Investigation of the spectral properties of poymeric luminescent compositions doped with boron difluoride curcuminoids

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Resumo

Polymeric luminescent compositions based on polystyrene and polycarbonate doped with boron difluoride curcuminoids with different substituents in the phenyl ring have been synthesized. The influence of substituents, polymer matrix and phosphor concentration on the spectral properties of polymer compositions has been studied. It was found that the influence of the electron-donating power of the luminophore substituents on the emission characteristics of the films is similar to that of the solutions. Films doped with alkyl substituents (1a–5a) do not change their emission characteristics when the polymer matrix is changed, while compositions doped with 6a are characterised by positive solvatochromism. For all films, a batochromic shift of luminescence is observed when the luminophore concentration is increased to 0.5%. The films doped with 6a were found to exhibit delayed fluorescence.

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Sobre autores

A. Shchelokov

Far Eastern Federal University

Autor responsável pela correspondência
Email: shchelokov.ai@dvfu.ru
Rússia, Vladivostok

A. Khrebtov

Far Eastern Federal University; Russia Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: shchelokov.ai@dvfu.ru
Rússia, Vladivostok; Vladivostok

E. Fedorenko

Russia Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: shchelokov.ai@dvfu.ru
Rússia, Vladivostok

A. Mirochnik

Russia Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences

Email: shchelokov.ai@dvfu.ru
Rússia, Vladivostok

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2. 1. Structural formulas of curcuminoids: 1a – 2,2-difluoro6-phenyl-4-cinnamoyl-1,3,2-dioxaborine; 2a– 2,2-difluoro6-(4’-methylphenyl)-4-cinnamoyl-1,3,2-dioxaborine; 3a– 2,2-difluoro6-(4’-ethylphenyl)-4-cinnamoyl-1,3,2-dioxaborine; 4a – 2,2-difluorine-6-(3’,4’- dimethylphenyl)-4-cinnamoyl-1,3,2-dioxaborine; 5a – 2,2-difluorine-6-(2’,5’- dimethylphenyl)-4-cinnamoyl-1,3,2-dioxaborine; 6a – 2,2-difluoro6-(4’-methoxylphenyl)-4-cinnamoyl-1,3,2-dioxaborine.

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3. Fig. 2. The attenuation curve of the afterglow of a PC film doped with 6a at a phosphor concentration of 0.5%.

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4. 3. The spectrum of delayed fluorescence of a PC film doped with 6a at a concentration of 0.5% (a) and the luminescence spectrum of 6a crystals (b), decomposed by Gaussian functions.

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