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Aggregation-induced phosphorescence enhancement of Mn-doped ZnS quantum dots: the role of dot-to-dot distance†
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-23 00:00:00 , DOI: 10.1039/c8nr02151a Jinyi Zhang 1, 2, 3, 4 , Dandan Tang 1, 2, 3, 4 , Yadong Yao 2, 3, 4, 5 , Xiandeng Hou 1, 2, 3, 4, 6 , Peng Wu 2, 3, 4, 6
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-23 00:00:00 , DOI: 10.1039/c8nr02151a Jinyi Zhang 1, 2, 3, 4 , Dandan Tang 1, 2, 3, 4 , Yadong Yao 2, 3, 4, 5 , Xiandeng Hou 1, 2, 3, 4, 6 , Peng Wu 2, 3, 4, 6
Affiliation
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Assembled nanoparticles promote many applications in optics due to their instinct properties. The aggregation-induced phosphorescence enhancement (AIPE) of Mn-doped ZnS quantum dots (QDs) is widely used in biosensing, but the mechanism of such an enhancement is still unproven. This study explores the mechanism of the interesting finding of AIPE of Mn-doped ZnS QDs. To induce the aggregation of QDs, the method of electrostatic assembly was explored herein: negatively charged QDs were aggregated with protamine and positively charged QDs were aggregated with heparin. Using several ligands with hierarchical molecular weights for capping Mn-doped ZnS QDs, it was found that the AIPE of Mn-doped ZnS QDs was exponentially dependent on the dot-to-dot distance in aggregates. Together with detailed analysis of both the steady- and transient-state luminescence behaviors of Mn-doped ZnS QDs before and after aggregation, charge transfer from one dot (surface traps) to another (dopant bands) was identified as the driving factor for AIPE. Moreover, the d-band of the Mn2+ dopants was essential for the AIPE since it acts as the acceptor for the transferred charge from neighboring QDs. These conclusions can significantly contribute for better understanding of this interesting luminescence mechanism and future designing of the most suitable sensing systems.
中文翻译：
聚集诱导的Mn掺杂ZnS量子点的磷光增强：点到点距离的作用†
组装后的纳米颗粒由于其本能特性而在光学方面有许多应用。Mn掺杂的ZnS量子点（QDs）的聚集诱导的磷光增强（AIPE）被广泛用于生物传感，但是这种增强的机制仍未得到证实。这项研究探讨了有趣的发现锰掺杂的ZnS QDs AIPE的机制。为了诱导量子点的聚集，本文探索了静电组装的方法：带负电荷的量子点与鱼精蛋白聚集在一起，带正电荷的量子点与肝素聚集在一起。使用几种具有分级分子量的配体来封盖Mn掺杂的ZnS QDs，发现Mn掺杂的ZnS QDs的AIPE指数依赖于聚集体中点到点的距离。结合对掺杂前后Mn掺杂的ZnS QD的稳态和瞬态发光行为的详细分析，电荷从一个点（表面陷阱）到另一个点（掺杂带）的转移被确定为AIPE的驱动因素。此外，Mn的d带2+掺杂剂对于AIPE是必不可少的，因为它充当了从邻近量子点转移的电荷的接受体。这些结论可以为更好地理解这种有趣的发光机理和最合适的传感系统的未来设计做出重要贡献。
更新日期：2018-04-23
中文翻译：
聚集诱导的Mn掺杂ZnS量子点的磷光增强：点到点距离的作用†
组装后的纳米颗粒由于其本能特性而在光学方面有许多应用。Mn掺杂的ZnS量子点（QDs）的聚集诱导的磷光增强（AIPE）被广泛用于生物传感，但是这种增强的机制仍未得到证实。这项研究探讨了有趣的发现锰掺杂的ZnS QDs AIPE的机制。为了诱导量子点的聚集，本文探索了静电组装的方法：带负电荷的量子点与鱼精蛋白聚集在一起，带正电荷的量子点与肝素聚集在一起。使用几种具有分级分子量的配体来封盖Mn掺杂的ZnS QDs，发现Mn掺杂的ZnS QDs的AIPE指数依赖于聚集体中点到点的距离。结合对掺杂前后Mn掺杂的ZnS QD的稳态和瞬态发光行为的详细分析，电荷从一个点（表面陷阱）到另一个点（掺杂带）的转移被确定为AIPE的驱动因素。此外，Mn的d带2+掺杂剂对于AIPE是必不可少的，因为它充当了从邻近量子点转移的电荷的接受体。这些结论可以为更好地理解这种有趣的发光机理和最合适的传感系统的未来设计做出重要贡献。
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