In recent years, light-emitting Mn2+-doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn2+ d–d emission. Herein, highly efficient colloidal Mn2+-doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn2+ emission can be adjusted by changing the doping level of Mn2+. In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn2+ ions changed by the doping concentration. The PL intensity of Mn2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn2+-doped Cd–In–S NCs as a color conversion material. The Mn2+-doped multicomponent semiconductor NCs reported here extend the availability of classical Mn2+-doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.

中文翻译：

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Mn2+掺杂的Cd-In-S胶体纳米晶的合成及光学性质

近年来，发光的 Mn2+ 掺杂纳米晶体 (NCs) 由于其强而稳定的 Mn2+ d-d 发射而得到广泛研究。在此，通过热注入策略制备了高效的胶体 Mn2+ 掺杂的 Cd-In-S NCs。所制备的 NCs 具有 CdS 主体的立方晶体结构，并表现出强烈的 Mn2+ 发射。可以通过改变 Mn2+ 的掺杂水平来调整这种 Mn2+ 发射的光致发光 (PL) 强度、PL 位置和 PL 寿命。特别是，通过调整掺杂量，发射颜色可以在 601 nm 到 643 nm 的范围内变化，这是由于掺杂浓度改变了 Mn2+ 离子的配位场环境。ZnS壳涂层显着增强了Mn2+的PL强度，最高PL量子产率可达56%，这归因于通过壳改性去除了与 NC 表面相关的缺陷。还通过使用所制备的高效 Mn2+ 掺杂的 Cd-In-S NC 作为颜色转换材料制造了原型 LED。此处报道的 Mn2+ 掺杂多组分半导体 NCs 扩展了经典 Mn2+ 掺杂发光材料的可用性，并为需要橙红色胶体 NCs 的其他应用提供了替代品。