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采用改进高温热分解法合成了Cd2+掺杂NaLuF4∶Yb,Er纳米晶体,研究了Cd2+对晶相形成和发光强度的影响,采用CASTEP计算不同掺杂浓度下β-NaLuF4∶Yb,Er的形成能.在掺杂浓度为6mol;时合成的纳米晶荧光强度最强,其相较于未掺杂时增加了2.6倍,此时平均尺寸为23 nm左右.随后通过控制添加合适比例和含量的分散剂,解决了晶体易团聚的问题,得到了平均尺寸为18 nm的结晶度高、分散性好的上转换纳米晶.通过二氧化硅壳层的包覆,降低了Cd2泄露引起的毒性反应,表明在浓度较低时呈现出低毒性,满足了上转换纳米晶在医用材料领域应用的要求. 相似文献
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According to the conjecture based on some known facts of integrable
models, a new (2+1)-dimensional supersymmetric integrable bilinear
system is proposed. The model is not only the extension of the known
(2+1)-dimensional negative Kadomtsev--Petviashvili equation but also
the extension of the known (1+1)-dimensional supersymmetric
Boussinesq equation. The infinite dimensional Kac--Moody--Virasoro
symmetries and the related symmetry reductions of the model are
obtained. Furthermore, the traveling wave solutions including
soliton solutions are explicitly presented. 相似文献
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