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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Quantitative Measurements of the pH-Sensitive Quantum Yield of Fluorophores in Mesoporous Silica Thin Films Using a Drexhage-Type Experiment
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Quantitative Measurements of the pH-Sensitive Quantum Yield of Fluorophores in Mesoporous Silica Thin Films Using a Drexhage-Type Experiment

机译：使用Drexhage型实验的介孔二氧化硅薄膜荧光团PH敏感量子产率的定量测量

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The photoluminescence quantum yield characterizes the performance of emitters for applications in optical devices, as reporters or probes in material and analytical sciences, and for sensing applications. Quantum yield measurements are challenging for luminescent molecules and nanocrystals immobilized in thin films for many sensor applications, particularly if spatially resolved quantitative luminescence information is desired. We show here that a Drexhage-type experiment, where a silver-coated millimeter-sized sphere is used to modify the local density of states, can provide an elegant approach to counter this challenge. As a representative example of the potential of this method, we measure the pH-dependent photoluminescence quantum yield of fluorescein isothiocyanate bound to a thin mesoporous silica film. The results were compared with those of the studies on the pH dependence of the same dye in solution. We found that our approach can link single fluorophore studies to ensemble measurements and pave the way for the spatially resolved fluorescence measurements of ultralow concentrations of emitters utilized as optically active elements and reporters in thin sensor films or incorporated into membranes.
机译：光致发光量子产量表征发射器在光学器件中的应用的性能，作为材料和分析科学中的记者或探针，以及用于传感应用。量子产率测量对于在许多传感器应用中固定在薄膜中的发光分子和纳米晶体的挑战，特别是如果需要空间分辨的定量发光信息。我们在这里展示了一种Drexhage型实验，其中银色毫米尺寸球体用于改变状态的局部密度，可以提供优雅的反击这一挑战方法。作为该方法的潜力的代表性实例，我们测量荧光素异硫氰酸酯的pH依赖性光致发光量子产率与薄的介孔二氧化硅膜结合。将结果与研究溶液中相同染料的pH依赖性的研究进行比较。我们发现我们的方法可以将单一荧光团研究链接到集合测量，并为空间分辨的发射器的空间分辨荧光测量铺设，以薄的传感器膜中的光学活性元素和记者掺入膜中。

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