Mn-Doped quantum dots(QDs)are of high interest for numerous applications like solar cells,optoelectronics,optosensing,or bioimaging.Here,we report the preparation of quaternary(AgInS_(2))_(x)(MnS)_(y)(ZnS)_(1-x-y) QDs...Mn-Doped quantum dots(QDs)are of high interest for numerous applications like solar cells,optoelectronics,optosensing,or bioimaging.Here,we report the preparation of quaternary(AgInS_(2))_(x)(MnS)_(y)(ZnS)_(1-x-y) QDs,thereafter noted Mn:AIZS via a thermally induced decomposition of Ag,In,Zn and Mn precursors in the presence of oleylamine and dodecanethiol.The Mn:AIZS QDs have an average diameter of 3.5 nm and their XRD patterns can be indexed with the orthorhombic phase of AgInS2.The incorporation of Mn^(2+)ions in the AIZS crystal lattice results in a red-shift of the photoluminescence(PL)emission maximum depending on the Mn^(2+)content.The PL quantum yields decrease upon loading with Mn^(2+)but remained high(53-31%)until 50%theoretical loading in Mn^(2+).Steady state,PL excitation and time-resolved PL measurements suggest that Mn^(2+)-dependent trap states are involved in the PL emission.Mn:AIZS QDs exhibit also magnetic properties.In addition,Mn:AIZS QDs can easily be transferred to the aqueous phase using the PMAO amphiphilic polymer without alteration of their optical properties(PL quantum yield up to 51%),revealing their high potential for biological applications.展开更多
基金the Bolashak International Scholarship of JSC“Center for International Programs”for financial support.
文摘Mn-Doped quantum dots(QDs)are of high interest for numerous applications like solar cells,optoelectronics,optosensing,or bioimaging.Here,we report the preparation of quaternary(AgInS_(2))_(x)(MnS)_(y)(ZnS)_(1-x-y) QDs,thereafter noted Mn:AIZS via a thermally induced decomposition of Ag,In,Zn and Mn precursors in the presence of oleylamine and dodecanethiol.The Mn:AIZS QDs have an average diameter of 3.5 nm and their XRD patterns can be indexed with the orthorhombic phase of AgInS2.The incorporation of Mn^(2+)ions in the AIZS crystal lattice results in a red-shift of the photoluminescence(PL)emission maximum depending on the Mn^(2+)content.The PL quantum yields decrease upon loading with Mn^(2+)but remained high(53-31%)until 50%theoretical loading in Mn^(2+).Steady state,PL excitation and time-resolved PL measurements suggest that Mn^(2+)-dependent trap states are involved in the PL emission.Mn:AIZS QDs exhibit also magnetic properties.In addition,Mn:AIZS QDs can easily be transferred to the aqueous phase using the PMAO amphiphilic polymer without alteration of their optical properties(PL quantum yield up to 51%),revealing their high potential for biological applications.
