We reported here a lead ion selective optode incorporating NaYF₄: Er,Yb upconverting nanorods, chromoionophore ETH 5418, and lead ionophore together in hydrophobic polymer matrixes. The absorption spectra of protonated and unprotonated ETH 5418 overlap the two emission peaks of the upconverting material, respectively, which allows the fluorescent ion sensing based on the inner filter effect. The proposed optodes exhibited highly selective and reproducible sensing property for measuring lead ions in the range of 10⁻⁶–10⁻² M at pH 5. Because the excitation source is 980 nm and the emission wavelength lies in the near-infrared region, the sensors have been successfully used in complex samples for example plasma with minimized background absorption and sample autofluorescence. The lead levels in sheep plasma and artificial industry wastewater samples obtained by the optode were comparable with the known addition amounts of Pb(NO₃)₂, providing a new method for testing Pb²⁺ in the industry wastewater.

我们在这里报道了在疏水性聚合物基质中结合了NaYF ₄的铅离子选择性光电二极管：Er，Yb上转换纳米棒，发色团ETH 5418和铅离子团。质子化和未质子化的ETH 5418的吸收光谱分别与上转换材料的两个发射峰重叠，这允许基于内部滤镜效应的荧光离子感测。拟议的光电二极管在测量10 ^-6 –10 ^-2范围内的铅离子时表现出高度选择性和可重现的传感特性 M在pH 5下。由于激发源为980 nm，且发射波长位于近红外区域，因此该传感器已成功用于复杂样品中，例如具有最小背景吸收和样品自发荧光的血浆。通过该光电二极管获得的绵羊血浆和人工工业废水样品中的铅含量可与已知的Pb（NO ₃）₂添加量相媲美，为测试工业废水中的Pb ²⁺提供了一种新方法。