Synthesis of Cd1-xMnxS Quantum Dots via Reverse Micelles and Its Photoluminescence Performance

Abstract

Abstract: Incorporation of diluted magnetic semiconductors (DMS) in quantum confined systems opens new possibilities for the spin-dependent electronics due to the combination of the exchange interaction and the quantum confinement. In this work, we focus on the synthesis and optical properties of Cd_1-xMn_xS quantum dots (QDs). Cd_1-xMn_xS quantum dots (QDs) were prepared via a reverse micelles. The size of dots was controlled by changing the ratio of w_o (w_o=[H₂O][AOT]). A series of Cd_1-xMn_xS QDs samples with w_o varying from³.5 to 5.5 were prepared. A high-resolution electron transmission microscopy (HRTEM) study of QDs with w_o=3.5 shows that the QDs are nearly mono-dispersed with an average diameter around 4.8 nm and the QDs are defects-free single crystals. The Cd_1-xMn_xS QDs size is varying from 4.8, 5.1, 5.3 to 6.0 nm with w_o varying from³.5, 4.5, 5.0 to 5.5. The molar fraction of Mn²⁺ in the Cd_1-xMn_xS dots is about 1.5% with respect to (Mn²⁺+Cd²⁺) determined by X-ray energy dispersion spectroscopy. Electron spin resonance spectroscopy shows that Mn²⁺ ions are in tetrahedral sites indicating that Mn²⁺ are incorporated into the CdS lattice. The absorption spectra of these samples exhibit a well-defined excitonic peak located from².88 eV to 3.28 eV corresponding to the different values of w_o. The longer wavelength of the absorption peak is exhibited with the larger w_o. Most interestingly, the photoluminescence emission peaks are red-shifted from².26 eV to 1.88 eV with increasing the w_o values from³.5 to 5.5. These emission peaks are believed to originate from the Mn²⁺ ⁴T₁-⁶A₁ transitions in associated states.

Key words: Quantum dots, Diluted magnetic semiconductors, Cd_1-xMn_xS, Reverse micelles, Photoluminescence

CLC Number:

O614

TrendMD:

PANG Qi, GUO Bi-Cheng, WANG Jian-Nong, YANG Shi-He, WANG Yu-Qi, GE Wei-Kun, GONG Meng-Liang, . Synthesis of Cd_1-xMn_xS Quantum Dots via Reverse Micelles and Its Photoluminescence Performance[J]. Chem. J. Chinese Universities, 2004, 25(9): 1593.

References

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