摘要
通过水相合成法快速且低成本地合成了荧光量子产率高、粒径均匀、光稳定良好的吡啶二羧酸(DPA)螯合型CdSe:Tb^(3+)量子点。并且通过紫外分光光度计、荧光分光光度计和扫描电子显微镜(SEM)对产物进行了表征。本课题研究了[Tb^(3+)]/[DPA]比例、反应温度、反应转速对DPA与Tb^(3+)的螯合后光学性质的影响。结果表明:当[Tb^(3+)]/[DPA]=10∶1、t=60℃、反应转速为400 r/min时,得到了DPA激发Tb^(3+)的最佳条件,将此条件运用到制备DPA螯合型CdSe:Tb^(3+)量子点中,制成的DPA-CdSe:Tb^(3+)量子点的最大吸收峰在400 nm处,它的荧光发射峰在560 nm处,相比较于未经修饰的CdSe量子点,荧光发射峰向右偏移了10 nm,荧光强度得到了增强且量子点比较稳定,合成的吡啶二羧酸(DPA)螯合型CdSe:Tb^(3+)量子点荧光强度较强、稳定性好、量子产率高。
The CdSe： Tb^3＋ quantum dots synthesized by DPA chelate with high fluorescence quantum yield, uniform particles distribution and good photo stability were rapidly and low-costly prepared by aqueous phase synthesis. The CdSe： Tb^3＋ quantum dots synthesized by DPA chelating were characterized by ultraviolet spectrophotometer, fluorescence spectrophotometer and scanning electron microscope （SEM）. The best synthetic conditions, including the ratio of [ Tb^3＋ ]/[ DPA ], temperature and speed were optimized in the process of preparation of the DPA and Tb^3＋ chelating. The results show that the optimum conditions of the DPA inspire Tb^3＋ are [ Tb^3＋ ]/[ DPA ] = 10： 1, t = 60 ℃, the reaction speed 400 r/min, utilizing these conditions in the preparation of the DPA chelating CdSe： Tb^3＋ quantum dot, made of the DPA-CdSe： Tb^3＋ quantum dots＇ maximum excitation peak at 400 nm, its fluorescence emission peak at 560 nm, compared with unmodified version of the CdSe quantum dots, the position of the fluorescence emission peak has a displacement to the right for 10 nm. As a consequence, the fluorescence intensity, fluorescence stability and quantum yield of CdSe： Tb^3＋ quantum dots synthesized by DPA chelating were improved.
作者
邵屾
应明
SHAO Shen YING Ming(School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, Chin)
出处
《化学工程》
CAS
CSCD
北大核心
2017年第3期59-63,共5页
Chemical Engineering(China)
