Metal–organic framework (MOF) based light harvesting has been attracting considerable attention as an artificial antenna for photochemical and photophysical applications. Herein, we report the photoluminescence enhancement of semiconductor quantum dots (QDs) via efficient energy transfer from a light-harvesting framework (IRMOF-3) surrounding each QD as a surface modifier. IRMOF-3 crystals were directly grown on the surface of QDs without any intermediate layer such as polymers. The observed photoluminescence enhancement owing to the light harvesting of IRMOF-3 was confirmed by both steady-state excitation spectra measurement and fluorescence lifetime measurement. The phenomenon was observed at the wavelength region where IRMOF-3 had high absorbance. On the basis of the Förster distance (R₀) between the donor and acceptor, the volumetric factor of IRMOF-3 from which the excitation energy was transferred to QDs was estimated. We experimentally demonstrated that the energy transfer efficiency was 11 times higher when QDs were fully coated by IRMOF-3 than when QDs were attached to the surface of IRMOF-3. The PL intensity from QDs was almost doubled under optimal conditions, which indicates the advantage of using light-harvesting MOFs as a surface modifier for luminescent QDs.

中文翻译：

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通过光收集围绕半导体量子点的金属有机骨架来增强光致发光

作为一种用于光化学和光物理应用的人造天线，基于金属有机框架（MOF）的光收集已经引起了广泛的关注。在本文中，我们报告了通过围绕每个QD作为表面改性剂的光收集框架（IRMOF-3）进行的有效能量转移，半导体量子点（QD）的光致发光增强。IRMOF-3晶体直接生长在量子点的表面，没有任何中间层，例如聚合物。通过稳态激发光谱测量和荧光寿命测量，证实了由于IRMOF-3的光收集而观察到的光致发光增强。在IRMOF-3具有高吸光度的波长区域观察到该现象。基于Förster距离（R ₀）在供体和受体之间，估算了IRMOF-3的体积因子，激发能量从该体积因子转移到了量子点上。我们通过实验证明，当IRDOF-3完全覆盖QD时，能量传递效率比将IQOF附着在IRMOF-3上的能量传递效率高11倍。在最佳条件下，量子点的PL强度几乎增加了一倍，这表明使用聚光MOF作为发光量子点的表面改性剂的优势。