Microwave-assisted aqueous synthesis of transition metal ions doped ZnSe/ZnS core/shell quantum dots with tunable white-light emission
Microwave-assisted aqueous synthesis of transition metal ions doped ZnSe/ZnS core/shell quantum dots with tunable white-light emission
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微波辅助水相合成具有可调白光发射的过渡金属离子掺杂 ZnSe/ZnS 核/壳量子点
DOI：
10.1016/j.apsusc.2015.05.178
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发表时间：
2015-10-01
影响因子：
6.7
通讯作者：
Guo, Ruiqian
中科院分区：
文献类型：
--
作者：
Zhang, Jie;Chen, Qiuhang;Guo, Ruiqian
报道了明亮的白光发射锰和铜共掺杂的硒化锌/硫化锌核/壳量子点（QDs）（Cu,Mn:ZnSe/ZnS）的合成。采用微波辅助的水溶液通用热注入法制备了水溶性的锰和铜掺杂的硒化锌基量子点。研究了硒/硫比、稳定剂、回流时间以及铜/锰掺杂离子浓度对粒径和光致发光（PL）的影响。利用X射线粉末衍射仪（XRD）、高分辨率透射电子显微镜（HRTEM）、紫外 - 可见（UV - vis）分光光度计和荧光分光光度计对不同生长阶段制备的量子点进行了表征。研究发现，在温和条件下合成的这些硒化锌基量子点在390 - 585 nm范围内发光。经过紫外照射处理后，所制备的水溶性硒化锌量子点的光致发光量子产率（QY）可高达24.3%。通过锰和铜掺杂有效地抑制了硒化锌的带隙发射。回流时间不仅影响锰的掺杂，还影响铜的掺杂，这导致了Mn:ZnSe的最佳回流时间以及Cu:ZnSe量子点发射的红移。从Cu,Mn:ZnSe/ZnS核/壳量子点中获得了共掺杂诱导的白光发射（WLE），这为下一代白光发光二极管（LEDs）提供了机会。（C）2015爱思唯尔公司。版权所有。
Synthesis of bright white-light emitting Mn and Cu co-doped ZnSe/ZnS core/shell quantum dots (QDs) (Cu,Mn:ZnSe/ZnS) was reported. Water-soluble ZnSe-based QDs with Mn and Cu doping were prepared using a versatile hot-injection method in aqueous solution with a microwave-assisted approach. Influence of the Se/S ratio, stabilizer, refluxing time and the concentration of Cu/Mn dopant ions on the particle size and photoluminescence (PL) were investigated. The as-prepared QDs in the different stages of growth were characterized by X-ray powder diffractometer (XRD), high-resolution transmission electron microscopy (HRTEM), UV-visible (UV-vis) spectrophotometer, and fluorescence spectrophotometer. It is found that these ZnSe-based QDs synthesized under mild conditions exhibit emission in the range of 390-585 nm. The PL quantum yield (QY) of the as-prepared water-soluble ZnSe QDs can be up to 24.3% after the UV-irradiation treatment. The band-gap emission of ZnSe is effectively restrained through Mn and Cu doping. The refluxing time influences the doping of not only Mn, but also Cu, which leads to the best refluxing time of Mn:ZnSe and the red-shift of the emission of Cu:ZnSe d-dots. Co-doping induced white-light emission (WLE) from Cu,Mn:ZnSe/ZnS core/shell QDs were obtained, which can offer the opportunity for future-generation white-light emitting diodes (LEDs). (C) 2015 Elsevier B.V. All rights reserved.