Light-Harvesting Nanoparticle Core鈥揝hell Clusters with Controllable Optical Output

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• 作者：Dazhi Sun ; Ye Tian ; Yugang Zhang ; Zhihua Xu ; Matthew Y. Sfeir ; Mircea Cotlet ; Oleg Gang
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：9
• 期：6
• 页码：5657-5665
• 全文大小：514K
• ISSN：1936-086X

文摘

We used DNA self-assembly methods to fabricate a series of core鈥搒hell gold nanoparticle鈥揇NA鈥揷olloidal quantum dot (AuNP鈥揇NA鈥換dot) nanoclusters with satellite-like architecture to modulate optical (photoluminescence) response. By varying the intercomponent distance through the DNA linker length designs, we demonstrate precise tuning of the plasmon鈥揺xciton interaction and the optical behavior of the nanoclusters from regimes characterized by photoluminescence quenching to photoluminescence enhancement. The combination of detailed X-ray scattering probing with photoluminescence intensity and lifetime studies revealed the relation between the cluster structure and its optical output. Compared to conventional light-harvesting systems like conjugated polymers and multichromophoric dendrimers, the proposed nanoclusters bring enhanced flexibility in controlling the optical behavior toward a desired application, and they can be regarded as controllable optical switches via the optically pumped color.