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9LD-P-2
LASER DIAGNOSTICS AND SPECTROSCOPY
Luminescent kinetics of the Quantum Dots inside Polymer with Different
Refractive Indexes
ALT'22
I. Kalaev1, A. Tarasevich1,2,3, A. Аrzhanov1'2'3, K. Magaryan1, A. Alentiev4, S. Chirkov4
1 - Moscow Pedagogical State University, 29/7 Malaya Pirogovskaya str., 119435 Moscow, Russia 2 - Institute for Spectroscopy, Russian Academy of Science, 5 Fizicheskaya str., 142190 Moscow, Troitsk, Russia 3 - PN. Lebedev Physical Institute of the Russian Academy of Sciences, 11 Fizicheskaya str.,
142190 Moscow, Troitsk, Russia 4 - A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Science, 29 Leninsky prospect, 119991 Moscow, Russia ka.magaryan@mpgu.edu
The actual problem in modern photonics is investigation of conduct of the single quantum emitter inside different matrices. More specific task is to provide experimental and theoretical research of the mutual influence of such emitters and local media. There is some progress in this task reflected in a few recent publications [1-3].
We report on the study of optical properties of the core/shell CdSe/CdS/ZnS quantum dots (QDs) inside commercial polymer - polyphenyleneoxide (PPO). PPO was chosen because of its ability to change its free volume when different temperatures are applied during film preparation. By changing the free volume of the polymer, its dielectric parameters, in particular the refractive index is altered. 7 samples with different volume were prepared in the temperature range of 20 - 50 °C.
QDs were embedded in all polymers during the process of synthesis with the same constant concentration. Then samples were characterized by luminescence and time-resolved spectroscopy.
Fig.1. Dependence of the CdSe/CdS/ZnS quantum dots fluorescence lifetime on the temperature of crystallization of the polymer matrix-host.
We see that with increasing of the preparation temperature crystallinity degree of the PPO matrix decreases and therefore its refractive index changes (fig. 1). The fluorescence lifetime of the QDs also tends to increase successively.
The work was carried out within the framework of the State Assignment of the Moscow Pedagogical State University (MPGU) "Physics of Nanostructured Materials: Fundamental Research and Applications in Materials Science, Nanotechnology and Photonics" with the support of the Ministry of Education of the Russian Federation (AAAA-A20-120061890084-9) together with the Centre for Collective Use "Structural Diagnostics of Materials" of the Federal Research Centre of the Russian Academy of Sciences "Crystallography and Photonics". The authors are members of the Leading Scientific School of the Russian Federation (grant of the President of the Russian Federation NSh- 776.2022.1.2).
[1] T.A. Anikushina, M.G. Gladush, A.A. Gorshelev and A.V. Naumov, Single-molecule spectromicroscopy: a route towards sub-wavelength refractometry, Faraday Discussions, vol. 184, pp. 263-274, (2015).
[2] N.A.Lozing et al., Stochastic superflares of photoluminescence from a single microdiamond with germanium-vacancy color centers: A general phenomenon or a unique observation, Physical Review B, vol.102, p.060301, (2020).
[3] O. Carion et al., Synthesis, encapsulation, purification and coupling of single quantum dots in phospholipid micelles for their use
in cellular and in vivo imaging, Nature Protocols, vol. 2, pp. 2383-2390, (2007).
