- Ultrafast intramolecular energy transfer in a nanostructured organosilicon luminophore based on p -terphenyl and 1,4-bis(5-phenyloxazol-2-yl)benzene
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We report on the first experimental and theoretical investigations of ultrafast intramolecular energy transfer for a novel class of highly luminescent materials-nanostructured organosilicon luminophores (NOLs). For this purpose we designed, synthesized an
- Ponomarenko, Sergey A.,Surin, Nikolay M.,Skorotetcky, Maxim S.,Borshchev, Oleg V.,Pisarev, Sergey A.,Svidchenko, Evgenia A.,Fedorov, Yuriy V.,Molins, Francesc,Brixner, Tobias
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- Linear Extension of Anthracene via B←N Lewis Pair Formation: Effects on Optoelectronic Properties and Singlet O2 Sensitization
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The functionalization of polycyclic aromatic hydrocarbons (PAHs) via B←N Lewis pair formation offers an opportunity to judiciously fine-tune the structural features and optoelectronic properties, to suit the demands of applications in organic electronic devices, bioimaging, and as sensitizers for singlet oxygen generation. We demonstrate that the N-directed electrophilic borylation of 2,6-di(pyrid-2-yl)anthracene offers access to linearly extended acene derivatives Py-BR (R=Et, Ph, C6F5). In comparison to indeno-fused 9,10-diphenylanthracene, the formal “BN for CC” replacement in Py-BR selectively lowers the LUMO, resulting in a much reduced HOMO–LUMO gap. An even more extended conjugated system with seven six-membered rings in a row (Qu-BEt) is obtained by borylation of 2,6-di(quinolin-8-yl)anthracene. Fluorinated Py-BPf shows particularly advantageous properties, including relatively lower-lying HOMO and LUMO levels, strong yellow-green fluorescence, and effective singlet oxygen sensitization, while resisting self-sensitized conversion to its endoperoxide.
- Vanga, Mukundam,Sahoo, Ashutosh,Lalancette, Roger A.,J?kle, Frieder
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- Synthesis of Nanostructured Organosilicon Luminophores Based on Phenyloxazoles
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A series of nanostructured organosilicon luminophores (NOLs) composed of a central 1,4-bis(5-phenyl-1,3-oxazol-2-yl)benzene (POPOP) acceptor chromophore and various peripheral p-terphenyl and 2,5-diphenyl-1,3-oxazole donor fragments have been synthesized for the first time using van Leusen reaction and direct palladium-catalyzed C-arylation of oxazole ring. Due to different functionalities of the silicon branching centers, NOLs with different donor-acceptor ratios have been obtained. The synthesized structures are expected to possess good optical characteristics for use in photonics and optoelectronics.
- Skorotetcky,Borshchev,Cherkaev,Ponomarenko
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- ORGANIC COMPOUNDS, LIGHE EMITTING DIODE AND LIGHT EMITTING DEVICE HAVING THE COMPOUNDS
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The present invention relates to an organic compound having an amine core substituted with three aromatic rings, wherein a part of the three aromatic rings is substituted with a functional group capable of a solution process while the rest of the three aromatic rings is substituted with a hetero-aromatic functional group; and a light-emitting diode and a light-emitting device having the organic compound applied to a light-emitting layer. The organic compound may be used to the light-emitting layer to eliminate the HOMO energy barrier between the light-emitting layer and another light-emitting layer adjacent thereto. Also, the organic compound, when it forms a light-emitting layer in combination with light-emitting particles, may improve interfacial properties between the light-emitting layer and an adjacent layer to improve morphological properties of the light-emitting diode. The organic compound of the present invention, by allowing holes and electrons to be transported and implanted into a light emitting material layer in a balanced manner, may implement light-emitting diodes and light-emitting devices with improved luminance efficiency and capable of low-voltage driving.(110) First electrode(120) Second electrode(AA) Smooth interface morphology ↑COPYRIGHT KIPO 2019
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Paragraph 0189; 0193-0195
(2019/08/06)
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- Synthesis and photovoltaic performance of pyrazinoquinoxaline containing conjugated thiophene-based dendrimers and polymers
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Pyrazinoquinoxaline-based building blocks were incorporated into both π-conjugated dendrimers and polymers. The dendrimers were synthesized using a convergent/divergent approach whereas the donor/acceptor copolymers were synthesized via Stille cross-coupling reactions. The structurally defined dendrimers and the π-conjugated polymers were investigated with respect to their optical and electronic properties as well as their performance in photovoltaic devices. Because of the presence of the electron-deficient pyrazinoquinoxaline moiety, the absorption spectra of the materials under investigation were red-shifted with respect to the all thiophene-containing materials. Power conversion efficiencies up to 1.7 and 0.8% were obtained from blends of second-generation dendrimers and polymers with PC71BM, respectively.
- Schulz, Gisela L.,Mastalerz, Michael,Ma, Chang-Qi,Wienk, Martijn,Janssen, Rene,Baeuerle, Peter
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p. 2141 - 2151
(2013/05/22)
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