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Gold nanoclusters with bright near-infrared photoluminescence

机译：黄金近红外发光明亮光致发光

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摘要

The increase in nonradiative pathways with decreasing emission energy reduces the luminescence quantum yield (QY) of near-infrared photoluminescent (NIR PL) metal nanoclusters. Efficient surface ligand chemistry can significantly improve the luminescence QY of NIR PL metal nanoclusters. In contrast to the widely reported but modestly effective thiolate ligand-to-metal core charge transfer, we show that metal-to-ligand charge transfer (MLCT) can be used to greatly enhance the luminescence QY of NIR PL gold nanoclusters (AuNCs). We synthesized water-soluble and colloidally stable NIR PL AuNCs with unprecedentedly high QY (similar to 25) upon introduction of triphenylphosphonium moieties into the surface capping layer. By using a combination of spectroscopic and theoretical methods, we provide evidence for gold core-to-ligand charge transfer occurring in AuNCs. We envision that this work can stimulate the development of these unusually bright AuNCs for promising optoelectronic, bioimaging, and other applications.
机译：增加非辐射的途径减少排放能源减少了近红外发光量子产率(QY)发光(NIR PL)金属发光机制。高效的表面配位化学显著提高近红外光谱的发光QYPL金属发光机制。但适度有效的硫醇盐ligand-to-metal核心电荷转移,我们表演metal-to-ligand电荷转移(MLCT)用于的发光QY大大增强近红外光谱PL黄金纳米束(AuNCs)。水溶性和胶体稳定的近红外光谱PL AuNCsQY空前高的(类似于25%)在介绍triphenylphosphonium半个表面覆盖层。光谱和理论的结合方法,我们为黄金提供证据core-to-ligand电荷转移发生AuNCs。这些异常明亮的AuNCs的发展有前途的光电子,bioimaging,其他应用程序。

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