Core–shell metal fluoride nanoparticles via fluorolytic sol–gel synthesis – a fast and efficient construction kit
Core–shell metal fluoride nanoparticles via fluorolytic sol–gel synthesis – a fast and efficient construction kit
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DOI：
10.1039/c7tc01599b
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发表时间：
2017-06
影响因子：
6.4
通讯作者：
Benjamin S. Ritter;P. Haida;T. Krahl;G. Scholz;E. Kemnitz
中科院分区：
文献类型：
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作者：
Benjamin S. Ritter;P. Haida;T. Krahl;G. Scholz;E. Kemnitz
本发明提供了一种高效、快速且容易的构建试剂盒，其使用在室温下的稀土掺杂的碱土氟化物核-壳纳米颗粒的氟解溶胶-凝胶合成，能够在一批中合成数百克至千克的核-壳颗粒。我们展示了能量传递核壳系统的有效设计方法。未掺杂的金属氟化物壳严格地将发光核与周围的溶剂屏蔽，从而导致更高的量子产率、更长的激发态寿命，以及最终更明亮的发光。较重的SrF 2保护发光核心免受周围溶剂的影响，比轻的CaF 2有效三倍。从核到壳的能量传递过程比反之更有效，因此，吸收核比吸收壳更有效。这些材料在制备透明可调谐发光材料中的应用展示了在不同的激发波长下显示不同的发光颜色。
An efficient, fast and easy construction kit using the fluorolytic sol–gel synthesis of rare-earth-doped alkaline earth fluoride core–shell nanoparticles at room temperature is presented, capable of synthesizing several hundred grams to kilograms of core–shell particles in one batch. We show ways for an effective design of energy transfer core–shell systems. Undoped metal fluoride shells rigorously shield a luminescent core from the surrounding solvent, resulting in higher quantum yields, longer lifetimes of the excited states, and finally a brighter luminescence. The heavy SrF2 shields a luminescent core from the surrounding solvent three times more effectively than the light CaF2. Energy transfer processes from core to shell are more efficient than vice versa, and hence, absorbing cores are more effective than absorbing shells. The application of these materials in the preparation of transparent tunable luminescent materials showing different luminescence colours upon different excitation wavelengths is demonstrated.