Luminescence of polymer compositions doped with boron difluoride curcuminoids

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Polymer luminescent compositions based on polystyrene and polycarbonate doped with symmetrical and asymmetrical curcuminoids of boron difluoride were obtained. The effect of substituents in dye molecules, polymer matrix and phosphor concentration on the spectral properties of polymer composites was studied. With an increase in the electron-donor effect of substituents, a bathochromic shift of the luminescence maxima of symmetric and asymmetric phosphors is observed. Positive solvatochromism for boron difluoride curcuminoids in polymers manifests itself for asymmetric curcuminoids. For films, a bathochromic shift of luminescence is observed with an increase in the phosphor concentration from 0.01 to 0.5%. In a PC film doped with a symmetric dye with a methoxy group, delayed fluorescence due to the formation of excimers was detected at room temperature.

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作者简介

A. Shchelokov

Institute of Chemistry, Far Eastern Branch of the RAS; Far Eastern Federal University, Russky Island

编辑信件的主要联系方式.
Email: shchelokov.ai@dvfu.ru
俄罗斯联邦, Vladivostok; Vladivostok

A. Zapol’skii

Far Eastern Federal University, Russky Island

Email: shchelokov.ai@dvfu.ru
俄罗斯联邦, Vladivostok

E. Fedorenko

Institute of Chemistry, Far Eastern Branch of the RAS

Email: shchelokov.ai@dvfu.ru
俄罗斯联邦, Vladivostok

A. Mirochnik

Institute of Chemistry, Far Eastern Branch of the RAS

Email: shchelokov.ai@dvfu.ru
俄罗斯联邦, Vladivostok

S. Golik

Far Eastern Federal University, Russky Island

Email: shchelokov.ai@dvfu.ru
俄罗斯联邦, Vladivostok

参考

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2. Fig. 1. Structural formulas of boron difluoride curcuminoids 1–8: 1 – 2,2-difluoro-4,6-bis(cinnamoyl)-1,3,2-dioxaborine; 2 – 2,2-difluoro-4,6-bis(cinnamoyl)-5-methyl-1,3,2-dioxaborine; 3 – 2,2-difluoro-1,7-bis(2-oxacyclopenta-1,3-diene)-1,3,2-dioxaborine; 4 – 2,2-difluoro-4,6-bis(p-methoxycinnamoyl)-1,3,2-dioxaborine; 5 – 2,2-difluoro-6-(naphth-2′-yl)-4-cinnamoyl-1,3,2-dioxaborine; 6 – 2,2-difluoro-6-(9′ N -fluoren-2′-yl)-4-cinnamoyl-1,3,2-dioxaborine; 7 – 2,2-difluoro-6-(1′-phenylphen-4′-yl)-4-cinnamoyl-1,3,2-dioxaborine; 8 – 2,2-difluoro-6-(trans-1′,2′-diphenylethylene-4′-yl)-4-cinnamoyl-1,3,2-dioxaborine.

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3. Fig. 2. Luminescence spectra of PC films doped with symmetric phosphors 1–4 at concentrations of 0.01% (a) and 0.5% (b).

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4. Fig. 3. Fluorescence spectra and PF of PC film doped with 6 at a concentration of 0.5%.

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5. Fig. 4. Afterglow decay curve (a) and photographs of PC film (b) doped with 6 (concentration 0.5%) under laser irradiation (λ = 405 nm) and after cessation of irradiation.

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6. Fig. 5. Luminescence spectrum of crystals 6 (a) and the delayed fluorescence spectrum of PC film doped with 6 at a concentration of 0.5% (b), expanded according to Gaussian functions.

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