Double-Well Colloidal Nanocrystals Featuring Two-Color Photoluminescence
Double-Well Colloidal Nanocrystals Featuring Two-Color Photoluminescence
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DOI：
10.1021/acs.chemmater.7b02585
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发表时间：
2017-09
影响因子：
8.6
通讯作者：
Natalia Razgoniaeva;Mingrui Yang;Cooper Colegrove;Natalia Kholmicheva;P. Moroz;H. Eckard;Abigail Vore;M. Zamkov
中科院分区：
文献类型：
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作者：
Natalia Razgoniaeva;Mingrui Yang;Cooper Colegrove;Natalia Kholmicheva;P. Moroz;H. Eckard;Abigail Vore;M. Zamkov
比率传感策略依赖于来自同一纳米物体的两个光致发光（PL）信号的比率来检测周围介质的变化。最近，这种双色发射已在半导体胶体中得到证实，其中来自量子限制域的 PL 信号与来自过渡金属离子或块状结构的二次发射相补充。在这里，我们报告了双色纳米晶体胶体的开发，该胶体在同一纳米物体内结合了两个量子限制发射器。报道的形态依赖于双阱核/势垒/壳排列，其中核组分（PbS）的零维激子可以与壳域（CdSe）的二维激子共存。因此，核和壳发射带可以分别在 880-1500 nm 和 600-650 nm 光谱窗口内独立调谐。 PbS/CdSe 界面处的 CdS 势垒旨在抑制能量和电荷扩散...
Ratiometric sensing strategy relies on the ratio of the two photoluminescence (PL) signals originating from the same nano-object for detecting the changes in the surrounding media. Recently, such dual-color emission has been demonstrated in semiconductor colloids, where the PL signal from a quantum-confined domain was complemented with the secondary emission from transition metal ions or a bulk-like structure. Here, we report on the development of dual-color nanocrystal colloids featuring a combination of two quantum-confined emitters within the same nano-object. The reported morphology relies on double-well core/barrier/shell arrangement, where zero-dimensional excitons of the core component (PbS) can coexist with two-dimensional excitons of the shell domain (CdSe). As a result, the core and shell emission bands can be independently tuned across 880–1500 nm and 600–650 nm spectral windows, respectively. A CdS potential barrier at the PbS/CdSe interface was designed to suppress the energy and charge diffu...