摘要
以CdCl2和TeO2为原料,硼氢化钠为还原剂,采用水相合成法制备巯基丁二酸稳定CdTe量子点。研究了反应时间、碲和镉的物质的量之比等实验条件对CdTe量子点发光性能的影响,并用X射线粉末衍射、透射电镜、红外光谱、紫外-可见吸收光谱和荧光光谱等分析技术对其进行表征。实验表明,合成的量子点为立方晶型,颗粒大小分布均匀。反应时间及碲和镉的物质的量之比对量子点的发光性能有明显影响,随着反应时间的延长,量子点的吸收与荧光光谱都向长波方向移动,在pH值为10.5的碱性条件下,当n(Cd)∶n(Te)∶n(MSA)=1∶0.05∶1.4时,在5h的时间内可获得发绿色到红色荧光的量子点,最高荧光量子产率为70.3%。
Mercaptosuccinic acid（MSA）-capped CdTe quantum dots（QDs） were prepared in an aqueous medium with CdCl2 and TeO2 as raw materials,and NaBH4 as reductant.The influence of refluxing time and tellurium to cadmium molar ratio on the luminescent properties of the obtained CdTe QDs were investigated,and the obtained QDs were characterized by X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FT-IR）,ultraviolet-visible spectroscopy and fluorescent spectroscopy,respectively.The results showed that the CdTe QDs were of zinc-blended crystal structure in a sphere-like shape.The absorption and fluorescence spectra of QDs shifted to longer wavelengths with the increasing of refluxing time.The CdTe QDs with the emission color ranging from green to red could be prepared at pH=10.5,n（Cd）∶n（Te）∶n（MSA）=1∶0.05∶1.4 within 5h,the maximum quantum yield was 70.3%.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第23期3249-3251,3256,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(61066006)
广西大学科研基金资助项目(XBZ110359)
关键词
半导体纳米晶
化学合成
光学性质
发光
semicondutor nanocrystal
chemical synthesis
optical properties
luminescence
