Fabrication of Core-Shell-Type Copper Indium Selenide and Zinc Selenide Composite Quantum Dots and Their Optical Properties
Fabrication of Core-Shell-Type Copper Indium Selenide and Zinc Selenide Composite Quantum Dots and Their Optical Properties
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DOI：
10.1166/jnn.2011.4181
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发表时间：
2011-06-01
影响因子：
--
通讯作者：
Otsuka-Yao-Matsuo, Shinya
中科院分区：
文献类型：
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作者：
Omata, Takahisa;Nose, Katsuhiro;Otsuka-Yao-Matsuo, Shinya
我们成功地制备了基于三元CuInSe 2的核/壳型复合量子点。对于CuInSe 2/ZnSe核/壳量子点，观察到增强的光致发光（PL）发射强度，例如光致发光量子产率（PLOY）的16%，以及ZnSe涂层后发射的蓝移。PLQY的增加是由于从有机十六烷基胺到无机ZnSe的表面封端配体的交换和由于合金化的限制分布的平滑化的结果。蓝移归因于由于核-CuInSe 2与其界面周围的ZnSe-壳的部分合金化，核-CuInSe 2区域的有效尺寸收缩。对于倒置的核/壳QD，即，名义上的ZnSe/CuIn 5Se 8核/壳QD，它们在619 nm处显示红色发射。在Cu-In-Se体系中，该量子点的发射波长最短。
We successfully fabricated core/shell-type composite QDs based on the ternary-CuInSe2. For the CuInSe2/ZnSe core/shell QDs, an enhanced photoluminescence (PL) emission intensity, such as 16% of the photoluminescence quantum yield (PLOY), and a blue-shift in the emission after the ZnSe coating, were observed. The increase in the PLQY was the result of an exchange of the surface capping ligand from the organic hexadecylamine to the inorganic ZnSe and the smoothing of the confining profile due to the alloying. The blue-shift was attributed to the shrinkage of the effective size of the core-CuInSe2 region due to the partial alloying of the core-CuInSe2 with the ZnSe-shell around their interfaces. For the inverted core/shell QDs, i.e., the nominally ZnSe/CuIn5Se8 core/shell QDs, they showed a red emission at 619 nm. The emission wavelength is the shortest among the previously reported QDs in Cu-In-Se system.