- C2-, C3- spirobifluorene fused carbazole modified triazine as an electron transport type host of exciplex
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In this work, we report a novel spirobifluorene carbazole (SBFCbz) donor developed by fusion of carbazole with 9,9′-spirobi[fluorene] (SBF) unit. The newly synthesized SBFCbz donor combined with a diphenyl triazine acceptor to offer an 5'-(4,6-diphenyl-1,3,5-triazin-2-yl)-5′H-spiro[fluorene-9,11′-indeno[1,2-b]carbazole] (SBFTrz) host which played a role of an n-type host. An exciplex host of SBFTrz: 9-([1,1′-biphenyl]-4-yl)-9′-phenyl-9H,9′H-3,3′-bicarbazole (BPBPCz) was developed by combining it with a p-type BPBPCz host. The developed exciplex host showed triplet energy of 2.59 eV, making it a suitable host for the green and red phosphorescent organic light-emitting diodes (PhOLEDs). The PhOLEDs fabricated using the exciplex host system offered excellent charge balance in the emitting layer, which resulted in above 20% external quantum efficiency (EQE) and resistance to the efficiency roll-off at high luminance. The green and red PhOLEDs developed showed the maximum EQE/EQE at 1000 cd/m2 of 22.0/21.7% and 26.2/23.2%, respectively. Besides, the SBFTrz: BPBPCz exciplex host-based green and red devices showed three- and five-fold enhancement, respectively, in the operational lifetime compared to their corresponding SBFTrz single host devices. Thus, the above results confirmed the suitability of the SBFTrz: BPBPCz exciplex as a host to develop PhOLEDs with high efficiency, improved stability at high luminance, and a long operational lifetime.
- Patil, Vilas Venunath,Lim, Junseop,Lee, Jun Yeob
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- Organic compound and electronic element and electronic device comprising same
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The invention provides an organic compound and an electronic element and an electronic device thereof, and belongs to the technical field of organic electroluminescence. The organic compound has a structural formula shown 1, wherein the organic compound h
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Paragraph 0113; 0180-0184; 0187
(2021/11/26)
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- Five-membered heterocyclic derivative and organic electroluminescent device thereof
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The invention provides a five-membered heterocyclic derivative and an organic electroluminescent device thereof, and relates to the technical field of organic photoelectric materials. The five-membered heterocyclic derivative is formed by combining a five-membered nitrogen-containing heterocycle and a rigid large group, and the specific structure enables the five-membered heterocyclic derivative to have good electron transport performance, high glass transition temperature and thermal stability, strengthens the rigidity and asymmetry of molecules, avoids intermolecular aggregation, and has non-crystalliability between molecules. The utility model has the advantages of uneasy aggregation and good film forming performance. The organic electroluminescent device manufactured by using the derivative has the characteristics of good photoelectric property, low driving voltage, high luminous efficiency, long service life and the like.
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Paragraph 0132-0134
(2021/08/25)
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- Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo(p-phenylene)s
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Frequency-upconverted fluorescence and stimulated emission induced by multiphoton absorption (MPA) have attracted much interest. As compared with low-order MPA processes, the construction of high-order MPA processes is highly desirable and rather attracti
- Jiang, Yi,Li, King Fai,Gao, Kun,Lin, He,Tam, Hoi Lam,Liu, Yuan-Yuan,Shu, Yu,Wong, Ka-Leung,Lai, Wen-Yong,Cheah, Kok Wai,Huang, Wei
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p. 10007 - 10015
(2021/04/15)
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- Compound, organic light emitting diode, and display device
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The invention provides a compound for fabricating an electron transport layer. The compound has a molecular formula as described in the specification. The invention also provides an organic light emitting diode and an organic light emitting diode display
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Paragraph 0095; 0099-0102
(2020/10/14)
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- C1-Linked Spirobifluorene Dimers: Pure Hydrocarbon Hosts for High-Performance Blue Phosphorescent OLEDs
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Reported here are C1-linked spiro-bifluorene dimers. A comprehensive study is carried out to analyze the electronic properties of these highly twisted structures. This work shows that the C1-position enables the design of pure hydrocarbon materials, with a high triplet energy, for hosting blue phosphors in efficient phosphorescent OLEDs (PhOLEDs). To date, this work describes the highest performance of blue PhOLEDs ever reported for pure hydrocarbons (external quantum efficiency of ca. 23 %), thus highlighting the potential of the C1-spirobifluorene scaffold in organic electronics.
- Sicard, Lambert J.,Li, Hong-Cheng,Wang, Qiang,Liu, Xiang-Yang,Jeannin, Olivier,Rault-Berthelot, Jo?lle,Liao, Liang-Sheng,Jiang, Zuo-Quan,Poriel, Cyril
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supporting information
p. 3848 - 3853
(2019/02/24)
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- Anthracene derivative, and preparation method and application thereof
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The invention discloses an anthracene derivative, and a preparation method and an application thereof. The anthracene derivative has a chemical structure represented by formula (I) or formula (II). The efficient fluorescence quantum efficiency of anthracene used a bridge, the electron withdrawing property of a cyano group and the electron donating property of a fluorenyl group make the injection and transport of carriers balanced, so the performances of devices are easily improved; and the anthracene derivative also contains the fluorenyl group with a large steric hindrance distorted structure, so the aggregated state fluorescence quantum efficiency of a solid state thin film is improved, and the anthracene derivative can efficiently emit blue light in organic solvents. The invention alsoprovides the preparation method of the anthracene derivative, and the application of the anthracene derivative in the preparation of blue light-emitting materials, light-emitting devices or intelligent materials.
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Paragraph 0066; 0071-0075
(2019/11/29)
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- Synthesis of 9,9′-Spirobifluorenes and 4,5-Diaza-9,9′-spirobifluorenes and Their Application as Affinity Materials for Quartz Crystal Microbalances
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Two different classes of aza analogues of 9,9′-spirobifluorenes have been synthesized. These were obtained by either furnishing the spirobifluorene with additional pyridyl moieties or by installing the aza function directly into the spirobifluorene core. These structurally rigid compounds were then evaluated as affinity materials for quartz crystal microbalances and proved to be highly potent for the detection of volatile organic compounds.
- Stobe, Caroline,Pyka, Isabella,Linke, Alexander,Müller, Sarah,Schnakenburg, Gregor,Waldvogel, Siegfried R.,Lützen, Arne
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p. 758 - 769
(2017/06/06)
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- Syntheses and characterizations of high refractive index and low birefringence polyimides containing spirobifluorene in the side chain
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Two new diamine monomers having a spirobifluorene structure were synthesized through four steps, and polymerized with three different dianhydrides (PMDA, CBDA and 6FDA) to obtain six polyimides with spirobifluorene structure in the side chain. All the res
- Wen, Pushan,He, Rui,Li, Xiang-Dan,Lee, Myong-Hoon
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- New organic compounds and organic electroluminescent device comprising the same
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Provided are an organic compound represented by chemical formula 1 and an organic electroluminescent device comprising the same. The organic compound can be applied to an organic electroluminescent device as a hole transfer material, an electron transfer material or a host material of a light emitting layer, and can improve light emitting efficiency, stability and lifespan of the organic electroluminescent device.COPYRIGHT KIPO 2017
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Paragraph 0119-0122; 0138-0140
(2017/09/23)
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- MATERIALS FOR ORGANIC ELECTROLUMINESCENT DEVICES
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The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.
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Page/Page column 66; 67
(2016/06/15)
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- COMPOUND FOR ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTRONIC ELEMENT USING THE SAME, AND AN ELECTRONIC DEVICE THEREOF
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Provided in the present invention are: a novel compound, capable of improving lifespan, stability, and light emitting efficiency of an element; an organic electrical element using the same; and an electronic device thereof. The compound is represented by chemical formula (1).COPYRIGHT KIPO 2016
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Paragraph 0136-0140
(2016/10/08)
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- Spirobifluorene/sulfone hybrid: Highly efficient solution-processable material for UV-violet electrofluorescence, blue and green phosphorescent OLEDs
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A high efficient UV-violet emission type material bis[4-(9,9′- spirobifluorene-2-yl)phenyl] sulfone (SF-DPSO) has been synthesized by incorporating electron deficient sulfone and morphologically stable spirobifluorene into one molecule. The steric and bulky compound SF-DPSO exhibits an excellent solid state photoluminescence quantum yield (ΦPL = 92%), high glass transition temperature (Tg = 211 °C) and high triplet energy (ET = 2.85 eV). In addition, the uniform amorphous thin film could be formed by spin-coating from its solution. These promising physical properties of the material made it suitable for using as UV-violet emitter in non-doped device and appropriate host in phosphorescent OLEDs. With SF-DPSO as an emitter, the non-doped solution processed device achieved an efficient UV-violet emission with the EL peak around 400 nm. By using SF-DPSO as a host, solution processed blue and green phosphorescent organic light emitting diodes showed a high luminous efficiency of 13.7 and 30.2 cd A-1, respectively.
- Ban, Xinxin,Xu, Huange,Yuan, Guolong,Jiang, Wei,Huang, Bin,Sun, Yueming
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p. 1678 - 1686
(2014/06/23)
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- Novel violet emitting material synthesized by stepwise chemical reactions
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In this paper, we report the design and synthesis of a novel bipolar violet emitting molecule CzPySiSF. The carbazole and pyridine moieties are employed to facilitate charge injection and balance carrier transport, whereas the spirofluorene is used as the violet emitter. The three functional groups, i.e., carbazole, pyridine and spirofluorene, are connected to tetraphenylsilane in a stepwise fashion using classical coupling reactions such as Suzuki and Ullmann. The resultant bipolar molecule CzPySiSF exhibits very stable thermal properties and a uniform amorphous morphology. The introduction of spirofluorene greatly enhances the fluorescence quantum efficiency of the molecule; moreover the PL spectrum of CzPySiSF in THF is mainly located in the violet region. The EL spectrum of CzPySiSF matches well with the PL spectrum with a maximum at 408 nm. The violet OLED of CzPySiSF exhibits the maximum external quantum efficiency of 0.59%. This journal is the Partner Organisations 2014.
- Tang, Xiangyang,Yao, Liang,Liu, He,Shen, Fangzhong,Zhang, Shitong,Zhang, Yunan,Zhang, Huanhuan,Lu, Ping,Ma, Yuguang
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p. 5019 - 5027
(2014/06/24)
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