摘要
Bright Cu-doped ternary ZnCdS quantum dots (ZnCdS:Cu QDs) with varied Cd concentrations were synthesized in aqueous solution by using a convenient microwave method.These ternary QDs could be directly dispersed in water solution.By regulating the Cd2+ concentration from 0 to 50% (mole fraction of the cations),the photoluminescence excitation (PLE) peak of such ZnCdS:Cu QDs could be continuously redshifted from 320 nm to 380 nm,while their photoluminescence (PL) peak was redshifted from 490 nm to 580 nm,exhibiting multicolor Cu-related emissions.Furthermore,the quantum yield of the ZnCdS:Cu QDs could reach as high as 12% by regulating the Cu doping concentration.These ZnCdS:Cu ternary QDs with kind surface conditions and good composition-controllable optical properties may have potential application in many areas such as sensing,bioimaging,and light-emitting diodes.
Bright Cu-doped ternary ZnCdS quantum dots (ZnCdS:Cu QDs) with varied Cd concentrations were synthesized in aqueous solution by using a convenient microwave method.These ternary QDs could be directly dispersed in water solution.By regulating the Cd2+ concentration from 0 to 50% (mole fraction of the cations),the photoluminescence excitation (PLE) peak of such ZnCdS:Cu QDs could be continuously redshifted from 320 nm to 380 nm,while their photoluminescence (PL) peak was redshifted from 490 nm to 580 nm,exhibiting multicolor Cu-related emissions.Furthermore,the quantum yield of the ZnCdS:Cu QDs could reach as high as 12% by regulating the Cu doping concentration.These ZnCdS:Cu ternary QDs with kind surface conditions and good composition-controllable optical properties may have potential application in many areas such as sensing,bioimaging,and light-emitting diodes.
基金
Supported by the National Natural Science Foundation of China (10904119)