Influence of Temperature on the Fluorescence Duration and Electronic Spectra of Metal-Free Tetrapyrroles in an Organic Polymer

Spectral and luminescent characteristics and the duration of fluorescence were measured for a series of metal-free tetrapyrroles in polyvinylbutyral solid films at 293 and 77 K. The results provided evidence for the lack of a viscosity factor in the case of the fluorescence enhancement under study,...

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Bibliographic Details
Published inJournal of applied spectroscopy Vol. 89; no. 1; pp. 1 - 6
Main Authors Arabei, S. M., Bel’kov, M. V., Makarova, E. A., Pershukevich, P. P., Solovyov, K. N.
Format Journal Article
LanguageEnglish
Published New York Springer US 2022
Springer
Springer Nature B.V
Subjects
Analysis
Analytical Chemistry
Atomic/Molecular Structure and Spectra
Dielectric films
Electronic spectra
Fluorescence
Internal conversion
Physics
Physics and Astronomy
Polymers
Thin films
effect of fluorescence enhancement
absorption spectrum
fluorescence and fluorescence excitation spectrum
duration of fluorescence
metal-free tetrapyrroles
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Summary:Spectral and luminescent characteristics and the duration of fluorescence were measured for a series of metal-free tetrapyrroles in polyvinylbutyral solid films at 293 and 77 K. The results provided evidence for the lack of a viscosity factor in the case of the fluorescence enhancement under study, i.e., for the tetrapyrroles showing the enhancement effect in liquid solutions (tetraazaporphine and substituted tetraazachlorin). The fluorescence duration in the film increased insignificantly on lowering the temperature to 77 K. An analysis of the experimental data made it possible to estimate the quantum yields of internal conversion and intersystem crossing for tetraazaporphine and tetraazachlorin, which were the fundamental structures in the tetrapyrrole series.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-022-01316-6