HF-Free Hydrothermal Route for Synthesis of Highly Efficient Narrow-Band Red Emitting Phosphor K2Si1‿i>xF6:xMn4+ for Warm White Light-Emitting Diodes

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• 作者：Lin Huang ; Yiwen Zhu ; Xuejie Zhang ; Rui Zou ; Fengjuan Pan ; Jing Wang ; Mingmei Wu
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：March 8, 2016
• 年：2016
• 卷：28
• 期：5
• 页码：1495-1502
• 全文大小：453K
• ISSN：1520-5002

文摘

With superior photoluminescent properties, the recently discovered A₂MF₆: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 A₂MF₆:Mn⁴⁺ to be synthesized in large scale toward white LED industry adoptions.