Highly Stable K2SiF6:Mn4+@K2SiF6 Composite Phosphor with Narrow Red Emission for White LEDs
Highly Stable K2SiF6:Mn4+@K2SiF6 Composite Phosphor with Narrow Red Emission for White LEDs
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用于白光 LED 的具有窄红光发射的高度稳定 K2SiF6:Mn4 @K2SiF6 复合荧光粉
DOI：
10.1021/acsami.8b03893
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发表时间：
2018-05-30
影响因子：
9.5
通讯作者：
Wang, Jing
中科院分区：
文献类型：
--
作者：
Huang, Lin;Liu, Yong;Wang, Jing
固体发光和显示用窄谱红光荧光粉A（2）MF（6）：Mn 4+（A =碱金属离子; M = Si，Ge，Ti）的耐水性差和非绿色合成是其发展的主要挑战。本文采用一种简单、绿色的生长方法，在不使用有毒易挥发的氟化氢溶液的条件下，合成了具有优异的耐水性和高效率的均相红色发光材料K2 SiF 6：Mn 4 +@K2SiF6（KSFM@KSF）。在水中浸泡6 h后，耐水产物的发光强度保持在初始值的76%，而非耐水产物的发光强度急剧下降至11%。一个显著的结果是，在85%湿度和85 ℃下保持504小时（21天）后，所得防水产品的发射强度为初始值的80- 90%，比非防水产品的30-40%高2-3倍。提出并详细研究了这些荧光粉的表面钝化生长机制。结果表明，无毒的H_3PO_4/H_2O_2水溶液促进了KSFM表面[MnF_6]（2-）离子的释放和分解，促进了KSFM表面向KSF的转化，最终形成了均匀的KSFM@KSF复合结构。这种复合结构策略也成功地用于处理其他方法制备的KSFM荧光粉。我们相信，本论文的研究结果将为大规模环境友好地合成用于白色发光二极管的抗湿窄红光A（2）MF（6）：Mn 4+荧光粉开辟道路。
Poor water resistance and nongreen synthesis remain great challenges for commercial narrow red-emitting phosphor A(2)MF(6):Mn4+ (A = alkali metal ion; M = Si, Ge, Ti) for solid-state lighting and display. We develop here a simple and green growth route to synthesize homogeneous red-emitting composite phosphor K2SiF6:Mn4+@K2SiF6 (KSFM@KSF) with excellent water resistance and high efficiency without the usage of toxic and volatile hydrogen fluoride solution. After immersing into water for 6 h, the as-obtained water-resistant products maintain 76% of the original emission intensity, whereas the emission intensity of non-water-resistant ones steeply drops down to 11%. A remarkable result is that after having kept at 85% humidity and at 85 degrees C for 504 h (21 days), the emission intensity of the as-obtained water-resistant products is at 80-90%, from its initial value, which is 2-3 times higher than 30-40% for the non-water-resistant products. The surface deactivation-enabled growth mechanism for these phosphors was proposed and investigated in detail. We found that nontoxic H3PO4/H2O2 aqueous solution promotes the releasing and decomposition of the surface [MnF6](2-) ions and the transformation of the KSFM surface to KSF, which finally contributes to the homogeneous KSFM@KSF composite structure. This composite structure strategy was also successfully used to treat KSFM phosphor prepared by other methods. We believe that the results obtained in the present paper will open the pathway for the large-scale environmentally friendly synthesis of the excellent antimoisture narrow red-emitting A(2)MF(6):Mn4+ phosphor to be used for white light-emitting diode applications.