Abstract
Manganese-doped cadmium selenium quantum dots (Mn-doped CdSe QDs) were successfully synthesized in the absence of trioctylphosphine (TOP) at various ripening temperatures and times. The TEM image shows the QDs with average particles size of 5.3nm with almost spherical shape. The optical properties of Mn-doped CdSe QDs were investigated using ultraviolet-visible and photoluminescence spectroscopy. The behavior of Mn-doped CdSe QDs was monitored using the red-shift characteristics in the UV-Vis absorption spectra, and their size variations were estimated by the quantum confinement theory. The PL emission spectra of Mn-doped CdSe QDs shows similar evolution behavior as in the absorption behavior. Quantum confinement allows tuning of the CdSe bandgap energy across the Mn excited-state energies. The origin of stokes shift were discovered.
Highlights
Doping nanocrystals with transition metal ions such as Mn2+ produces diluted magnetic semiconductor that could be used in spintronic devices
This is due to the effect of giant Zeeman splitting effect which results from the exchange interaction between the transition metal ions and the electronic states of the host nanocrystals [1]
This indicates that the Quantum Dots (QDs) size are increases with the increase of temperature and time
Summary
Doping nanocrystals with transition metal ions such as Mn2+ produces diluted magnetic semiconductor that could be used in spintronic devices. This is due to the effect of giant Zeeman splitting effect which results from the exchange interaction between the transition metal ions and the electronic states of the host nanocrystals [1]. The control of doping nanocrystals with transition metal ions has become fundamental interest in scientific research as well as in the application of spintronics. Mikulec et al [6], has successfully synthesized Mn-doped CdSe QDs using specially designated precursor at high temperature pyrolysis. Quantum confinement effect is occurred as the size of QDs is tunable with ripening temperature and time
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