Photoinduced transformations of optical properties of CdSe and Ag-In-S nanocrystals embedded in the films of polyvinyl alcohol

Lyudmyla V. Borkovska; Olexander Gudymenko; Olexander Stroyuk; Alexandra Raevskaya; Olena Fesenko; Tetyana Kryshtab; Lyudmyla V. Borkovska; Olexander Gudymenko; Olexander Stroyuk; Alexandra Raevskaya; Olena Fesenko; Tetyana Kryshtab

doi:10.3934/matersci.2016.2.658

AIMS Materials Science

2016, Volume 3, Issue 2: 658-668. doi: 10.3934/matersci.2016.2.658

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Photoinduced transformations of optical properties of CdSe and Ag-In-S nanocrystals embedded in the films of polyvinyl alcohol

1.
V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences (NAS) of Ukraine, 41 Pr. Nauky, 03028 Kyiv, Ukraine
2.
L. Pysarzhevsky Institute of Physical Chemistry of NAS of Ukraine, 31 Pr. Nauky, 03028 Kyiv, Ukraine
3.
Institute of Physics of NAS of Ukraine, 46 Pr. Nauky, 03028 Kyiv, Ukraine
4.
Instituto Politécnico Nacional – ESFM, Av. IPN, Ed.9 U.P.A.L.M., 07738 Mexico D.F., Mexico

Received: 31 March 2016 Accepted: 27 May 2016 Published: 01 June 2016

The results of investigation of photostability of the composites of CdSe and Ag-In-S nanocrystals (NCs) embedded in the films of polyvinyl alcohol (PVA) are presented. The films were studied by photoluminescence (PL), optical absorption, micro-Raman and X-ray diffraction methods. It is found that heating of the films to 100 °C promotes PVA crystallization and stimulates an increase of the PL intensity for the NCs of both types. The latter effect is ascribed mainly to the improvement of NC surface passivation by functional groups of PVA. The illumination with the 409-nm LED’s light enhances PL intensity for CdSe NCs and decreases it for Ag-In-S NCs as well as results in the darkening of the films. The color of the Ag-In-S-PVA film restores with time, while the change of the optical properties of the CdSe-PVA composite is irreversible. The possible mechanisms of the revealed effects, such as structural transformations at NC/PVA interface as well as the formation of new light-absorbing species are discussed.
- nanoparticles,
- cadmium selenide,
- silver indium sulfide,
- photoinduced transformations,
- photoluminescence,
- micro-Raman
Citation: Lyudmyla V. Borkovska, Olexander Gudymenko, Olexander Stroyuk, Alexandra Raevskaya, Olena Fesenko, Tetyana Kryshtab. Photoinduced transformations of optical properties of CdSe and Ag-In-S nanocrystals embedded in the films of polyvinyl alcohol[J]. AIMS Materials Science, 2016, 3(2): 658-668. doi: 10.3934/matersci.2016.2.658

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Abstract

The results of investigation of photostability of the composites of CdSe and Ag-In-S nanocrystals (NCs) embedded in the films of polyvinyl alcohol (PVA) are presented. The films were studied by photoluminescence (PL), optical absorption, micro-Raman and X-ray diffraction methods. It is found that heating of the films to 100 °C promotes PVA crystallization and stimulates an increase of the PL intensity for the NCs of both types. The latter effect is ascribed mainly to the improvement of NC surface passivation by functional groups of PVA. The illumination with the 409-nm LED’s light enhances PL intensity for CdSe NCs and decreases it for Ag-In-S NCs as well as results in the darkening of the films. The color of the Ag-In-S-PVA film restores with time, while the change of the optical properties of the CdSe-PVA composite is irreversible. The possible mechanisms of the revealed effects, such as structural transformations at NC/PVA interface as well as the formation of new light-absorbing species are discussed.

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