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Hot luminescence from single-molecule chromophores electrically and mechanically self-decoupled by tripodal scaffolds
Nature Communications ( IF 14.7 ) Pub Date : 2023-12-12 , DOI: 10.1038/s41467-023-43948-y
Vibhuti Rai 1 , Nico Balzer 2 , Gabriel Derenbach 1 , Christof Holzer 3 , Marcel Mayor 1, 2, 4, 5 , Wulf Wulfhekel 1, 6 , Lukas Gerhard 1 , Michal Valášek 2
Affiliation  

Control over the electrical contact to an individual molecule is one of the biggest challenges in molecular optoelectronics. The mounting of individual chromophores on extended tripodal scaffolds enables both efficient electrical and mechanical decoupling of individual chromophores from metallic leads. Core-substituted naphthalene diimides fixed perpendicular to a gold substrate by a covalently attached extended tripod display high stability with well-defined and efficient electroluminescence down to the single-molecule level. The molecularly controlled spatial arrangement balances the electric conduction for electroluminescence and the insulation to avoid non-radiative carrier recombination, enabling the spectrally and spatially resolved electroluminescence of individual self-decoupled chromophores in a scanning tunneling microscope. Hot luminescence bands are even visible in single self-decoupled chromophores, documenting the mechanical decoupling between the vibrons of the chromophore and the substrate.



中文翻译:


通过三足支架实现电和机械自解耦的单分子发色团的热发光



控制单个分子的电接触是分子光电子学中最大的挑战之一。将单个发色团安装在扩展的三足支架上可以实现单个发色团与金属引线的有效电气和机械解耦。通过共价连接的延伸三脚架垂直固定在金基板上的核心取代的萘二酰亚胺显示出高稳定性,具有清晰且高效的电致发光直至单分子水平。分子控制的空间排列平衡了电致发光的导电性和绝缘性,以避免非辐射载流子复合,从而能够在扫描隧道显微镜中实现单个自解耦发色团的光谱和空间分辨电致发光。在单个自解耦发色团中甚至可以看到热发光带,记录了发色团的​​振动子与基底之间的机械解耦。

更新日期:2023-12-14
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