NIR-II luminescence and X-ray induced UV luminescence from Ce3+, Nd3+ co-doped NaLuF4 phosphors
NIR-II luminescence and X-ray induced UV luminescence from Ce3+, Nd3+ co-doped NaLuF4 phosphors
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Ce3、Nd3 共掺杂 NaLuF4 荧光粉的 NIR-II 发光和 X 射线诱导紫外发光
DOI：
10.1016/j.jallcom.2020.158062
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发表时间：
2020-11
影响因子：
6.2
通讯作者：
Zhang Hongwu
中科院分区：
文献类型：
--
作者：
Wang Xiaodan;Li Penghui;Zheng Shenghui;Shi Junpeng;Fu Xiaoyan;Zhang Hongwu
镧系元素掺杂的无机双模发光材料具有优异的光学和物理化学性能，被认为是一种具有广阔应用前景的材料平台。采用水热法合成了Ce 3+和Nd 3+共掺杂的NaLuF 4荧光粉，实现了单颗粒在两种激发源下的紫外（UV）和第二近红外（NIR-II）双模式发光。较高的NaF/LnCl 3比不仅能促进NaLuF 4：Ce 3+，Nd 3+的晶相由立方相向六方相转变，以及纳米颗粒向微棱柱体的形状演变，而且能提高NaLuF 4：Ce 3+，Nd 3+的紫外和近红外发光性能。在X射线辐照下，Ce 3+和Nd 3+共掺杂NaLuF 4荧光粉由于Ce 3+的5d→ 4f跃迁发射而呈现出较强的宽带紫外发射。在808 nm近红外激发下，荧光粉在1060 nm和1340 nm附近产生两个近红外-Ⅱ发射峰，分别归属于Nd 3+离子的4F 3/2→ 4 I11/2和4F 3/2→ 4 I13/2电子跃迁。此外，还对Ce 3+和Nd 3+在X射线和808 nm激光激发下可能的发射和能量传递机制进行了详细的讨论。上述研究结果不仅为双模发光材料的进一步研究奠定了基础，而且为此类材料在深部组织生物成像和治疗方面的应用提供了潜在的前景。
Owning to exceptional optical and physicochemical properties, lanthanide-doped inorganic dual-mode luminescence materials are regarded as promising platform for multifunctional applications. Herein, a facile hydrothermal method is used to integrate Ce 3+ and Nd 3+ ions co-doped NaLuF 4 phosphors, achieving dual-mode with ultraviolet (UV) and the second near-infrared (NIR-II) luminescence from single particles under two excitation sources. Higher NaF/LnCl 3 ratio can not only promote the crystal phase transformation from cubic to hexagonal and the shape evolution from nanoparticles to microprisms, but also promote the UV and NIR-II luminescence properties of NaLuF 4: Ce 3+, Nd 3+ phosphors. Upon irradiation with X-ray, Ce 3+ and Nd 3+ ions co-doped NaLuF 4 phosphors exhibit strong broad band UV emission due to 5d→ 4f transition emission of Ce 3+. Under 808 nm NIR excitation, the phosphors give NIR-II emission with two peaks at around 1060 nm and 1340 nm, which are attributed to the 4 F 3/2→ 4 I 11/2 and 4 F 3/2→ 4 I 13/2 electron transitions of Nd 3+ ions respectively. Furthermore, the possible emission and energy transfer mechanism between Ce 3+ and Nd 3+ under the excitation of X-ray and 808 nm laser are discussed in details. The above results not only pave the way for future research of dual-mode luminescent materials, but also endow such materials with potential bio-applications for deep tissue bioimaging and therapy.
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