Bodyk R.E., Khrebtov A.A., Tret’yakova G.O., Fedorenko E.V., Mirochnik A.G.
2024-07-23 citations by CoLab: 1 Abstract
Luminescent polymer composites based on polycarbonate and polystyrene doped with boron difluoride β-ketoiminates have been synthesized. The luminescence properties of 12 dyes with various substituents have been studied. The effect of the boron difluoride β-ketoiminate concentration on the spectral properties of the samples has been studied. It has been found that the studied dyes exhibit monomer luminescence even with a tenfold increase in the luminophore concentration (from 0.05 to 0.5%). It has been revealed that composites containing boron difluoride 3-amino-1-phenyl-2-buten-1-onate (1a) and boron difluoride 3-methylamino-1-phenyl-2-buten-1-onate (2a) dyes in polystyrene exhibit exciplex luminescence.
Khrebtov A.A., Fedorenko E.V., Beloliptsev A.Y., Mirochnik A.G.
2024-04-01 citations by CoLab: 1 Abstract
Donor-acceptor systems exhibiting exciplex luminescence attract much attention due to the wide prospects for their application in the field of OLEDs, nonlinear optics and lasers. Difluoroboron β-diketonates (BF2bdks) are a well-known class of organic dyes, which are able to form effective exciplex fluorescence, but this process has not received due attention for practical application. Strong donor-acceptor interaction in polyvinylcarbazole (donor) and BF2bdks derivatives (acceptor) binary system induces deeply red-shifted emission of charge-transfer complexes and exciplexes with a large bathochromic shift up to ∼170 nm relative to conventional monomeric luminescence. The results of quantum chemistry simulation are in agreement with the experiment data. Luminescence color tuning of the film are capable by the dye concentration, the donor-acceptor properties of the dye substituents and even the excitation wavelength. White light broad spectrum of a dual luminescence of the investigated binary systems has CIE chromaticity coordinates (0.35; 0.33) close to the standard neutral white light CIE coordinates (0.33; 0.33). This study will facilitate photophysical research and industrial applications of donor-acceptor binary systems based on polymer materials.
Fedorenko E.V., Lyubykh N.A., Khrebtov A.A., Yu. Beloliptsev A., Mirochnik A.G.
Molecular systems with intense exciplex luminescence are promising for the creation of OLEDs and light-transforming materials. The luminescent properties of difluoroboron meta- and para-nitrodibenzoylmethanates (1 and 2) were studied by the steady-state and time-resolved luminescence spectroscopy methods and quantum chemistry simulation. The influence of the position of the nitro group on the spectral properties of the complexes was revealed. The nitro group withdraws the electron density upon photoexcitation in the para-isomer in contrast to the meta-isomer. The bond order of the CC bond between the phenyl and chelate rings decreases in the excited relaxed state of 2, which leads to rotation of the substituent and a low quantum yield. Formation of exciplexes of 1 and 2 in benzene, toluene and polystyrene was found. The formation of the ground and excited-state electron donor-acceptor complexes based on difluoroboron nitrodibenzoylmethanates and benzene was revealed. The TDDFT method showed that the complexes are characterized by the presence of short contacts between the fluorine atom of the dye molecule and the hydrogen atoms of the aromatic hydrocarbon molecule. These contacts shorten during the transition from the ground state to the excited state. Polymeric compositions based on polystyrene (PS) and poly(methyl methacrylate) (PMMA) doped with 1 and 2 were obtained. The luminescence intensity of dyes 1 and 2 increases during the transition from PMMA to PS. A significant bathochromic shift of the luminescence maximum of 1 is observed, which is associated with the formation of exciplexes and triplexes. The obtained polymeric materials are promising for the development of optical smart materials.
Khrebtov A.A., Fedorenko E.V., Mirochnik A.G.
Polymer Q1 Q2
2022-09-01 citations by CoLab: 8 Abstract
Great potential has been discovered in the development of materials with a long afterglow (phosphorescence at room temperature and delayed fluorescence) for the purposes of luminescent sensing, bioimaging, information encryption and OLED. Here, we report the long-lived (lifetime up to 1.5 s) laser-induced room-temperature excimer delayed fluorescence (RTEDF) of difluoroboron β-diketonate complexes (BF 2 bdks) already at concentrations of 0.05% in solution cast polymer films. The emission centers of RTEDF of BF 2 bdks can retain for a long time in the polycarbonate matrix (>3 months) and can be repeatedly re-excited with a low-intensity ultraviolet light source. These results provide a foundation for the design of materials with applications in optical information storage and data encryption and decryption. • Difluoroboron β-diketonates form excimers in polymer films under laser irradiation. • Bright room-temperature excimer delayed fluorescence in polymers was revealed. • Lifetime of excimer delayed fluorescence is up to 1.5 s. • Excimer delayed fluorescence can retain for a long time (>3 months). • This phenomenon can be used for optical information storage and data encryption.
Khrebtov A.A., Fedorenko E.V., Reutov V.A., Mirochnik A.G., Lim L.A.
2022-08-01 citations by CoLab: 5 Abstract
The spectral properties of difluoroboron β‑diketonates in a polystyrene matrix have been studied. A bathochromic shift of the fluorescence bands of dyes in the steady-state luminescence spectra during the transition from solutions to polymer films was revealed, which is associated with the self-absorption of dyes. It is shown that the use of a mask for excitation of a small section of the film is a simple and convenient method for preventing the effect of dye self-absorption in the film on the structure of the fluorescence spectrum.
Khrebtov A.A., Fedorenko E.V., Beloliptsev A.Y., Mirochnik A.G.
The spectral properties and solvatochromic behavior of boron difluoride ortho-hydroxydibenzoylmethanates in polymer matrices with different polarity (polystyrene, polyvinyl chloride, polycarbonate, poly(methyl methacrylate)) were investigated. The specific interaction of polystyrene, polycarbonate and poly(methyl methacrylate) with the investigated fluorophores was revealed. It was shown that the dyes are capable to form exciplexes with phenyl rings of polystyrene. The spectral properties of polystyrene films doped with boron difluoride ortho-hydroxydibenzoylmethanates, which were obtained by the pouring method, significantly depend on the solvent from which they were formed. This makes it possible to control the luminescence color of the films at the manufacturing stage.
Fedorenko E.V., Khrebtov A.A., Mirochnik A.G., Ishtokina E.Y., Reutov V.A., Lim L.A.
2021-07-01 citations by CoLab: 9 Abstract
The spectral properties of the films based on optically transparent polymer materials with different polarity (polystyrene, polycarbonate) doped with dimethylaminostyryl β-diketonates of boron difluoride were studied. The transition from the less polar PS matrix to the more polar PC matrix leads to a solvatochromic effect due to internal charge transfer. The existence of two emitting centers in the polymer compositions was revealed: the monomeric luminescence and the luminescence of aggregates. The ratio between numbers of the emitting centers depends on the method of the film formation. Luminescence of polymer films doped with β-diketonates of boron difluoride has higher quantum yield than luminescence of solutions due to the formation of aggregates. The registration method has a significant effect on the structure of the steady-state luminescence spectra of the films. The substrate effect can be used to intensify the short-lived emission process.
Fedorenko E.V., Khrebtov A.A., Mirochnik A.G., Nefedov P.S., Lim L.A., Reutov V.A., Pavlov I.S., Sergeev A.A.
Luminescent polymer compositions based on polystyrene (PS), polycarbonate (PC), and polymethyl methacrylate (PMMA) doped with dibenzoylmethanate boron difluoride (DBMBF2), anthracene–acetonate boron difluoride (AntAcBF2), and their mixture have been investigated. The maximum quantum yield of luminescence has been demonstrated by the composition based on PS. The role of PS in increasing the efficiency of energy transfer from the donor (DBMBF2) to the acceptor (AntAcBF2) has been established and appeared to be caused by the formation of exciplexes of DBMBF2 with phenyl rings of PS.
Khrebtov A.A., Fedorenko E.V., Lim L.A., Reutov V.A.
It has been revealed that a sensitized luminescence of AntAcBF2 is observed in the boron difluoride dibenzoylmethanate (DBMBF2)–boron difluoride anthracenoylacetonate (AntAcBF2) system in the polystyrene matrix. The emission mechanism of energy transfer from DBMBF2 to AntAcBF2 has been established. The luminescence properties of bilayer films with one layer containing DBMBF2 and another one containing AntAcBF2 have been investigated. At luminophore contents in equimolar quantities, one observes a white luminescence of the bilayer polymer composite.
Khrebtov A.A., Fedorenko E.V., Reutov V.A.
In this paper we investigated polymeric luminescent compositions based on polystyrene doped with beta diketonates boron difluoride. Transparent films with effective absorption in the ultraviolet and blue regions of the spectrum were obtained. Polymeric luminescent compositions based on the mixture of dyes allow expanding the absorption region and increase the radiation shift. A luminescent solar concentrator consisting of a glass plate coated with such film can be used for photovoltaic window application.
Fedorenko E.V., Mirochnik A.G., Gerasimenko A.V., Lyubykh N.A., Beloliptsev A.Y., Mayor A.Y., Egorov A.E., Kostyukov A.A., Burtsev I.D., Nguyen T.M., Shibaeva A.V., Markova A.A., Kuzmin V.A.
2025-03-01 citations by CoLab: 0
Bodyk R.E., Khrebtov A.A., Tretyakova G.O., Fedorenko E.V., Mirochnik A.G.
2024-12-26 citations by CoLab: 0 Abstract
Polymeric luminescent compositions based on polycarbonate and polystyrene doped with β-ketoiminates of boron difluoride were obtained. The luminescent properties of 12 dyes with different substituents were investigated. The influence of the concentration of boron difluoride βketoiminates on the spectral properties of the samples was studied. It was found that the investigated dyes are characterized by monomeric luminescence even at tenfold increase of luminophore concentration (0.05–0.5%). It was found that compositions containing the dyes 3-amino-1-phenyl-2-buten-1-oneate of boron difluoride (1a) and 3-amino-1-phenyl-2-buten-1-oneate of boron difluoride (2a) exhibit exciplex luminescence in polystyrene.
Bodyk R.E., Khrebtov A.A., Tret’yakova G.O., Fedorenko E.V., Mirochnik A.G.
2024-07-23 citations by CoLab: 1 Abstract
Luminescent polymer composites based on polycarbonate and polystyrene doped with boron difluoride β-ketoiminates have been synthesized. The luminescence properties of 12 dyes with various substituents have been studied. The effect of the boron difluoride β-ketoiminate concentration on the spectral properties of the samples has been studied. It has been found that the studied dyes exhibit monomer luminescence even with a tenfold increase in the luminophore concentration (from 0.05 to 0.5%). It has been revealed that composites containing boron difluoride 3-amino-1-phenyl-2-buten-1-onate (1a) and boron difluoride 3-methylamino-1-phenyl-2-buten-1-onate (2a) dyes in polystyrene exhibit exciplex luminescence.
Khrebtov A.A., Fedorenko E.V., Beloliptsev A.Y., Mirochnik A.G.
2024-04-01 citations by CoLab: 1 Abstract
Donor-acceptor systems exhibiting exciplex luminescence attract much attention due to the wide prospects for their application in the field of OLEDs, nonlinear optics and lasers. Difluoroboron β-diketonates (BF2bdks) are a well-known class of organic dyes, which are able to form effective exciplex fluorescence, but this process has not received due attention for practical application. Strong donor-acceptor interaction in polyvinylcarbazole (donor) and BF2bdks derivatives (acceptor) binary system induces deeply red-shifted emission of charge-transfer complexes and exciplexes with a large bathochromic shift up to ∼170 nm relative to conventional monomeric luminescence. The results of quantum chemistry simulation are in agreement with the experiment data. Luminescence color tuning of the film are capable by the dye concentration, the donor-acceptor properties of the dye substituents and even the excitation wavelength. White light broad spectrum of a dual luminescence of the investigated binary systems has CIE chromaticity coordinates (0.35; 0.33) close to the standard neutral white light CIE coordinates (0.33; 0.33). This study will facilitate photophysical research and industrial applications of donor-acceptor binary systems based on polymer materials.
Kim E.E., Il’ina T.M., Kononevich Y.N., Ionov D.S., Khanin D.A., Nikiforova G.G., Muzafarov A.M.
Crosslinked polysiloxanes with boron bis(dibenzoylmethanate) complexes used as crosslink junctions of polymer networks are first synthesized, and their physicochemical, mechanical, thermal, and fluorescent properties are studied. It is shown that the polymers under study feature the elastic behavior, possess high thermal and thermo-oxidative stability, and exhibit intense fluorescence in a wide wavelength range (400‒700 nm).
Fedorenko E.V., Lyubykh N.A., Khrebtov A.A., Yu. Beloliptsev A., Mirochnik A.G.
Molecular systems with intense exciplex luminescence are promising for the creation of OLEDs and light-transforming materials. The luminescent properties of difluoroboron meta- and para-nitrodibenzoylmethanates (1 and 2) were studied by the steady-state and time-resolved luminescence spectroscopy methods and quantum chemistry simulation. The influence of the position of the nitro group on the spectral properties of the complexes was revealed. The nitro group withdraws the electron density upon photoexcitation in the para-isomer in contrast to the meta-isomer. The bond order of the CC bond between the phenyl and chelate rings decreases in the excited relaxed state of 2, which leads to rotation of the substituent and a low quantum yield. Formation of exciplexes of 1 and 2 in benzene, toluene and polystyrene was found. The formation of the ground and excited-state electron donor-acceptor complexes based on difluoroboron nitrodibenzoylmethanates and benzene was revealed. The TDDFT method showed that the complexes are characterized by the presence of short contacts between the fluorine atom of the dye molecule and the hydrogen atoms of the aromatic hydrocarbon molecule. These contacts shorten during the transition from the ground state to the excited state. Polymeric compositions based on polystyrene (PS) and poly(methyl methacrylate) (PMMA) doped with 1 and 2 were obtained. The luminescence intensity of dyes 1 and 2 increases during the transition from PMMA to PS. A significant bathochromic shift of the luminescence maximum of 1 is observed, which is associated with the formation of exciplexes and triplexes. The obtained polymeric materials are promising for the development of optical smart materials.
Fedorenko E.V., Mirochnik A.G., Beloliptsev A.Y.
2023-10-05 citations by CoLab: 0 Abstract
The luminescent properties of p- and m-nitrodibenzoylmethanates of boron difluoride are studied by via quantum-chemical modeling in combination with stationary and time-resolved luminescence spectroscopy. The effect the position of the nitro group has on the luminescent properties of the complexes has been revealed. In the series of donor substituents (phenyl, naphthyl, p-methoxyphenyl), compounds with p‑methoxyphenyl have the highest yield of luminescence quanta. The nitro group in the p-position (in contrast to the m-position) greatly reduces the yield of luminescence quanta. The formation of exciplexes is observed in the solutions of complexes in benzene, increasing the yield of luminescence quanta and creating a strong bathochromic shift of the luminescence spectrum’s maximum.
Kim E.E., Il’ina T.M., Kononevich Y.N., Ionov D.S., Khanin D.A., Nikiforova G.G., Muzafarov A.M.
2023-09-30 citations by CoLab: 0 Abstract
Crosslinked polysiloxanes with boron bis(dibenzoylmethanate) complexes used as crosslink junctions of polymer networks are first synthesized, and their physicochemical, mechanical, thermal, and fluorescent properties are studied. It is shown that the polymers under study feature the elastic behavior, possess high thermal and thermo-oxidative stability, and exhibit intense fluorescence in a wide wavelength range (400‒700 nm).
Fedorenko E.V., Lyubykh N.A., Khrebtov A.A., Yu. Beloliptsev A., Mirochnik A.G.
Molecular systems with intense exciplex luminescence are promising for the creation of OLEDs and light-transforming materials. The luminescent properties of difluoroboron meta- and para-nitrodibenzoylmethanates (1 and 2) were studied by the steady-state and time-resolved luminescence spectroscopy methods and quantum chemistry simulation. The influence of the position of the nitro group on the spectral properties of the complexes was revealed. The nitro group withdraws the electron density upon photoexcitation in the para-isomer in contrast to the meta-isomer. The bond order of the CC bond between the phenyl and chelate rings decreases in the excited relaxed state of 2, which leads to rotation of the substituent and a low quantum yield. Formation of exciplexes of 1 and 2 in benzene, toluene and polystyrene was found. The formation of the ground and excited-state electron donor-acceptor complexes based on difluoroboron nitrodibenzoylmethanates and benzene was revealed. The TDDFT method showed that the complexes are characterized by the presence of short contacts between the fluorine atom of the dye molecule and the hydrogen atoms of the aromatic hydrocarbon molecule. These contacts shorten during the transition from the ground state to the excited state. Polymeric compositions based on polystyrene (PS) and poly(methyl methacrylate) (PMMA) doped with 1 and 2 were obtained. The luminescence intensity of dyes 1 and 2 increases during the transition from PMMA to PS. A significant bathochromic shift of the luminescence maximum of 1 is observed, which is associated with the formation of exciplexes and triplexes. The obtained polymeric materials are promising for the development of optical smart materials.
Belova A.S., Kononevich Y.N., Ionov D.S., Sazhnikov V.A., Volodin A.D., Korlyukov A.A., Dorovatovskii P.V., Alfimov M.V., Muzafarov A.M.
2022-12-01 citations by CoLab: 6 Abstract
A series of new dibenzoylmethanatoboron difluoride (DBMBF 2 ) and methoxy-substituted DBMBF 2 dyads linked via flexible diphenylsiloxane linkers of various length have been synthesized and characterized. The structure and optical properties of these compounds were studied by X-ray single-crystal measurements, electron absorption, and steady-state and time-resolved fluorescence spectroscopy. In the dyads under study, which are in an equilibrium between the open and folded conformations, the formation of intramolecular H-dimers in the ground state are observed. For the dyads in dilute solutions in various solvents, both monomer and excimer (through intramolecular excimer formation) emissions are observed at room temperature. The effect of solvent polarity and linker length on the formation of intramolecular excimers has been studied. The contribution of excimers into the total fluorescence spectrum decreases with increasing the solvent polarity, and the length of the siloxane linker. The studied dyads in hexane and cyclohexane solutions have CIE chromaticity coordinates very close to the white color point. The mechanofluorochromic properties of the synthesized dyads were studied. • A series of new dibenzoylmethanatoboron difluoride dyads were synthesized. • The structure and optical properties of the dyads were studied. • The formation of intramolecular H-dimers in the ground state are observed. • For the dyads in dilute solutions both monomer and excimer emissions are observed. • The dyads have CIE chromaticity coordinates very close to the white color point.
Shen Z., Gao Y., Li M., Zhang Y., Xu K., Gong S., Wang Z., Wang S.
Hydrogen sulfide{Wang, 2018 #4}{Wang, 2018 #4}{Zhong, 2020 #9} (H2S) is a poisonous and harmful gas molecule. Certain concentrations of H2S{Liu, 2021 #8} can irritate the eyes, respiratory system, and central nervous system of human beings. Therefore, it was an urgent need for highly selective, anti-interference, and sensitive detection technology for hydrogen sulfide. Herein, a novel "turn-on" fluorescent probe 1-(2-(6,6-dimethylbicyclo[3.1.1]heptyl-2-ene-2-yl))-9-(4-(dimethylaminophenyl))non-1,6,8-triene-3,5-dione boron difluoride complex (MCBF) was designed and synthesized for detecting H2S sensitively. MCBF displayed a remarkable fluorescence enhancement response to H2S with a large Stokes shift of 220 nm. The sensitive detection of MCBF towards H2S owned good selectivity, fast response time (6 min), excellent photostability, and low detection limit (0.44 μM). The sensing mechanism of MCBF towards H2S was well confirmed by HRMS analysis, 1H NMR titration, and density functional theory (DFT) calculations. What's more, probe MCBF was successfully applied to detect the contained H2S in red wine, which showed the potential practicability of MCBF in real samples analysis.
Khrebtov A.A., Fedorenko E.V., Mirochnik A.G.
Polymer Q1 Q2
2022-09-01 citations by CoLab: 8 Abstract
Great potential has been discovered in the development of materials with a long afterglow (phosphorescence at room temperature and delayed fluorescence) for the purposes of luminescent sensing, bioimaging, information encryption and OLED. Here, we report the long-lived (lifetime up to 1.5 s) laser-induced room-temperature excimer delayed fluorescence (RTEDF) of difluoroboron β-diketonate complexes (BF 2 bdks) already at concentrations of 0.05% in solution cast polymer films. The emission centers of RTEDF of BF 2 bdks can retain for a long time in the polycarbonate matrix (>3 months) and can be repeatedly re-excited with a low-intensity ultraviolet light source. These results provide a foundation for the design of materials with applications in optical information storage and data encryption and decryption. • Difluoroboron β-diketonates form excimers in polymer films under laser irradiation. • Bright room-temperature excimer delayed fluorescence in polymers was revealed. • Lifetime of excimer delayed fluorescence is up to 1.5 s. • Excimer delayed fluorescence can retain for a long time (>3 months). • This phenomenon can be used for optical information storage and data encryption.
Thazhathethil S., Muramatsu T., Tamaoki N., Weder C., Sagara Y.
2022-08-31 citations by CoLab: 37 Abstract
Mechanochromic mechanophores are reporter molecules that indicate mechanical events through changes of their photophysical properties. Supramolecular mechanophores, in which the activation is based on the rearrangement of luminophores and/or quenchers without any covalent bond scission, remain less well investigated. Here, we report a cyclophane-based supramolecular mechanophore that contains a 1,6-bis(phenylethynyl)pyrene luminophore and a pyromellitic diimide quencher. In solution, the blue monomer emission of the luminophore is largely quenched and a faint reddish-orange emission originating from a charge-transfer (CT) complex is observed. A polyurethane elastomer containing the mechanophore displays orange emission in the absence of force, which is dominated by the CT-emission. Mechanical deformation causes a decrease of the CT-emission and an increase of blue monomer emission, due to the spatial separation between the luminophore and quencher. The ratio of the two emission intensities correlates with the applied stress.
Wang X., Dong M., Li Z., Wang Z., Liang F.
2022-08-01 citations by CoLab: 19 Abstract
Recently, the research of organic room-temperature phosphorescent materials (ORTP) and organic long persistent luminescence (OLPL) has become a hot topic in the fields of chemistry and material science. To date, there are many reports on the realization of high-efficiency ORTP and OLPL by doping system of organic small molecules, which have attracted widespread attention due to their unique luminescence performance. However, given the lack of clear molecular design principles and comprehension in elucidating the complex doping mechanisms, the development of ORTP and OLPL by doping system is strongly limited, as well as further practical application. A variety of activation strategies including rigidification, energy transfer, charge transfer (CT) intermediated state and cluster have been developed in the reported doping system. Moreover, OLPL materials were also developed with impressive luminescent lifetime. This mini-review summarizes the recent research progress of ORTP and OLPL by doping system of organic small molecules. The reported doping systems of the organic molecules are mainly categoried according to the different luminescent mechanisms, combined with the discussion on the relationship between molecular structure and luminescent performance. This would be helpful to understand luminescent characteristics deeply and further develop efficient ORTP and OLPL doping systems. Last but not the least, this review presents the current challenges and prospects of future development in this field. • High-efficiency ORTP and OLPL by doping system of organic small molecules have been presented. • The reported doping systems are mainly categoried according to the different luminescent mechanisms. • This Mini-Review would be helpful to understand luminescent characteristics deeply and further develop efficient ORTP and OLPL doping systems.
Khrebtov A.A., Fedorenko E.V., Reutov V.A., Mirochnik A.G., Lim L.A.
2022-08-01 citations by CoLab: 5 Abstract
The spectral properties of difluoroboron β‑diketonates in a polystyrene matrix have been studied. A bathochromic shift of the fluorescence bands of dyes in the steady-state luminescence spectra during the transition from solutions to polymer films was revealed, which is associated with the self-absorption of dyes. It is shown that the use of a mask for excitation of a small section of the film is a simple and convenient method for preventing the effect of dye self-absorption in the film on the structure of the fluorescence spectrum.
Kovalenko A., Tcelykh L.O., Koshelev D., Vashchenko A.A., Tsymbarenko D.M., Goloveshkin A.S., Aleksandrov A., Burlov A., Utochnikova V.V.
2022-02-07 citations by CoLab: 8 Abstract
New ytterbium complexes K(Solv)x[Yb(Ln)2] (Solv = ethanol and/or water) with 2-tosylaminobenzylidene-aryloylhydrazones (H2L1, aryloyl = benzoyl; H2L2, aryloyl = 2-naphthoyl) demonstrated high solubility and hole mobility (ca. 2.6 × 10-6 cm2 V-1 s-1), while their electron mobility and PLQY were different. The substitution of a benzoyl substituent with naphthoyl resulted in a significant increase of the electron mobility (6.9 × 10-7vs. 1.7 × 10-6 cm2 V-1 s-1) and a decrease of the quantum yield (1.2% vs. 0.6%). As a result, the optimized OLEDs based on the K[Yb(Ln)2] layer demonstrated efficiencies up to 385 μW W-1 and 441 μW W-1, indicating the superior importance of charge mobility over the quantum yield. These are the highest efficiencies of the Yb electroluminescence.
Khrebtov A.A., Fedorenko E.V., Beloliptsev A.Y., Mirochnik A.G.
The spectral properties and solvatochromic behavior of boron difluoride ortho-hydroxydibenzoylmethanates in polymer matrices with different polarity (polystyrene, polyvinyl chloride, polycarbonate, poly(methyl methacrylate)) were investigated. The specific interaction of polystyrene, polycarbonate and poly(methyl methacrylate) with the investigated fluorophores was revealed. It was shown that the dyes are capable to form exciplexes with phenyl rings of polystyrene. The spectral properties of polystyrene films doped with boron difluoride ortho-hydroxydibenzoylmethanates, which were obtained by the pouring method, significantly depend on the solvent from which they were formed. This makes it possible to control the luminescence color of the films at the manufacturing stage.
Guo J., Zhen Y., Dong H., Hu W.
2021-11-01 citations by CoLab: 47 Abstract
In this review, beside the formation mechanism and emission process of exciplexes, we mainly discuss the donor–acceptor contacting modes and luminescence properties, which are important to develop high-performance and multifunctional optoelectronics.
Jin J., Xue P., Zhang L., Jiang H., Wang W., Yang Q., Tao Y., Zheng C., Chen R., Huang W.
2021-10-13 citations by CoLab: 60 Abstract
Achieving single-component white organic afterglow remains a great challenge owing to the difficulties in simultaneously supporting long-lived emissions from varied excited states of a molecule for complementary afterglow. Here, an extraordinary tri-mode emission from the radiative decays of singlet (S1 ), triplet (T1 ), and stabilized triplet (T1* ) excited states was proposed to afford white afterglow through modulating the singlet-triplet splitting energy (ΔEST ) and exciton trapping depth (ETD ). Low-lying T1 * for yellow afterglow was constructed by H-aggregation engineering with large ETD and trace isomer doping, while high-lying T1 and S1 for blue afterglow with thermally activated emission feature were realized by reducing ΔEST through donor-acceptor molecular design. Therefore, the single-component white afterglow with high efficiency of 14.1 % and a lifetime of 0.61 s was achieved by rationally regulating the afterglow intensity ratios of complementary emissions from S1 , T1 , and T1 *.
Săcărescu L., Cojocaru C., Roman G., Săcărescu G., Simionescu M., Samoilă P., Chibac-Scutaru A.L.
Polymer Q1 Q2
2021-10-01 citations by CoLab: 7 Abstract
Aggregation of various fluorophores is a useful approach to build highly sensitive and selective fluorescent sensors. In this work, the ability of oligomeric polydiphenylsilanes to associate with fluorescent low molecular weight organic compound is illustrated by the formation of stable aggregates between poly[diphenyl-co-methyl(H)]silane and dibenzoylmethanatoboron difluoride in solution. The formation of these nano-structures in solution was investigated both experimentally using gel permeation chromatography, σ spectroscopy and fluorescence spectroscopy, and theoretically by molecular modeling. Thin films obtained from this solution have a characteristic morphology in which the nano-aggregates undergo a self-organizing process and form crystalline spherulites. Association between the fluorescent polysilane and the fluorescent diketonato boron complex proceeds with an increase of fluorescence (amplification efficiency up to 90%) through a FRET mechanism as a result of aggregation, a phenomenon that could be used in the development of fluorescent sensors. • Poly[diphenyl-co-methyl( H )]silane and dibenzoylmethanatoboron difluoride form nano-aggregates in solution; • These nano-aggregates self-organize in solid phase to generate crystalline spherulites; • Association between polysilane and diketonato boron complex produces a material with enhanced fluorescence; • Fluorescence of the system increases as a result of FRET.
Zhang J., Chen Q., Fan Y., Qiu H., Ni Z., Li Y., Yin S.
2021-09-01 citations by CoLab: 16 Abstract
Near-infrared (NIR) fluorophores have promoted the development of materials for bioimaging and therapy, but traditional NIR dyes usually suffer from aggregation-caused quenching (ACQ), impeding their applications. Herein, we propose a difluoroboron β-diketonate complex TTBE , consisting a donor-acceptor (D-A) structure with difluoroboron moiety as an electron acceptor and N , N -diethylaniline as well as triphenylamine (TPA)-thiophene building block as two electron donors . TTBE exhibited both solvatochromism and aggregation-induced emission (AIE) characteristics. In polar solvent DMSO, the emission maxima of TTBE were observed at 680 nm with low fluorescence quantum yield (Φ F = 0.01%), while in less polar solvent CH 2 Cl 2 , its emission maxima blue-shifted to 666 nm with increased fluorescence quantum yield (Φ F = 0.41%). The fluorescence of TTBE could be enhanced 650-fold in 90% hexane/THF mixture solution relatively to that in pure THF. Moreover, the fabricated F127/ TTBE nanoparticles (NPs) showed NIR emission at 735 nm in water and excellent cytocompatibility even at high concentration (100 μg/mL). According to the results of cell imaging and flow cytometry, NPs were easily internalized into cells and distributed in the cytoplasm with strong red fluorescence. Therefore, this research inspires more insight into development of NIR AIE luminogens for biomedical imaging. Chemical structures of the NIR AIEgen (TTBE) and schematic illustration of this AIEgen for cellular imaging. • A near infrared emitting difluoroboron β-diketonate dye with AIE characteristics was synthesized. • Nanoparticles including NIR AIEgen were prepared through nanoprecipitation and emitted at 735 nm with 0.57% of fluorescence quantum yield. • The nanoparticles displayed excellent cytocompatibility, and successfully applied to cellular imaging.
Gao H., Ma X.
Aggregate Q1 Q1 Open Access
2021-08-31 citations by CoLab: 7 PDF Abstract
Pure organic room temperature phosphorescence (RTP) polymers are developing rapidly and receiving widespread attention. The organic polymer hosts with their intertwined rigid network structure, just like the spider web, strongly suppress the molecular vibration of the phosphors and hinder the non-radiative transition of triplet excitons, thereby enhancing emission. (Aggregate. 2021;2:e38)
Li J., Wang X., Pan Y., Sun Y., Wang G., Zhang K.
2021-08-12 citations by CoLab: 43 Abstract
We report an unexpected long room-temperature phosphorescence lifetime of up to 1.0 s by doping iodinated difluoroboron(iii) β-diketonate (IBF2) into phenyl benzoate matrices. In contrast, IBF2 powders alone show insignificant afterglow even at 77 K.
Total publications
10
Total citations
53
Citations per publication
5.3
Average publications per year
1.25
Average coauthors
3.7
Publications years
2017-2024 (8 years)
h-index
5
i10-index
1
m-index
0.63
o-index
7
g-index
7
w-index
1
Metrics description

Top-100

Fields of science

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5
Atomic and Molecular Physics, and Optics, 5, 50%
Electronic, Optical and Magnetic Materials, 2, 20%
Spectroscopy, 2, 20%
Analytical Chemistry, 2, 20%
Instrumentation, 2, 20%
Materials Chemistry, 1, 10%
General Chemistry, 1, 10%
Organic Chemistry, 1, 10%
Biochemistry, 1, 10%
Physical and Theoretical Chemistry, 1, 10%
General Medicine, 1, 10%
Biophysics, 1, 10%
General Chemical Engineering, 1, 10%
Process Chemistry and Technology, 1, 10%
Condensed Matter Physics, 1, 10%
Polymers and Plastics, 1, 10%
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Organizations from articles

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Countries from articles

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Russia, 10, 100%
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Citing organizations

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Organization not defined, 10, 18.87%
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Citing countries

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Russia, 12, 22.64%
Country not defined, 7, 13.21%
China, 2, 3.77%
Colombia, 1, 1.89%
Romania, 1, 1.89%
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  • We do not take into account publications without a DOI.
  • Statistics recalculated daily.
Александр Андреевич Хребтов, Елена Валерьевна Федоренко, Любовь Андреевна Лим, Анатолий Григорьевич Мирочник
RU2747603C2, 2021
Александр Андреевич Хребтов, Елена Валерьевна Федоренко, Анатолий Григорьевич Мирочник
RU2790680, 2023
Company/Organization
Position
Senior Lecturer
Employment type
Full time
Years
2022 — present
Company/Organization
Position
Junior Researcher
Employment type
Part time
Years
2020 — present
Company/Organization
Position
Lecturer
Employment type
Part time
Years
2019 — 2022