Tunable emission of cadmium-free transition metal(Cu, Mn, Ag) co-doped ZnInS/ZnS core-shell quantum dots

无镉过渡金属(Cu、Mn、Ag)共掺杂ZnInS/ZnS核壳结构量子点的可调谐发光（英文）

Color tunable quantum dots（QDs） based on the Cu, Mn, Ag co-doped Zn In S core and Zn S outer-shell were synthesized by using an eco-friendly method. Core-shell doped QDs with the average size of 3.85 nm were obtained by using a one-pot synthesis followed by a hot injection with n-dodecanethiol（DDT） and oleylamine（OLA） as stabilizers in oil phase. Cu, Mn and Ag ions were introduced as single-dopant or co-dopants during the synthesis, providing an effective means to control the emission color of the QDs. The as-synthesized QDs showed photoluminescence emission ranging from green（530 nm） to near-red（613 nm）, adjusted by doping components, dopant concentration, and Zn/In ratio. Importantly, quasi-white emission has been achieved by controlling the concentration of co-doped metal ions（Mn, Cu and Ag）. The primary results demonstrated the promising potential of co-doped QDs as alternative materials for future high quality white LED applications.

通过简易环保的方法合成一种以过渡金属(Cu、Mn和Ag)掺杂Zn In S为内核、Zn S为壳层的发光可调谐的核壳结构量子点(平均粒径3.85 nm)。在油相体系中,以十二硫醇(DDT)和油胺(OLA)为稳定剂,通过一锅法先在体系中形成内核量子点,随后通过热注射法包覆Zn S壳层。在量子点的合成中,引入过渡金属(Cu、Mn和Ag)进行单独掺杂或共掺杂,实现量子点的可调谐发光。通过调节掺杂元素的种类、掺杂浓度以及前驱体Zn/In的比例,所合成的量子点发光可以在绿光(530 nm)到近红光(613 nm)范围内进行调节。通过3种过渡金属(Cu、Mn和Ag)的共掺杂,成功获得具有准白光发射的量子点。结果表明,这种共掺杂量子点在未来高性能白光LED应用领域有很好的发展前景。