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Energy Transfer and Electron Transfer in Composite System of Carbon Quantum Dots/Rhodamine B Molecules
Kang Wei, Lei Zhang, Shen-long Jiang, Qun Zhang*
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
In this work, we investigated the energy transfer (EnT) and electron transfer (ET) processes as well as their relationship in the carbon quantum dots/rhodamine B (CQDs/RhB) including o-CQDs/RhB and m-CQDs/RhB systems by using photoluminescence spectroscopy in combination with steady-state and transient absorption spectroscopy. We found that the ET process is negligible in the o-CQDs/RhB system with an EnT efficiency as high as 73.2%, while it becomes pronounced in the m-CQDs/RhB system whose EnT efficiency is lower than 33.5%. Such an interplay of EnT and ET processes revealed in the prototypical composite system consisting of carbon quantum dots and dye molecules would provide helpful insights for applications of relevance to exciton quenching.
Key words:  Carbon quantum dots, Rhodamine B molecules, Energy transfer, Electron transfer, Photoluminescence spectroscopy, Ultrafast transient absorption spectroscopy
FundProject:
碳量子点/罗丹明B分子复合体系中的能量和电子转移过程研究
韦 康, 张 雷, 江申龙, 张 群*
中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,量子信息与量子科技协同创新中心,合肥 230026
摘要:
本文采用荧光光谱结合稳态和瞬态吸收光谱技术,研究了碳量子点(CQDs)/罗丹明B(RhB)分子复合体系o-CQDs/RhB和m-CQDs/RhB中的能量转移和电子转移过程以及它们之间的关系. 研究发现在能量转移效率为73.2%的o-CQDs/RhB体系中,电子转移过程可以忽略;而在能量转移效率低于33.5%的m-CQDs/RhB体系中,电子转移过程则较为显著. 在这个由碳量子点和染料分子组成的典型复合体系中所揭示的能量转移与电子转移过程之间的内联关系,将为与激子猝灭相关的应用提供有用的视角.
关键词:  碳量子点,罗丹明B分子,能量转移,电子转移,荧光光谱,超快瞬态吸收光谱
DOI:10.1063/1674-0068/cjcp1905105
分类号: