Datta Anuja, Biswas Subhajit, Kar Soumitra, Chaudhuri Subhadra
Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata 700032, India.
J Nanosci Nanotechnol. 2007 Oct;7(10):3670-6. doi: 10.1166/jnn.2007.810.
Mn and Cu doped ZnS nanoparticles in powder form were prepared by a simple solvothermal route. Particle size and crystal structure of the products were investigated through X-ray diffraction study revealing the formation of cubic ZnS nanoparticles of average diameter 2.5 nm. Particle size was also verified by the high resolution transmission electron microscopic images. Blue emission at approximately 445 nm was observed from the undoped sample, which was attributed to the presence of large surface defects. With increasing doping concentration the defect related emission gradually quenches and subsequently the impurity related emissions appeared. Mn doped samples exhibited orange emission at approximately 580 nm which may be attributed to the transition between (4)T1 and (6)A1 energy levels of the Mn2+ 3d states. Whereas, the Cu doped ZnS nanoparticles exhibited a red shifted strong blue emission at approximately 466 nm which is attributed to the transition of the electrons from the surface states to the 't2' levels of Cu impurities.
通过简单的溶剂热法制备了粉末状的锰和铜掺杂硫化锌纳米颗粒。通过X射线衍射研究对产物的粒径和晶体结构进行了研究，结果表明形成了平均直径为2.5纳米的立方硫化锌纳米颗粒。高分辨率透射电子显微镜图像也验证了粒径。未掺杂样品在约445纳米处观察到蓝色发射，这归因于大量表面缺陷的存在。随着掺杂浓度的增加，与缺陷相关的发射逐渐猝灭，随后出现与杂质相关的发射。锰掺杂样品在约580纳米处呈现橙色发射，这可能归因于Mn2+ 3d态的(4)T1和(6)A1能级之间的跃迁。而铜掺杂硫化锌纳米颗粒在约466纳米处呈现红移的强蓝色发射，这归因于电子从表面态跃迁到铜杂质的't2'能级。
