无膦溶剂制备带隙可调谐ZnS1—xSex量子点

本文利用将硒（Se）粉直接置于十八烯（ODE）溶剂搅拌形成悬浮液获得Se前驱体（ODE—Se）代替传统的三丁基膦一硒（TBP—Se），制备无镉（Cd）的硒硫锌（ZnSl-xSex）合金量子点。紫外可见吸收光谱及发光光谱测试表明，当ODE—S：ODE—Se由7：3逐渐减少到0：10时，其吸收边由350nm红移到420nm，激子发光峰位从378nm红移到429nm．表明通过调节前驱体比例成功实现了对ZnSI—xSex量子点能带的调控。另外，为了理解ODE—Se与传统TBP—Se的差异。分别用这两种前驱体制备了纯ZnSe量子点。研究结果表明，相比于三丁基膦一硒（TBP—Se），利用ODE—Se为Se前驱体制备的ZnSe量子点尺寸更大并分布更宽，证明ODE—Se的活性强于TBP—Se。

Phosphine-free Synthesis of Alloyed ZnSl-xSex Quantum Dots with Tunable Bandgap Emissions

In this paper, the ODE-Se, instead of the traditional TBP-Se as Se precursor, was firstly used to prepare cadmium-free ZnS1-xSex alloyed quantum dots （QDs）. UV-Vis optical absorption and photoluminescence spectra were used to characterize the QDs. It was found that the absorption edge exhibit a red shift from 350 to 420 nm, while the exciton emission peak shifted from 378 to 429 nm, when the ratio of ODE -S ： ODE -Se decreases from 7：3 to 0.10. The experimental results suggested that the energy gap of the ZnS1-xSex QDs could be successfully adjusted by tailoring the precursor ratios of ODE-S to ODE-Se. To clarify the difference between ODE-Se and ODE-Se on the growth of the QDs, pure ZnSe QDs were synthesized by using these two kind Se precursors as mentioned above. The experimental results indicated that, as compared to TBP-Se, ZnSe QDs could have larger sizes and wider size distribution with ODE-Se as the Se precursor, which could be attributed to the higher activity of ODE-Se than that of TBP-Se.