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Giant PbSe/CdSe/CdSe Quantum Dots: Crystal-Structure-Defined Ultrastable Near-Infrared Photoluminescence from Single Nanocrystals
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1021/jacs.7b03705
Christina J. Hanson 1 , Nicolai F. Hartmann 1 , Ajay Singh 1 , Xuedan Ma 1 , William J. I. DeBenedetti 2 , Joanna L. Casson 3 , John K. Grey 4 , Yves J. Chabal 5 , Anton V. Malko 2 , Milan Sykora 3 , Andrei Piryatinski 6 , Han Htoon 1 , Jennifer A. Hollingsworth 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1021/jacs.7b03705
Christina J. Hanson 1 , Nicolai F. Hartmann 1 , Ajay Singh 1 , Xuedan Ma 1 , William J. I. DeBenedetti 2 , Joanna L. Casson 3 , John K. Grey 4 , Yves J. Chabal 5 , Anton V. Malko 2 , Milan Sykora 3 , Andrei Piryatinski 6 , Han Htoon 1 , Jennifer A. Hollingsworth 1
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Toward a truly photostable PbSe quantum dot (QD), we apply the thick-shell or “giant” QD structural motif to this notoriously environmentally sensitive nanocrystal system. Namely, using a sequential application of two shell-growth techniques—partial-cation exchange and successive ionic layer adsorption and reaction (SILAR)—we are able to overcoat the PbSe QDs with sufficiently thick CdSe shells to impart new single-QD-level photostability, as evidenced by suppression of both photobleaching and blinking behavior. We further reveal that the crystal structure of the CdSe shell (cubic zinc-blende or hexagonal wurtzite) plays a key role in determining the photoluminescence properties of these giant QDs, with only cubic nanocrystals sufficiently bright and stable to be observed as single emitters. Moreover, we demonstrate that crystal structure and particle shape (cubic, spherical, or tetrapodal) and, thereby, emission properties can be synthetically tuned by either withholding or including the coordinating ligand, trioctylphosphine, in the SILAR component of the shell-growth process.
中文翻译：
巨型PbSe / CdSe / CdSe量子点：晶体结构定义的单纳米晶体超稳定近红外光致发光
为了实现真正的光稳定PbSe量子点（QD），我们将厚壳或“巨型” QD结构图案应用于这个臭名昭著的对环境敏感的纳米晶体系统。也就是说，通过顺序应用两种壳层生长技术（部分阳离子交换以及连续的离子层吸附和反应（SILAR）），我们能够用足够厚的CdSe壳层覆盖PbSe QD，从而赋予新的单QD级光稳定性，可以通过抑制光漂白和眨眼行为来证明。我们进一步揭示，CdSe壳的晶体结构（立方锌闪锌矿或六方纤锌矿）在确定这些巨型量子点的光致发光特性中起着关键作用，只有立方纳米晶体足够明亮和稳定，可以作为单个发射器观察到。而且，
更新日期：2017-08-05
中文翻译：
巨型PbSe / CdSe / CdSe量子点：晶体结构定义的单纳米晶体超稳定近红外光致发光
为了实现真正的光稳定PbSe量子点（QD），我们将厚壳或“巨型” QD结构图案应用于这个臭名昭著的对环境敏感的纳米晶体系统。也就是说，通过顺序应用两种壳层生长技术（部分阳离子交换以及连续的离子层吸附和反应（SILAR）），我们能够用足够厚的CdSe壳层覆盖PbSe QD，从而赋予新的单QD级光稳定性，可以通过抑制光漂白和眨眼行为来证明。我们进一步揭示，CdSe壳的晶体结构（立方锌闪锌矿或六方纤锌矿）在确定这些巨型量子点的光致发光特性中起着关键作用，只有立方纳米晶体足够明亮和稳定，可以作为单个发射器观察到。而且，
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