Molecular vibrations, activation energies of trapped carriers and additional structure in thermoluminescence of organic polymers

Sugakov, V. I.; Ostapenko, N. I.; Ostapenko, Yu.; Kerita, O.; Strelchuk, V. V.; Kolomys, O.

doi:10.1016/j.synthmet.2017.10.007

Cited by 6 publications

(11 citation statements)

References 32 publications

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“…The energy and temperature dependence of P(E, T) is smoother function of the energy and temperature than the dependence of the factor exp(−|E|/κT) on these parameters. Also, the structures observed in the works [8][9][10][11] and studied in the present work manifest themselves in a narrow range of temperatures, at which the value of P(E, T) changes insignificantly. The value P(E, T) will be considered as a constant parameter of the system when performing concrete calculations.…”

Section: Model Of the Systemsupporting

confidence: 56%

“…The first terms in the integrals of the equation ( 4) describe the contribution into the intensity of thermoluminescence from the vibrations with the strong carrier-vibration interaction. In our previous works [8][9][10], we studied the influence of this interaction on the thermoluminescence in the first order of the perturbation theory, in which the interaction was taken into account in a linear expansion with respect to the displacements of nuclei. In the work [11] we applied the mechanism of the resonance energy transfer from the optical vibration to the carrier, which jump from one molecule to another.…”

Section: The Separation Of a Single Molecular Vibration's Contributio...mentioning

confidence: 99%

“…The fine discrete structure on the thermoluminescence curve and the appearance of fictitious activation energies, when the fractional method was applied in the thermoluminescence study, were observed on different samples, for various substrates, and for several polymers poly(methylphenylsilane), poly(di-n-penthylsilane), poly(din-phenylsilane), poly(di-n-heptylsilane)) [8][9][10][11]. Si-Si vibrations with the energies of quanta 0.0462 eV and 0.061 eV in poly (di-n-hexylsilane) are examples of the vibrations, which give the structures on the thermoluminescence curve, they are observed under an application of the fractional thermoluminescece method [8][9][10][11] and are seen in Raman spectra [6]. The illustrative view is given in figure 2 for the vibration of poly(di − n − hexylsilane) molecule with the energy of quantum 0.0462 eV [12].…”

Section: Introductionmentioning

confidence: 99%

“…However more important is the fact that the existence of the considered phenomenon requires caution from the researcher in the interpretation of results concerning the trap levels obtained by the thermoluminescence methods. Really, according to the conclusions of the papers [8][9][10][11] the obtained activation energy may be rather the energy of a quantum of molecular vibrations.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fine structure of thermoluminescence assisted by molecular vibrations in disordered organic semiconductors

Sugakov¹

2022

J. Phys.: Condens. Matter

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The article deals with the issue of the influence of a separate mode of molecular vibrations on the formation of the thermoluminescence from disordered systems with quasi-continuous spectra of localized carriers. The contribution of vibrations is noticeable if the energy of their quanta is close to the depth of some localized carriers and the transition of the carrier into the conductive region occurs via absorption of these quanta. At some value of a carrier-vibration interaction, the effect manifests itself in the appearance of a fine discrete structure on the generally smooth thermoluminescence curve. The thermoluminescence of polymers is calculated using the model of non-adiabatic transitions, in which the carrier-vibrational interaction is determined by the displacements of nuclei in the presence of the carrier. The dependence of the arising discrete structure of the thermoluminescence curve on a number of parameters of the system like the magnitude of the carrier-vibration interaction, the width of vibrational levels, the parameters of the conductive region is investigated. The processes with participation of multiple quanta of vibrations are investigated and the formation of repetitive structures on the thermoluminescence curve has been shown owing to the absorption of several vibrational quanta. Analysis of a number of experiments is presented using the suggested theory.

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Section: Model Of the Systemsupporting

confidence: 56%

Section: The Separation Of a Single Molecular Vibration's Contributio...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fine structure of thermoluminescence assisted by molecular vibrations in disordered organic semiconductors

Sugakov¹

2022

J. Phys.: Condens. Matter

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“…Luminescence can also be observed again after radiation exposure of a specific wavelength. The phenomenon of thermoluminescence occurs mainly in dielectrics [11] but also in organic materials [12]. The thermoluminescence effect was firstly observed and described in 1663 by the English physicist Robert Boyle [13].…”

Section: Introductionmentioning

confidence: 99%

Ceramics, Glass and Glass-Ceramics for Personal Radiation Detectors

2021

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Different types of ceramics and glass have been extensively investigated due to their application in brachytherapy, radiotherapy, nuclear medicine diagnosis, radioisotope power systems, radiation processing of food, geological and archaeological dating methods. This review collects the newest experimental results on the thermoluminescent (TL) properties of crystalline and glassy materials. The comparison of the physico-chemical properties shows that glassy materials could be a promising alternative for dosimetry purposes. Furthermore, the controlled process of crystallization can enhance the thermoluminescent properties of glasses. On the other hand, the article presents information on the ranges of the linear response to the dose of ionizing radiation and on the temperature positions of the thermoluminescent peaks depending on the doping concentration with rare-earth elements for crystalline and glassy materials. Additionally, the stability of dosimetric information storage (fading) and the optimal concentration of admixtures that cause the highest thermoluminescent response for a given type of the material are characterized. The influence of modifiers addition, i.e., rare-earth elements on the spectral properties of borate and phosphate glasses is described.

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Effect of the polymer ordering on the optical spectra and thermoluminescence of polygermane and polysilane films and nanocomposites

Ostapenko

Kerita

Ostapenko

et al. 2019

Low Temperature Physics

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Comparative study of optical spectra and thermoluminescence of poly(di-n-hexylgermane) (PDHGe) and poly(di-n-hexylsilane) (PDHS) films and nanocomposites with different degrees of ordering have been carried out in the temperature range 5–200 K. The disordering processes, which are essential for PDHGe, lead to the appearance of additional bands in its optical spectra associated with different set of trans- and gauche-conformations of the polymer chain as well as to the broadening of vibrational bands in Raman spectrum. It is shown that polymer chains of confined PDHGe introduced into the nanopores of SBA-15 silica, in contrast to those of PDHS have the gauche-conformation instead of the trans-conformation, as a result of decrease of intermolecular interaction between the polymer chain segments and increase of their mobility. Besides, appearance of discrete levels of the carriers’ activation energy in thermoluminescence of both polymers were observed, energies of which coincide with the optical vibration quanta. Disordering processes cause reduction of the number of observed discrete levels of the activation energy for PDHGe.

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Molecular vibrations, activation energies of trapped carriers and additional structure in thermoluminescence of organic polymers

Cited by 6 publications

References 32 publications

Fine structure of thermoluminescence assisted by molecular vibrations in disordered organic semiconductors

Fine structure of thermoluminescence assisted by molecular vibrations in disordered organic semiconductors

Ceramics, Glass and Glass-Ceramics for Personal Radiation Detectors

Effect of the polymer ordering on the optical spectra and thermoluminescence of polygermane and polysilane films and nanocomposites

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