Luminescent properties dependence of water-soluble CdTe quantum dots on stabilizing agents and reaction time  

作　　者：李峥 汪勇先 张国欣 韩彦江 

机构地区：[1]Radiopharmaceutical Centre,Shanghai Institute of Applied Physics,Chinese Academy of Sciences [2]Graduate University,Chinese Academy of Sciences

出　　处：《Journal of Central South University》2010年第6期1148-1154,共7页中南大学学报（英文版）

基　　金：Projects(10805069,10405034) supported by the National Natural Science Foundation of China

摘　　要：The influence of stabilizing agents and reaction time on the luminescent properties of water-soluble CdTe quantum dots(QDs) was discussed.The thioglycolic acid(TGA)-CdTe ODs were characterized by TEM,XRD and FTIR.It is found that larger-size QDs can be synthesized more easily when L-cysteine(Cys) or golutathione(GSH) is chosen as stabilizing agent and TGA is proper to prepare highly luminescent QDs because of the effect between Cd2+ and sulfhydryl group.Furthermore,the absorption wavelength,full width at half maximum(FWHM),stokes shift,photoluminescence(PL) quantum yield and PL stability of TGA-CdTe are strongly dependent on reaction time,in which the absorption wavelength changes against reaction time with an exponential function.The TGA-CdTe QDs prepared at 2 h possess more excellent luminescent properties.The influence of stabilizing agents and reaction time on the luminescent properties of water-soluble CdTe quantum dots （QDs） was discussed. The thioglycolic acid （TGA）-CdTe ODs were characterized by TEM, XRD and FTIR. It is found that larger-size QDs can be synthesized more easily when L-cysteine （Cys） or golutathione （GSH） is chosen as stabilizing agent and TGA is proper to prepare highly luminescent QDs because of the effect between Cd^2＋ and sulfhydryl group. Furthermore, the absorption wavelength, full width at half maximum （FWHM）, stokes shift, photoluminescence （PL） quantum yield and PL stability of TGA-CdTe are strongly dependent on reaction time, in which the absorption wavelength changes against reaction time with an exponential function. The TGA-CdTe QDs prepared at 2 h possess more excellent luminescent properties.

关 键 词：CdTe quantum dots stabilizing agent reaction time luminescent property 

分 类 号：O471.1[理学—半导体物理]