1060735-14-9Relevant academic research and scientific papers
Efficient blue/white phosphorescent organic light-emitting diodes based on a silicon-based host material via a direct carbon-nitrogen bond
Xie, Yue-Min,Cui, Lin-Song,Liu, Yuan,Zu, Feng-Shuo,Li, Qian,Jiang, Zuo-Quan,Liao, Liang-Sheng
, p. 5347 - 5353 (2015)
A new host material BCz-Si for blue and white phosphorescent organic light-emitting devices was designed and synthesized. The introduction of the triphenylsilyl moiety into the BCz unit can efficiently tune the HOMO/LUMO energy levels and maintain high triplet energy. Its carrier mobility, thermal, photophysical, and electrochemical properties were also systematically investigated. The high triplet energy of BCz-Si ensures efficient energy transfer from the host to the triplet emitter FIrpic. The blue device using BCz-Si as a host material achieved a maximum quantum efficiency of 21.0%, corresponding to a current efficiency and power efficiency as high as 46.5 cd A-1 and 45.8 lm W-1, respectively; meanwhile, high efficiency white phosphorescent OLEDs hosted by BCz-Si were also fabricated with a maximum external quantum efficiency of 24.6%, 70.5 cd A-1 for two-color based and 21.5%, 50.1 cd A-1 for three color based devices. This journal is
Constructing diazacarbazole-bicarbazole bipolar hybrids by optimizing the linker group for high efficiency, low roll off electrophosphorescent devices
Lv, Xialei,Wang, Bo,Tan, Jianghong,Huang, Zhi,Zhang, Qing,Xiang, Songpo,Liu, Wei,Zhuang, Shaoqing,Wang, Lei
, p. 54 - 62 (2017)
A series of novel bipolar host materials, 9-(4-(5H-pyrrolo [2,3-b:4,5-b′]dipyridin-5-yl)phenyl)-9′-phenyl-9H,9′H-3,3′-bicarbazole (NCzpPh2Cz), 9-(6-(5H-pyrrolo[2,3-b:4,5-b′]dipyridin-5-yl)pyridin-3-yl)-9′-phenyl-9H,9′H-3,3′-bicarbazole (NCzpPy2Cz) and 9-(6-(5H-pyrrolo[2,3-b:4,5-b′]dipyridin-5-yl)pyridin -2-yl)-9′-phenyl-9H,9′H-3,3′-bicarbazole (NCzmPy2Cz), employing the donor of 9-phenyl-9H,9′H-3,3′-bicarbazole and the acceptor of 1,5-diazacarbazole, have been designed and synthesized. By adjusting the linkers and linkage topologies, the thermal, photophysical, and electrochemical properties can be fine-tuned. All the three hosts showed excellent thermal stability with high Td (>420?°C) and high Tg (>148?°C). Among the three host materials, NCzmPy2Cz using a meta-substituted pyridine as the linker outperformed the other two hosts in blue devices. The device based on NCzmPy2Cz exhibited high efficiencies with a ηEQE,max of 20.0 %, ηC,max of 42.8?cd/A and ηP,max of 39.1?lm/W. More importantly, the efficiency roll-off of NCzmPy2Cz-based device was only 2 % even up to brightness of 1000?cd/m2. These results demonstrate that engineering the linker between the donor and acceptor could provide an efficient solution to design bipolar host materials for high efficiency, low roll-off blue PhOLEDs.
Blue thermally activated delayed fluorescent emitters having a bicarbazole donor moiety
Kim, Hyeong Min,Choi, Jeong Min,Lee, Jun Yeob
, p. 64133 - 64139 (2016)
Bis(4-(9′-phenyl-9H,9′H-[3,3′-bicarbazol]-9-yl)phenyl)methanone (BPBCz) and 9′,9′′′-((6-phenyl-1,3,5-triazine-2,4-diyl)bis(4,1-phenylene))bis(9-phenyl-9H,9′H-3,3′-bicarbazole) (TrzBCz) were investigated as thermally activated delayed fluorescent (TADF) emitters to exhibit blue emission color. A 3,3′-bicarbazole was a donor in the two TADF emitters, and benzophenone and triazine were acceptors of BPBCz and TrzBCz, respectively. Both BPBCz and TrzBCz behaved as high efficiency TADF emitters through a small singlet-triplet energy gap for the activation of delayed fluorescence. The BPBCz and TrzBCz TADF emitters offered high quantum efficiencies of 23.3% and 23.6% in the blue TADF devices.
A dicarbazole-triazine hybrid bipolar host material for highly efficient green phosphorescent OLEDs
Chang, Chih-Hao,Kuo, Ming-Cheng,Lin, Wei-Chieh,Chen, Yu-Ting,Wong, Ken-Tsung,Chou, Shu-Hua,Mondal, Ejabul,Kwong, Raymond C.,Xia, Sean,Nakagawa, Tetsuya,Adachi, Chihaya
, p. 3832 - 3838 (2012)
A novel bipolar host material 9-(4,6-diphenyl-1,3,5-triazin-2-yl)-9′- phenyl-3,3′-bicarbazole (CzT) comprising a dicarbazole donor linking to an electron deficient 1,3,5-triazine acceptor was synthesized and characterized. The molecular design of CzT allows the spatial separation of HOMO and LUMO on the donor and acceptor moieties, respectively, giving sufficient triplet energy (2.67 eV) together with promising physical properties and morphological stability (Tg = 134°C). This tailor-made material was used as a host for an efficient yellowish-green iridium complex, bis(o-tolylpyrimidinato- N,C2′)Ir(iii)acetylacetonate [(TPm)2Ir(acac)]; the as-fabricated phosphorescent OLEDs (PHOLEDs) demonstrated high performance, with maximum efficiencies of 20.0% (75.7 cd A-1 and 71.3 lm W -1) and 20.1% (76.3 cd A-1 and 72.7 lm W-1) achieved in trilayer and bilayer device architectures, respectively. The efficiency of the trilayer device can sustain ~20% over a wide brightness range from 102 to 103 cd m-2 due to the more effective confinement of emissive excitons within the emitting layer.
Organic compound and application thereof, and organic electroluminescent device
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Paragraph 0112-0114, (2020/02/14)
The invention relates to the field of organic electroluminescent devices, and discloses an organic compound and an application thereof, and an organic electroluminescent device; the compound has a structure represented by a formula (I) or a formula (II). According to the organic compound provided by the invention, the HOMO energy level and LUMO energy level of the organic electroluminescent material can be regulated and controlled, and meanwhile, the organic electroluminescent material containing the organic compound has relatively high hole mobility rate and electron mobility rate, so that the luminous efficiency is improved.
Boron-nitrogen heteropolyaromatic ring compound and application thereof
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Paragraph 0149-0153, (2020/08/29)
The invention relates to the technical field of display, in particular to a boron-nitrogen heteropolyaromatic ring compound and application thereof. The boron-nitrogen heteropolyaromatic ring compoundhas a structure as shown in a formula I, the compound is based on interaction between a boron-nitrogen structural unit and a surrounding aromatic ring or heteroaromatic ring. The boron-nitrogen heteropolyaromatic ring compound has higher glass transition temperature, higher and balanced charge mobility and more suitable single-triplet state energy, and when the boron-nitrogen heteropolyaromatic ring compound is used as a light-emitting main body material of an organic light-emitting device, the light-emitting efficiency of the device can be greatly improved, and the working voltage of the device is effectively reduced.
Novel compound and organic light emitting device comprising the same
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Paragraph 0148-0153, (2020/02/28)
The present invention provides a novel compound and an organic light emitting device using the same. The compound represented by the chemical formula 1 can be used as a material of an organic material layer of the organic light emitting device, and can improve efficiency, low driving voltage, and/or lifespan characteristics in the organic light emitting device.COPYRIGHT KIPO 2020
Novel compound and organic light emitting device comprising the same
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Paragraph 0200-0203, (2020/03/05)
The present invention provides a novel compound and an organic light emitting device comprising the same. A compound represented by chemical formula 1 can be used as a material of an organic material layer of the organic light emitting device, and can improve efficiency, low driving voltage, and/or lifespan characteristics in the organic light emitting device.COPYRIGHT KIPO 2020
COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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Paragraph 0186-0188, (2020/05/01)
The present specification provides a compound of chemical formula 1 and an organic light emitting device comprising the same. The compound according to an embodiment of the present application is used in the organic light emitting device to increase the brightness, increase lifespan, lower driving voltage, and improve light efficiency of the organic light emitting device, and also to improve lifespan characteristics of the device.COPYRIGHT KIPO 2020
Dendritic bipolar main body material taking triazine as central core, and preparation method and application of dendritic bipolar main body material in organic electroluminescent device
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Paragraph 0205; 0209, (2020/08/26)
The invention provides a compound with a structure represented by a formula (I) and a preparation method and application thereof. The compound with the structure represented by the formula (I) is a dendritic bipolar main body material taking triazine as a central core, the structure is different from a D-pi-A type structure of a traditional dendritic bipolar main body; the central core triazine isused as an electron acceptor (A), peripheral branches are used as electron donors (D), and a D-A type dendritic bipolar main body formed by direct connection of the donors and the acceptors maintainsa high triplet state energy level (2.8-3.3 eV), so that the application of the bipolar main body to a blue light OLED device is facilitated; it is found through experiments that the maximum current efficiency of a blue phosphorus photoluminescence device prepared with the compound as a main body material can reach 46.7 cd/A, the maximum power efficiency can reach 50.11 m/W, the maximum brightnesscan reach 32000 cd/m, and the turn-on voltage is 2.4 V.

