- Silicon-containing dendritic tris-cyclometalated Ir(iii) complex and its electrophosphorescence in a polymer host
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In this paper, we present the synthesis and characterization of a new highly phosphorescent cyclometalated Ir(iii) complex with a silane-based dendritic substituent. The Ir(iii) complex showed 74 ± 3% of absolute phosphorescence quantum efficiency in the film state. In addition, efficient electrophosphorescence (32.8 cd A-1) employing an Ir(iii) complex-poly(N-vinylcarbazole) system device is observed. Study of a series of electroluminescent, spectroscopic, and electrochemical data of the Ir(iii) complex and the reference Ir(ppy)3 reveals superior performance of the new Ir(iii) complex. The Royal Society of Chemistry.
- You, Youngmin,An, Cheng-Guo,Lee, Deug-Sang,Kim, Jang-Joo,Park, Soo Young
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Read Online
- A deep red phosphorescent Ir(III) complex for use in polymer light-emitting diodes: Role of the arylsilyl substituents
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(Figure Presented) Here we report the synthesis and electrophosphorescence of a new deep-red phosphorescent Ir(III) complex with spatially embracing and thus solubilizing arylsilyl-substituted ligands, Ir(III) tris(2-(2′- benzo[b]thienyl)-5-(4′-triphenylsilylphenyl)pyridinato-N,C 3′). A poly(N-vinylcarbazole) (PVK) film doped with this Ir(III) complex exhibited excellent phase homogeneity and showed saturated red electrophosphorescence of 2.7% maximum external quantum efficiency, whose Commission Internationale de L'Eclairage coordinates were (0.69, 0.30).
- You, Ngmin,An, Cheng-Guo,Kim, Jang-Joo,Soo, Young Park
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Read Online
- Highly thermally-stable 4,4′-bis(4″-triphenylsilylphenyl)-1,1′- binaphthalene as the ultraviolet amplified spontaneous emitter, efficient host and deep-blue emitting material
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We report herein the synthesis and characterization of an efficient versatile binaphthyl derivative, 4,4′-bis(4″-triphenylsilylphenyl)-1,1′-binaphthalene (SiBN) with a high glass transition temperature of 159.3 °C. Its role as a lasing dye was demonstrated by the amplified spontaneous emission, which exhibited an ultraviolet peak of 397 nm with a low threshold of 20 μJ/pulse. Meanwhile, the lasing film and blue electroluminescent device employing this novel binaphthyl derivative as the host showed superior performances to the reference based on the conventional host 4,4′-bis(carbazol-9-yl)biphenyl. Finally, extremely stable colour-tunable deep-blue (436 nm/472 nm) organic electroluminescent devices based on SiBN were demonstrated with very high brightness (>7521.2 cd/m2) and high external quantum efficiencies (1.90% for 436 nm and 4.66% for 472 nm emission). The development of such functional versatility materials will be an effective method for reducing the cost of organic photoelectric devices.
- Li, Weiling,Xu, Tao,Chen, Guo,Zhakng, Hao,Gao, Xicun,Zhou, Xuehua,Huang, Haifang,Fan, Heliang,Cai, Miao,Zhang, Xiaowen,Yang, Lianqiao,Zhu, Wenqing,Wei, Bin
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Read Online
- An electroluminescen compound and an electroluminescent device comprising the same
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The present invention relates to an organic light-emitting compound represented by chemical formula 1. An organic electroluminescent device comprising the organic light-emitting compound in the present invention has excellent power efficiency, light-emitting efficiency, and long life cycle because the present invention can be operated by a lower driving-voltage in comparison to a device comprising conventional phosphorescent host materials. [Chemical formula 1].
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Paragraph 0592-0596
(2021/07/13)
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- Silicon-containing substituted metal complex
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The invention discloses a silicon-containing substituted metal complex. The novel silicon-containing substituted metal complex has a general formula of M (La) m (Lb) n (Lc) q, and the ligand La is a ligand with silicon group substitution and can be used as a luminescent material in an electroluminescent device. The novel metal complexes have the advantages of remarkably improving the quantum efficiency of the material, effectively controlling the light-emitting wavelength and the light-emitting color and reducing the driving voltage, and can provide better device performance. The invention also discloses an electroluminescent device and a compound formulation.
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Paragraph 0224-0227
(2021/07/10)
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- An electroluminescent compound and an electroluminescent device comprising the same
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The present invention relates to an organic light-emitting compound represented by [Chemical formula 1]. An organic electroluminescent device comprising the organic light-emitting compound in the present invention has excellent power efficiency, light-emitting efficiency, and long life cycle because the present invention can be operated by a lower driving-voltage in comparison with a device comprising conventional phosphorescent host materials. [Chemical formula 1].
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Paragraph 0694; 0707-0710
(2020/09/26)
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- An organoelectro luminescent compounds and organoelectro luminescent device using the same
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The present invention relates to an organic light emitting compound represented by Formula I or Formula III, and an organic electroluminescent device including the same. The organic light-emitting compound according to the present invention has excellent brightness and luminous efficiency, and can be driven at a low voltage and has improved power efficiency. A compound of the formula I: No.No. STRIII No.No. wherein X represents a hydrogen atom or a methyl group. (by machine translation)
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Paragraph 0455-0459
(2020/11/03)
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- Aromatic compound and organoelectro luminescent device comprising the compound
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The present invention relates to an aromatic compound denoted by chemical formula 1, and an organic electroluminescent device comprising the compound. The organic electroluminescent device comprising the aromatic compound by the present invention has low driving voltage, and excellent lifetime properties and luminance efficiency.
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Paragraph 0791; 0798-0803
(2020/12/08)
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- An organoelectro luminescent compounds and organoelectro luminescent device using the same
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The present invention relates to an organic light emitting compound represented by chemical formula I to III, and to an organic electroluminescent device including the same. According to the present invention, the organic electroluminescent device including the organic light emitting compound uses low driving voltages and has excellent efficiency of light emission.
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Paragraph 0452-0456
(2021/01/06)
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- An electroluminescen compound and an electroluminescent device comprising the same
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The present invention relates to an organic light-emitting compound represented by chemical formula 1. An organic electroluminescent device comprising the organic light-emitting compound in the present invention has excellent power efficiency, light-emitting efficiency, and long life cycle because the present invention can be operated by a lower driving-voltage in comparison with a device comprising conventional phosphorescent host materials.
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Paragraph 0634-0638
(2021/02/02)
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- COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME
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Provided is a compound represented by Formula 1 and an organic light-emitting device including the same. The organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer and the compound represented by Formula 1.
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Paragraph 0367-0369
(2020/09/09)
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- Diazcarbazole derivative, preparation method thereof, and application of diazcarbazole derivative as electroluminescent material
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The invention belongs to the technical field of organic photoelectric material application, and particularly relates to a diazcarbazole derivative with different relative positions of N atoms and an application of the diazcarbazole derivative as an electroluminescent material. Carbazole-like group diazcarbazole with an electron-deficient property is introduced, and a triplet state of the materialcan be realized and the molecular orbital energy level can be adjustable through bonding with different groups, so that efficient recombination of carriers in an organic electroluminescent device is achieved fundamentally, an efficient and energy-saving organic light emitting diode (OLED) device is obtained, and the diazcarbazole derivative can be widely applied to the field of organic electroluminescence. The structural general formula of the material is as shown in the formula I, wherein a same diazcarbazole (diazcarbazole with N positions of 1,8, 1,7, 1,6, 2,7, 2,6, 2,5, 3,6, 3,5, and 4,5)is taken as a core, the L group is a bridging group for bonding the diazlocarbazole, the L group is selected from aromatic groups or aromatic heterocyclic groups containing heteroatoms, m and n are the numbers of the diazicarbazole, and the sum of m and n is greater than or equal to 1.
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Paragraph 0172; 0173; 0174
(2019/03/26)
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- Novel aryl phosphine organic photoelectric material based on carbazole unit as core and preparation method and application thereof
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The invention discloses a novel aryl phosphine organic photoelectric material modified by tetraphenylsilane base on a carbazole unit as cores. By combination of the advantages of phosphine group and silicon-based photoelectric functional materials, the carbazole is used as the core, and a diphenylphosphine oxide/sulfur unit and a tetraphenylsilane unit are connected to the carbazole center core toobtain two materials DPOSi and DPSSi with excellent photoelectric properties. Blue light phosphorus photoelectric electroluminescent devices (PhOLEDs) prepared by the two materials have higher deviceproperties, and the highest external quantum efficiency reaches 20.8%.
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Paragraph 0021
(2019/11/20)
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- Silicon-containing organic electroluminescent material and preparation method thereof
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The invention discloses a silicon-containing organic electroluminescent material and a preparation method thereof, and belongs to the field of organic electroluminescent materials. The method comprises the following steps: firstly, synthesizing 4-bromophenyltriphenylsilane from triphenylchlorosilane and p-bromoiodobenzene; and then based on a synthetic product of 4-bromophenyl triphenylsilane andp-substituted haloarylboronic acid, and a synthetic product of an aryl halide and a 9,9-alkyl-2-aminofluorene compound, respectively synthesizing a silicon-containing organic electroluminescent material with R1 being an unsubstituted group and a silicon-containing organic electroluminescent material with R1 being an organic substituent. The silicon-containing organic electroluminescent material isa triarylamine compound which takes tetraphenylsilicon as a center and contains a fluorene-like structure. The material has good hole transport performance and can be used as a hole transport layer in an organic electroluminescent device. The organic electroluminescent material has good thermal stability.
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Paragraph 0063; 0069-0074; 0095; 0101-0106; 0134-0139
(2019/10/01)
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- A silicon-containing organic electroluminescent material and its application and its manufacturing device
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The invention relates to a silicon-containing organic electroluminescent material and an application thereof as well as a device manufactured by using the silicon-containing organic electroluminescent material. The silicon-containing organic electroluminescent material is a compound which is formed by centering on naphthyridine substituted tetraphenyl-silicon and introducing substituent groups with relatively good electronic transmission performance into benzene rings. The silicon-containing organic electroluminescent material can serve as an electron transport layer of an organic electroluminescent device. The material provided by the invention has relatively good thin-film stability, appropriate energy level and wide application prospect in the organic electroluminescent device, can serve as an electron transport material to be applied to the organic electroluminescent device and is capable of remarkably improving the color purity of blue light devices.
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Paragraph 0026; 0069; 0070
(2016/12/01)
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- Yellow electrophosphorescent devices with hosts containing N1-(naphthalen-1-yl)-N1,N4-diphenylnaphthalene-1,4-diamine and tetraphenylsilane units
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Two novel host materials, N1-(naphthalen-1-yl)-N1,N4-diphenyl-N4-(4-(triphenylsilyl)phenyl) naphthalene-1,4-diamine (SiP) and N1-(naphthalen-1-yl)-N1,N4-diphenyl-N4-(3-(triphenylsilyl) phenyl)naphthalene-1,4-diamine (SiM), were synthesised by incorporating a hole-transporting moiety, N1-(naphthalen-1-yl)-N1,N4-diphenylnaphthalene-1,4-diamine (NPNA2) and typical electron-transporting tetraphenylsilane moiety. SiP and SiM materials exhibit high thermal and morphological stability with a glass transition temperature higher than 110°C and decomposition temperature above 350°C. Using Ir(bt)2(acac) (bis(2-phenylbenzothiozolato-N,C2′)iridium(acetylacetonate)) as an emitter, yellow phosphorescent organic light-emitting diodes of ITO/TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 40 nm)/host: Ir(bt)2(acac) (15 wt%, 20 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 40 nm)/LiF (1 nm)/Al (100 nm) show maximum current and power efficiency of 40.81 cd A-1 and 33.60 lm W-1 with low efficiency roll-off. The current efficiency of 40.10 cd A-1 is still observed at the practically useful brightness value of 1000 cd m-2.
- Zhang, Song,Xu, Qiu-Lei,Jing, Yi-Ming,Liu, Xuan,Lu, Guang-Zhao,Liang, Xiao,Zheng, You-Xuan,Zuo, Jing-Lin
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p. 27235 - 27241
(2015/03/31)
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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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- An efficient AIE-active blue-emitting molecule by incorporating multifunctional groups into tetraphenylsilane
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A multifunctional AIE-active molecule, CzPySiTPE, in which carbazole (Cz) and pyridine (Py) were attached to tetraphenylsilane to facilitate carrier injection has been designed and synthesized. Tetraphenylethene (TPE) was adopted to maintain efficient blue emission. Blue electroluminescent (EL) emission of CzPySiTPE was obtained with CIE coordinates of (0.16, 0.17) and an external quantum efficiency of 1.12 %. A multifunctional AIE-active molecule has been synthesized to combine the merits of carbazole, pyridine, and tetraphenylethene moieties. This molecule exhibits blue emission with CIE coordinates of (0.16, 0.17) and an external quantum efficiency of 1.12 % (see figure; AIE=aggregation induced emission).
- Tang, Xiangyang,Yao, Liang,Liu, He,Shen, Fangzhong,Zhang, Shitong,Zhang, Huanhuan,Lu, Ping,Ma, Yuguang
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supporting information
p. 7589 - 7592
(2014/07/07)
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- Synthesis and characterization of highly stable and efficient star-molecules
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A series of well-defined star-shaped molecules have been synthesized by Pd-catalyzed Suzuki cross-coupling starting from very simple reactants with 1,3,5-trisubstituted benzene, 2,4,6-trisubstituted pyridine and trisubstituted phenylcarbazole as the backbones. These star-molecules are all soluble in common organic solvents and electrochemically stable with reversible cyclic voltammographs and high lying HOMOs. They exhibit excellent blue-fluorescence with quantum yield up to 0.87 and high glass transition temperatures. These molecules offer potential as pure blue-light emitting, hole-transport or host materials for optoelectronic applications.
- Huang, Hai-Fang,Xu, Shi-Hua,He, Yan-Bo,Zhu, Cai-Cai,Fan, He-Liang,Zhou, Xue-Hua,Gao, Xi-Cun,Dai, Yan-Feng
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p. 705 - 713
(2013/03/13)
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- Chiral ditopic cyclophosphazane (CycloP) ligands: Synthesis, coordination chemistry, and application in asymmetric catalysis
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A series of dichlorocyclophosphazanes [{ClP(μ-NR)}2] containing chiral and achiral R groups was obtained from simple commercially available amines and PCl3. Their condensation reactions with axially chiral biaryl diols yielded ansa-bridged chiral cyclophosphazane (CycloP) ligands. This highly modular methodology allows extensive elaboration of the ligand set, in which the chirality can be introduced at the diol bridge and/or the amido R group. This provides the possibility to observe match and mismatch effects in catalysis. A series of twenty CycloP ligands was synthesized and characterized by multinuclear NMR spectroscopy, HRMS, elemental analysis, and in selected cases, single-crystal X-ray diffraction. These studies show that all of the ditopic CycloP ligands are C2 symmetric, rendering their metal coordination sites symmetry equivalent. Two well-established enantioselective reactions were explored by using late-transition metal CycloP complexes as catalysts; the gold-catalyzed hydroamination of γ-allenyl sulfonamides and the asymmetric nickel-catalyzed three-component coupling of a diene and an aldehyde. The steric demands of the CycloP ligands have a subtle influence on the reactivity and selectivity observed in both reactions. Good enantiomeric ratios (e.r.) as high as 89:11 in the gold-catalyzed reaction and 92:8 in the nickel-catalyzed bis-homoallylation reaction were observed. One ligand - two chiral binding sites: A library of new, chiral, bridged cyclophosphazane ligands, in which chirality can be introduced at two positions (at the bridge and/or at the phosphorus bridging amido groups), gives rise to good enantiomeric ratios in AuI- and Ni0-catalyzed enentioselective reactions (see scheme, Ts=tosyl). Copyright
- Roth, Torsten,Wadepohl, Hubert,Wright, Dominic S.,Gade, Lutz H.
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supporting information
p. 13823 - 13837
(2013/10/22)
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- Separation of electrical and optical energy gaps for constructing bipolar organic wide bandgap materials
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An electrical and optical energy gaps separation strategy is put forward for the design of organic wide bandgap semiconductors. This new principle could achieve optimization of wide bandgap (both high singlet and triplet energies) and favorable carrier injection energy levels simultaneously.
- Hu, Dehua,Shen, Fangzhong,Liu, He,Lu, Ping,Lv, Ying,Liu, Dandan,Ma, Yuguang
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supporting information; experimental part
p. 3015 - 3017
(2012/04/04)
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- Tuning the solid-state luminescence of bodipy derivatives with bulky arylsilyl groups: Synthesis and spectroscopic properties
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Boron dipyrromethenes (BODIPYs) with bulky triphenylsilylphenyl(ethynyl) and triphenylsilylphenyl substituents on pyrrole sites were prepared via Hagihara-Sonogashira and Suzuki-Miyaura cross-coupling with ethynyl-terminated tetraphenylsilane and boronic acid-terminated tetraphenylsilane. The chromophores are designed to prevent intermolecular p-p stacking interaction and enhance fluorescence in the solid state. Single crystals of 1a and 2b for X-ray structural analysis were obtained, and weak p-p stacking interactions of the neighboring BODIPY molecules were observed. Spectroscopic properties of all of the dyes in various solvents and in films were investigated. Triphenylsilylphenyl-substituted BODIPYs generally show more pronounced increases in solid-state emission than triphenylsilylphenyl(ethynyl)-substituted BODIPYs. Although the simple BODIPYs do not exhibit any fluorescence in the solid state (F=0), arylsilyl-substituted BODIPYs exhibit weak to moderate solid-state fluorescence with quantum yields of 0.03, 0.07, 0.10, and 0.25. The structure-property relationships were analyzed on the basis of X-ray crystallography, optical spectroscopy, cyclic voltammetry, and theoretical calculations.
- Lu, Hua,Wang, Qiuhong,Gai, Lizhi,Li, Zhifang,Deng, Yuan,Xiao, Xuqiong,Lai, Guoqiao,Shen, Zhen
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supporting information; experimental part
p. 7852 - 7861
(2012/09/07)
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- New pyridopyrazine skelecton-based electron-transporting materials
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2,3-Di(pyridine-2-yl)-7-(4-triphenylsilyl)phenyl)pyrido[2,3-b]pyrazine (DPPP) containing pyridopyrazine was designed and synthesized as a new electron-transporting material for organic lightemitting devices (OLEDs). The obtained material forms homogeneous and stable amorphous film. The new synthesized showed the reversible cathodic reduction for hole blocking material and the low reduction potential for electron transporting material in organic EL devices. The molecule possess excellent thermal stability with glass transition temperature (Tg) of 115 °C in nitrogen. DNTPD (60 nm)/NPD (30 nm)/CBP:Irppy 6% (40 nm)/BAlq (10 nm)/ETL (30 nm)/LiF (0.5 nm)/Al structured device were fabricated using DPPP as electron transport material. The maximum luminance reached at 25000 cd/m2. The current efficiency was 10.9 cd/A even high current. Copyright
- Kim, Ran,Oh, Dae Hwan,Hwang, Moon Chan,Baek, Jang Yeol,Shin, Sung Chul,Kwon, Soon-Ki,Kim, Yun-Hi
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experimental part
p. 4370 - 4374
(2012/09/22)
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- NOVEL ORGANIC ELECTROLUMINESCENT COMPOUNDS AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
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Provided are novel organic electroluminescent compounds and organic electroluminescent devices using the same. Since the organic electroluminescent compound exhibits good luminous efficiency and excellent life property compared to the existing material, it may be used to manufacture OLED devices having superior operation life and consuming less power due to improved power efficiency.
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Page/Page column 24
(2011/02/24)
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- External quantum efficiency above 20% in deep blue phosphorescent organic light-emitting diodes
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Highly efficient deep blue phosphorescent organic light-emitting diodes (PHOLEDs) with external quantum efficiency above 20% are developed using a bipolar-type high-triplet-energy host material and a high-triplet-energy exciton blocking material. Maximum quantum efficiency of 25.1% and low roll-off (still 23.1% at 1000 cd m-2) are achieved in these deep blue PHOLEDs. Copyright
- Jeon, Soon Ok,Jang, Sang Eok,Son, Hyo Suk,Lee, Jun Yeob
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scheme or table
p. 1436 - 1441
(2012/02/13)
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- NAPHTHYL CARBAZOLE DERIVATIVES, KL HOST MATERIAL, THE ORGANIC LIGHT EMITTING DEVICE EMPLOYING THE SAME, THE DISPLAY DEVICE AND THE ILLUMINATION DEVICE EMPLOYING THE SAME
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Naphthylcarbazole derivatives are provided. The naphthylcarbazole derivatives are represented by Formula 1. Further provided are KL host materials, organic electroluminescent devices employing the host materials, and displays and lighting systems comprising the devices.
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- BIS-TRIPHENYLSILYL COMPOUNDS AND THEIR APPLICATION ON ORGANIC ELECTRONIC DEVICE
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The present invention discloses a bis-triphenylsilyl compound and its applications as a host material, electron transport material, or hole transport material in an organic electronic device. The general structure of the bis-triphenylsilyl compound is as follows: where G represents any atomic moiety or single bond of the functional group selected from the group consisting of the following: aryl group, cyclene group, and heterocyclic ring group; and R1?R32 represent substituents on aryl groups.
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Page/Page column 3
(2009/05/28)
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- Dendritic Ir(III) complexes functionalized with triphenylsilylphenyl groups: Synthesis, DFT calculation and comprehensive structure-property correlation
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We report on the synthesis, DFT calculations and structure-property relationships of phosphorescent Ir(iii) complexes with varied number and position of triphenylsilylphenyl substituents. The attachment of the dendritic triphenylsilylphenyl group at the pyridine part of the phenylpyridine ligand induced a stronger metal-to-ligand charge-transfer (MLCT) transition and lower band-gap energy than did the unfunctionalized complex, Ir(ppy)3. On the other hand, the attachment of the triphenylsilylphenyl group at the phenyl part of the phenylpyridine ligand induced a stronger ligand-centered (LC) transition. It was specifically found that the excited state intermolecular interactions, which give rise to non-radiative decay, were more efficiently suppressed when the triphenylsilylphenyl group was attached at the pyridine part of the phenylpyridine ligand and also when the number of substituents was increased. Such site-isolation effects and improved solubility due to the triphenylsilylphenyl group encapsulation made it possible to fabricate wet-processed polymer light-emitting devices from these functionalized Ir(iii) complexes. Both the doped poly(vinylcarbazole) (PVK) films and the neat films of our triphenylsilylphenyl based dendritic Ir(iii) complexes afforded moderate to high electrophosphorescence efficiencies with excellent phase homogeneity (4.1%/1.7% for Ir(TPSppy)3, 5.9%/2.5% for Ir(ppyTPS)3 and 1.8%/1.8% for Ir(TPSppyTPS)3 (doped polymer film/neat film, respectively)). Moreover, it is noteworthy that the triphenylsilylphenyl substituents greatly enhanced the thermal stability of the dendritic Ir(iii) complexes.
- Kim, Jae Jin,You, Youngmin,Park, Young-Seo,Kim, Jang-Joo,Park, Soo Young
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scheme or table
p. 8347 - 8359
(2011/07/07)
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- NAPHTHYL CARBAZOLE DERIVATIVES, KL HOST MATERIAL, THE ORGANIC LIGHT EMITTING DEVICE EMPLOYING THE SAME, THE DISPLAY DEVICE AND THE ILLUMINATION DEVICE EMPLOYING THE SAME
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Naphthylcarbazole derivatives are provided. The naphthylcarbazole derivatives are represented by Formula 1. Further provided are KL host materials, organic electroluminescent devices employing the host materials, and displays and lighting systems comprising the devices.
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Page/Page column 27-28
(2008/12/04)
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- Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes
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One of the important factors for high efficiency phosphorescent organic light-emitting devices is to confine triplet excitons within the emitting layer. We synthesized and characterized a new hole blocking material containing silane and triazine moieties, 2,4-diphenyl-6-(4′-triphenylsilanyl-biphenyl-4-yl) -1,3,5-triazine (DTBT). Electrophosphorescent devices fabricated using the material as the hole-blocking layer and N,N′-dicarbazolyl-4,4′- biphenyl (CBP) doped with fac-tris(2-phenylpyridine)iridium [Ir(ppy) 3] as the emitting layer showed a maximum external quantum efficiency (ηext) of 17.5% with a maximum power efficiency (ηp) of 47.8 lm W-1, which are much higher than those of devices using bathcuproine (BCP) (ηext = 14.5%, ηp = 40.0 lm W-1) and 4-biphenyloxolate aluminium(iii) bis(2-methyl-8-quinolinato)-4-phenylphenolate (BAlq) (ηext = 8.1%, ηp = 14.2 lm W-1) as hole-blocking layers. The Royal Society of Chemistry.
- Kang, Jae-Wook,Lee, Deug-Sang,Park, Hyung-Dol,Park, Young-Seo,Kim, Ji Whan,Jeong, Won-Ik,Yoo, Kyung-Mo,Go, Kyoungmoon,Kim, Se-Hoon,Kim, Jang-Joo
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p. 3714 - 3719
(2008/12/21)
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