852475-03-7Relevant academic research and scientific papers
Asymmetrically difunctionalized dibenzo[b,d]furan-based hole blocking materials for high-performance blue phosphorescent organic light-emitting diodes
Chung, Won Jae,Hong, Soojin,Jang, Seokhoon,Lee, Jun Yeob,Lee, Youngu,Yu, Gyeonghwa
, (2020/05/25)
Many researchers have reported dibenzo[b,d]furan segment as a building block of organic light-emitting diode (OLED) materials because it has high thermal stability and triplet energy. However, most of the research has focused on symmetrically substituting the same functional groups at 2-position due to easy functionalization or substituting the same functional groups at different positions of dibenzo[b,d]furan. Herein, we design and synthesize three new hole blocking materials based on asymmetrically difunctionalized dibenzo[b,d]furan, diphenyl (2-(pyridin-3-yl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Py), diphenyl(2-(pyrimidin-5-yl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Pyr), and diphenyl(2-(4-(triphenylsilyl)phenyl)dibenzo[b,d]furan-6-yl)phosphine oxide (DBFPO-Si) for high-performance phosphorescent OLEDs. Phosphine oxide, tetraphenylsilane, pyridine, and pyrimidine segments are successfully introduced into the asymmetric position of a dibenzo[b,d]furan. It is found that DBFPO-Py, DBFPO-Pyr, and DBFPO-Si possess high thermal stability; high triplet energies of 2.96, 2.98, and 2.80 eV; and deep highest occupied molecular orbital (HOMO) energy levels of ?7.13, ?7.23 and ?7.07 eV; respectively. Blue phosphorescent OLEDs with DBFPO-Py, DBFPO-Pyr, and DBFPO-Si show low turn-on voltages, high current and power efficiencies, and superior external quantum efficiencies. Blue phosphorescent OLEDs with DBFPO-Py and DBFPO-Pyr showed improved performance in terms of current and power efficiencies, etc, compared with the device with 1,3-bis(3,5-dipyrid-3-yl-phenyl)benzene (BmPyPB), which is commonly used as a hole blocking layer. More importantly, the blue phosphorescent OLEDs with DBFPO-Pyr showed the best performance with maximum external quantum efficiency of 23.6%, current efficiency of 29.8 cd A?1, power efficiency of 26.0 lm W?1, and low efficiency roll-off of 6.38%. Novel hole blocking materials based on asymmetrically difunctionalized dibenzo[b,d]furan are expected to make a significant contribution to the development of blue phosphorescent OLEDs.
An electroluminescent compound and an electroluminescent device comprising the same
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Paragraph 0380; 0385-0388; 0694; 0711-0714, (2020/09/26)
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].
Aromatic compound and organoelectro luminescent device comprising the compound
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Paragraph 0368; 0374-0378; 0791; 0804-0809, (2020/12/08)
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.
An electroluminescen compound and an electroluminescent device comprising the same
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Paragraph 0376-0380; 0634; 0639-0642, (2021/02/02)
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.
An organoelectro luminescent compounds and organoelectro luminescent device using the same
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Paragraph 0331; 0336-0339; 0455; 0460-0462, (2020/11/03)
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)
An organoelectro luminescent compounds and organoelectro luminescent device using the same
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Paragraph 0256; 0269-0272; 0452; 0457-0460, (2021/01/06)
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.
SILANE-GERMANE COMPOUND AND ORGANIC LIGHT EMITTING DIODE HAVING THE SAME
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Paragraph 0158; 0160-0163, (2017/04/13)
Disclosed in the present invention are a silane-germane compound and a light-emitting diode comprising the same. The silane-germane compound according to one embodiment of the present invention is represented by chemical formula 1, (B1)_3-M1-A-M2-(B2)_3. In the chemical formula 1, M1 and M2 are each independently silicon (Si) or germanium (Ge), and M1 and M2 are different from each other. Accordingly, the silane-germane compound shows high triplet energy (T1), a broad energy gap and a low HOMO value, and thus, when applied to an organic layer in light-emitting diodes, allows electron holes to move easily.(AA) Energy level (eV)COPYRIGHT KIPO 2017
Condensed-cyclic compound and organic light emitting device comprising the same
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Paragraph 0335-0338, (2016/10/10)
Including the same fused ring compound and is disclosure is an organic light emitting device. (by machine translation)
Highly thermally-stable 4,4′-bis(4″-triphenylsilylphenyl)-1,1′- binaphthalene as the ultraviolet amplified spontaneous emitter, efficient host and deep-blue emitting material
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
, p. 266 - 272 (2016/04/05)
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.
New pyridopyrazine skelecton-based electron-transporting materials
Kim, Ran,Oh, Dae Hwan,Hwang, Moon Chan,Baek, Jang Yeol,Shin, Sung Chul,Kwon, Soon-Ki,Kim, Yun-Hi
experimental part, p. 4370 - 4374 (2012/09/22)
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
