Optics and Spectroscopy
RUS  ENG    JOURNALS   PEOPLE   ORGANISATIONS   CONFERENCES   SEMINARS   VIDEO LIBRARY   PACKAGE AMSBIB  
General information
Latest issue
Archive

Search papers
Search references

RSS
Latest issue
Current issues
Archive issues
What is RSS



Optics and Spectroscopy:
Year:
Volume:
Issue:
Page:
Find






Personal entry:
Login:
Password:
Save password
Enter
Forgotten password?
Register


Optics and Spectroscopy, 2020, Volume 128, Issue 8, Pages 1100–1107
DOI: https://doi.org/10.21883/OS.2020.08.49705.21-20
(Mi os328)
 

This article is cited in 4 scientific papers (total in 4 papers)

Spectroscopy of condensed matter

Influence of binder and dyes on the mechanism of tunnel luminescence of AgBr(I) microcrystals

A. V. Tyurin, S. A. Zhukov, A. Yu. Akhmerov

I. I. Mechnikov Odessa National University
Full-text PDF (271 kB) Citations (4)
Abstract: It has been previously found that, in the AgBr(I) emulsion microcrystals (with a silver content corresponding to pBr 4), the centers responsible for tunnel recombination at $T$ = 77 K with a luminescence maximum at $\lambda_{\operatorname{max}}\approx$ 560 nm when excited by light from the absorption region of the AgBr(I) emulsion microcrystal ($\lambda\approx$ 450 nm) as a result of temperature “quenching” are subject to structural transformation into the centers that, under the same excitation, provide the tunnel recombination with a wavelength depending on a binder: $\lambda_{\operatorname{max}}\approx$ 720 nm for the AgBr(I) emulsion microcrystals obtained in water and $\lambda_{\operatorname{max}}\approx$ 750 nm for those obtained in gelatin. In this work, similar structural transformations of the centers that determine the tunnel recombination at $\lambda_{\operatorname{max}}\approx$ 560 nm to the centers with a glow at $\lambda_{\operatorname{max}}\approx$ 720 nm are implemented for the AgBr(I) emulsion microcrystals synthesized in polyvinyl alcohol at an increase in the content of silver ions in the emulsion from pBr 4 to pBr 7. The mobile interstitial silver ions Ag$_{i}^{+}$ are responsible for this transformation, as follows from the results obtained. The effect of the binder on the recombination processes in the AgBr(I) emulsion microcrystals is manifested in changes in the kinetics of the increase in luminescence from $\lambda_{\operatorname{max}}\approx$ 560 nm when light is excited from the absorption region of the AgBr(I) emulsion microcrystal ($\lambda\approx$ 450 nm) to a stationary level. The increase in luminescence at $\lambda_{\operatorname{max}}\approx$ 560 nm occurs monotonously from zero to the maximum stationary level at the binder whose molecules do not interact with the centers Ag$_{in}^{+}$, $n$ = 1, 2 (water, polyvinyl alcohol at pBr 4). The kinetics of the increase in luminescence in the AgBr (I) emulsion microcrystals to a stationary level at $\lambda$ $\approx$ 560 nm and pBr 4 is characterized by the presence of “flash enhancement” at a binder (in our case, gelatin (G)) whose molecules form the (Ag$_{{in}}^{0}$ G$^+$) complexes with the Ar$_{in}^{+}$ ($n$ = 1, 2) centers. The adsorption on the AgBr(I) emulsion microcrystal (polyvinyl alcohol) surface of the dye is manifested as follows: if the kinetics of increase in luminescence at $\lambda_{\operatorname{max}}\approx$ 560 nm when excited by light from the region of the AgBr(I) emulsion microcrystal absorption ($\lambda\approx$ 450 nm) to the stationary level demonstrates “flash enhancement” prior to the introduction of dye, then, after the introduction of dye, the increase in luminescence at $\lambda_{\operatorname{max}}\approx$ 560 nm occurs monotonically from zero to a maximum fixed level. Studies of the “flash” of the luminescence stimulated by infrared (IR) radiation have shown that, after the termination of the exciting light when the kinetics of the increase in luminescence from $\lambda_{\operatorname{max}}\approx$ 560 nm to a stationary level demonstrates “flash enhancement”, the “flash” stimulated by IR radiation is not observed at $\lambda\approx$ 560 nm. In the absence of “flash enhancement”, a “flash” at $\lambda\approx$ 560 nm is observed. The results obtained, from our point of view, indicate that “flash enhancement” is due to the presence of deep centers of the localization of the electrons with a small capture cross-section and not to a photochemical reaction stimulated by the exciting light.
Keywords: AgBr(I) microcrystals, emulsions, glow centers, enhancement of luminescence.
Received: 30.01.2020
Revised: 30.01.2020
Accepted: 15.04.2020
English version:
Optics and Spectroscopy, 2020, Volume 128, Issue 8, Pages 1110–1117
DOI: https://doi.org/10.1134/S0030400X2008038X
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: A. V. Tyurin, S. A. Zhukov, A. Yu. Akhmerov, “Influence of binder and dyes on the mechanism of tunnel luminescence of AgBr(I) microcrystals”, Optics and Spectroscopy, 128:8 (2020), 1100–1107; Optics and Spectroscopy, 128:8 (2020), 1110–1117
Citation in format AMSBIB
\Bibitem{TyuZhuAkh20}
\by A.~V.~Tyurin, S.~A.~Zhukov, A.~Yu.~Akhmerov
\paper Influence of binder and dyes on the mechanism of tunnel luminescence of AgBr(I) microcrystals
\jour Optics and Spectroscopy
\yr 2020
\vol 128
\issue 8
\pages 1100--1107
\mathnet{http://mi.mathnet.ru/os328}
\crossref{https://doi.org/10.21883/OS.2020.08.49705.21-20}
\elib{https://elibrary.ru/item.asp?id=44045913}
\transl
\jour Optics and Spectroscopy
\yr 2020
\vol 128
\issue 8
\pages 1110--1117
\crossref{https://doi.org/10.1134/S0030400X2008038X}
Linking options:
  • https://www.mathnet.ru/eng/os328
  • https://www.mathnet.ru/eng/os/v128/i8/p1100
  • This publication is cited in the following 4 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Optics and Spectroscopy Optics and Spectroscopy
     
      Contact us:
     Terms of Use  Registration to the website  Logotypes © Steklov Mathematical Institute RAS, 2024