Articoli di riviste: "Particule phosphorescente"

1

Laskowska, Magdalena, Anna Nowak, Mateusz Dulski, Peter Weigl, Thomas Blochowicz e Łukasz Laskowski. "Spherical Silica Functionalized by 2-Naphthalene Methanol Luminophores as a Phosphorescence Sensor". International Journal of Molecular Sciences 22, n. 24 (10 dicembre 2021): 13289. http://dx.doi.org/10.3390/ijms222413289.

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Photoluminescence is known to have huge potential for applications in studying biological systems. In that respect, phosphorescent dye molecules open the possibility to study the local slow solvent dynamics close to hard and soft surfaces and interfaces using the triplet state (TSD: triplet state solvation dynamics). However, for that purpose, probe molecules with efficient phosphorescence features are required with a fixed location on the surface. In this article, a potential TSD probe is presented in the form of a nanocomposite: we synthesize spherical silica particles with 2-naphthalene methanol molecules attached to the surface with a predefined surface density. The synthesis procedure is described in detail, and the obtained materials are characterized employing transmission electron microscopy imaging, Raman, and X-ray photoelectron spectroscopy. Finally, TSD experiments are carried out in order to confirm the phosphorescence properties of the obtained materials and the route to develop phosphorescent sensors at silica surfaces based on the presented results is discussed.

2

Malpicci, Daniele, Daniele Maver, Elisabetta Rosadoni, Alessia Colombo, Elena Lucenti, Daniele Marinotto, Chiara Botta, Fabio Bellina, Elena Cariati e Alessandra Forni. "3-Ethynyltriimidazo[1,2-a:1′,2′-c:1″,2″-e][1,3,5]triazine Dual Short- and Long-Lived Emissions with Crystallization-Enhanced Feature: Role of Hydrogen Bonds and π-π Interactions". Molecules 29, n. 9 (25 aprile 2024): 1967. http://dx.doi.org/10.3390/molecules29091967.

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Organic room temperature phosphorescent (ORTP) materials with stimuli-responsive, multicomponent emissive behaviour are extremely desirable for various applications. The derivative of cyclic triimidazole (TT) functionalized with an ethynyl group, TT-CCH, is isolated and investigated. The compound possesses crystallization-enhanced emission (CEE) comprising dual fluorescence and dual phosphorescence of both molecular and supramolecular origin with aggregation-induced components highly sensitive to grinding. The mechanisms involved in the emissions have been disclosed thanks to combined structural, spectroscopic and computational investigations. In particular, strong CH⋯N hydrogen bonds are deemed responsible, for the first time in the TT family, together with frequently observed π⋯π stacking interactions, for the aggregated fluorescence and phosphorescence.

3

Liu, Zhenping, Xianfeng Wang, Jingzhou Hou, Danqun Huo e Changjun Hou. "A Simple and Rapid Phosphorescence Probe Based on Mn-Doped ZnS Quantum Dots for Chloramphenicol Detection". Nano 14, n. 11 (novembre 2019): 1950144. http://dx.doi.org/10.1142/s1793292019501443.

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An innovative phosphorescence probe based on Mn-doped ZnS quantum dots (Mn:ZnS QDs) was developed for selective detection of chloramphenicol (CAP) via inner-filter effect (IFE). Mn:ZnS QDs were synthesized by water method and modified with L-Cysteine for better stability, and the average diameter of the nanometer particle was 3.8[Formula: see text]nm. With the excitation wavelength at 289[Formula: see text]nm, the strong phosphorescence of Mn:ZnS QDs can be emitted at 583[Formula: see text]nm. The excitation spectrum of Mn:ZnS QDs was substantially overlapped with the absorption spectrum of the target CAP. The excited light of Mn:ZnS QDs can be absorbed partially by CAP when they coexist, the phosphorescence intensity decreased with the increasing concentration of CAP, and it has a good linear relationship. Under optimal conditions, the linear relational concentration range achieved four orders of magnitude from 25 to [Formula: see text] ([Formula: see text]), with a detection limit (LOD; [Formula: see text]) down to 0.81[Formula: see text][Formula: see text]. The simple, rapid and low cost IFE phosphorescent probe exhibited satisfactory recoveries ranging from 88.9% to 98.5% for CAP analysis in spiked honey, which shows a potential for routine screening of CAP in ensuring the food safety.

4

Kemp, L., Elizabeth C. Jamieson e S. J. Gaskin. "Phosphorescent tracer particles for Lagrangian flow measurement and particle tracking velocimetry". Experiments in Fluids 48, n. 5 (20 gennaio 2010): 927–31. http://dx.doi.org/10.1007/s00348-009-0818-z.

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Diel, Waldemar, Dustin Büttner, Klaus Krüger e Beat Zobrist. "Digital Printing of Phosphorescent Particles". NIP & Digital Fabrication Conference 27, n. 1 (1 gennaio 2011): 466–69. http://dx.doi.org/10.2352/issn.2169-4451.2011.27.1.art00013_2.

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6

Winnik, Mitchell A., Onder Pekcan e M. D. Croucher. "Phosphorescence of naphthalene-labelled colloidal polymer particles. The α-methyl relaxation of one microphase in a multicomponent material". Canadian Journal of Chemistry 63, n. 1 (1 gennaio 1985): 129–33. http://dx.doi.org/10.1139/v85-021.

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Nonaqueous dispersions of poly(methyl methacrylate) (PMMA) particles, sterically stabilized with polyisobutylene (PIB), were prepared with naphthalene (N) groups covalently incorporated into the PMMA chains. These materials have a complex morphology of phase-separated PMMA and PIB microdomains, with the N groups in the PMMA microphases. The phosphorescence intensity and decay times of the N groups were measured as a function of temperature over the range 77–295 K for dispersions in methylcyclohexane and for freeze-dried powder samples. An Arrhenius treatment of the radiationlcss decay rate showed a change in slope at −35 °C. The activation energy for the radiationless decay process is 3.8 kcal/mol in the −35 – +22 °C temperature region, identical to that found for pure PMMA by nmr for chain motion associated with the a-methyl relaxation process. We believe that the phosphorescence experiment is sensitive to the diffusion of oxygen and other impurities in the sample. These rates increase as the temperature is raised, enhancing the rate of phosphorescence quenching. These experiments indicate that phosphorescence measurements on labelled samples are suitable for studying relaxation processes within individual microphases of a polyphasic composite material.

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KATOH, Akira, Tomomi HATANAKA, Eri TAKEUCHI, Masaki UCHIDA e Hideshi NATSUME. "Calibration of infrared video-oculography by using bioadhesive phosphorescent particles for accurate measurement of vestibulo-ocular reflex in mice". Journal of Advanced Science 27, n. 3+4 (2015): 11–16. http://dx.doi.org/10.2978/jsas.27.11.

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Rojas-Hernandez, R. E., F. Rubio-Marcos, E. Enríquez, M. A. De La Rubia e J. F. Fernandez. "A low-energy milling approach to reduce particle size maintains the luminescence of strontium aluminates". RSC Advances 5, n. 53 (2015): 42559–67. http://dx.doi.org/10.1039/c5ra04878h.

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9

Purdy, Barbara B., e Robert J. Hurtubise. "Changes in the Photophysical Properties with Heavy Atoms and the Effects of Modulus for 4-Phenylphenol in Solid-Matrix Luminescence". Applied Spectroscopy 46, n. 6 (giugno 1992): 988–93. http://dx.doi.org/10.1366/0003702924124367.

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Fluorescence and phosphorescence quantum yields and fluorescence and phosphorescence lifetimes were obtained for 4-phenylphenol adsorbed on filter paper with either NaCl, NaBr, or Nal at 296 and 93 K. From these data several photophysical parameters were calculated and compared. In general, the photophysical data showed that the heavy-atom effect was operative, with NaI showing the greatest effect. However, NaBr at 93 K showed both the heavy-atom effect and another effect which was particular to NaBr. For 4-phenylphenol with NaI, very little increase occurred for the phosphorescence quantum yield from 296 to 93 K, which indicated that almost maximum phosphorescence quantum yield was achieved at room temperature for 4-phenylphenol with NaI present. The increase in phosphorescence lifetime for 4-phenylphenol from room temperature to low temperature was shown to be related to the increase in the Young's modulus of filter paper as the temperature was lowered. Calculated phosphorescence lifetimes at room temperature and at low temperature with equations that included Young's modulus values agreed very well with experimental lifetime values.

10

Mahltig, Boris, Clara Heil, Sarah Kaub e Jaydip Nareshbhai Kapadiya. "The use of phosphorescence micromaterials for commercial textile products". Communications in Development and Assembling of Textile Products 5, n. 1 (1 gennaio 2024): 1–10. http://dx.doi.org/10.25367/cdatp.2024.5.p1-10.

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Fluorescent textile products are manifold used. Compared to fluorescent textiles, phosphorescent textile products exhibit an afterglow effect even after the illumination is stopped. Phosphorescent textiles are less present as commercial products on the market. With this background the aim of the actual presentation is to investigate the properties of commercially available phosphorescent textile materials. Investigations are performed by illumination under different light arrangement. Microscopy is performed by scanning electronic microscopy (SEM) and advanced light microscopy using UV light. Light emission of the samples is recorded by fluorescence spectroscopy. The chemical composition is determined by using electron dispersive spectroscopy (EDS). Depending on the type of sample, an afterglow effect can be determined up to 5 to 30 minutes after stopping the illumination with UV light. By SEM and EDS methods it is observed that the phosphorescent effects are realized by application of phosphorescent pigments, which can be best described as phosphorescent micromaterials. Depending on the product category, two different types of phosphorescent materials are used – doped strontium aluminates (SrAl2O4) and zinc sulfide (ZnS). Products based on doped strontium aluminates exhibit longer afterglow effects compared to products with ZnS pigments. However, the use of doped strontium aluminate is quite surprising for a commercial textile product, because of cost reasons. Finally, it can be stated that phosphorescent micromaterials are established materials for realization of functional textile products. These micromaterials can be found in every day products and are examples for innovative particle technology used in commercial consumer products.

11

Choi, Geun Su, Byunghyun Kang, Jinnil Choi, Byeong-Kwon Ju e Young Wook Park. "Reduced Efficiency Roll-Off in Phosphorescent Organic Light-Emitting Diodes with a Double Dopant". Journal of Nanoscience and Nanotechnology 20, n. 11 (1 novembre 2020): 6679–82. http://dx.doi.org/10.1166/jnn.2020.18770.

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The phenomenon by which the efficiency decreases rapidly with the increase in luminance or current density in organic light-emitting diodes is termed efficiency roll-off. In particular, phosphorescent organic light-emitting diodes are known to have higher efficiency, but tend to exhibit higher efficiency roll-off compared with fluorescent organic light-emitting diodes. In this study, we report the efficiency roll-off characteristics of double-dopant phosphorescent organic light-emitting diodes. The double-dopant phosphorescent organic light-emitting diodes showed significantly lower efficiency roll-off compared with single-dopant phosphorescent organic light-emitting diodes. (The double-dopant device showed a 2.5-fold decrease in efficiency roll-off compared with the single-dopant device at 50 mA/cm2, and a 1.6-fold decrease in efficiency roll-off at 100 mA/cm2).

12

Sperling, R. A., e W. J. Parak. "Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, n. 1915 (28 marzo 2010): 1333–83. http://dx.doi.org/10.1098/rsta.2009.0273.

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Inorganic colloidal nanoparticles are very small, nanoscale objects with inorganic cores that are dispersed in a solvent. Depending on the material they consist of, nanoparticles can possess a number of different properties such as high electron density and strong optical absorption (e.g. metal particles, in particular Au), photoluminescence in the form of fluorescence (semiconductor quantum dots, e.g. CdSe or CdTe) or phosphorescence (doped oxide materials, e.g. Y 2 O 3 ), or magnetic moment (e.g. iron oxide or cobalt nanoparticles). Prerequisite for every possible application is the proper surface functionalization of such nanoparticles, which determines their interaction with the environment. These interactions ultimately affect the colloidal stability of the particles, and may yield to a controlled assembly or to the delivery of nanoparticles to a target, e.g. by appropriate functional molecules on the particle surface. This work aims to review different strategies of surface modification and functionalization of inorganic colloidal nanoparticles with a special focus on the material systems gold and semiconductor nanoparticles, such as CdSe/ZnS. However, the discussed strategies are often of general nature and apply in the same way to nanoparticles of other materials.

13

Yashchuk, V. M., I. V. Lebedyeva e O. M. Navozenko. "Manifestations of triplet electronic excitations migration in π-electron containing polymers". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, n. 1 (2019): 242–45. http://dx.doi.org/10.17721/1812-5409.2019/1.55.

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The results of spectral studies of polymers with aromatic side groups are considered and analyzed. In particular, the phosphorescence spectra of polyvinylcarbazole (PVCa) polyvinyl-7-benzocarbazole (PV7BK) polypropylcarbazole (PEPC) are presented and analyzed. The phosphorescence of these polymers has been shown to be related to the migration of triplet excitons in macromolecules. The phosphorescence of PVC is determined at 77by deep traps (oxides), at 4.2 -shallow traps (monomer units of PVCa). The spreading length of triplet excitons in PVCa macromolecules is 600 A – that corresponds to the average distances between adjacent traps in the macromolecule. There are no such traps in PV7BK macromolecules. The boundary conditions for triplet excitons in macromolecules of PV7BCa were used for evaluation the excitons spreading length. With this aim the dependence of phosphorescence spectra on molecular weihgt were studied The effect of changing of spectral positions of phosphorescence bands when exciton rich the end macromolecular cell was used. The average trip length of triplet excitons is approximately 1000 A. This distance is in fact limited by the probability of the meeting of triplet excitons in the macromolecule and their annihilation at a given excitation intensity.

14

Bradley, Melanie, Muthupandian Ashokkumar e Franz Grieser. "Sonochemical Production of Fluorescent and Phosphorescent Latex Particles". Journal of the American Chemical Society 125, n. 2 (gennaio 2003): 525–29. http://dx.doi.org/10.1021/ja0268581.

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Mao, Meng-Xi, Fang-Ling Li, Yan Shen, Qi-Ming Liu, Shuai Xing, Xu-Feng Luo, Zhen-Long Tu, Xue-Jun Wu e You-Xuan Zheng. "Simple Synthesis of Red Iridium(III) Complexes with Sulfur-Contained Four-Membered Ancillary Ligands for OLEDs". Molecules 26, n. 9 (29 aprile 2021): 2599. http://dx.doi.org/10.3390/molecules26092599.

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Phosphorescent iridium(III) complexes have been widely researched for the fabrication of efficient organic light-emitting diodes (OLEDs). In this work, three red Ir(III) complexes named Ir-1, Ir-2, and Ir-3, with Ir-S-C-S four-membered framework rings, were synthesized efficiently at room temperature within 5 min using sulfur-containing ancillary ligands with electron-donating groups of 9,10-dihydro-9,9-dimethylacridine, phenoxazine, and phenothiazine, respectively. Due to the same main ligand of 4-(4-(trifluoromethyl)phenyl)quinazoline, all Ir(III) complexes showed similar photoluminescence emissions at 622, 619, and 622 nm with phosphorescence quantum yields of 35.4%, 50.4%, and 52.8%, respectively. OLEDs employing these complexes as emitters with the structure of ITO (indium tin oxide)/HAT-CN (dipyra-zino[2,3-f,2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile, 5 nm)/TAPC (4,4′-cyclohexylidenebis[N,N-bis-(4-methylphenyl)aniline], 40 nm)/TCTA (4,4″,4″-tris(carbazol-9-yl)triphenylamine, 10 nm)/Ir(III) complex (10 wt%): 2,6DCzPPy (2,6-bis-(3-(carbazol-9-yl)phenyl)pyridine, 10 nm)/TmPyPB (1,3,5-tri(mpyrid-3-yl-phenyl)benzene, 50 nm)/LiF (1 nm)/Al (100 nm) achieved good performance. In particular, the device based on complex Ir-3 with the phenothiazine unit showed the best performance with a maximum brightness of 22,480 cd m−2, a maximum current efficiency of 23.71 cd A−1, and a maximum external quantum efficiency of 18.1%. The research results suggest the Ir(III) complexes with a four-membered ring Ir-S-C-S backbone provide ideas for the rapid preparation of Ir(III) complexes for OLEDs.

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Wang, Huiyong, Hongmei Yu, Ayman AL-Zubi, Xiuhui Zhu, Guochao Nie, Shaoyan Wang e Wei Chen. "Self-Matrix N-Doped Room Temperature Phosphorescent Carbon Dots Triggered by Visible and Ultraviolet Light Dual Modes". Nanomaterials 12, n. 13 (28 giugno 2022): 2210. http://dx.doi.org/10.3390/nano12132210.

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The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications. In particular, RTP-CDs with dual modes of excitation are more interesting. Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation. Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs. Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure. Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure. The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds. These hydrogen bonds can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state. This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs. Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively. The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms. In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.

17

Louge, Michel Y., Subramanyam A. Iyer, Emmanuel P. Giannelis, D. Jeffrey Lischer e Hongder Chang. "Optical fiber measurements of particle velocity using laser-induced phosphorescence". Applied Optics 30, n. 15 (20 maggio 1991): 1976. http://dx.doi.org/10.1364/ao.30.001976.

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Breunig, Hans Georg, e Karsten König. "High-Resolution Phosphorescence Lifetime Imaging (PLIM) of Bones". Applied Sciences 12, n. 3 (20 gennaio 2022): 1066. http://dx.doi.org/10.3390/app12031066.

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For the first time, the time-resolved two-photon excited autophosphorescence of non-labeled biological specimens was investigated by phosphoresce lifetime imaging with microscopic spatial resolution. A modified multiphoton tomograph was employed to record both photoluminescence contributions, autofluorescence and autophosphorescence, simultaneously, induced by two-photon excitation using an 80 MHz near infrared femtosecond-pulse-laser scanning beam, an acousto-optic modulator, and a time-correlated single-photon counting module for lifetime measurements from the picosecond to the microsecond range. In particular, the two-photon-excited luminescence of thermally altered bones was imaged. A strong dependence of the phosphorescence intensity on exposure temperature, with a maximum emission for an exposure temperature of approximately 600 °C was observed. Furthermore, the phosphorescence lifetime data indicated a bi-exponential signal decay with both a faster few µs decay time in the range of 3–10 µs and a slower one in the range of 30–60 µs. The recording of fluorescence and phosphorescence allowed deriving the relative signal proportion as an unbiased measure of the temperature dependence. The measurements on thermally altered bones are of particular interest for application to forensic and archeological investigations.

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Villa, Marco, Simone D’Agostino, Piera Sabatino, Raymond Noel, José Busto, Myriam Roy, Marc Gingras e Paola Ceroni. "Pentasulfurated benzene-cored asterisks: relationship between crystal structure and luminescence properties". New Journal of Chemistry 44, n. 8 (2020): 3249–54. http://dx.doi.org/10.1039/c9nj05905a.

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Adadurov, A. F., P. N. Zhmurin, V. N. Lebedev e V. V. Kovalenko. "Plastic scintillator with phosphorescent dopants for α-particles registration". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 621, n. 1-3 (settembre 2010): 354–57. http://dx.doi.org/10.1016/j.nima.2010.04.055.

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Kim, Doory. "Recent Developments in Lanthanide-Doped Alkaline Earth Aluminate Phosphors with Enhanced and Long-Persistent Luminescence". Nanomaterials 11, n. 3 (13 marzo 2021): 723. http://dx.doi.org/10.3390/nano11030723.

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Lanthanide-activated alkaline earth aluminate phosphors are excellent luminescent materials that are designed to overcome the limitations of conventional sulfide-based phosphors. The increasing research attention on these phosphors over the past decade has led to a drastic improvement in their phosphorescence efficiencies and resulted in a wide variety of phosphorescence colors, which can facilitate applications in various areas. This review article discusses the development of lanthanide-activated alkaline earth aluminate phosphors with a focus on the various synthesis methods, persistent luminescence mechanisms, activator and coactivator effects, and the effects of compositions. Particular attention has been devoted to alkaline earth aluminate phosphors that are extensively used, such as strontium-, calcium-, and barium-based aluminates. The role of lanthanide ions as activators and coactivators in phosphorescence emissions was also emphasized. Finally, we address recent techniques involving nanomaterial engineering that have also produced lanthanide-activated alkaline earth aluminate phosphors with long-persistent luminescence.

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Chelushkin, Pavel S., Julia R. Shakirova, Ilya S. Kritchenkov, Vadim A. Baigildin e Sergey P. Tunik. "Phosphorescent NIR emitters for biomedicine: applications, advances and challenges". Dalton Transactions 51, n. 4 (2022): 1257–80. http://dx.doi.org/10.1039/d1dt03077a.

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This review describes the current state of the art in the chemistry of phosphorescent NIR emitters with a particular focus on their application in biomedicine as luminescent probes, sensors and theranostic agents.

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Lin, Meijuan, Caiping Luo, Guang Xing, Longjie Chen e Qidan Ling. "Influence of polyhedral oligomeric silsesquioxanes (POSS) on the luminescence properties of non-conjugated copolymers based on iridium complex and carbazole units". RSC Advances 7, n. 63 (2017): 39512–22. http://dx.doi.org/10.1039/c7ra07316j.

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The non-conjugated copolymers with the carrier-transporting carbazole units, phosphorescence iridium complex units and nano-scale particles POSS were synthesized. The effects of POSS on the performance of copolymer hybrid materials were investigated.

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Duan, Xiaoxia, Lixin Yi, Xiqing Zhang e Shihua Huang. "Size-Dependent Optical Properties of Nanoscale and Bulk Long Persistent Phosphor SrAl2O4:Eu2+, Dy3+". Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/298692.

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Nanoscale long persistent phosphor SrAl2O4:Eu2+, Dy3+was prepared by autocombustion of citrate gel. The energy level shift of activator Eu2+and coactivator Dy3+was analyzed according to the emission and the excitation spectra. The band gap change of SrAl2O4and the resulting trap depth change with particle size were discussed on the basis of analyzing the visible spectra, the vacuum ultraviolet (VUV) excitation spectra, and the thermoluminescence (TL) spectra. The fluorescence quenching and the shallow traps originating from surface adsorption or surface defects explain the weak initial persistent phosphorescence and the fast phosphorescence decay in nanometer SrAl2O4:Eu2+, Dy3+. It is confirmed that energy level, band gap, trap depth, defect, and surface adsorption are deeply related with each other in this nanoscale long persistent phosphor.

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Kim, Hyungsoo, Eric S. Daniels, Shang Li, Vijaya K. Mokkapati e Keith Kardos. "Polymer encapsulation of yttrium oxysulfide phosphorescent particles via miniemulsion polymerization". Journal of Polymer Science Part A: Polymer Chemistry 45, n. 6 (2007): 1038–54. http://dx.doi.org/10.1002/pola.21860.

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Shen, Yong, Yunfei Xia, Ping Li, Shuo Zhang, Linlin Li, Die Hu, Dongfang Shi e Kai Song. "Microwave-Assisted Synthesis of Room Temperature Long Persistent Luminescent Materials and Their Imaging Applications". Crystals 13, n. 4 (20 aprile 2023): 705. http://dx.doi.org/10.3390/cryst13040705.

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In this study, we utilized a simple and efficient microwave heating method with polyethyleneimine (PEI) and phosphate as raw materials to synthesize room temperature persistent luminescence (RTPL) materials that emit phosphorescent light for up to 10 s. Our investigation revealed that the optimal synthesis conditions were a microwave radiation power of 560 W and a heating time of 5 min. The synthesized RTPL materials had an average particle size of 2 nm and exhibited excellent RTPL performance, with optimal excitation and emission wavelengths of 360 nm and 544 nm, respectively. Additionally, these materials displayed good water solubility. We conducted mapping experiments and in situ phosphorescent imaging of plants to showcase the potential applications of RTPL materials in the fields of biological imaging and anti-counterfeiting. Overall, our findings demonstrate the promising potential of these RTPL materials as versatile tools for various practical applications.

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Song, Xuedong, Lei Huang e Bin Wu. "Bright and Monodispersed Phosphorescent Particles and Their Applications for Biological Assays". Analytical Chemistry 80, n. 14 (luglio 2008): 5501–7. http://dx.doi.org/10.1021/ac800483n.

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Wei, Wei, Jie Ma, Jonas Schaab, Jason Brooks, Seogshin Kang, Matthew T. Whited, Peter I. Djurovich e Mark E. Thompson. "A Comparison between Triphenylmethyl and Triphenylsilyl Spirobifluorenyl Hosts: Synthesis, Photophysics and Performance in Phosphorescent Organic Light-Emitting Diodes". Molecules 28, n. 13 (6 luglio 2023): 5241. http://dx.doi.org/10.3390/molecules28135241.

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This study presents the synthesis and characterization of two spirobifluorenyl derivatives substituted with either triphenylmethyl (SB-C) or triphenylsilyl (SB-Si) moieties for use as host materials in phosphorescent organic light-emitting diodes (PHOLED). Both molecules have similar high triplet energies and large energy gaps. Blue Ir(tpz)3 and green Ir(ppy)3 phosphorescent devices were fabricated using these materials as hosts. Surprisingly, SB-Si demonstrated superior charge-transporting ability compared to SB-C, despite having similar energies for their valence orbitals. In particular, SB-Si proved to be a highly effective host for both blue and green devices, resulting in maximum efficiencies of 12.6% for the Ir(tpz)3 device and 9.6% for the Ir(ppy)3 device. These results highlight the benefits of appending the triphenylsilyl moiety onto host materials and underscore the importance of considering the morphology of hosts in the design of efficient PHOLEDs.

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Karacaoglu, Erkul, Faruk Ozel, Sabriye Acikgoz, Adem Sarilmaz, Hasan Yungevis, Mert Gul e Ali Kemal Okyay. "Investigation of Atomic Layer Deposition Post-Coating Properties of Phosphorescent SrAl₂O₄: Eu²⁺, Dy³⁺ Fibers Produced By Electrospinning". ECS Meeting Abstracts MA2022-02, n. 51 (9 ottobre 2022): 1974. http://dx.doi.org/10.1149/ma2022-02511974mtgabs.

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In this research, phosphorescent SrAl2O4:Eu2+, Dy3+ fibers were produced by electrospinning and coated with atomic layer deposition (ALD) technique to enhance the photoluminescence (PL) properties, and water & thermal resistance. Particle form of Eu2+-activated strontium aluminate phosphors possess many remarkable features that have been reported over and over, for example, nontoxic, stable, efficient. PL enhancement and stability in water of these particles were provided by nano encapsulation process by ALD that has just been published in our previous paper. In this study, for the first time, SrAl2O4 based long persistence phosphor fibers were coated with the ALD method to both improve their PL and provide water & thermal resistance property. In this successfully carried out study, luminescence, optic, chemical and structural properties of phosphor in fiber form were investigated in detail. These improved submicron afterglow fibers which are SrAl2O4:Eu2+, Dy3+ based are promising materials for applications such as solar cells, luminescent labels for bioimaging, mechanoluminescence sensor, etc.

30

Díaz-García, M. E., B. Noval Gutiérrez e R. Badía. "Tailoring room-temperature phosphorescent ormosil particles for oxygen recognition in organic solvents". Sensors and Actuators B: Chemical 110, n. 1 (settembre 2005): 66–72. http://dx.doi.org/10.1016/j.snb.2005.01.022.

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Taguchi, Yoshinari, Daisuke Ito, Natsukaze Saito, Isao Kimura e Masato Tanaka. "Preparation and characterization of microcapsules containing particulate phosphorescent agent with suspension polymerization". Polymers for Advanced Technologies 28, n. 3 (22 agosto 2016): 379–85. http://dx.doi.org/10.1002/pat.3899.

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Koshida, Nobuyoshi, Toshiyuki Ohta, Yoshiyuki Hirano, Romain Mentek e Bernard Gelloz. "Functional Device Applications of Nanosilicon". Key Engineering Materials 470 (febbraio 2011): 20–26. http://dx.doi.org/10.4028/www.scientific.net/kem.470.20.

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The particular physical functions of quantum-sized silicon have been investigated, along with exploration of their potential device applications. A strong confinement effect fully modifies the original optical, electrical, and thermal properties of bulk silicon. A discussion regarding their control and applications is presented, which addresses blue phosphorescence, enhanced photoconduction, operation of a ballistic electron emitter in solutions, and digital drive of a thermo-acoustic sound emitter.

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Kaya, S. Yesilay, E. Karacaoglu e B. Karasu. "Particle size influence of starting batches on phosphorescence behaviour of Sr4Al14O25based bluish green phosphors". Advances in Applied Ceramics 111, n. 7 (ottobre 2012): 393–97. http://dx.doi.org/10.1179/1743676112y.0000000005.

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Previtali, Andrea, Elena Lucenti, Alessandra Forni, Luca Mauri, Chiara Botta, Clelia Giannini, Daniele Malpicci, Daniele Marinotto, Stefania Righetto e Elena Cariati. "Solid State Room Temperature Dual Phosphorescence from 3-(2-Fluoropyridin-4-yl)triimidazo[1,2-a:1′,2′-c:1″,2″-e][1,3,5]triazine". Molecules 24, n. 14 (13 luglio 2019): 2552. http://dx.doi.org/10.3390/molecules24142552.

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Organic room temperature persistent luminescence is a fascinating but still largely unexplored phenomenon. Cyclic-triimidazole and its halogenated (Br, I) derivatives have recently revealed as intriguing phosphors characterized by multifaceted emissive behavior including room temperature ultralong phosphorescence (RTUP) associated with the presence of H-aggregates in their crystal structure. Here, we move towards a multicomponent system by incorporating a fluoropyridinic fragment on the cyclic-triimidazole scaffold. Such chromophore enhances the molecular properties resulting in a high photoluminescence quantum yield (PL QY) in solution but preserves the solid-state RTUP. By means of X-ray diffraction (XRD) analysis, theoretical calculations, steady-state and time-resolved spectroscopy on solutions, polymethylmethacrylate (PMMA) blends and crystals, the nature of the different radiative deactivation channels of the compound has been disclosed. In particular, the molecular fluorescence and phosphorescence, this latter observed in frozen solution and in PMMA blends, are associated to deactivation from S1 and T1 respectively, while the low energy RTUP, observed only for crystals, is interpreted as originated from H aggregates.

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Kolpaczynska, Milena, Christopher A. DeRosa, William A. Morris e Cassandra L. Fraser. "Thienyl Difluoroboron β-Diketonates in Solution and Polylactide Media". Australian Journal of Chemistry 69, n. 5 (2016): 537. http://dx.doi.org/10.1071/ch15750.

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Difluoroboron β-diketonates (BF2bdks) have impressive optical properties in both solution and the solid state. In particular, both fluorescence and room-temperature phosphorescence are present when the dyes are confined to a rigid matrix, such as poly(lactic acid) (PLA). To expand the current knowledge and colour range capabilities of this unique type of multi-emitting chromophore, a series of thienyl-substituted BF2bdk complexes have been synthesized. The photophysical properties were investigated in dichloromethane solution and in the solid state as dye/PLA blends. By varying donor ability, i.e. methyl, phenyl, methoxy, and thienyl substituents, and by changing the dye loading in the PLA media (0.1–10 % dye loading) red-shifted emission was achieved, which is important for biological imaging applications. In dilute CH2Cl2 solution, complexes exhibited absorptions ranging from 350 to 420 nm, solid-state fluorescence in PLA ranging from 390 to 500 nm, and oxygen sensitive phosphorescence ranging from 540 to 585 nm in PLA blends. Promising candidates as dye/PLA blends serve as models for dye–polymer conjugates for application as biological oxygen nanoprobes.

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Deponte, H., W. Augustin e S. Scholl. "Development of a quantification method for fouling deposits using phosphorescence". Heat and Mass Transfer 57, n. 10 (26 marzo 2021): 1661–70. http://dx.doi.org/10.1007/s00231-021-03053-6.

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AbstractParticulate fouling on structured surfaces is typically quantified using the integral thermal or mass-based fouling resistance. The observed geometries may be structures that can improve the heat transfer in heat exchangers (e.g., dimples), cavities in components, or more complex geometries. However, due to limited accessibility or the requirement for a locally resolved measurement, the existing quantification methods may not be applicable to structured surfaces. For this reason, a new method is needed for the quantification for fouling deposits. In this study, dimpled surfaces were evaluated by measuring the integral thermal and mass-based fouling resistance and comparing it with the local fouling resistance inside and around the dimple. This comparison was carried out online with the Phosphorescent Fouling Quantification method developed for this purpose, using phosphorescent particles to quantify the deposited mass. The mass-based fouling resistance can be calculated using computer-aided image analysis. The measurements for the evaluation were conducted on dimpled surfaces, which produced a characteristic fouling pattern. With the new method a reduced surface coverage from up to 33.3 % was observed, which led to lower fouling resistances downstream of the dimple compared to a plain surface. These results confirm earlier numerical and experimental findings, suggesting an advantage of dimpled surfaces over other surface structures with respect to thermo-hydraulic efficiency as well as reduced fouling. Thus, the Phosphorescent Fouling Quantification method provides the possibility of calculating values for local fouling resistances on structured surfaces, as well as the possibility of optimizing surface structures to minimize fouling propensity.

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Cebrián, Cristina, e Matteo Mauro. "Recent advances in phosphorescent platinum complexes for organic light-emitting diodes". Beilstein Journal of Organic Chemistry 14 (18 giugno 2018): 1459–81. http://dx.doi.org/10.3762/bjoc.14.124.

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Phosphorescent organometallic compounds based on heavy transition metal complexes (TMCs) are an appealing research topic of enormous current interest. Amongst all different fields in which they found valuable application, development of emitting materials based on TMCs have become crucial for electroluminescent devices such as phosphorescent organic light-emitting diodes (PhOLEDs) and light-emitting electrochemical cells (LEECs). This interest is driven by the fact that luminescent TMCs with long-lived excited state lifetimes are able to efficiently harvest both singlet and triplet electro-generated excitons, thus opening the possibility to achieve theoretically 100% internal quantum efficiency in such devices. In the recent past, various classes of compounds have been reported, possessing a beautiful structural variety that allowed to nicely obtain efficient photo- and electroluminescence with high colour purity in the red, green and blue (RGB) portions of the visible spectrum. In addition, achievement of efficient emission beyond such range towards ultraviolet (UV) and near infrared (NIR) regions was also challenged. By employing TMCs as triplet emitters in OLEDs, remarkably high device performances were demonstrated, with square planar platinum(II) complexes bearing π-conjugated chromophoric ligands playing a key role in such respect. In this contribution, the most recent and promising trends in the field of phosphorescent platinum complexes will be reviewed and discussed. In particular, the importance of proper molecular design that underpins the successful achievement of improved photophysical features and enhanced device performances will be highlighted. Special emphasis will be devoted to those recent systems that have been employed as triplet emitters in efficient PhOLEDs.

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Longoni, Margherita, Serena Francone, Maddalena Boscacci, Diego Sali, Isabella Cavaliere, Vittoria Guglielmi e Silvia Bruni. "Special-Effect and Conventional Pigments in Black Light Art: A Multi-Technique Approach to an In-Situ Investigation". Materials 15, n. 19 (26 settembre 2022): 6671. http://dx.doi.org/10.3390/ma15196671.

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Since their introduction in the early decades of the 20th century, fluorescent pigments have found progressively wider applications in several fields. Their chemical composition has been optimized to obtain the best physical properties, but is not usually disclosed by the manufacturers. Even the other class of luminescent pigments, namely the phosphorescent ones, is now produced industrially. The peculiar optical properties of these pigments have attracted more and more the attention of famous artists since the middle of the last century. The Italian Black Light Art movement exploits the possibility of conveying different aesthetical messages depending on the kind of radiation (UV or visible) with which the artwork is illuminated. In the present work, a non-invasive in-situ investigation based on Raman, fluorescence, and visible-reflectance spectroscopies was performed on a series of Black Light Art paintings exhibited in Milan (Italy) in 2017, succeeding in the identification of the materials used by the artists. In particular, the use of both fluorescent and phosphorescent pigments, alone or combined with conventional synthetic organic pigments, has been recognized.

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Bartwal, K. S., B. K. Singh e H. Ryu. "Preparation of CaAl₂O₄: Eu²⁺ Long Persistent Blue Phosphor". Advanced Materials Research 26-28 (ottobre 2007): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.573.

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CaAl2O4:Eu2+ with high brightness and long persistent luminescence were prepared by solid state reaction method. The phosphor compositions with varying Eu2+ were investigated by powder X-ray diffractometer (XRD), SEM, TEM, photoluminescence excitation and emission spectra. Broad band UV excited luminescence of the CaAl2O4:Eu2+ was observed in the blue region (λmax = 440 nm) due to transitions from the 4f65d1 to the 4f7 configuration of the Eu2+ ion. The particle size also plays a role deciding the luminescence characteristics of these phosphors. The decay time of the persistence indicated that the persistent luminescence phosphor has bright phosphorescence and maintains a long duration.

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Leone, G., R. Ragni, D. Vona, S. R. Cicco, F. Babudri e G. M. Farinola. "A phosphorescent iridium complex as a probe for diatom cells’ viability". MRS Advances 5, n. 18-19 (2020): 935–41. http://dx.doi.org/10.1557/adv.2020.18.

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ABSTRACTDiatoms are unicellular photosynthetic algae that autonomously fabricate a porous organized biosilica shell refined in billion years of evolution. They represent an inexhaustible source of low cost, biocompatible mesoporous silica. Despite the major advances in the genomic field, studies on diatom cell biology are still hampered by a lack of cellular tools. In particular, cell staining assays of diatoms viability are still limited or not well performant. Here we provide a phosphorescent organometallic iridium complex (Ir-Fcx) suitable to act as staining agent to detect diatoms viability.

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Dědic, R., A. Svoboda, J. Psŕenĕk, L. Lupínková, J. Komenda e J. Hála. "Time and spectral resolved phosphorescence of singlet oxygen and pigments in photosystem II particles". Journal of Luminescence 102-103 (maggio 2003): 313–17. http://dx.doi.org/10.1016/s0022-2313(02)00524-0.

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Shin, Dae Yong, e Kyung Nam Kim. "Effects of Eu²⁺, Dy³⁺ Contents and Particle Sizes on the Luminescent Properties of SrAl₂O₄ Phosphor by the Sol-Gel Process". Materials Science Forum 620-622 (aprile 2009): 473–76. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.473.

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A green emitting SrAl2O4:Eu2+, Dy3+ phosphor with high brightness and long afterglow was synthesized by the sol-gel method. SrAl2O4: Eu2+, Dy3+ phosphor exhibited broad band extending from 450 to 650 nm and maximum emission spectra peaking at 520 nm. Three excited levels existed, two shoulders were observed at 270 and 330 nm in addition to the maximum at 360 nm on the excitation spectrum. After the removal of excitation light, the excellent after-glow characteristic of the phosphorescence was obtained as a result of low decay time, although the after-glow intensities of phosphor varied exponentially with the time.

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SOLAINI, Giancarlo, Alessandra BARACCA, Edi GABELLIERI e Giorgio LENAZ. "Modification of the mitochondrial F1-ATPase ∊ subunit, enhancement of the ATPase activity of the IF1–F1 complex and IF1-binding dependence of the conformation of the ∊ subunit". Biochemical Journal 327, n. 2 (15 ottobre 1997): 443–48. http://dx.doi.org/10.1042/bj3270443.

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Treatment of bovine heart submitochondrial particles with a low concentration of 2-hydroxy-5-nitrobenzyl bromide (HNB), a selective reagent for the Trp residue of the ε subunit [Baracca, Barogi, Lenaz and Solaini (1993) Int. J. Biochem. 25, 1269-1275], enhances the ATP hydrolytic activity of the particles exclusively when the natural inhibitor protein IF1 is present. Similarly, isolated F1 [the catalytic sector of the mitochondrial H+-ATPase complex (ATP synthase)] treated with the reagent has the ATPase activity enhanced exclusively if IF1 is bound to it. These experiments suggest that the modification of the ε subunit decreases the inhibitory activity of IF1, eliciting the search for a relationship between the ε subunit and the inhibitory protein. Certainly, a reverse relationship exists because HNB binds covalently to the isolated F1 exclusively when the inhibitory protein is present. This finding is consistent with the existence of the ε subunit in different conformational states depending on whether IF1 is bound to F1 or not. Support for this assertion is obtained by measurements of the intrinsic phosphorescence decay rate of F1, a probe of the Trp ε subunit conformation in situ [Solaini, Baracca, Parenti-Castelli and Strambini (1993) Eur. J. Biochem. 214, 729-734]. A significant difference in phosphorescence decay rate is detected when IF1 is added to preparations of F1 previously devoid of the inhibitory protein. These studies indicate that IF1 and the ε subunit of the mitochondrial F1-ATPase complex are related, suggesting a possible role of the ε subunit in the mechanism of regulation of the mitochondrial ATP synthase.

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Kaya, Selvin Yesilay, Bekir Karasu, Guray Kaya e Erkul Karacaoğlu. "Influences of Eu²⁺ and Dy³⁺ Contents on the Properties of Long Afterglow Strontium Aluminate Phosphors". Advances in Science and Technology 62 (ottobre 2010): 88–94. http://dx.doi.org/10.4028/www.scientific.net/ast.62.88.

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The detailed preparation process of Eu2+ and Dy3+ ion co-doped phosphor powders in Sr4Al14O25:Eu2+/Dy3+ phosphor system with bluish-green long afterglow produced by solid state reaction method under reducing atmosphere is here reported. X-ray diffraction (XRD), scanning electron microscopy (SEM), and particle size analysis were made to assign the effects of Eu and Dy ions on the luminescent properties of the synthesized phosphors, which were determined by measuring the photoluminescence spectra. The maximum emission intensity of these phosphors under excitation was investigated. As a result, the relevant values were obtained from the phosphorescent pigment with 0.21% and 0.05% molar percent of Eu2+ and Dy3+.

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Cho, Min Young, Suman Timilsina, Jong Wook Roh, Walter Commerell, Ho Geun Shin, Yong-Nam Kwon e Ji Sik Kim. "Ultraviolet Light-Responsive Photorheological Fluid for Sensors and Actuators Realized by Phosphorescence Effects and LSTM RNN". Korean Journal of Metals and Materials 59, n. 5 (5 maggio 2021): 346–53. http://dx.doi.org/10.3365/kjmm.2021.59.5.346.

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A photo-rheological fluid (PRF) is a smart fluid which exhibits different viscosity under UV irradiation. A PRF is comprehensively presented in this work, with particular focus on its responses under UV off/on conditions. The isomeric conversion from SP to MC and vice versa under UV off and on, respectively, showed unequal rates of transformation. As a result, a complex non-linear hysteretic response was observed. To be used indifferent types of sensors and actuators which can exploit its rheological properties, it is essential the PRF have linearized hysteresis behavior. To minimize the asymmetric non-linear hysteresis characteristics under UV on and off conditions, the well-known long-lasting phosphor SAO (SrAl2O4:Eu2+, Dy3+) was incorporated. The incorporation of SAO in the PRF improved the linearity of the PRF response, although the conversion rate was not identical under UV off/on conditions. The SAO particles were observed to settle over time due to phase splitting, undermining the usefulness of the SAO-PRF composite. Instead of improving the PRF response by further adjusting the PRF composite, a software approach based on Long Short-Term Memory Recurrent Neural Networks (LSTM RNN) was employed to model and compensate the asymmetric non-linear hysteresis response, ensuring the realization of sensors and actuators that exploit PRF as hardware.

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Murata, Junji, e Masaya Kagawa. "Photo-Assisted Chemical Mechanical Polishing of Si Wafer Using Phosphorescent Particles as a Luminescent Agent". ECS Journal of Solid State Science and Technology 8, n. 11 (2019): P727—P733. http://dx.doi.org/10.1149/2.0161911jss.

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Mokrzyński, Krystian, Olga Krzysztyńska-Kuleta, Marcin Zawrotniak, Michał Sarna e Tadeusz Sarna. "Fine Particulate Matter-Induced Oxidative Stress Mediated by UVA-Visible Light Leads to Keratinocyte Damage". International Journal of Molecular Sciences 22, n. 19 (30 settembre 2021): 10645. http://dx.doi.org/10.3390/ijms221910645.

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The human skin is exposed to various environmental factors including solar radiation and ambient air pollutants. Although, due to its physical and biological properties, the skin efficiently protects the body against the harm of environmental factors, their excessive levels and possible synergistic action may lead to harmful effects. Among particulate matter present in ambient air pollutants, PM2.5 is of particular importance for it can penetrate both disrupted and intact skin, causing adverse effects to skin tissue. Although certain components of PM2.5 can exhibit photochemical activity, only a limited amount of data regarding the interaction of PM2.5 with light and its effect on skin tissue are available. This study focused on light-induced toxicity in cultured human keratinocytes, which was mediated by PM2.5 obtained in different seasons. Dynamic Light Scattering (DLS) and Atomic Force Microscopy (AFM) were employed to determine sizes of the particles. The ability of PM2.5 to photogenerate free radicals and singlet oxygen was studied using EPR spin-trapping and time-resolved singlet oxygen phosphorescence, respectively. Solar simulator with selected filters was used as light source for cell treatment to model environmental lightning conditions. Cytotoxicity of photoexcited PM2.5 was analyzed using MTT assay, PI staining and flow cytometry, and the apoptotic pathway was further examined using Caspase-3/7 assay and RT-PCR. Iodometric assay and JC-10 assay were used to investigate damage to cell lipids and mitochondria. Light-excited PM2.5 were found to generate free radicals and singlet oxygen in season-dependent manner. HaCaT cells containing PM2.5 and irradiated with UV-Vis exhibited oxidative stress features–increased peroxidation of intracellular lipids, decrease of mitochondrial membrane potential, enhanced expression of oxidative stress related genes and apoptotic cell death. The data indicate that sunlight can significantly increase PM2.5-mediated toxicity in skin cells.

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Sato, Hisako, Kenji Tamura, Tomoko Yajima, Fumi Sato e Akihiko Yamagishi. "Chiral phosphorescent probes for amino acids: hybrids of iridium(iii) complexes with synthetic saponite". New Journal of Chemistry 41, n. 7 (2017): 2780–85. http://dx.doi.org/10.1039/c6nj03777a.

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The effects of amino acids on the emission of iridium(iii) complexes adsorbed by colloidal particles of synthetic saponite lead to the conclusion that the interplay between two intramolecular chiral centers achieved enantioselectivity.

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Atabaev, Timur Sh, Hong Ha Thi Vu, Mac Kim, Yong Suk Yang, Hyung-Kook Kim e Yoon-Hwae Hwang. "Effects of Li+ Codoping on the Optical Properties of SrAl2O4 Long Afterglow Ceramic Phosphors". Advances in Optics 2014 (4 agosto 2014): 1–4. http://dx.doi.org/10.1155/2014/459065.

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Rare-earths codoped long afterglow strontium aluminate phosphors with high brightness were synthesized via a facile combustion synthesis method using urea as a fuel. The resulted phosphor particles were analyzed by using X-ray diffraction and field emission scanning electron microscope, whereas their optical properties were monitored by photoluminescence spectroscopy. The prepared SrAl2O4:Eu2+, Dy3+, Li+ samples showed a broad green-yellowish emission, peaking at 512 nm when excited by 348 nm. Compared to traditional SrAl2O4:Eu2+, Dy3+ phosphor, the initial luminescence brightness of SrAl2O4:Eu2+, Dy3+, codoped with Li+ improved from 1.89 cd/m2 to 2.71 cd/m2 and the afterglow decay time was prolonged from 103 to 121 min. The possible mechanism of SrAl2O4:Eu2+, Dy3+, Li+ phosphorescence enhancement has been discussed.

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Kobayashi, Nagao. "SPECTROSCOPICALLY AND/OR STRUCTURALLY INTRIGUING PHTHALOCYANINES AND RELATED COMPOUNDS. PART 2. MONOMERIC SYSTEMS". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, n. 8 (13 agosto 2019): 4–25. http://dx.doi.org/10.6060/ivkkt.20196208.5913_2.

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The second part of the series of review papers on the properties of some synthetically and spectroscopically interesting studies of our group for the period 2007-2017 is presented. In particular, examples of the analysis of spectroscopic data in combination with calculations by the molecular orbitals method are given. We mainly used spectroscopic methods of electron absorption and natural and magnetic circular dichroism, periodically applying fluorescence, phosphorescence and ESR with a time resolution. The spectra of (4n + 2) p systems, as well as some 4np antiaromatic systems, are analyzed theoretically, which helps the reader to interpret the spectral data. In the first and the second parts of this review monomer systems are considered, and in the third - trimeric and tetrameric systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . .. .. .. . . . . . . . . . . . . . . .. . . . . . .. . . .. .. . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . .. . . . . . . . .. .. . . . . . . .. . . . . . . .. . . .. . . . .. . . .. . . . . . .. . . .. .. . . . . . .. . . . .. . .. .. . .

Articoli di riviste sul tema "Particule phosphorescente"

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