Effect of solvents on optical properties and dynamics of exciton states in quantum dots CdZnS/ZnS doped with Mn2+

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Abstract

The dynamics of differential absorption spectra of Mn2+ : Zn0.48Cd0.52S/ZnS quantum dots (QDs) after excitation with a femtosecond (fs) pulse of 360 nm in aprotonic nonpolar cyclohexane and polar propylene carbonate solvents in comparison with the protonic polar solvent water has been studied by femtosecond laser spectroscopy method. The absorption and luminescence spectra of QDs in water revealed bands related to trapped states. The fading band related to the edge exciton of QD attenuates significantly faster in water than in aprotonic solvents, which suggests 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 for the decrease in the quantum yield of manganese luminescence in Mn2+ : Zn0.48Cd0.52S/ZnS when passing from aprotonic solvents to water.

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About the authors

A. A. Vasin

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Author for correspondence.
Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

A. L. Dobryakov

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

A. N. Kostrov

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

E. E. Koroznikova

Moscow Institute of Physics and Technology

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny

F. E. Gostev

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

I. V. Shelaev

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

O. Yu. Antonova

N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Moscow

S. Yu. Kochev

A.N. Nesmeyanov Institute of Organoelement Compounds of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Moscow

V. A. Nadtochenko

Moscow Institute of Physics and Technology; N.N. Semenov Federal Research Center for Chemical Physics of the RAS

Email: a2vasin@yandex.ru
Russian Federation, Dolgoprudny; Moscow

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Supplementary files

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2. Fig. 1. Absorption spectra of Mn2+:ZnCdS/ZnS QDs dissolved in water 1, propylene carbonate 2 and cyclohexane 3. (a) Spectra in the form of second derivatives, (b) absorption spectra.

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3. Fig. 2. Luminescence spectra of Mn2+:ZnCdS/ZnS QDs dissolved in water 1, propylene carbonate 2 and cyclohexane 3 at excitation at 360 nm. (a) Luminescence spectra in the form of the second derivative, (b) luminescence spectra.

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4. Fig. 3. Differential spectra of Mn2+:ZnCdS/ZnS after excitation with a 360 nm (3.44 eV) pulse for QDs dissolved in cyclohexane, propylene carbonate and water.

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5. Fig. 4. Transient absorption spectra of Mn2+:ZnCdS/ZnS QDs dissolved in cyclohexane (a), propylene carbonate (b) and water (c). The inset in Fig. (b) shows the BL1 decay kinetics for QDs dissolved in cyclohexane (line 1) and propylene carbonate (line 2). Spectrum delay time in picoseconds. The dash-dotted line shows the absorption spectrum of QDs as the second derivative.

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6. Fig. 5. Averaged spectra of combined scattering of QDs dissolved in cyclohexane (black spectrum) and QDs dissolved in water (gray spectrum).

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