| MgF2对Mn4+掺杂锗酸盐红色荧光粉发光的影响 | |
| Effect of MgF2 on the luminescence of Mn4+-doped germanate red phosphor | |
| 摘要: 3.5MgO·0.5MgF2·GeO2：Mn4+作为优异热稳定性和良好发光性能的红色荧光粉而被市场应用，然而，该粉体中MgF2的作用影响机理尚不明晰，阻碍其性能进一步优化和发展。采用高温固相法制备了系列Mn4+激活的锗酸盐荧光粉，通过对比加入MgF2、H3BO3（助熔剂），研究了该粉体的结构、形貌、发光性能等变化规律，阐明了MgF2的发光影响作用。研究表明，加入MgF2、H3BO3和不加任何助熔剂时的样品，其最佳烧结温度分别为1 150、1 250和1 350 ℃，上述温度下发光强度均为最佳值，其中加入MgF2、H3BO3的样品在最佳温度处生成了纯相。MgF2的添加，一方面同H3BO3一样作为助熔剂对生成纯相、提高样品结晶度起了积极的作用；另一方面，通过研究分析，确认F-离子成功掺杂进入晶格，促使样品生成的晶体结构为Mg14Ge5（O， F）24。加入MgF2、H3BO3在最佳烧结温度的样品的荧光寿命分别为0.93和0.75 ms。 | |
| 关键词: 发光材料 MgF2 H3BO3 锗酸盐荧光粉 助熔剂 | |
| 基金项目: 国家自然科学基金（No.52062017）资助 | |
| Abstract: 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. | |
| Keywords: luminescent materials MgF2 H3BO3 germanate phosphor flux | |
| 投稿时间：2023-05-20 修订日期：2023-10-29 | |
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| 万嘉文,龙林芳,马道远,刘云正,王梓祥,夏李斌.MgF2对Mn4+掺杂锗酸盐红色荧光粉发光的影响[J].无机化学学报,2023,39(12):2328-2338. | |
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