18628-07-4Relevant articles and documents
The effect of the electron-donor ability on the OLED efficiency of twisted donor-acceptor type emitters
Hong, Jong-In,Huh, Jin-Suk,Kim, Jae-Min,Kim, Jang-Joo,Yang, Dongwook
, (2021)
Two twisted donor-acceptor (D-A) chemical structures, CCDMB and PCDMB, were developed as a new class of thermally activated delayed fluorescence (TADF) emitters for organic light-emitting diodes (OLEDs). Two emitters consist of 3-substituted carbazole as a first donor and trivalent boron as an electron acceptor in common, and carbazole and phenoxazine as second donors with different electron donor ability. While PCDMB with a strong phenoxazine donor decreased the lowest singlet excited state (S1) level and thus showed a small singlet-triplet energy difference (ΔEST) value of 0.13 eV, resulting in effective reverse intersystem crossing (RISC), however, CCDMB with a weak donor showed a large ΔEST value of 0.21 eV. Efficient triplet harvesting of PCDMB was confirmed by a delayed component in transient PL decay curves of 25 wt% PCDMB-doped bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO) films. OLED devices with a CCDMB emitter showed deep-blue emission with Commission Internationale de l’éclairage (CIE) of (0.16, 0.12) but a low maximum EQE of 5.5%, indicative of insufficient triplet harvesting. PCDMB-based devices showed green emission with CIE of (0.21, 0.45) and a high maximum EQE of 22.3%. Our study revealed the effect of the electron donor ability of structurally similar emitters on ΔEST values, triplet harvesting, and device efficiency.
Compound for organic luminescence and application thereof
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, (2021/03/31)
The invention relates to a compound for organic luminescence, the structure of the compound is shown as a formula (I), and Ar1 is selected from an electron donating structural unit. The method for preparing the organic light-emitting compound is simple in process, easy to purify and high in yield; the organic electroluminescent material is used as a luminescent layer material to be applied to an organic electroluminescent device, and a manufactured device has long service life and can meet the requirements of panel manufacturing enterprises.
Compound for organic luminescence and application of compound
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Paragraph 0041; 0046-0047, (2021/06/22)
The invention relates to a compound for organic luminescence. The structure of the compound is shown as a formula (I), Ar1 and Ar2 are respectively and independently selected from hydrogen or an electron donating structural unit, but Ar1 and Ar2 are not hydrogen at the same time. The compound for organic luminescence is a thermally activated delayed fluorescent material with aggregation-induced emission property, is simple in process, easy to purify and high in yield, and can adjust the thermal property, luminescence property and the like of a final product by introducing different groups. When the material is applied to an organic electroluminescent device as a luminescent layer material, the manufactured device has long service life and can meet the requirements of panel manufacturing enterprises.
COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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Paragraph 0153-0155, (2021/02/02)
The present invention provides a compound represented by chemical formula 1 and an organic light emitting device comprising the same. The organic light emitting device including the compound has excellent electrochemical and thermal stability, and thus has excellent lifespan characteristics.
BENZIMIDAZOLE DERIVATIVE AND ORGANIC LIGHT EMITTING DEVICE COMPRISING SAME
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Paragraph 0057-0058; 0063-0064, (2020/08/01)
The present invention relates to a benzimidazole derivative and an organic electroluminescent device comprising the same, wherein a novel benzimidazole derivative of the present invention having the structure of chemical formula 1, has excellent luminous efficiency. Therefore, the organic electroluminescent device comprising the same has excellent brightness, color purity, and luminous efficiency, and also enables low voltage driving.
ORGANIC COMPOUND HAVING IMPROVED LUMINESCENT PROPERTIES, ORGANIC LIGHT EMITTING DIODE AND ORGANIC LIGHT EMITTING DEVICE HAVING THE COMPOUND
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Paragraph 0240; 0241, (2020/07/16)
An organic compound, an organic light emitting diode including the compound, and an organic light emitting device including the organic light emitting diode are disclosed. The organic compound may include a fused hetero aromatic moiety having a p-type property and an aza-acridine moiety having an n-type property bonded to the fused hetero aromatic moiety via an aromatic or a hetero aromatic linker. The organic compound has relatively high energy level since it includes plural fused hetero aromatic rings. Holes and electrons can be recombined in an emitting material layer in a balanced manner since the organic compound has a bipolar property. The organic light emitting diode and the organic light emitting device including the organic compound have enhanced luminous efficiency and luminous lifetime.
Heterocyclic compound with xanthone as core and preparation method and applications thereof
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Paragraph 0337-0338; 0341-0343, (2019/11/29)
The invention discloses a heterocyclic compound with xanthone as a core and a preparation method and applications thereof, and belongs to the technical field of semiconductors. The structure of the compound provided by the invention is represented by a general formula (I) shown in the description. The invention also discloses the preparation method and the applications of the compound. The compound of the invention has high glass transition temperature and molecular thermal stability and has a suitable HOMO and LUMO energy leves, has a singlet-triplet energy level difference ([delta]Est), andcan be used as a doping material of a light emitting layer of an organic electroluminescent device, thereby improving the luminous efficiency and service life of the device.
AROMATIC COMPOUND, ELECTROCHEMICAL DEVICE, ORGANIC ELECTROLUMINESCENCE ELEMENT
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Paragraph 0087; 0091; 0092, (2019/12/04)
PROBLEM TO BE SOLVED: To provide an aromatic compound effective especially as a host material of a luminous layer capable of realizing an electrochemical device such as an organic EL element with high luminous efficacy and low drive voltage. SOLUTION: An organic EL element 1 comprises a layered structure including a luminous layer 6 between a positive electrode 9 and a negative electrode 3, where the luminous layer 6 contains an aromatic compound represented by general formula (1). SELECTED DRAWING: Figure 1 COPYRIGHT: (C)2020,JPO&INPIT
Organic compound comprising boron and organic electroluminescent device comprising the same
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, (2019/12/03)
The present invention relates to an organic material comprising a boron atom and an organic electroluminescent device using the same. The organic electroluminescent device of the present invention can obtain light of short wavelengths with high efficiency and can lower the driving voltage.COPYRIGHT KIPO 2020
A benzhydryl radical based on the room temperature of the organic light-emitting material and using the material preparation of organic electroluminescent device
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Paragraph 0067; 0068; 0069, (2018/07/30)
A benzhydryl radical based on the stability of the organic light-emitting material at room temperature and using the material preparation of the organic electroluminescent device, which belongs to the field of organic light-emitting technology. The present invention in the preparation of the organic light-emitting material, the center of the common characteristic is the carbon free radical, is composed of two C - C covalent bond and a C - N to form a covalent bond. Stability is the light-emitting free radical material in the application of the key nature, connected to the electronic group conducive to stable free radical, in this invention through the nitrogen-containing heterocyclic carbazole, indole, dimethyl acridine and the like in the electronic group to the nitrogen atom is connected directly to the benzyl group, to obtain a stable benzhydryl radical, its stability and PTM, compared with the TTM is greatly improved, and has a room temperature fluorescent. The preparation of the material of the organic electroluminescent device using double thread condition exciton light-emitting, can avoid the traditional organic electroluminescent device in the use of the triplet state exciton, the maximum external quantum efficiency of the device is 0.66%.