Structural features and the effect of temperature memory in a vitrivied film of a europium(III) beta-diketonate complex

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Abstract

Confocal optical microscopy data with a resolution of 1 μm on the spatial heterogeneity of a vitrified film prepared from a melt powder of an anisometric europium(III) beta-diketonate complex are presented. It has been shown that the heterogeneity caused by crystalline inclusions in the amorphous structure of the film, leads to a temperature memory effect, when the film can be in different states at the same temperature.

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About the authors

D. V. Lapaev

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences»

Author for correspondence.
Email: d_lapaev@mail.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

V. G. Nikiforov

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences»

Email: d_lapaev@mail.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

D. K. Zharkov

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences»

Email: d_lapaev@mail.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

A. А. Knyazev

Kazan National Research Technological University

Email: d_lapaev@mail.ru
Russian Federation, Kazan

Yu. G. Galyametdinov

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences»; Kazan National Research Technological University

Email: d_lapaev@mail.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan; Kazan

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2. Fig. 1. Structural formula of the mesogenic beta-diketonate complex Eu(DK12-14)3phen (a). Photograph of a 20 μm vitrified Eu(DK12-14)3phen film (fixed between two quartz plates measuring 7×15×0.5 mm3) under daylight (b). Transmission spectrum of a 20 μm vitrified Eu(DK12-14)3phen film (c). Micrograph of the surface of the vitrified Eu(DK12-14)3phen film obtained in the crossed polarizers mode at 500-fold magnification (d).

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3. Fig. 2. Energy level diagram for the vitrified Eu(DK12-14)3phen film (a). Solid and dashed arrows indicate radiative and nonradiative transitions, respectively. Luminescence spectrum of the vitrified Eu(DK12-14)3phen film obtained with a 10 μs delay relative to the exciting laser pulse with a wavelength of 337 nm (b).

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4. Fig. 3. Normalized kinetics of Eu3+ luminescence at a wavelength of 610.5 nm in a vitrified Eu(DK12-14)3phen film. The solid line is a single-exponential approximation function with a correlation coefficient R2 = 0.99959.

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5. Fig. 4. Distribution of luminescence intensity on the surface of the vitrified Eu(DK12-14)3phen film under laser excitation at a wavelength of 405 nm, obtained on a confocal optical microscope (a). Luminescence spectra of the vitrified Eu(DK12-14)3phen film (b), measured in positions 1 and 2 in panel (a).

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