Abstract
We report on the synthesis of diluted magnetic semiconductor Cd 1− x Mn x S quantum dots (QDs) by the reverse micelle method using H 2S as the sulfur source. The Cd 1− x Mn x S QDs size ranging from ∼3.2 to ∼4.2 nm can be systematically controlled by the amount of H 2S added and is characterized by high-resolution transmission electron microscopy. Manganese compositions in the QDs are estimated by energy dispersive spectrometry to be up to ∼3%. Electron spin resonance spectra analysis indicates that Mn 2+ are incorporated into the CdS lattice by substituting Cd 2+ sites. Optical absorption spectra of the Cd 1− x Mn x S QDs exhibit well-defined excitonic peaks resulting from the quantum-confinement effect. The peak position and absorption edge show systematic changes with the QDs sizes and Mn 2+ compositions.
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