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Fabrication, characterization, and luminescent properties of Y2WO6: Gd3+, Dy3+ hierarchical microspheres
- Source :
- Journal of Materials Science: Materials in Electronics. 30:4393-4399
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
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 :
- 010302 applied physics
Photoluminescence
Materials science
Scanning electron microscope
Analytical chemistry
Nanoparticle
Condensed Matter Physics
medicine.disease_cause
01 natural sciences
Atomic and Molecular Physics, and Optics
Hydrothermal circulation
Electronic, Optical and Magnetic Materials
Ion
0103 physical sciences
medicine
Thermal stability
Electrical and Electronic Engineering
Luminescence
Ultraviolet
Subjects
Details
- ISSN :
- 1573482X and 09574522
- Volume :
- 30
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science: Materials in Electronics
- Accession number :
- edsair.doi...........7065459a08564ea5f0db5fe5b47bdf64