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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Upconversion improvement by the reduction of Na+-vacancies in Mn2+ doped hexagonal NaYbF4: Er3+ nanoparticles
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Upconversion improvement by the reduction of Na+-vacancies in Mn2+ doped hexagonal NaYbF4: Er3+ nanoparticles

机译：通过减少Mn2 +掺杂的六角形NaYbF4：Er3 +纳米颗粒中的Na +空位来改善上转换

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摘要

Hexagonal-phase NaYbF4:Er3+ upconversion nanoparticles (UCNPs) have been synthesized via a co-precipitation method in high-boiling-point solvents, and remarkably enhanced upconversion luminescence, particularly in red emission bands (650-670 nm) in NaYbF4:Er3+ UCNPs, has been achieved by Mn2+ doping. The underlying reason for luminescence enhancement by Mn2+ doping is explored by a series of controlled experiments, and a mechanism of enhancement based on the decrease of Na+-vacancies and organic adsorption is proposed. The Mn2+ substitution disturbs the equilibrium of the charge and crystal lattice in the hexagonal-phase NaYbF4:Er3+ UCNPs, which makes the Na+-vacancies that quenched luminescence become filled with Na+ or Mn2+ to offset the imbalance of the charge and electron cloud distortion. In addition, the Mn2+ doping at the surface of UCNPs could reduce the organic adsorption on the surface of the UCNPs by an extra F- ion on the grain surface resulting in luminescence enhancement. Therefore, the Mn2+-doping approach provides a facile strategy for improvement of luminescence, which will impact on the field of bioimaging based on UCNP nanoprobes.
机译：六方相NaYbF4：Er3 +上转换纳米粒子（UCNPs）已通过共沉淀法在高沸点溶剂中合成，并显着增强了上转换发光，特别是在NaYbF4：Er3 + UCNPs的红色发射带（650-670 nm）中。通过Mn 2+掺杂已经实现。通过一系列受控实验探索了Mn2 +掺杂增强发光的根本原因，并提出了一种基于Na +空位减少和有机吸附的增强机理。 Mn2 +取代干扰了六方相NaYbF4：Er3 + UCNPs中电荷和晶格的平衡，这使得淬灭发光的Na +空位充满了Na +或Mn2 +，以抵消电荷的不平衡和电子云畸变。另外，UCNPs表面的Mn2 +掺杂可通过晶粒表面多余的F-离子减少UCNPs表面的有机吸附，从而增强发光。因此，Mn2 +掺杂方法提供了一种提高发光效率的简便策略，这将影响基于UCNP纳米探针的生物成像领域。

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