A facile in situ surface-coating passivation strategy for improving the moisture resistance of Mn4+-activated fluoride red phosphor
A facile in situ surface-coating passivation strategy for improving the moisture resistance of Mn4+-activated fluoride red phosphor
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一种简便的原位表面涂层钝化策略，可提高 Mn4 激活氟化物红色荧光粉的耐湿性
DOI：
10.1016/j.ceramint.2020.05.044
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发表时间：
2020-08
影响因子：
5.2
通讯作者：
Fang Minghao
中科院分区：
文献类型：
--
作者：
Yu Haojun;Wang Baochen;Bu Xiaoya;Liu Yan-gai;Chen Jian;Huang Zhaohui;Fang Minghao
Mn ~（4+）激活的氟化物由于其优异的发光性能成为无机红色荧光粉的研究热点。然而，这些材料的耐水性差严重阻碍了它们在宽色域（CG）背光显示和暖白色固态照明领域的应用。在此，我们提出了一种绿色、简便的方法，即，用草酸（H2 C2 O 4）溶液处理，构建均匀的Mn 4 +-稀土表面壳层，以提高K2 GeF 6：Mn 4+（KGF）红色荧光粉的耐水性能。KGF（T-KGF）荧光粉的防潮性能得到显著提高，但其发光性能没有明显变化。进一步分析了T-KGF具有优异耐水性的原因，并提出了Mn ~（4+）表面壳层的形成机理。结果表明，在固液平衡过程中，Mn ~（4+）-稀土表面壳层原位沉积在T-KGF核上。在使用经处理的T-KGF红色荧光粉时，高性能白色发光二极管（WLED）具有Ra为86.3，相关色温（CCT）为3824 K，对于WLED 2和CSCCG，高发光效率（LE）为152.37 lm/W（120.1%的REC标准和89.7%的Rec.2020标准）和103.12 lm/W的高LE。这些结果表明，所提出的简易策略可能会打开一个新的机会，以促进锰激活的氟化物荧光粉的商业化。
Mn4+-activated fluorides have become a research hotspot in the community of inorganic red phosphors owing to their fascinating luminescent properties. However, the poor water resistance of these materials severely hinders their application in the fields of wide color gamut (CG) backlight display and warm white solid-state lighting. Herein, we propose a green, facile method,i.e., treatment with oxalic acid (H2C2O4) solution, for constructing a homogeneous Mn4+-rare surface shell layer to improve the water-resistant property of K2GeF6:Mn4+(KGF) red phosphor. The moisture-resistant property of the treated KGF (T-KGF) phosphor was significantly enhanced; however, no significant change was observed in its luminescent properties. Furthermore, the reasons for the excellent water resistance of T-KGF were investigated in detail, and the formation mechanism of Mn4+-rare surface shell layer was proposed simultaneously. Results indicated that the Mn4+-rare surface shell layer wasin situdeposited on the T-KGF core during the solid-liquid equilibrium process. Upon employing the as-treated T-KGF red phosphor, high-performance white light-emitting diode (WLED) withRaof 86.3, correlated color temperature (CCT) of 3824 K, high luminous efficiency (LE) of 152.37 lm/W for WLED2 and an ultrahigh CG (120.1% NTSC standard and 89.7% Rec. 2020 standard) and high LE of 103.12 lm/W for WLED3 were achieved. These results demonstrate that the proposed facile strategy may open a new opportunity to promote the commercialization of Mn4+-activated fluoride phosphors.
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影响因子：
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