- 9-acyl-3-iodocarbazole compound and application thereof as phosphorescent material
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The invention discloses a 9-acyl-3-iodocarbazole compound and application of the 9-acyl-3-iodocarbazole compound as a phosphorescent material. The invention specifically discloses a carbazole compound containing a fragment I. The 9-acyl-3-iodocarbazole compound provided by the invention has a very high phosphorescence emission proportion in a steady-state luminescence spectrum, has a phosphorescence emission proportion exceeding 90%, and has a very low fluorescence emission proportion; and meanwhile, visible light can excite phosphorescence of the compound, and bright phosphorescence emission can be shown in a molecular dispersed solution at room temperature.
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Paragraph 0099-0100
(2021/06/26)
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- Achieving Purely-Organic Room-Temperature Aqueous Phosphorescence via a Two-Component Macromolecular Self-Assembly Strategy
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Manipulation of supramolecular behaviors and aggregation states represents an important topic in devising intriguing photofunctional systems. Here we report a two-component macromolecular self-assembly strategy for achieving aqueous room-temperature phosphorescence (RTP) in purely organic systems. Amphiphilic triblock copolymers are used to modulate the self-assembly of planar RTP molecules in aqueous solution, leading to the formation of sheet-like RTP objects with well-defined morphology, uniform crystalline nanostructures and excellent aqueous dispersity. In contrast, the addition of the planar RTP molecules into aqueous medium only leads to precipitation and quenching of RTP properties. Powder X-ray diffraction and single-crystal X-ray diffraction studies reveal that the amphiphilic triblock copolymers can assist supramolecular columnar packing of the planar RTP molecules where multiple non-covalent interactions stabilize the triplet excited states. Interestingly, it is found that luminescent signals of the sheet-like RTP objects can be extracted from strong fluorescent environments by phosphorescence mode and emission lifetime measurement.
- Guo, Wang,Wang, Xuepu,Zhou, Bei,Zhang, Kaka
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p. 3469 - 3474
(2020/10/02)
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- Heat-activated delay fluorescent material, its synthetic method and using the heat-activated delay of the fluorescent materials of the OLED device (by machine translation)
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The present invention provides a thermally activated delayed fluorescence material, a method of synthesizing the same and an OLED device using the same. The thermally activated delayed fluorescence material includes a structure formula 1 as wherein the group Ar1 is identical to or different from the group Ar2, and the group Ar1 and the group Ar2 are consisted of carbazole and/or phenothiazine. The thermally activated delayed fluorescence material has a higher glass transition temperature, high thermal stability and excellent luminous efficiency. The method of synthesizing the same has simplified steps, easily purified product, high yield, and luminous and thermal properties of the product can be adjusted by connecting to differentiated functional groups. The OLED device using the same has a light emitting layer of high fluorescence efficiency and long-term stability, so that luminous efficiency and service life of the OLED device can meet practical demand.
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Paragraph 0076-0079
(2016/10/17)
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- Modification of a donor-acceptor photovoltaic polymer by integration of optoelectronic moieties into its side chains
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In this study, a strategy to modify photovoltaic properties of a known material by integrating certain optoelectronic moieties in its side chains has been described. Thus, a plenty of single and dendritic carbazole units were introduced into the side chains of poly(2,7-(9,9-dialkyl-fluorene)-alt-5,5′-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)) (PFDTBT), a famous donor-acceptor alternative conjugated polymer, to see what and how they can change the latter optoelectronic properties. It was found that such modifications not only increase the polymer light-harvesting capabilities in the UV region, but also enhance hole mobility in the pure film state. Furthermore, complicated photophysical and photochemical processes, including energy transfer, electron transfer and site-isolation effect, were observed to take place between carbazole units and the PFDTBT conjugated backbone. These factors work comprehensively and finally improve the polymer photovoltaic properties when modified with single carbazole units, but deteriorate when modified with dendritic carbazole units.
- Yu, Lin-Feng,Ge, Cong-Wu,Wang, Jin-Tu,Xiang, Xuan,Li, Wei-Shi
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- Triplet states and energy back transfer of carbazole derivatives
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Intermolecular interactions among π conjugated semiconducting molecules often give rise to totally different optical behaviours between the solid state and dilute phases. Phosphorescence spectra observed in the solid state are often lowered compared with dilute forms resulting in the red-shift of the phosphorescence spectra. Here, we demonstrate that this red-shift can be reduced by introducing side groups. We also show that such a shift is a function of interchromophoric distance with fast exponential decay. Furthermore, we show conclusively that triplet exciton transfer between the hosts and the bis[2-(4F,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(iii) can be described in terms of the Boltzmann factor using triplet energies obtained from the solid state. These results will have implications in molecular design that utilizes triplet excitons such as organic light emitting diodes and singlet fission solar cells.
- Woon, Kai Lin,Hasan, Zainal A.,Ong, Bee Kian,Ariffin, Azhar,Griniene, Raimonda,Grigalevicius, Saulius,Chen, Show-An
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p. 59960 - 59969
(2015/07/27)
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- Synthesis of asymmetrically arranged dendrimers with a carbazole dendron and a phenylazomethine dendron
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Asymmetrically arranged dendrimers with a carbazole dendron and a phenylazomethine dendron were synthesized by the combination of Ullmann reaction and a dehydration reaction in the presence of titanium tetrachloride. Stepwise complexation in the phenylazo
- Kimoto, Atsushi,Cho, Jun-Sang,Higuchi, Masayoshi,Yamamoto, Kimihisa
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p. 5531 - 5537
(2007/10/03)
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- Synthesis of Novel Carbazole Dendrimers Having a Metal Coordination Site
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We have synthesized novel carbazole dendrimers via cyclo-trimerization. This synthetic procedure to prepare the dendrimers, especially with a higher generation, via the cyclization reaction was found to be an extremely effective method. These dendrimers have the ability to assemble metal ions such as Sn 2+ and Eu3+, resulting in a change in its fluorescence property.
- Kimoto, Atsushi,Cho, Jun-Sang,Higuchi, Masayoshi,Yamamoto, Kimihisa
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p. 674 - 675
(2007/10/03)
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