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Hyocheol Jung,Hwangyu Shin,Siin Kim,Joonghan Kim,Byeong-Kwan An,Jihoon Lee,Hyotcherl Ihee,Jongwook Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
Three bipolar materials, 4-(4,6-diphenyl-1,3,5-triazin-2-yl)-N,N-diphenylaniline (DPAT-Ph), 4-(4,6-diphenyl-1,3,5-triazin-2-yl)-N,N-diphenylnaphthalen-1-amine (DPAT-Na), and 10-(4,6-diphenyl-1,3,5-triazin-2-yl)-N,N-diphenylanthracen-9-amine (DPAT-An), were designed and synthesized. Toachieve a bipolar character, diphenylamine (DPA) moiety and 2,4-diphenyl-1,3,5-triazine (DPT) moietywere introduced as electron donating and electron accepting groups, respectively. The three compoundsexhibited UV maximum wavelengths (UVmax) at 395–454 nm and photoluminescence maximumwavelengths (PLmax) at 472–546 nm. 10-(4,6-Diphenyl-1,3,5-triazin-2-yl)-N,N-diphenylanthracen-9-amine (DPAT-An) shows AIE phenomenon even though DPAT-An does not have tetraphenylethylene(TPE) moiety which is representative AIE structure. DPAT-An exhibits over EQE value of 5% and longdevice lifetime of 1310 h without sublimation process.
강효철(Hyocheol Kang),나선채(Seonchae Na),최병용(Byungyong Choi),김지현(Jihyun Kim),조한결(Hankyeol Cho),유소영(Soyoung Yoo),이종탁(Jongtak Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The demand of car increases steadily in developing country(India, China, Brazil). Hyundai Motor Company makes every possible effort, for example adjusting upward the number of Car Manufacture for gaining share sales in developing country. For gaining cost competitiveness improvement, seat frame of previous version is applied in the automobile which is exported to developing country. But it doesn’t have enough weight competitiveness than rival car’s seat. Because of this reason, we must develop seat frame of new version which has light weight and enough strength.
Jung, Hyocheol,Kong, Nam Sik,Kim, Beomjin,Lee, Kyu Cheol,Kim, Soon Cheon,Lee, Chan Kyu,Kong, Hoyoul,Jun, Kun,Kim, Jin Chul,Noh, Seung Man,Cheong, In Woo,Park, Jongwook,Park, Young IL Elsevier 2018 Dyes and pigments Vol.149 No.-
<P><B>Abstract</B></P> <P>A new dimeric triarylmethine-based dye, Ac-BTM-DHFMS, substituted with methacrylate groups, was designed and synthesized to improve thermal and chemical stability by using polymerisation of the acrylate cross-linking group. To evaluate the dye in color filter applications, filters were fabricated and evaluated after heat treatment at 230 °C for 1 h, and solvent stability was evaluated after dipping filters for 10 min in isopropyl alcohol (IPA), propylene glycol monomethyl ether acetate (PGMEA), and cyclohexanone. During the thermal stability test, Ac-BTM-DHFMS showed a ΔE<SUB>ab</SUB> value of 4.21. In the solvent stability test, Ac-BTM-DHFMS showed ΔE<SUB>ab</SUB> values of 1.0 (IPA), 0.3 (PGMEA), and 0.7 (cyclohexanone), respectively. These ΔE<SUB>ab</SUB> values of color filter mean that Ac-BTM-DHFMS is thermally and chemically more stable than H-BTM-DHFMS without the methacrylate groups. These results show that Ac-BTM-DHFMS has potential for application as a color filter for blue dyes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ac-BTM-DHFMS substituted with methacrylate groups has been designed and synthesized as potential color filter dyes. </LI> <LI> Ac-BTM-DHFMS showed improved solubility due to twisted molecular structure and bulky methacrylate groups. </LI> <LI> Cross-linkable group of Ac-BTM-DHFMS make be improved thermal/chemical stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Bae, Hyocheol,Lim, Whasun,Bae, Seung-Min,Bazer, Fuller W,Choi, Youngsok,Song, Gwonhwa Society for the Study of Reproduction [etc.] 2014 BIOLOGY OF REPRODUCTION Vol.91 No.1
<P>Prostatic acid phosphatase (ACPP) is a glycoprotein that is mainly synthesized and secreted by glandular epithelial cells (GE) of the prostate, and it is well known as a biomarker for prostate cancer. Although ACPP was used as prognostic/diagnostic indicator and studied to elucidate regulatory mechanism(s) during several decades in humans, its role is not clearly understood. Gene profiling data using a chicken DNA microarray revealed that ACPP increased significantly during remodeling and recrudescence of the oviduct in response to estrogen. Thus, in this study, we investigated the expression and hormonal regulation of ACPP gene in the reproductive tracts of chickens. ACPP was specifically detected in the luminal cells (LE) and GE of chicken oviduct, and diethylstilbestrol (a synthetic nonsteroidal estrogen) stimulated its expression during development of the oviduct. In addition, ACPP mRNA and protein were localized to LE and GE during the regeneration phase of the oviduct of laying hens during induced molting. Furthermore, ACPP mRNA and protein were abundant in GE of ovarian carcinoma, but not in normal ovaries. Moreover, strong expression of ACPP protein was detected in epithelial cells of cancerous ovaries from women. Collectively, results of the present study are the first to show that ACPP is a novel estrogen-stimulated gene in the oviductal epithelial cells of the chicken and that its expression increases significantly in epithelial cells of ovarian carcinoma, which indicates that it may be a candidate biomarker for diagnosis of epithelia-derived ovarian cancer in women.</P>
정효철 ( Hyocheol Jung ),이하윤 ( Hayoon Lee ),강석우 ( Seokwoo Kang ),안병관 ( Byeong-kwan An ),육경수 ( Kyoung Soo Yook ),박영일 ( Young-il Park ),김범진 ( Beomjin Kim ),박종욱 ( Jongwook Park ) 한국공업화학회 2016 공업화학 Vol.27 No.5
유기 발광 다이오드(OLED)는 학문 및 산업분야에서 많은 관심을 받고 있다. OLED는 이미 휴대폰과 TV분야에서 상업화에 성공하고 있으며, 조명분야에서는 기존에 사용되어왔던 백열등, 형광등과는 다르게 면발광, 대면적, 초경량, 초박형, 유연성의 특징은 물론 낮은 에너지 사용 등의 차별성을 가지고 있기 때문에 최근 많은 관심을 받고 있다. 본 논문에서는 white organic light-emitting diode (WOLED)에 적용되는 대표적인 형광 및 인광 발광 재료들을 소개한다. 이렇게 선행 연구된 물질들을 이해하고 체계적으로 분류하는 것은 앞으로 새로운 발광 재료를 연구, 개발하는데 큰 도움을 줄 수 있을 것으로 기대된다. Organic light-emitting diode (OLED) has drawn a lot of attention in academic and industrial fields, which has been successfully commercialized in mobile phones and TV’s. In the field of lighting, unlike the existing incandescent or fluorescent lighting, OLED has distinctive qualities such as surface lighting-emission, large-area, lightweight, ultrathin, flexibility in addition to low energy use. This article introduces prominent fluorescent, phosphorescent, and luminescent materials applied to white OLED (WOLED). The understanding and systematic classification of previously studied substances are expected to be greatly helpful for the development of new luminous materials in future.
Jung, Hyocheol,Kang, Seokwoo,Sim, Yeonhee,Jung, Mina,Wakamiya, Atsushi,Lee, Ji-Hoon,Park, Jongwook Elsevier 2019 Organic electronics Vol.73 No.-
<P><B>Abstract</B></P> <P>The relationship between the single crystal structure of materials and the EL performance of doped OLED devices was investigated. The 1,6-bis-(10-[1,1′;3′,1″]terphenyl-5′-yl-anthracen-9-yl)-pyrene (1,6 DAP-TP) has a dihedral angle (α) of 78.4° and a dihedral angle (β) of 81.2°, a relatively more twisted single crystal structure compared to that of 6,12-bis-(10-[1,1′;3′,1″]terphenyl-5′-yl-anthracen-9-yl)-chrysene (DAC-TP). Such a highly twisted molecular structure can improve the electroluminescence (EL) efficiency of a material because it can inhibit rotational and vibrational motions. Also, since the doped state and single crystal structure imply, respectively, a diluted state and a molecular state, the EL efficiency of the doped OLED device is related to single crystal structure. In a 4% doped OLED device, 1,6 DAP-TP and DAC-TP showed CE of 2.10 cd A<SUP>−1</SUP> and 0.93 cd A<SUP>−1</SUP>, respectively. With its relatively more twisted single crystal structure, 1,6 DAP-TP showed higher CE in a doped OLED device than DAC-TP. Both compounds had ultra-deep blue emission y values of 0.06 or less for the color coordinates, which satisfy high density television display requirements (y value less than 0.08).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Relationship between the single crystal structure of materials and the EL performance of doped OLED devices was investigated. </LI> <LI> Highly twisted molecular structure can improve the EL efficiency of a material because it can inhibit various transition. </LI> <LI> As a result, doped OLED device using 1,6 DAP-TP had a CE of 2.10 cd A<SUP>−1</SUP>, 4.24% EQE, and CIE (x, y) (0.16, 0.06). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
정효철 ( Hyocheol Jung ),정지은 ( Ji-eun Jeong ),이상호 ( Sang-ho Lee ),김진철 ( Jin Chul Kim ),박영일 ( Young Il Park ) 한국공업화학회 2023 공업화학 Vol.34 No.3
근적외선 흡수 염료는 전통적으로 정보 기록 및 정보 표시 분야에 사용되었을 뿐만 아니라 최근 광학 필터, 바이오, 에너지 저장 및 변환, 코팅 첨가제 등 다양한 응용 분야에 적용되고 있다. 핸드폰이나 디지털 카메라에 사용되는 이미지 센서는 근적외선 영역에서도 감도를 나타내기 때문에 보다 선명한 이미지를 구현하기 위해 근적외선 광학필터가 필수적이다. 에너지 저장 및 변환이 중요해짐에 따라 투명 태양 전지 분야에서는 근적외선 영역까지 흡수 영역을 확장할 수 있도록 다양한 근적외선 흡수 소재가 개발되고 있으며, 이를 이용해 소자 효율을 향상시키는 연구가 진행되고 있다. 미래 모빌리티 기술로 많은 관심을 받고 있는 자기치유 코팅 시스템에 광-열 효과를 갖는 근적외선 흡수 염료가 도입되어 보다 효율적인 자기치유 성능을 구현하는 연구들도 보고되고 있다. 본 총설에서는 대표적인 근적외선 흡수 염료들의 화학 구조들을 소개하고, 근적외선 흡수 염료들을 기반으로 한 최신 응용 연구 동향에 대해 다뤄보고자 한다. Near-infrared (NIR) absorbing dyes have been applied to various applications such as optical filters, biotechnology, energy storage and conversion, coating additive, and traditionally information-storage materials. Because image sensors used in cellphones and digital cameras have sensitivity in the NIR region, the NIR cut-off filter is essential to achieving more clear images. As energy storage and conversion have been important, diverse NIR absorbing materials have been developed to extend the absorption region to the NIR region, and NIR absorbing materials-based research has proceeded to improve device performances. Adding NIR-absorbing dye with a photo-thermal effect to a self-healable coating system has been attractive for future mobility technology, and more effective self-healing properties have been reported. In this report, the chemical structures of representative NIR-absorbing dyes and state of the art research based on NIR-absorbing dyes are introduced.
Jung, Hyocheol,Kang, Seokwoo,Lee, Hayoon,Yu, Young-Jun,Jeong, Jae Ho,Song, Jie,Jeon, Youngmin,Park, Jongwook American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.36
<P>In this study, four emitters of blue light are synthesized by selecting pyrene with its high photoluminescence quantum yield (PLQY) as the core group and variants of the electron-donating diphenylamine (DPA) as side groups. The four compounds have different numbers, sizes, and substitution positions of alkyl groups on the DPA. Each of the four compounds when doped in OLED devices shows a high current efficiency (CE) of over 7 cd A<SUP>-1</SUP> and a high external quantum efficiency (EQE) of over 7.5%. In addition, the compounds yield electroluminescence (EL) spectra showing peaks with narrow full width at half-maximum (fwhm) values of 37-40 nm and hence indicative of high color purity. Moreover, one compound N1,N6-bis(5-(<I>tert</I>-butyl)-2-methylphenyl)-N1,N6-bis(2,4-dimethylphenyl)pyrene-1,6-diamine (3Me-1Bu-TPPDA), shows a very high EQE of 9.25% and a very long lifetime with an LT95 of 471 h.</P> [FIG OMISSION]</BR>