Citation: Jia-Wen WAN, Ling-Fang LONG, Dao-Yuan MA, Yun-Zheng LIU, Zi-Xiang WANG, Li-Bin XIA. Effect of MgF₂ on the luminescence of Mn⁴⁺-doped germanate red phosphor[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(12): 2328-2338. doi: 10.11862/CJIC.2023.193 shu

Effect of MgF₂ on the luminescence of Mn⁴⁺-doped germanate red phosphor

Jia-Wen WAN ¹ ,
Ling-Fang LONG ² ,
Dao-Yuan MA ¹ ,
Yun-Zheng LIU ¹ ,
Zi-Xiang WANG ¹ ,
Li-Bin XIA ^{1, 2, 3,,}

1.
School of Energy and Machinery Engineering, Jiangxi University of Science and Technology, Nanchang 330006, China
2.
School of Materials Science and Engineering, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
3.
Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province, Ganzhou, Jiangxi 341000, China

Corresponding author: Li-Bin XIA, tea_xia@126.com
Received Date: 20 May 2023
Revised Date: 29 October 2023

Figures(7)

3.5MgO·0.5MgF₂·GeO₂∶Mn⁴⁺ has been applied in the market as a red phosphor with excellent thermal stability and good luminescence performance. However, the unclear influence mechanism of MgF₂ in the phosphor hinders further performance optimization and development. A series of Mn⁴⁺-activated germanate phosphors were prepared by the high-temperature solid-phase method. The variation regulation of the structure, morphology, and luminescence performance was investigated by comparing the addition of MgF₂ and H₃BO₃ (flux). Then the luminescence influence role of MgF₂ has been obtained. The study showed that the optimum sintering temperatures for the samples with MgF₂, H₃BO₃, and without any co-solvent were 1 150, 1 250, and 1 350 ℃, respectively. The luminescence intensity at the above temperatures was also the optimum value, and the samples with MgF₂ and H₃BO₃ exhibited a pure phase at the temperature, respectively. The crystallinity and dispersion of the phosphors were improved by adding MgF₂ and H₃BO₃, and the positive influence of the MgF₂ was better than that of the H₃BO₃. The Dq/B value of the phosphor with MgF₂ was calculated to be 3.03, indicating Mn⁴⁺ is in an environment with a strong crystal field. The fluorescence lifetimes of the phosphors with MgF₂ and H₃BO₃ were 0.93 and 0.75 ms, respectively. The addition of MgF₂, on the one hand, plays a positive role as a co-solvent, which can be conducive to generating a pure phase and improving the crystallinity. The role is the same as the H₃BO₃. On the other hand, the F^- ions originating from MgF₂ were successfully doped into the crystal lattice confirmed by the XPS analysis, and then the crystal structure of Mg₁₄Ge₅(O, F)₂₄ was achieved.
- luminescent materials,
- MgF₂,
- H₃BO₃,
- germanate phosphor,
- flux
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Effect of MgF₂ on the luminescence of Mn⁴⁺-doped germanate red phosphor