Abstract
The comparison of growth processes and fluorescent properties of CdTe semiconductor quantum dots (QDs) that are synthesized in water with different modifiers are discussed in this paper. The samples are characterized through ultraviolet,visible spectra (UV,Vis),photoluminescence spectra (PL) and zeta potential. The results show that when the reaction time is prolonged for the same modifier, the ultraviolet absorption peak and fluorescent emission peak present obvious red shifts and the diameters of the QDs continuously increase. With the same reaction time but different modifiers, QDs with different diameters can be gained. The average full width at half maximum of the photoluminescence spectra is about 50 nm which shows that the monodispersity is quite good.Under the best reaction conditions, the highest quantum yield (QY) can be attained by using thioglycollic acid (TGA) as modifier when the reaction time is 240 min.The zeta potential is influenced by the modifier and pH.
基金项目
国家重点基础研究发展计划(973计划)(2005CB723400-G)
国家高技术研究发展计划(863计划)(2007-AA022003)
国家自然科学基金(20771075)
Pujiang Plan Proiect(06PJ14049)
Science and Technology()
NETL
NSTL
万方数据