The NIR emitting nanoparticles obtained by surface modification of Yb³⁺ or Dy³⁺ doped LaF₃ with aromatic carboxylate anions were studied. The NIR luminescence of dysprosium fluoride nanoparticles surface-modified with an organic ligand was demonstrated for the first time, whilst the brightness of NIR luminescence of surface modified ytterbium fluoride nanoparticles was estimated. The detailed study of the dependence of luminescence intensity as a function of Dy fraction in both bimetallic coordination compounds and bimetallic dysprosium fluorides allowed determining the optimal Dy…Dy distance to obtain the maximum luminescence intensity.

中文翻译：

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表面改性的Ln _x La _1-x F ₃（Ln = Dy，Yb）纳米粒子：朝着明亮的NIR发光

研究了通过芳族羧酸根阴离子对Yb ³⁺或Dy ³⁺掺杂的LaF ₃进行表面改性获得的发射NIR的纳米颗粒。首次展示了有机配体表面改性的fluoride氟化物纳米粒子的近红外发光，同时估算了表面改性的氟化y纳米颗粒的近红外发光亮度。通过对双金属配位化合物和双金属氟化s中发光强度与Dy分数的关系进行详细研究，可以确定最佳的Dy…Dy距离，以获得最大的发光强度。