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Abstract <p>The dynamics of differential absorption spectra of Mn<sup>2+</sup>:Zn<sub>0.48</sub>Cd<sub>0.52</sub>S/ZnS quantum dots (QDs) after femtosecond pulse excitation at 360 nm in aprotic nonpolar cyclohexane and polar propylene carbonate solvents has been studied using femtosecond laser spectroscopy in comparison with the protic polar solvent water. Bands related to trap states were revealed in the absorption and luminescence spectra of QDs in water. The bleaching band related to the edge exciton of the quantum dots decays in water much faster than in the aprotic solvents, suggesting rapid electron transfer from the 1Se level to trap states in competition with electron transfer to manganese. Apparently, the competition of these processes is the reason behind the decrease in the quantum yield of manganese luminescence in Mn<sup>2+</sup>:Zn<sub>0.48</sub>Cd<sub>0.52</sub>S/ZnS on passing from aprotic solvents to water.</p>

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Influence of Solvents on Optical Properties and Dynamics of Exciton States in Mn2+-Doped CdZnS/ZnS Quantum Dots

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. A. Vasin,
  • A. L. Dobryakov,
  • A. N. Kostrov,
  • E. E. Koroznikova,
  • F. E. Gostev,
  • I. V. Shelaev,
  • O. Yu. Antonova,
  • S. Yu. Kochev,
  • V. A. Nadtochenko

摘要

Abstract

The dynamics of differential absorption spectra of Mn2+:Zn0.48Cd0.52S/ZnS quantum dots (QDs) after femtosecond pulse excitation at 360 nm in aprotic nonpolar cyclohexane and polar propylene carbonate solvents has been studied using femtosecond laser spectroscopy in comparison with the protic polar solvent water. Bands related to trap states were revealed in the absorption and luminescence spectra of QDs in water. The bleaching band related to the edge exciton of the quantum dots decays in water much faster than in the aprotic solvents, suggesting rapid electron transfer from the 1Se level to trap states in competition with electron transfer to manganese. Apparently, the competition of these processes is the reason behind the decrease in the quantum yield of manganese luminescence in Mn2+:Zn0.48Cd0.52S/ZnS on passing from aprotic solvents to water.