Abstract
ZnSe quantum dots doped with Co2+ have been prepared in aqueous solution by a one-pot method using thioglycolic acid as stabilizer. The quantum dots were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV–visible spectrophotometry, and spectrofluorimetry. The results confirmed the quantum dots formed a single cubic phase with zinc blende structure. The average particle size of the quantum dots was approximately 5 nm. Co2+ ions were doped into ZnSe lattice sites by substitution. As a result, infrared (IR) emission of Co2+4T2(F) → 4A2(F) at approximately 3.5 μm was detected on excitation with 755 nm radiation.
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