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针对常规F?rster共振能量转移(FRET)体系中能量转移效率低的问题,合成了可见光吸收的Ⅰ型CIS@Zn S核-壳量子点作为能量供体,近红外方酸(SQ)染料作为能量受体,采用超声自组装的方式首次制备了光谱匹配、间距可调的高效FRET能量转移体系.超快/时间分辨光谱证明了CIS和SQ之间的FRET能量转移机制:CIS*+SQ→CIS+SQ*.荧光猝灭动力学数据显示,CIS@Zn S与SQ之间的能量转移对量子点的尺寸存在依赖性,由CIS@Zn S尺寸增加引起的荧光量子产率和供体-受体间距的增加使得体系的FRET能量转移效率(ηFRET)先增大后减小,并且在壳层反应时间为20min时体系的ηFRET值达到最佳值62.8%.该研究对于开发新型、高效、全谱响应的太阳能电池将具有一定的理论及实际应用价值.
In order to solve the problem of low energy transfer efficiency in the conventional FRET system, a type I CIS @ Zn S core-shell quantum dot with visible light absorption was synthesized as an energy donor. Near infrared (S) Energy acceptor, an efficient FRET energy transfer system with spectral matching and adjustable pitch was prepared for the first time by means of ultrasonic self-assembly.The FRET energy transfer mechanism between CIS and SQ was proved by ultrafast / time resolved spectroscopy: CIS * + SQ → CIS + SQ *. Fluorescence quenching kinetics data show that the energy transfer between CIS @ Zn S and SQ is dependent on the size of the quantum dots, the fluorescence quantum yield due to the increased CIS @ Zn S size and the donor- The increase of the interfacial distance made the energy transfer efficiency (ηFRET) of the system first increase and then decrease, and the ηFRET value of the system reached 62.8% at the shell reaction time of 20min.This study is of great significance for the development of new, Full spectrum response of solar cells will have some theoretical and practical value.