a quantum yied (QY) of 34.45%. In addition, the thermal stability of the sample was also investigated. The CIE of the investigated samples exhibit little change by varying the concentration of Gd3+ ions. The calculated CIE values are all around (0.37, 0.38) and located at the white region, suggesting that the Y2WO6: Dy3+, Gd3+ microspheres could be used for white LEDs.
- Subjects
LUMINESCENCE; MICROSPHERES; DOPING agents (Chemistry); NANOPARTICLES; SCANNING electron microscopes; X-ray diffraction
- Publication
Journal of Materials Science: Materials in Electronics, 2019, Vol 30, Issue 5, p4393
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-019-00728-z