- Synthesis and electroluminescence properties of new dual-core derivatives
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New blue emitting materials based on dual core concept, TP-AF-TP and TP-HAF-TP were synthesized through boronylation and Suzuki coupling reactions. In the thin film state, TP-AF-TP and TP-HAF-TP exhibited maximum PL values at 445 and 440 nm, respectively. A non-doped OLED device based on TP-AF-TP and TP-HAF-TP showed current efficiency of 3.16 and 2.67 cd/A, respectively. TP-AF-TP exhibited a higher EL efficiency than that of TP-HAF-TP.
- Lee, Hayoon,Lee, Sunmi,Jung, Hyocheol,Kang, Seokwoo,Park, Jongwook
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- Electronic decoupling in ground and excited states of asymmetric biaryls
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New asymmetric biaryls have been synthesized in order to clarify the conditions necessary for charge-transfer transitions in photoexcited neutral compounds and biradical formation in doubly charged ground-state species. A parallel behavior for both types of approaches is observed and explained with a simple coupling model allowing prediction of the intermoiety coupling strength. It is shown that for weakly coupled biaryls the monoions are connected with charge localization and the dications and dianions form thermally excited biradicals while the fluorescence data indicate biradicaloid excited states connected with partial charge separation. More strongly coupled biaryls, on the other hand, result in diamagnetic species for the doubly charged ground-state ions, and a charge-transfer contribution in the fluorescence spectra of the neutral compound is absent.
- Baumgarten, Martin,Gherghel, Lileta,Friedrich, Jan,Jurczok, Martin,Rettig, Wolfgang
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- Efficient syntheses of C8-aryl adducts of adenine and guanine formed by reaction of radical cation metabolites of carcinogenic polycyclic aromatic hydrocarbons with DNA
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(Chemical Equation Presented) The synthesis of the C8-aryl adducts of adenine and guanine formed by reaction of the radical cation metabolites of carcinogenic polycyclic aromatic hydrocarbons (PAHs), such as benzo[a]pyrene (BP) and dibenzo[def,p]chrysene (DBC), with DNA is reported. The synthetic approach involves in the key step direct reaction of a PAH aldehyde with a di- or triamine precursor of a purine. The method is operationally simple, affords good yields of adducts, and is broad in its scope. The C 8-aryl adducts of adenine and guanine derived from BP (6-BP-8-Ade and 6-BP-8-Gua) and DBC (10-DBC-8-Ade and 10-DBC-8-Gua) were synthesized in good yields by this method. Analogous C8-aryl adenine and guanine derivatives of other PAHs (anthracene, benz[a]anthracene, and chrysene) were also readily prepared via this approach. This method of synthesis is superior to the only method mat is currently available. It entails direct reaction of short-lived PAH radical cations (generated electrochemically or chemically) with 2′-deoxyribonucleosides or the corresponding purine bases. It provides the adducts in low yields accompanied by complex mixtures of secondary products. An alternative synthesis that involves Pd-catalyzed Suzuki-Miyaura coupling of arylboronic acids with 8-bromopurine nucleosides was also investigated. Although the C8-purine adducts of PAHs, such as naphthalene, phenanthrene, pyrene, and chrysene, could be prepared by this method, analogous adducts of carcinogenic PAHs and other structurally related PAHs, e.g., anthracene, benz[a]anthracene, benzo[a]pyrene, and dibenzo[def,p]chrysene, could not be obtained. This difference was shown to be a consequence of the facility of competing hydrolytic deboronation of the corresponding arylboronic acids.
- Dai, Qing,Xu, Daiwang,Lim, Keunpoong,Harvey, Ronald G.
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- Complementary Lock-and-Key Ligand Binding of a Triplet Transmitter to a Nanocrystal Photosensitizer
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Owing to the difficulty in comprehensively characterizing nanocrystal (NC) surfaces, clear guidance for ligand design is lacking. In this work, a series of bidentate bis(pyridine) anthracene isomers (2,3-PyAn, 3,3-PyAn, 2,2-PyAn) that differ in their binding geometries were designed to find the best complementary fit to the NC surface. The efficiency of triplet energy transfer (TET) from the CdSe NC donor to a diphenylanthracene (DPA) acceptor mediated by these isomers was used as a proxy for the efficacy of orbital overlap and therefore ligand binding. 2,3-PyAn, with an intramolecular N–N distance of 8.2 ?, provided the best match to the surface of CdSe NCs. When serving as a transmitter for photon upconversion, 2,3-PyAn yielded the highest upconversion quantum yield (QY) of 12.1±1.3 %, followed by 3,3-PyAn and 2,2-PyAn. The TET quantum efficiencies determined by ultrafast transient absorption measurements showed the same trend.
- Li, Xin,Fast, Alexander,Huang, Zhiyuan,Fishman, Dmitry A.,Tang, Ming Lee
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- Aryl Radical Geometry Determines Nanographene Formation on Au(111)
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The Ullmann coupling has been used extensively as a synthetic tool for the formation of C?C bonds on surfaces. Thus far, most syntheses made use of aryl bromides or aryl iodides. We investigated the applicability of an aryl chloride in the bottom-up assembly of graphene nanoribbons. Specifically, the reactions of 10,10′-dichloro-9,9′-bianthryl (DCBA) on Au(111) were studied. Using atomic resolution non-contact AFM, the structure of various coupling products and intermediates were resolved, allowing us to reveal the important role of the geometry of the intermediate aryl radicals in the formation mechanism. For the aryl chloride, cyclodehydrogenation occurs before dehalogenation and polymerization. Due to their geometry, the planar bisanthene radicals display a different coupling behavior compared to the staggered bianthryl radicals formed when aryl bromides are used. This results in oligo- and polybisanthenes with predominantly fluoranthene-type connections.
- Jacobse, Peter H.,van den Hoogenband, Adri,Moret, Marc-Etienne,Klein Gebbink, Robertus J. M.,Swart, Ingmar
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- Excimer formation promoted by steric hindrance in dual core chromophore for organic light-emitting diodes emitters
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A new dual core derivative of 1-(3,5-dipyrid-3-yl-phenyl)-6-(10-(3,5-dipyrid-3-yl-phenyl)-anthracen-9-yl)-pyrene (3P-AP-3P) was synthesized by introducing pyridine groups. 1-[1,1';3',1"]Terphenyl-5'-yl-6-(10-[1,1';3',1"]terphenyl-5'-yl-anthracen-9-yl)-pyrene (TP-AP-TP) was used to compare with 3P-AP-3P. Unlike TP-AP-TP, 3P-AP-3P exhibited an excimer emission at 602 nm by introducing pyridine groups despite its highly twisted core. Two materials were used as emitting layer (EML) in OLED devices: ITO/2-TNATA (60 nm)/NPB (15 nm)/the synthesized materials (35 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (200 nm). The 3P-AP-3P device exhibited EL maximum values at 463 nm and 601 nm.
- Lee, Jaehyun,Kim, Beomjin,Park, Jongwook
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- Supramolecular structures and spontaneous resolution: The case of ortho-substituted phenylboronic acids
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The solid state structures of a number of ortho-substituted arylboronic acids, ortho-bromophenyl, ortho-phenylphenyl, pentamethylphenyl, and 10-bromo-9-anthryl, were determined by X-ray diffraction techniques. All boronic acids investigated form dimers in the solid state, but the interconnection of dimers to ribbons differs from that of the parent phenylboronic acid. Pentamethylphenylboronic acid only uses one hydrogen bond but an additional OH-π interaction for connection of dimers, while all others investigated employ two hydrogen bonds for interconnection of dimers to ribbons. 10-Bromo-9-anthrylboronic acid is found to undergo spontaneous resolution of its enantiomers to a racemic conglomerate upon crystallization. The Royal Society of Chemistry.
- Filthaus, Matthias,Oppel, Iris M.,Bettinger, Holger F.
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- Synthesis and luminescent property of Poly(9-(3-vinyl-phenyl)-anthracene)
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Polymer light-emitting diodes (PLEDs) have attracted much attention from academia and industry field because of their various applications such as large area flat-panel displays and lightings. In this paper, we suggest new blue emitting polymer based on a
- Lee, Sunmi,Shin, Hwangyu,Park, Beom-Soo Michael,Lee, Jaehyun,Park, Jongwook
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- New Emitting Materials Based on HTL Moiety with High Hole Mobility for OLEDs
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New green emitting compounds based on tris(N-methylindolo)benzene (NMT), anthracene and pyrene were synthesized. NMT-An and NMT-Py were used as an emitting layer in OLED device to examine emitting property. OLED device containing NMT-An emitting layer and conventional hole transporting layer (HTL) of NPB was found to exhibit better characteristics compared to NMT-Py. And that device showed maximum EL emission at 502 nm and 550 nm, CIE coordinates (0.38, 0.48), and a luminance efficiency of 2.06 cd/A. Also when NMT and NMT-An were used as a HTL instead of NPB, the device including NMT-An emitter showed 2.67 cd/A and 2.29 cd/A in luminance efficiency.
- Kang, Hyeonmi,Lee, Hayoon,Shin, Hwangyu,Kang, Seokwoo,Kim, Beomjin,Park, Jongwook
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- Electrode comprising organic semiconductor material, method for manufacturing electrode, and supercapacitor comprising electrode
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The present invention relates to: an electrode comprising a current collector and a film located on the current collector, wherein the film comprises an organic semiconductor material and one selected from a carbon material, a metal oxide and a conductive polymer; a method for manufacturing the electrode; and a supercapacitor comprising the electrode.
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(2019/06/10)
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- Phenanthridine Derivatives and organic light-emitting diode including the same
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PURPOSE: A phenanthridine derivative compound is provided to obatin an organic light emitting diode with excellent light emitting property. CONSTITUTION: A phenanthridine derivative compound is denoted by chemical formula 1 or 2. An organic light emitting diode contains an anode, a cathode, and the phenanthridine derivative compounds inserted between the anode and cathode. The organic light emitting diode further contains a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, or an electron injection layer formed by monomer deposition or solution process.
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Paragraph 0224; 0225-0227
(2019/11/23)
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- Semiconducting Material Comprising a Phosphine Oxide Matrix and Metal Salt
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The present invention is directed to a semiconducting material comprising: i) a compound according to formula (I) wherein R1, R2 and R3 are independently selected from C1-C30-alkyl, C3-C30 cycloalkyl, C2-C30-heteroalkyl, C6-C30-aryl, C2-C30-heteroaryl, C1-C30-alkoxy, C3-C30-cycloalkyloxy, C6-C30 aryloxy, and from structural unit having general formula E-A-, wherein—A is a C6-C30 phenylene spacer unit, and—E is an electron transporting unit that is selected from C10-C60 aryl and C6-C60 heteroaryl comprising up to 6 heteroatoms independently selected from O, S, P, Si and B and that comprises a conjugated system of at least 10 delocalized electrons, and—at least one group selected from R1, R2 and R3 has the general formula E-A-; and ii) at least one complex of a monovalent metal having formula (II) wherein—M+ is a positive metal ion bearing a single elementary charge, and each of A1, A2, A3 and A4 is independently selected from H, substituted or unsubstituted C6-C20 aryl and substituted or unsubstituted C2-C20 heteroaryl, wherein a heteroaryl ring of at least 5 ring-forming atoms of the substituted or unsubstituted C2-C20 heteroaryl comprises at least one hetero atom selected from O, S and N.
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- Novel supercapacitor materials including OLED emitters
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This study constitutes the first attempt to use an OLED emitter material as a novel supercapacitor component. In supercapacitor tests, the specific capacitance (33.07 F g-1) of a poly(9-(3-vinyl-phenyl)-anthracene) (PVPA)/multi-walled carbon nanotube (MWCNT) mixture was found to be approximately three times that of the system composed of the MWCNTs alone.
- Kim, Seungho,Jang, Kihun,Park, Beom-Soo Michael,Ahn, Heejoon,Ko, Jang Myoun,Park, Jongwook
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supporting information
p. 58 - 62
(2016/01/12)
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- COMPOUNDS FOR ORGANIC OPTOELECTRONIC DEVICE AND ORGANIC OPTOELECTRONIC DEVICE INCLUDING THE SAME
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Provided are a compound for an organic optoelectronic device represented by chemical formula 1, and an organic optoelectronic device comprising the same. In chemical formula 1, each of Ar^1 and Ar^2 is independently a substituted or unsubstituted C6 to C20 aryl group, or Ar^1 and Ar^2 are linked to form an N-containing heterocycle. Each of Ar^3 and Ar^4 is independently a substituted or unsubstituted C6 to C20 aryl group, and R is a C6 to C30 arylene group or a C6 to C30 arylene group substituted by a C1 to C10 alkyl group.COPYRIGHT KIPO 2016
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Paragraph 0103-0107
(2017/01/05)
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- Excimer emission based on the control of molecular structure and intermolecular interactions
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Three triple-core chromophore derivatives based on anthracene and pyrene or chrysene moieties, 1,6-bis-(10-[1,1′;3′,1′′]terphenyl-5′-yl-anthracen-9-yl)-pyrene (1,6 DAP-TP), 6,12-bis-(10-[1,1′;3′,1′′]terphenyl-5′-yl-anthracen-9-yl)-chrysene (DAC-TP), and 2,7-bis-(10-[1,1′;3′,1′′]terphenyl-5′-yl-anthracen-9-yl)-pyrene (2,7 DAP-TP), were designed and synthesized. For 1,6 DAP-TP, anthracene was attached to the 1,6 positions of pyrene. In the case of DAC-TP, two anthracenes were connected to chrysene, located at the center position within the core, whereas in 2,7 DAP-TP anthracene was connected to the 2,7 positions of pyrene. All three materials had highly twisted core structures and bulky m-terphenyl side groups introduced into the core. Excimer emission was observed in the solid film state and can be interpreted as the result of anisotropic intermolecular alignment (orientation effect). The wavelength of excimer formation was controlled through the change of the center position of the triple-core chromophore, and the color coordinate of white light and efficiency could be controlled when the materials were used in an electroluminescence (EL) device. Excimer EL emissions of 1,6 DAP-TP, DAC-TP, and 2,7 DAP-TP were at 591 nm, 556 nm, and 538 nm, respectively, and CIE coordinate values of the devices were (0.37, 0.31), (0.30, 0.37), and (0.32, 0.44), respectively, showing single molecular white emission. 2,7 DAP-TP showed a white OLED efficiency of 6.01 cd A-1 at 10 mA cm-2.
- Lee, Jaehyun,Jung, Hyocheol,Shin, Hwangyu,Kim, Joonghan,Yokoyama, Daisuke,Nishimura, Hidetaka,Wakamiya, Atsushi,Park, Jongwook
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p. 2784 - 2792
(2016/04/26)
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- Synthesis and electroluminescence properties of highly efficient dual core chromophores with side groups for blue emission
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Highly efficient blue emitting materials consisting of dual core derivatives with phenyl and/or naphthyl side groups and asymmetric or symmetric structures were designed and synthesized. The asymmetric structures 1-naphthalen-1-yl-6-(10-phenyl-anthracen-9-yl)-pyrene (Ph-AP-Na) and 1-(10-naphthalen-1-yl-anthracen-9-yl)-6-phenyl-pyrene (Na-AP-Ph), and the symmetric structures 1-phenyl-6-(10-phenyl-anthracen-9-yl)-pyrene (Ph-AP-Ph) and 1-naphthalen-1-yl-6-(10-naphthalen-1-yl-anthracen-9-yl)-pyrene (Na-AP-Na) were synthesized. Of the synthesized compounds, Na-AP-Na was found to exhibit the highest EL device efficiency of 5.46 cd A-1. Ph-AP-Na, Na-AP-Ph, Ph-AP-Ph, and Na-AP-Na exhibit EL maximum values of real blue color in the range 455 nm to 463 nm. The y values of their color coordinates are within the range 0.125 to 0.142, so these compounds exhibit good blue color coordinates for displays. The lifetime of the Na-AP-Na device was more than three times longer than that of the AP dual core (1-anthracen-9-yl-pyrene) device. This journal is the Partner Organisations 2014.
- Lee, Hayoon,Kim, Beomjin,Kim, Seungho,Kim, Joonghan,Lee, Jaehyun,Shin, Hwangyu,Lee, Ji-Hoon,Park, Jongwook
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p. 4737 - 4747
(2014/06/23)
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- ON-OFF luminescence signaling of hybrid organic-inorganic switches
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The dyads 1OFF and 2OFF were prepared by combining the inorganic luminophores [Ru(phen)2(2-[imidazol-2-yl]pyridine)] 2+ and [Re(CO)3Cl(2-[imidazol-2-yl]pyridine)] with 2-(anthracen-9-yl)-4-methylphenol as a second photoactive moiety. In both cases, the inorganic unit operates as the emitter, whereas the organic part acts as a controller. Emission of the inorganic luminophore can be reversibly switched ON and OFF by adjusting the energetic level of the 3π-π* state of the appended anthracene unit through either dearomatization using a photohydration or aromatization applying a thermal dehydration. Emission of both switches is reversibly recorded and erased multiple times without significant degradation.
- Natarajan, Palani,Schmittel, Michael
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p. 8579 - 8590
(2013/09/02)
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- Vaulted biaryls in catalysis: A structure-activity relationship guided tour of the immanent domain of the VANOL ligand
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The active site in the BOROX catalyst is a chiral polyborate anion (boroxinate) that is assembled in situ from three equivalents of B(OPh) 3 and one of the VANOL ligand by a molecule of substrate. The substrates are bound to the boroxinate by Hbonds to oxygen atoms O1-O3. The effects of introducing substituents at each position of the naphthalene core of the VANOL ligand are systematically investigated in an aziridination reaction. Substituents in the 4,4′- and 8,8′-positions have a negative effect on catalyst performance, whereas, substituents in the 7- and 7′-positions have the biggest impact in a positive direction. VANOL destination: The active site in the BOROX catalyst is a chiral polyborate anion (boroxinate; see figure) that is assembled in situ from three equivalents of B(OPh)3 and one of the VANOL ligand by a molecule of substrate. The effects of introducing substituents at each position of the naphthalene core of the VANOL ligand are systematically investigated in an aziridination reaction. Copyright
- Guan, Yong,Ding, Zhensheng,Wulff, William D.
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p. 15565 - 15571
(2013/11/19)
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- Bipolar anthracene derivatives containing hole- and electron-transporting moieties for highly efficient blue electroluminescence devices
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A series of bipolar anthracene derivatives containing hole-transporting triphenylamine and electron-transporting benzimidazole moieties were synthesized and characterized. These compounds possess high thermal properties and quantum yield in toluene solution but their photoluminescence spectra are sensitive to the polarity of the solvent. Three types of devices were fabricated to investigate their electron-transporting and hole-transporting as well as light-emitting properties. The electroluminescence spectra for the three derivatives B1, B3 and B4 show that they emit blue light, while the B2-based devices produced white light at a low current density because of the electromer formation. Moreover, a single layer OLED device for B4 exhibited a current efficiency of 3.33 cd A-1 with a pure blue color of CIE (x,y) of (0.16, 0.16) at 20 mA cm-2 and a maximum brightness of 8472 cd m-2 at 8.7 V. The Royal Society of Chemistry 2011.
- Huang, Jinhai,Su, Jian-Hua,Li, Xin,Lam, Mei-Ki,Fung, Ka-Man,Fan, Hai-Hua,Cheah, Kok-Wai,Chen, Chin H.,Tian, He
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experimental part
p. 2957 - 2964
(2011/10/04)
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- ELECTROLUMINESCENT COMPOUNDS WITH HIGH EFFICIENCY AND ORGANIC LIGHT-EMITTING DIODE USING THE SAME
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The present invention relates to novel organic electroluminescent compounds and an organic light-emitting diode comprising the same. The organic electroluminescent compounds according to the present invention exhibit high luminous efficiency and excellent life property as a material, so that an OLED device having very good operation life can be prepared therefrom.
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Page/Page column 12
(2011/07/06)
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- Oxadiazole Derivative, and Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device Using Oxadiazole Derivative
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An object is to provide a novel oxadiazole derivative represented by General Formula (G1) as a substance having a high electron-transport property. In the formula, Ar1 represents a substituted or unsubstituted aryl group having 6 to 10 carbon atoms in a ring. When Ar1 has a substituent, the substituent is an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms in a ring. Ar2 represents a substituted or unsubstituted aryl group having 6 to 10 carbon atoms in a ring or a substituted or unsubstituted heteroaryl group having 4 to 9 carbon atoms. When Ar2 has a substituent, the substituent is an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms in a ring. R1 and R2 independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
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- THIAZOLE SYSTEM ORGANIC ELECTROLUMINESCENT COMPOUNDS AND ORGANIC LIGHT EMITTING DIODE USING THE SAME
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The present invention relates to novel thiazole system organic electroluminescent compounds and organic light emitting diodes comprising the same. Since the thiazole system organic electroluminescent compounds according to the invention have good luminous efficiency and life property, OLED's having very good operation lifetime can be produced.
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Page/Page column 23
(2010/08/07)
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- Switchable trans-cis interconversion of an amphiphilic anthracene trimer
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Three anthracene rings connected by m-phenylene spacers with hydroxy groups generate isolable trans- and cis-atropisomers whose interconversion is solvent sensitive and can be activated at room temperature by an external stimulus (base).
- Iwasa, Junji,Ono, Kosuke,Fujita, Makoto,Akita, Munetaka,Yoshizawa, Michito
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supporting information; experimental part
p. 5746 - 5748
(2010/01/31)
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- Benzoxazole Derivative, and Light-Emitting Element, Light-Emitting Device, and Electronic Device Using the Same
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An object is to provide a novel benzoxazole derivative. Another object is to reduce driving voltage of a light-emitting element. Still another object is to reduce power consumption of a light-emitting element, a light-emitting device, and an electronic device. A benzoxazole derivative represented by General Formula (G1) is provided. The benzoxazole derivative represented by General Formula (G1) has an electron-injecting property and an electron-transporting property; accordingly, it can be favorably used for a light-emitting element, a light-emitting device, and an electronic device.
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Page/Page column 65
(2009/12/05)
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- Exceedingly efficient deep-blue electroluminescence from new anthracenes obtained using rational molecular design
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9,10-Bis(3′,5′-diphenylphenyl)anthracene [MAM], 9-(3′,5′-diphenylphenyl)-10-(3?,5?-diphenylbiphenyl- 4″-yl)anthracene [MAT], and 9,10-bis(3″,5″-diphenylbiphenyl- 4′-yl)anthracene [TAT] were newly synthesized through boration and Suzuki aryl-aryl coupling
- Kim, Soo-Kang,Yang, Bing,Ma, Yuguang,Lee, Ji-Hoon,Park, Jong-Wook
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experimental part
p. 3376 - 3384
(2010/02/28)
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- Anthracene effects on organic light emitting diode performance of tetra-substituted ethylene derivatives
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We synthesized new bluish-green and sky-blue emitting materials, 1,1,2,2-tetrakis(4'-tert-butylbiphenyl)ethane[TBBPE] and 1,1,2,2-tetrakis(4- (anthracen-9-yl)phenyl)ethene[TAPE]. TBBPE and TAPE film showed PL maximum value of 511nm and 492nm. TBBPE OLED device showed bluish-green C.I.E. value of (0.236, 0.412) and high luminance efficiency of 5.02cd/A at 10mA/cm2. TAPE device also showed sky-blue C.I.E. value of (0.213, 0.323) and 3.17cd/A at 10mA/cm2. It is found that TBBPE shows better luminance efficiency than TAPE and TAPE device exhibits relatively lower operating voltage and better C.I.E. value than TBBPE device.
- Kim, Soo-Kang,Park, Jong-Wook,Oh, Se-Young
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- ASYMMETRIC MONOANTHRACENE DERIVATIVE, MATERIAL FOR ORGANIC ELECTROLUMINESCENT DEVICE AND ORGANIC ELECTROLUMINESCENT DEVICE UTILIZING THE SAME
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Provided are an asymmetric monoanthracene derivative having a specific structure, a material for an organic EL device comprising the above asymmetric monoanthracene derivative and an organic EL device in which an organic thin film layer comprising a single layer or plural layers including a luminescent layer is interposed between a cathode and an anode, wherein at least one of the above organic thin film layers contains the asymmetric monoanthracene derivative described above in the form of a single component or a mixed component. Provided are an organic electroluminescent (EL) device having a high luminous efficiency and a long life, an asymmetric monoanthracene derivative which materializes the same and a material for an organic EL device.
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Page/Page column 34
(2008/06/13)
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- PHENOL-HETEROCYCLIC LIGANDS, METAL COMPLEXES, AND THEIR USES AS CATALYSTS
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Ligands, compositions, and metal-ligand complexes that incorporate phenol-heterocyclic compounds are disclosed that are useful in the catalysis of transformations such as the polymerization of monomers into polymers. The catalysts have high performance characteristics, including high comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, propylene or styrene. The catalysts particularly polymerize styrene to form polystyrene.
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Page/Page column 76-77
(2010/11/08)
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- SMALL MOLECULE GLYCOSAMINOGLYCAN MIMETICS
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A compound of formula I wherein R, Rl, R2, R3 and R4 are as defined herein, B is a single or double bond, X is O, S, N or a bond, Y is independently O or a bond, With the proviso that the compound bears one charged group.
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Page/Page column 30
(2010/11/25)
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- Synthesis and Functional Properties of Strongly Luminescent Diphenylamino End-Capped Oligophenylenes
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Two novel homologous series of oligophenylenes (OPPs) symmetrically end-capped with diphenylamino groups and asymmetrically end-capped with anthryldiphenylamino groups were successfully synthesized by a convergent approach with use of palladium-catalyzed homo- and cross-coupling of arylboronic acids. The absorption maxima of both diphenylamino end-capped OPP series do not vary with the chain length although the molar absorptivities increase sequentially. On the other hand, the emission maxima slightly shift to longer wavelengths when the phenylene unit increases in the series. All the diphenylamino end-capped oligomers exhibit very large fluorescence quantum yields (81-89%). They also exhibit low first ionization potentials, corresponding to the oxidation of the triarylamino moiety, which are essentially unaffected by the oligomeric length extension. The good thermal stabilities of these oligomers allowed the fabrication of multilayer light-emitting devices and their investigations.
- Li, Zhong Hui,Wong, Man Shing,Tao, Ye,D'Iorio, Marie
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p. 921 - 927
(2007/10/03)
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- Anthracene - BODIPY cassettes: Syntheses and energy transfer
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Compounds based on the 4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (BODIPY) framework are excellent fluorescent markers. When BODIPY dyes of this type are conjugated to functionalities that absorb at relatively short wave-lengths, those functionalities can, in some molecules, transmit the absorbed energy to the BODIPY which then fluoresces. In such cases the BODIPY fragment acts as an acceptor while the other group serves as a donor. Energy transfer efficiencies in such donor-acceptor cassette systems must vary with the relative orientation of the two components, and with the structure of the linkers that attach them. This study was designed to probe these issues for the special case in which the linkers between the donor and acceptor fragments are conjugated. To do this, the cassettes 3-10 were prepared. Electrochemical studies were performed to provide insight into the degree of donor -acceptor conjugation in these systems. X-ray Crystallographic studies on single crystals of compounds 7 and 9 revealed the favored conformations of the donor and acceptor fragments in the solid state. Absorption, fluorescence, and time-resolved fluorescence spectra of the compounds were recorded, and quantum yields for the cassettes excited at the donor λmax were measured. Fluorescence steady-state anisotropy data were determined for cassettes 3 and 9 to provide information about the mutual direction of the transition dipole moments.
- Wan, Chi-Wai,Burghart, Armin,Chen, Jiong,Bergstroem, Fredrik,Johansson, Lennart B.-A.,Wolford, Matthew F.,Kim, Taeg Gyum,Topp, Michael R.,Hochstrasser, Robin M.,Burgess, Kevin
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p. 4430 - 4441
(2007/10/03)
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- Substituted phenyl farnesyltransferase inhibitors
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Compounds of formula (I) or pharmaceutically acceptable salts thereof, inhibit farnesyltransferase. Methods for making the compounds, pharmaceutical compositions containing the compounds, and methods of treatment using the compounds are disclosed.
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