Fabrication and spectral properties of Dy: SrF2 transparent ceramics
Fabrication and spectral properties of Dy: SrF2 transparent ceramics
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DOI：
10.1016/j.matchemphys.2021.125141
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发表时间：
2021-11
影响因子：
4.6
通讯作者：
C. Zheng;Zaichun Sun;Weiwei Li;Yu Yang;B. Mei
中科院分区：
文献类型：
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作者：
C. Zheng;Zaichun Sun;Weiwei Li;Yu Yang;B. Mei
采用化学共沉淀法合成了掺杂浓度为x mol%（x = 0.5，1.0，3.0，5.0，7.0，9.0）的Dy：SrF 2纳米粉体，并利用XRD和TEM对粉体的组成和形貌进行了表征。结果表明，粉体的晶粒尺寸和晶格常数呈减小趋势。采用真空热压烧结法制备了Dy：SrF 2透明陶瓷。当Dy 3+离子浓度为3.0mol%时，陶瓷在可见光波段的透过率达到86.14%。在349 nm激发下，样品在479 nm和576 nm处有两个明显的发射峰，分别对应Dy 3+离子的蓝光和黄光发射。随着掺杂量的增加，发光强度先增大后减小。随着Dy ~（3+）离子掺杂浓度从1.0 mol%增加到9.0 mol%，样品的寿命持续下降。根据CIE色度坐标，Dy：SrF 2透明陶瓷可以实现白色发光，其中Dy 3+离子掺杂浓度为7.0 mol%的SrF 2陶瓷最接近理想的白色发光。这表明Dy：SrF 2透明陶瓷是一种潜在的可见光固体激光材料。
Dysprosium-doped strontium fluoride (Dy: SrF2) nanopowders with the doping concentration of x mol% (x = 0.5, 1.0, 3.0, 5.0, 7.0, 9.0) were synthesized by chemical co-precipitation method, and the composition and morphologies of nanopowders were characterized by XRD and TEM. The results indicated that the grain size and lattice constants of the powders showed a decreasing trend. Dy:SrF2transparent ceramics were fabricated by vacuum hot pressing sintering. The transmittance of the ceramics reaches 86.14% in the visible light band while the Dy3+ion concentration is 3.0 mol%. Under the excitation of 349 nm, the two significant emission peaks located at 479 nm and 576 nm, which were corresponding to blue emission and yellow emission of Dy3+ion, respectively. The emission intensity firstly increased and then decreased with the amount of doping increasing. And the lifetimes decreased continuously with the Dy3+ion doping concentration increasing from 1.0 mol% to 9.0 mol%. According to the CIE chromaticity coordinates, Dy:SrF2transparent ceramics can achieve white light emission, and the SrF2ceramic with 7.0 mol% doping concentration of Dy3+ions was the closest to perfect white light. It demonstrates that Dy:SrF2transparent ceramics is a potential candidate for solid-state laser materials in visible band.