- ORGANIC COMPOUNDS, ORGANIC LIGHT EMITTING DIODE AND ORGNIC LIGHT EMITTING DEVICE HAVING THE COMPOUNDS
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The present invention relates to an organic compound having an aromatic ring linked to a bipyridine moiety directly or through a linker in the bipyridine moiety. According to the present invention, the organic compound has a bipyridine moiety having excellent n-type characteristics, thereby minimizing exciton quenching by an interaction between a triplet exciton of a dopant and a peripheral hole-polarone. Accordingly, it is possible to prevent the lifespan of a light emitting diode element from being reduced by electro-oxidation and photo-oxidation. In addition, in the organic compound of the present invention, at least one of the bipyridine moiety and/or the aromatic ring is substituted with a cyano group, so that an energy band gap and an excited triplet energy level (T_1) are not deteriorated and luminous efficiency is thus improved. Therefore, the organic compound of the present invention can be used as a host of a light emitting material layer by being used with, for example, a delay fluorescent dopant emitting blue light. The organic compound of the present invention can be used in an organic light emitting diode and an organic light emitting device with improved luminous efficiency and especially element lifespan.COPYRIGHT KIPO 2019
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Paragraph 0143; 0147-0149
(2019/06/05)
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- ORGANIC COMPOUNDS, ORGANIC LIGHT EMITTING DIODE AND ORGNIC LIGHT EMITTING DEVICE HAVING THE COMPOUNDS
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The present invention relates to an organic compound having at least one aromatic ring connected to an indolocarbazole moiety directly or through a linker in the indolocarbazole moiety. According to the present invention, the organic compound has a firm structure by having an indolocarbazole moiety composed of five rings having a large steric hindrance with adjacent moieties. In addition, the organic compound of the present invention has a cyano group having excellent electron withdrawing characteristics in an indolocarbazole moiety and/or an adjacent aromatic ring, thereby having a wide band gap, no degradation in triplet energy, and high purity blueshift. The organic compound of the present invention can reduce a driving voltage of the light emitting element by applying the organic compound as a host to the light emitting element, and can improve luminous efficiency. In addition, the organic compound of the present invention can be applied to an organic light emitting diode capable of emitting blue light with high purity, an organic light emitting device, and the like.COPYRIGHT KIPO 2019
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Paragraph 0155; 0159-0161
(2019/06/13)
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- Organic electroluminescent material and application thereof
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The invention discloses an organic electroluminescent material and application thereof. The organic electroluminescent material is a compound with a structure shown as a formula I. The compound is a bipolar main body material with high efficiency and slow attenuation. Compared with almost small molecular materials recorded in the prior art, the compound m-BPySCz is slowly attenuated in a blue-light device and a green-light device under high brightness. Therefore, the organic electroluminescent material has a wide application prospect in preparation of electroluminescent devices. The formula Iis shown in the description.
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Paragraph 0034-0036
(2018/09/28)
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- Organic electro-luminescent compound and organic electro-luminescent device using same
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The invention provides an organic electro-luminescent compound and an organic electro-luminescent device using the same. The structural formula of the compound is as shown in formula I. The compound provided in the invention can be used as a hole injection layer material, a hole transfer layer material, a luminous layer material, an electron blocking layer material and a covering layer material, can lower drive voltage and improve efficiency, brightness, thermal stability, color purity and service life. Further, the organic electro-luminescent device manufactured with the organic compound hashigh efficiency and long service life.
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Paragraph 0129-0132
(2018/03/26)
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- 1, 2, 4-thiadiazole derivatives and their use as electroluminescent materials
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The invention relates to design and synthesis of organic electroluminescence materials which take 1,2,4-thiadiazole electronics transmission groups as a central unit as well as an application of the 1,2,4-thiadiazole electronics transmission groups on an organic electroluminescent device (OLED). The electroluminescent materials take 1,2,4-thiadiazole as a core, groups with different electronic or cavity transmission groups are bonded at positions 3 and 5 sites of 1,2,4-thiadiazole, carrier balance can be effectively solved, exciton recombination with high efficiency is radically realized, thus further combination of high efficiency light-emitting and energy level adjustment of the material can be realized. In addition, the energy level of the compound can be adjusted through an unsymmetrical structure, compared with the electronics transmission groups (such as oxadiazoles, 1,3,5-triazole) in the common main materials, the OLED devices has substantial effects in brightness, efficiency, glass transition temperature and the like, so that the material provided in the invention can be widely applied in the field of organic electroluminescence.
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Paragraph 0047
(2017/02/28)
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- Aromatic sulfone derivatives and Organic electroluminescent device comprising same
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The present invention relates to an organic material having an aromatic sulfonate derivative form and an organic electroluminescent device using the same. The organic electroluminescent device of the present invention can obtain short-wavelength light emitting in high efficiency and has improved lifespan properties.COPYRIGHT KIPO 2016
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Paragraph 0094-0100
(2016/10/17)
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- Bipolar host materials for high-efficiency blue phosphorescent and delayed-fluorescence OLEDs
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A series of small molecular isomers, namely o-CzCN, m-CzCN, and p-CzCN, are developed for use as bipolar hosts in blue phosphorescent and fluorescent organic light-emitting diodes (OLEDs). Cyano (CN) substituted phenyl is selected as the n-type unit and N-phenyl-substituted carbazole as the p-type unit. By adjusting the ortho-, meta-, and para-linking styles of the functional units, the physical parameters are regularly tuned to a large extent. The study of complete spatial separation of frontier molecular orbitals and single-carrier devices confirm the bipolar feature. Blue phosphorescent and thermally activated delayed fluorescence (TADF) OLEDs were fabricated using iridium(iii)bis(4,6-(difluorophenyl)pyridinato-N,C2′)picolinate (FIrpic) and 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN) as doped emitters. A maximum current efficiency of 46.81 cd A-1 and an external quantum efficiency of 23.14% were achieved for the phosphorescent OLED with the m-CzCN host. Furthermore, high efficiencies of 29.23 cd A-1 and 14.98% were obtained for the 2CzPN based blue TADF device with the o-CzCN host, which are higher than the best literature value of 13.6% for 2CzPN devices. Both m-CzCN and o-CzCN always perform better than p-CzCN. The influence of the chemical structures on their properties and performance is interpreted for these CN-decorated host materials.
- Li, Wei,Li, Jiuyan,Liu, Di,Wang, Fang,Zhang, Shufen
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supporting information
p. 12529 - 12538
(2015/12/18)
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- NEW DIBENZOFURANS AND DIBENZOTHIOPHENES
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The present invention relates to compounds of formula (I) which are characterized in that they are substituted by at least one nitrile substituted carbazolyl group and their use in electronic devices, especially electroluminescent devices. When used as el
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Page/Page column 104
(2015/11/11)
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- 9H-CARBAZOLE COMPOUNDS AND ELECTROLUMINESCENT DEVICES INVOLVING THEM
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The present invention relates to a novel organic luminescent compound and an organic electroluminescent device containing the same. The compounds according to the present invention have high luminous efficiency and long operation lifetime. Therefore, they can produce an organic electroluminescent device having an improved power consumption.
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- ORGANIC COMPOUND, CHARGE-TRANSPORTING MATERIAL, AND ORGANIC ELECTROLUMINESCENT ELEMENT
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An organic compound and a charge-transporting material which are excellent in both a hole-transporting property and an electron-transporting property and have excellent electrical oxidation/reduction durability and a high triplet excitation level are provided, and an organic electroluminescent device which uses this organic compound and has high luminous efficiency and high driving stability and long lifetime is provided. One molecule of the organic compound has two or more partial structures represented by the following Formula (I): wherein Cz denotes a carbazolyl group; Z denotes a direct link or an optional linking group; N atoms present in one molecule do not conjugate with each other excepting between N atoms in the same B1 rings; one molecule contains only one pyridine ring; one molecule contains a plurality of Q's; and Q denotes a direct link connected to G present in a moiety represented by the following Formula (II): wherein B1 ring is a six-membered aromatic heterocycle containing n N atoms as a hetero atom; n is an integer of 1 to 3; when G is linked to Q, the G denotes a direct link or an optional linking group which links to Q; when G is not linked to Q, the G denotes an aromatic hydrocarbon group; G's are bound to C atoms in ortho-position and para-position with respect to the N atom in B1 ring; and m is an integer of 3 to 5.
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Page/Page column 84; 85
(2008/06/13)
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