Fabrication and spectral properties of Ho-doped calcium fluoride transparent ceramics

Wan, Zizhen; Li, Weiwei; Mei, Bingchu; Liu, Zuodong; Yang, Yu

doi:10.1016/j.jlumin.2020.117188

Cited by 23 publications

(4 citation statements)

References 33 publications

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“…The peaks shown in the XRD pattern (Figure 7(b)) were consistent with the peaks of standard calcium fluoride (PDF#35-0816) and calcium carbonate (PDF#05-0586). The plane index of calcium fluoride was 111, 220, 311, 400 and 331 in turn, consistent with the research results obtained by Liu and Wan et al (Wan et al 2020;Liu et al 2022). Wang et al (Wang et al 2021) also reported two types of peaks representing calcium fluoride and calcium carbonate in the precipitate.…”

Section: Discussionsupporting

confidence: 89%

Efficient recovery of highly pure CaF2 from fluorine-containing wastewater using an icy lime solution

Cao,

Li,

et al. 2024

Water Science &Amp; Technology

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Developing a feasible and low-cost strategy for the recovery of calcium fluoride efficiently from fluoride-containing wastewater is very essential for the recycle of fluoride resources. Herein, a modified lime precipitation method was employed to recover CaF2 from fluorinated wastewater using a special icy lime solution. Intriguingly, the highest F– removal was greater than 95% under the optimal condition, leaving a fluoride concentration from 200 to 8.64 mg/L, while the lime dosage was much lower than that of industry. Importantly, spherical-shaped CaF2 particles with a 93.47% purity and size smaller than 600 nm were recovered, which has a high potential for the production of hydrofluoric acid. Besides, the precipitation was significantly affected by Ca/F molar ratio, stirring time, temperature, and solution pH. Furthermore, the thermodynamics and kinetics were investigated in detail to reveal the crystallization process. As a result, the defluorination reaction followed the pseudo-second order reaction kinetics model. Also, CO2 in the air adversely influenced the CaF2 purity. Based on this facile method, a high lime utilization efficiency was applied to defluorination, which contributed to protecting the environment and saving costs. This study, therefore, provides a feasible approach for the green recovery of fluorine resources and has significance for related research.

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Section: Discussionsupporting

confidence: 89%

Efficient recovery of highly pure CaF2 from fluorine-containing wastewater using an icy lime solution

Cao,

Li,

et al. 2024

Water Science &Amp; Technology

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“…A weak emission at 1196 nm corresponds to 5 I 6 → 5 I 8 , whose Ho-concentration dependence is not evident, but there is a steady increase in the 2046 nm emission intensity with the increases in Ho concentration. The 2046 nm broadband emission of Ho 3+ has a wide range of applications, such as in infrared lasers [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations

et al. 2022

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In most inorganic phosphors, increasing the concentration of activators inevitably causes the concentration quenching effect, resulting in reduced emission intensity at a high level of activator doping and the conventional practice is to limit the activator concentration to avoid the quenching. In contrast, SiAlON ceramics preserve their chemical composition over a very wide range of doping of activator ions, which favors the adjustment and optimization of the luminescence properties avoiding concentration quenching. Here, we investigate the photoluminescence properties of Ho-doped SiAlON (Ho-SiAlON) ceramics phosphors prepared by the hot-press method. Ho-SiAlON ceramics show strong green visible (554 nm) as well as infrared (2046 nm) broadband downshifting emissions under 348 nm excitation. It is shown that there is no concentration quenching, even at a very high level of Ho doping. The emission intensity of the 554 nm band increased two-fold when the Ho concentration is doubled. The results show that the Ho-SiAlON ceramics can be useful for efficient green phosphors.

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“…At ultraviolet wavelength range, the 3 at.% Yb 3+ : Ca0.5Sr0.5F2 transparent ceramic possessed the highest in-line transmittance, which might have been caused by the absence of impurities and fewer micropores in the ceramic. However, a significant transmittance loss was observed at the ultraviolet wavelength range similar to the CaF2 and SrF2 transparent ceramics [26,27], which might have been caused by fewer micro-obturator pores existing in the sample. When the size of the scattering source was much smaller than the wavelength of the incident light, the scattering intensity and the incident light wavelength conformed to Rayleigh's law of scattering [28]:…”

Section: δ𝑟 = R − R Rmentioning

confidence: 93%

Synthesis and Optical Characterizations of Yb3+: CaxSr1−xF2 Transparent Ceramics

Ling

Mei

et al. 2021

Crystals

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In this study, 3 at.% Yb3+: CaxSr1−xF2 nanopowders were synthesized via the chemical co-precipitation method. Highly transparent 3 at.% Yb3+: CaxSr1−xF2 ceramics with various CaF2 concentrations were fabricated by hot-pressed sintering. The 3 at.% Yb3+: CaxSr1−xF2 nanopowders exhibited a spherical shape with slight agglomeration, and their particle size ranged from 26 nm to 36 nm. With an increase of the CaF2 concentration, the peak shape changed significantly and the width of the emission band increased inhomogeneously. The minimal fluorescence lifetime at the wavelength of 1011 nm of 3 at.% Yb3+: CaxSr1−xF2 transparent ceramics with various CaF2 concentrations was higher than 3.25 ms, which was longer than that of the 3 at.% Yb3+: CaF2 (2.6 ms) and the 3 at.% Yb3+: SrF2 (3.22 ms) reported in previous literature. The results indicate that incorporating Ca2+ ions into the SrF2 is an effective method to modulate the optical properties of transparent ceramics.

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Fabrication and spectral properties of Ho-doped calcium fluoride transparent ceramics

Cited by 23 publications

References 33 publications

Efficient recovery of highly pure CaF2 from fluorine-containing wastewater using an icy lime solution

Efficient recovery of highly pure CaF2 from fluorine-containing wastewater using an icy lime solution

Ho-SiAlON Ceramics as Green Phosphors under Ultra-Violet Excitations

Synthesis and Optical Characterizations of Yb3+: CaxSr1−xF2 Transparent Ceramics

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