Lanthanide-activated Na5Gd9F32 nanocrystals precipitated from a borosilicate glass: Phase-separation-controlled crystallization and optical property
Lanthanide-activated Na5Gd9F32 nanocrystals precipitated from a borosilicate glass: Phase-separation-controlled crystallization and optical property
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DOI：
10.1016/j.jallcom.2014.11.128
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发表时间：
2015-03
影响因子：
6.2
通讯作者：
Daqin Chen;Zhongyi Wan;Yang Zhou;Yan Chen;Hua Yu;Hongwei Lu;Z. Ji;Ping Huang
中科院分区：
文献类型：
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作者：
Daqin Chen;Zhongyi Wan;Yang Zhou;Yan Chen;Hua Yu;Hongwei Lu;Z. Ji;Ping Huang
镧系元素激活的立方 Na5Gd9F32 纳米晶体是从具有专门设计成分的硼硅酸盐玻璃中沉淀出来的。前驱体玻璃在熔融淬火后已发生相分离，有利于实现可控玻璃结晶，从而获得理想的尺寸、形貌和活化剂分配。扫描透射电子显微镜中的元素图证明，镧系元素离子偏析到Na5Gd9F32晶格中是原位形成的，不需要长程离子扩散。令人印象深刻的是，这种共掺杂Yb3+/Er3+离子的玻璃陶瓷表现出强烈的上转换发光，比前驱体玻璃高出约500倍，并且通过控制玻璃结晶温度可以轻松地将其发光颜色从红色调整为绿色。预计这种对玻璃陶瓷纳米结构进行精确控制的相分离合成策略为设计具有广泛可调光学性能的其他高透明纳米复合材料提供了绝佳的机会。
Lanthanide-activated cubic Na5Gd9F32nanocrystals were precipitated from a borosilicate glass with a specifically designed composition. The precursor glass is already phase-separated after melt-quenching, which is beneficial to the realization of the controllable glass crystallization for affording desirable size, morphology and activator partition. Elemental mapping in the scanning transmission electron microscopy evidenced that the segregation of lanthanide ions into the Na5Gd9F32lattice was in situ formed without the requirement of long-range ionic diffusion. Impressively, such fabricated glass ceramic co-doped with Yb3+/Er3+ions exhibited intense upconversion luminescence, which was about 500 times higher than that of the precursor glass, and its luminescent color could be easily tuned from red to green by controlling glass crystallization temperature. It is anticipated that such phase-separation synthesis strategy with precise control over nanostructure of glass ceramics offer a great opportunity to design other highly transparent nanocomposites with a wide range of tunable optical properties.