Journal
JOURNAL OF ADVANCED CERAMICS
Volume 10, Issue 4, Pages 843-851Publisher
SPRINGER
DOI: 10.1007/s40145-021-0478-x
Keywords
phosphors; scheelite structure; luminescence property; anion substitution
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Funding
- National Natural Science Foundations of China [51872269, 51672257]
- Fundamental Research Funds for the Central Universities [2652018305, 2652017335]
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Novel scheelite structures of fluorescent materials were successfully prepared using a high-temperature solid-phase process. Tests revealed that certain phosphors showed good luminescence properties and could be used in the fabrication of LED devices.
Novel scheelite structures of Li2Ca(WO4)(2), Li2Ca2(WO4)(SiO4), and LiCa2(WO4)(PO4) fluorescent materials were successfully prepared using a high-temperature solid-phase process. The compounds were characterized by X-ray diffraction and energy dispersive spectroscopy. The tests revealed that the substitution of [WO4](2-) by [SiO4](4-) or [PO4](3-) tetrahedron in tungstate had no significant influence on the crystal structure of the Li2Ca(WO4)(2). When Dy3+ ions were introduced as an activator at an optimum doping concentration of 0.08 mol%, all of the as-prepared phosphors generated yellow light emissions, and the emission peak was located close to 576 nm. Replacing [WO4](2-) with [SiO4](4-) or [PO4](3-) tetrahedron significantly increased the luminescence of the Li2Ca(WO4)(2) phosphors. Among them, the LiCa2(WO4)(PO4):0.08Dy(3+) phosphor had the best luminescence properties, decay life (tau = 0.049 ms), and thermal stability (87.8%). In addition, the as-prepared yellow Li2Ca(WO4)(2):0.08Dy(3+), Li2Ca2(WO4)(SiO4):0.08Dy(3+), and LiCa2(WO4)(PO4):0.08Dy(3+) phosphor can be used to fabricate white light emitting diode (LED) devices.
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