Barman Monoj Kumar, Paramanik Bipattaran, Bain Dipankar, Patra Amitava
Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata, 700 032, India.
Chemistry. 2016 Aug 8;22(33):11699-705. doi: 10.1002/chem.201601849. Epub 2016 Jul 7.
Several strategies have been adopted to design an artificial light-harvesting system in which light energy is captured by peripheral chromophores and it is subsequently transferred to the core via energy transfer. A composite of carbon dots and dye-encapsulated BSA-protein-capped gold nanoclusters (AuNCs) has been developed for efficient light harvesting and white light generation. Carbon dots (C-dots) act as donor and AuNCs capped with BSA protein act as acceptor. Analysis reveals that energy transfer increases from 63 % to 83 % in presence of coumarin dye (C153), which enhances the cascade energy transfer from carbon dots to AuNCs. Bright white light emission with a quantum yield of 19 % under the 375 nm excitation wavelength is achieved by changing the ratio of components. Interesting findings reveal that the efficient energy transfer in carbon-dot-metal-cluster nanocomposites may open up new possibilities in designing artificial light harvesting systems for future applications.
人们已经采用了几种策略来设计一种人工光捕获系统，在该系统中，光能被外围发色团捕获，随后通过能量转移传递到核心。一种由碳点和染料封装的牛血清白蛋白蛋白包覆金纳米团簇（AuNCs）组成的复合材料已被开发用于高效光捕获和白光产生。碳点（C-点）作为供体，牛血清白蛋白蛋白包覆的金纳米团簇作为受体。分析表明，在香豆素染料（C153）存在的情况下，能量转移从63%增加到83%，这增强了从碳点到金纳米团簇的级联能量转移。通过改变组分比例，在375nm激发波长下实现了量子产率为19%的明亮白光发射。有趣的发现表明，碳点-金属团簇纳米复合材料中的高效能量转移可能为未来应用设计人工光捕获系统开辟新的可能性。
