CdTe量子点在液体石蜡体系的制备

选用液体石蜡作为高温反应溶剂, 油酸和TOP(三正辛基膦)分别作为镉源和碲源的溶剂兼配体, 利用高温热解法一步合成了高质量的CdTe量子点. 借助紫外-可见吸收光谱、荧光发射光谱、透射电子显微镜及X射线粉末衍射等分析手段对产物的性能进行表征. 结果表明, 反应的温度、反应时间、溶液的浓度、配体的数量均对量子点的生长过程和光学性质有明显影响. 利用这种方法制得的CdTe量子点均为立方闪锌矿结构, 粒径范围为3~7 nm, 最大发射波长在570~720 nm范围内连续可调, 荧光量子产率最高达到65%, 并且具有良好的热稳定性.

High-quality CdTe Quantum Dots Synthesized in Liquid Paraffin Wax

A novel route was developed to synthesize high quality oil soluble CdTe quantum dots. Liquid pa-raffin wax system was used to replace tri-n-octylphosphine oxide(TOPO) as the solvent for the synthesis of highly luminescent CdTe QDs at relatively low temperatures(200—260 ℃). Compared with TOPO, liquid paraffin is cheaper, more friendly to environmentally, and more stable in the air. The effects of the reaction temperature, growth time, precursor concentration, and the quantities of the ligands on the properties of the CdTe QDs were investigated in this paper. This new route reduces the raw material cost and enables us to obtain CdTe QDs with a broad emission spectral ranging from 570 to 720 nm at relatively low temperatures. The as-prepared CdTe QDs also possess a high PLQY(up to 65%) and good thermal stability.