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Optical and morphological properties of single-phased and dual-emissive InP/ZnS quantum dots via transition metallic and inorganic ions.

Single-phased and dual-emissive nanocrystals with broad emission are attractive fluorescent materials for optoelectronic devices due to their unique properties. Up till now, the effect of different metallic cations and inorganic anions on III-V group QDs concenrning about luminescent features and crystalline growth has been less explored. In this work, dual-emissive InP/ZnS QDs single-doped by transition metal compounds (Cu2+, Ag+ or Mn2+) were synthesized to compare optical and morphological properties. The corresponding doping concentrations to realize dual emission with comparative intensity for Cu, Ag and Mn were 0.8%, 6% and 80%, which vary greatly and might be attributed to different precursor activity. As for the morphological and internal structrure, TEM images exhibit that transition metal ions have no obvious effect on the morphological properties and higher concentration of chloride anions binding with In-rich interface could conduce to homogenous distribution and triangular growth through the comparison of different metal chlorides as precursors. XPS results further demonstrate that the high resolution In 3d spectrum of Mn doped InP/ZnS QDs with MnCl2 is mainly dominated by In-P bonds, indicating less intermediate chemical states. These results concerning about well-defined InP/ZnS QDs could promote more diverse insight into surface chemistry and help to better understand the growth mechanism, which makes it possible to regulate InP/ZnS QDs into desired formats for different practical applications like white LEDs.