Abstract
Highly panchromatic luminescent CdTexSe1−x alloy quantum dots (QDs) with emissions from blue to red regions are synthesized using a one-step method in aqueous solution with 3-mercaptopropionic acid (3-MPA) as stabilizer. The structure, shape, and spectral properties of these alloy QDs are investigated. The structure of the obtained CdTexSe1−x QDs is consistent with the zinc-blende crystal structure, with a nearly spherical shape having diameter of 4–7nm. The CdTexSe1−x QDs exhibit an absorbance wavelength ranging from 460nm to 700nm, and the maximum quantum yield (QY) approaches 28% for CdTe0.5Se0.5 alloy QDs with a reflux time of 0.5h. The emission wavelength of CdTexSe1−x QDs can be continuously tuned from 500nm to 720nm by controlling the size and composition of the alloy QDs, indicating their potential use in semiconductor-sensitized solar cells.
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