HF-Free Hydrothermal Route for Synthesis of Highly Efficient Narrow-Band Red Emitting Phosphor K2Si1-xF6:xMn4+ for Warm White Light-Emitting Diodes
HF-Free Hydrothermal Route for Synthesis of Highly Efficient Narrow-Band Red Emitting Phosphor K2Si1-xF6:xMn4+ for Warm White Light-Emitting Diodes
复制标题
用于合成暖白光发光二极管用高效窄带红光荧光粉 K2Si1-xF6:xMn(4) 的无 HF 水热路线
DOI：
10.1021/acs.chemmater.5b04989
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发表时间：
2016-03-08
影响因子：
8.6
通讯作者：
Wu, Mingmei
中科院分区：
文献类型：
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作者：
Huang, Lin;Zhu, Yiwen;Wu, Mingmei
由于具有优异的光致发光性能，最近发现的A(2)Mf(6)：Mn4+材料具有取代商用稀土掺杂(氧)氮化物荧光粉用于固态照明和显示的潜力。本文报道了一种绿色合成路线，无需使用有毒和易挥发的HF溶液，即可合成窄红光K2SiF6：Mn4+。我们证明了K2SiF6：Mn4+是在普通低毒的H3PO4/KHF2溶液中产生的，而不是在高毒的HF溶液中产生的，并系统地研究了其形貌和发光性质。此外，还对反应机理进行了较为详细的讨论。我们发现H3PO4/KHF2不仅在稳定Mn4+和促进Mn4+进入宿主K2SiF6的过程中起着与HF相同的关键作用，而且在控制宿主K2SiF6中Mn4+的浓度方面表现出比HF更优异的能力。通过展示其在色度坐标可调和色温相关的白光发光二极管(LED)中的应用，表明我们基于低毒H3PO4/KHF2溶液体系的水热策略将为窄红光发射A(2)Mf(6)：Mn4+的大规模合成提供机会，走向白光LED的工业应用。
With superior photoluminescent properties, the recently discovered A(2)MF(6):Mn4+ material holds the potential in replacing the commercial rare-earth-doped (oxy)nitride phosphors for solid state lighting and display. We report here a green synthetic route to synthesize narrow red emitting K2SiF6:Mn4+ without the usage of toxic and volatile HF solution. We show that K2SiF6:Mn4+ is produced in common low-toxic H3PO4/KHF2 liquid instead of high-toxic HF liquid and systematically investigate its morphology and photoluminescence properties. Moreover, the reaction mechanism is comprehensively discussed in detail. We find that not only does H3PO4/KHF2 play the same key roles as HF in the process of stabilizing Mn4+ and promoting Mn4+ into the host K2SiF6, but also it exhibits more excellent ability than HF in controlling the concentration of Mn4+ ion in the host K2SiF6. By demonstrating its application in white light-emitting diode (LED) with tunable chromaticity coordinate and correlated color temperature, we show that our hydrothermal strategy based on low-toxic H3PO4/KHF2 solution system will open the opportunity for the narrow red emitting A(2)MF(6):Mn4+ to be synthesized in large scale toward white LED industry adoptions.