ZnSe、ZnS量子点的可控合成与表征

Controlled Synthesis and Characterization of ZnSe and ZnS Quantum Dots

采用改进后的合成方法,以Se和ZnO粉末为原料,在十六胺(HDA)、月桂酸(LA)和三辛基膦(TOP)有机溶剂体系中合成了胶体ZnSe和ZnS量子点。主要研究了溶剂配比、反应温度及生长时间对ZnSe量子点粒径和光学性质的影响。结果表明:制得的ZnSe和ZnS量子点均是纤锌矿型结构,且具有较好的尺寸均匀性、分散性及荧光特性。粒子直径可控制在4.5～8nm范围内。采用参数n(ZnO)∶n(HDA)∶n(LA)=1∶2.1∶5.2,c(TOPSe)=1mol/L,在280℃成核,240℃生长条件下合成的ZnSe量子点具有最佳的尺寸范围,并且随着生长时间的延长,粒径变大,荧光发射峰明显红移。

Adopting improved metal-organic ＂Green method＂, colloidal ZnSe, ZnS quantum dots （QDs） were prepared using cheap and low toxic zinc oxide （ZnO） in an organic solvent system of 1-hexadecylamine （HDA）, lauric acid （LA） and tri-n-octylphosphine （TOP）. The effects of solvents ratio, reaction temperature and growth time on the QD size and photolumineseence properties of ZnSe and ZnS QDs were studied. The results showed that ZnSe and ZnS QDs exhibit the wurtzite structure, good uniformity, dispersity and fluorescent characteristics. The average diameters are in the range of 4.5 - 8 nm. Choosing the optimal parame, ters, n（ZnO） ： n（HDA） ： n（LA） = 1 ： 2.1 ： 5.2, CTOPSe = 1 mol/L, ZnSe QDs with large distributioin range of the size were obtained under the condition of nucleation at 280 ℃ and growth at 240 ℃. With increasing the growth time, the QD size become larger and the emission peak obviously shifts to red.