Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education Institutes, Lingnan Normal University, Zhanjiang 524048, P. R. China.
Chem Commun (Camb). 2020 Jun 7;56(45):6130-6133. doi: 10.1039/d0cc01302a. Epub 2020 May 4.
Quantum dots with narrow emission line width have persistently received attention for their applications in biological imaging, lasers and next-generation displays. We herein report a cation exchange assisted shelling approach changing the starting CdSe emitting cores into new ZnCdSe alloy emitting cores and finally ZnCdSe/ZnSe core/shell QDs. The resulting ZnCdSe/ZnSe QDs exhibit an emission line width as narrow as 17.1 nm with a near-unity photoluminescence quantum yield and a single emission channel. We anticipate that our study on a cation exchange assisted synthetic route for controlling the emission line widths of the QDs could be extended to high-quality green and blue ones beyond currently achieved.
窄发射线宽的量子点因其在生物成像、激光和下一代显示器中的应用而受到持续关注。在此，我们报告了一种阳离子交换辅助的壳层方法，将起始 CdSe 发射核转变为新的 ZnCdSe 合金发射核，最终得到 ZnCdSe/ZnSe 核/壳 QD。所得 ZnCdSe/ZnSe QD 的发射线宽窄至 17.1nm，光致发光量子产率接近 1，发射通道单一。我们预计，我们对阳离子交换辅助合成路线控制 QD 发射线宽的研究可以扩展到目前已经实现的高质量的绿色和蓝色 QD。
