Heterostructuring Nanocrystal Quantum Dots Toward Intentional Suppression of Blinking and Auger Recombination.
Heterostructuring Nanocrystal Quantum Dots Toward Intentional Suppression of Blinking and Auger Recombination.
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DOI：
10.1021/cm304161d
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发表时间：
2013-04-23
影响因子：
8.6
通讯作者：
Hollingsworth, Jennifer A.
中科院分区：
文献类型：
--
作者：
Hollingsworth, Jennifer A.
在单个粒子的水平上，纳米晶体量子点（NQDs）被观察到间歇性地发出荧光或“眨眼”。它们还具有有效的非辐射复合过程，称为俄歇复合（AR）。最近，NQD异质结构的新方法已经开发出来，直接影响眨眼和AR，从而显著抑制这些不需要的过程。本文综述了三种成功的异质nqd基序：(1)界面合金化，(2)厚壳或“巨型”壳，以及(3)特定的ii型电子结构。这些依赖于修改或调整内部NQD核/壳结构的方法，与依赖于表面修饰或表面介导的相互作用的闪烁抑制替代策略进行了比较。最后，在每种情况下，讨论了推动实现新颖和重要功能的独特合成方法或挑战，以及对开发闪烁和ar抑制异质结构nqd的综合“材料设计”策略的影响。
At the level of a single particle, nanocrystal quantum dots (NQDs) are observed to fluoresce intermittently or “blink.” They are also characterized by an efficient non-radiative recombination process known as Auger Recombination (AR). Recently, new approaches to NQD heterostructuring have been developed that directly impact both blinking and AR, resulting in dramatic suppression of these unwanted processes. The three successful hetero-NQD motifs are reviewed here: (1) interfacial alloying, (2) thick or “giant” shells, and (3) specific type-II electronic structures. These approaches, which rely on modifying or tuning internal NQD core/shell structures, are compared with alternative strategies for blinking suppression that rely, instead, on surface modifications or surface-mediated interactions. Finally, in each case, the unique synthetic approaches or challenges addressed that have driven the realization of novel and important functionality are discussed, along with the implications for development of a comprehensive ‘materials design’ strategy for blinking and AR-suppressed heterostructured NQDs.
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