Thick-shell not only provides colloidal quantum dots (QDs) stability and workability, but also plays a significant role in passivation of QDs surface defects and change of electron transport characteristics of QDs. Here, the dedicated design and synthesis of high luminescence CdZnSe/CdSe/CdZnSe quantum wells are reported by precisely controlled shell growth. By tuning the thicknesses of the CdSe and CdZnSe layers, photoluminescence quantum yields (PLQY) can be attained a maximum of 97% as the CdSe shell thickness is 4 monolayers and the CdZnSe shell thickness is 10 monolayers. These gradient thick shell CdZnSe/CdSe/CdZnSe quantum wells confirm the suppression of surface trap-state emission in gradient core/shell structures. Superior optical properties render CdZnSe/CdSe/CdZnSe quantum wells suitable for use in solid-state lightings.

中文翻译：

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研究具有 97% PLQY 的新型 CdZnSe/CdSe/CdZnSe 量子阱

厚壳不仅提供了胶体量子点（QDs）的稳定性和可加工性，而且在QDs表面缺陷的钝化和QDs电子传输特性的改变中起着重要作用。在这里，通过精确控制的壳生长报告了高发光 CdZnSe/CdSe/CdZnSe 量子阱的专用设计和合成。通过调整 CdSe 和 CdZnSe 层的厚度，由于 CdSe 壳层厚度为 4 个单层，CdZnSe 壳层厚度为 10 个单层，因此光致发光量子产率 (PLQY) 最高可达到 97%。这些梯度厚壳 CdZnSe/CdSe/CdZnSe 量子阱证实了梯度核/壳结构中表面陷阱态发射的抑制。卓越的光学特性使 CdZnSe/CdSe/CdZnSe 量子阱适用于固态照明。