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Luminescence enhancement and quenching by codopant ions in lanthanide doped fluoride nanocrystals

机译:镧系元素掺杂的氟化物纳米晶体中的共掺杂离子增强发光和猝灭

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摘要

Luminescence enhancement (LE) and quenching for lanthanide (Ln) doped nanocrystals is obtained by a second Ln~(3+) ion doping method. Singly or doubly doped LaOF, LaF_3 and NaYF_4 nanocrystals are studied in detail under selective or two-color excitations. The underlying reason for LE by codoping is explored, and a mechanism of the enhancement based on the low local point symmetry effect of the matrix is proposed. It is found that the modification of the local environment induced by dopant ions can result in LE if the non-radiative relaxation probability can be ignored. The observations reported here should be useful for improving the quality of Ln ~(3+) doped nanomaterials.
机译:通过第二次Ln〜(3+)离子掺杂方法获得了掺杂镧系元素(Ln)的纳米晶体的发光增强(LE)和猝灭。在选择性或双色激发下详细研究了单掺杂或双掺杂的LaOF,LaF_3和NaYF_4纳米晶体。探究了共掺杂导致LE的根本原因,并提出了一种基于矩阵低局部对称性效应的增强机制。可以发现,如果可以忽略非辐射弛豫概率,则由掺杂离子引起的局部环境的改变会导致LE。此处报道的观察结果对于提高Ln〜(3+)掺杂纳米材料的质量应该是有用的。

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