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- Title
Na<sub>3</sub>Gd(VO<sub>4</sub>)<sub>2</sub>: Yb<sup>3+</sup>/(Er<sup>3+</sup>, Tm<sup>3+</sup>, Ho<sup>3+</sup>) and Na<sub>3</sub>Gd(VO<sub>4</sub>)<sub>2</sub>: Yb<sup>3+</sup>/Er<sup>3+</sup>/(La<sup>3+</sup>, Lu<sup>3+</sup>, Y<sup>3+</sup>): upconversion luminescence and temperature sensitivity under single- and multi-wavelength excitation.
- Authors
Li, Na; Yang, Bowen; Guo, Linna; Li, Tiesheng
- Abstract
It is a crucial factor for enhancing upconversion luminescence (UCL) by doping different metals under irradiation. In this article, a series of Na3Gd(VO4)2:Ln3+ (NGVO:Ln3+) were prepared by sol–gel means with citrate and characterized using X-ray diffraction. Their UCL properties were systematically investigated. A wide multi-colour emission corresponding to different Ln3+ (Yb3+/Er3+/Tm3+/Ho3+) doping was obtained under single-wavelength excitation. It is worth pointing out that among all the studied samples, only the UCL intensity of NGVO:15%Yb3+/2%Er3+ was 1.74 times more than that of the sum under the excitation at 980 and 1550 nm due to the synergistic effect under simultaneous 980 and 1550 nm excitation. Interestingly, a higher Sa (5.54 × 10−3 K−1) for NGVO:15%Yb3+/2%Er3+ excited at 1550 nm could be obtained, which had an advantage over that at 980 nm excitation. The possible energy transfer mechanism of NGVO:15%Yb3+/2%Er3+ under single- and multi-wavelength excitation was also discussed in detail using an energy level diagram. To further improve the UCL intensity, NGVO:15%Yb3+/2%Er3+ doped with other rare-earth ions (La3+/Lu3+/Y3+) were synthesized, and their UCL intensity and Sa values were also improved to a certain extent.
- Publication
Bulletin of Materials Science, 2023, Vol 46, Issue 4, p1
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-023-03058-3