Efficient photon upconversion enabled by strong coupling between silicon quantum dots and anthracene

Efficient photon upconversion enabled by strong coupling between silicon quantum dots and anthracene
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硅量子点和蒽之间的强耦合实现了高效的光子上转换

DOI:
10.1038/s41557-023-01225-x
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发表时间:
2023
期刊:
影响因子:
21.8
通讯作者:
Tang, Ming Lee
Tang, Ming Lee
中科院分区:
化学1区
文献类型:
--
作者:
Wang, Kefu;Cline, R. Peyton;Schwan, Joseph;Strain, Jacob M.;Roberts, Sean T.;Mangolini, Lorenzo;Eaves, Joel D.;Tang, Ming Lee

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Hybrid structures formed between organic molecules and inorganic quantum dots can accomplish unique photophysical transformations by taking advantage of their disparate properties. The electronic coupling between these materials is typically weak, leading photoexcited charge carriers to spatially localize to a dot or a molecule at its surface. However, we show that by converting a chemical linker that covalently binds anthracene molecules to silicon quantum dots from a carbon-carbon single bond to a double bond, we access a strong-coupling regime where excited carriers spatially delocalize across both anthracene and silicon. By pushing the system to delocalize, we design a photon upconversion system with a higher efficiency (17.2%) and lower threshold intensity (0.5 W/cm^2) than that of a corresponding weakly-coupled system. Our results show that strong coupling between molecules and nanostructures achieved through targeted linking chemistry provides a new route for tailoring properties in materials for light-driven applications.
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