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Quenching of the luminescence of upconverting luminescent nanoparticles by heavy metal ions

机译:重金属离子淬灭上转换发光纳米粒子的发光

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We report that the luminescence of upconverting luminescent nanoparticles (UCLNPs) is quenched by heavy metal ions and halide ions in aqueous solution. The UCLNPs consist of hexagonal NaYF_4 nanocrystals doped with trivalent rare earth ions and were synthesized by both the oleic acid (solvothermal) method and the ethylenediaminetetraacetic acid (co-precipitation) method. Quenching was studied for the Cu~(II), Hg~(II), Pb~(II), Cd~(II), Co~(II), Ag~I, Fe~(III), Zn~(II), bromide, and iodide ions and is found to be particularly strong for Hg~(II). Stern-Volmer plots are virtually linear up to quencher concentrations of 10-25 mM, but deviate from linearity at higher quencher concentrations, because static quenching causes an additional effect. The UCLNPs display two main emission bands (blue, green, red or near-infrared), and the quenching efficiencies for these are found to be different. The effect seems to be generally associated with UCLNPs because it was observed for all UCLNPs doped with trivalent lanthanide ions including Yb~(III), Er~(III), Ho~(III), and Tm~(III). The results are discussed in terms of quenching mechanisms and with respect to potential applications such as optical sensing.
机译:我们报告说,上转换发光纳米粒子(UCLNPs)的发光被水溶液中的重金属离子和卤化物离子淬灭。 UCLNP由掺有三价稀土离子的六角形NaYF_4纳米晶体组成,并通过油酸(溶剂热)法和乙二胺四乙酸(共沉淀)法合成。研究了Cu〜(II),Hg〜(II),Pb〜(II),Cd〜(II),Co〜(II),Ag〜I,Fe〜(III),Zn〜(II)的淬火,溴和碘离子,并被发现对Hg〜(II)特别强。直到10-25 mM的淬灭剂浓度,Stern-Volmer图实际上是线性的,但是在较高的淬灭剂浓度下,线性关系有所偏离,因为静态淬灭会产生额外的影响。 UCLNP显示两个主要的发射带(蓝色,绿色,红色或近红外),发现它们的猝灭效率不同。该作用似乎通常与UCLNP有关,因为在所有掺有三价镧系离子的UCLNP中都观察到了这种作用,包括Yb〜(III),Er〜(III),Ho〜(III)和Tm〜(III)。将根据淬灭机理并针对诸如光学传感的潜在应用来讨论结果。

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