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Photoluminescent, transparent and flexible di-ureasil hybrids containing CdSe/ZnS quantum dots

机译：包含CdSe / ZnS量子点的光致发光，透明且柔性的双脲混合物

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摘要

We describe, in this paper, the sol-gel synthesis of di-ureasil based nanocomposites prepared in situ in the presence of organically capped CdSe quantum dots (QDs) or CdSe QDs which have been coated with a ZnS shell. For the latter a new chemical route to coat the CdSe QDs with ZnS shells was investigated and is now reported. The QDs became well dispersed in the final nanocomposites, whose microstructural homogeneity was evaluated by atomic force microscopy (AFM) and transmission electron microscopy (TEM) analyses. In order to understand the optical behaviour of di-ureasil containing QDs, a detailed photoluminescent study was undertaken for a selected particle size distribution of ZnS coated CdSe QDs (d similar to 4.5 nm). Emission quantum yields up to 0.11 were measured in the final nanocomposites that present a huge (between 3 and 6 orders of magnitude) increase in the lifetime of the QDs (relative to that of isolated ones), as a result of energy transfer occurring between the intimately mixed di-ureasil host and the QDs.
机译：我们在本文中描述了在有机封端的CdSe量子点（QDs）或CdSe QDs的存在下原位制备的基于双脲的纳米复合材料的溶胶-凝胶合成，该表面已被ZnS壳包覆。对于后者，研究了用ZnS壳包覆CdSe QD的新化学途径，目前已有报道。 QDs很好地分散在最终的纳米复合材料中，通过原子力显微镜（AFM）和透射电子显微镜（TEM）分析评估了其微观结构的均匀性。为了理解含双脲的QD的光学性能，对选定的ZnS包覆的CdSe QD的粒径分布进行了详细的光致发光研究（d类似于4.5 nm）。在最终的纳米复合材料中测得的发射量子产率高达0.11，这些纳米复合材料由于量子点之间的能量转移而导致量子点的寿命（相对于孤立的量子点）大幅增加（3到6个数量级）。紧密混合的双脲基质宿主和量子点。

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