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Sunwoo Kang,Jun Yeob Lee,Taekyung Kim 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.1
The origin of efciency-lifetime trade-of in triplet–triplet fusion (TTF) type blue fuorescent organic light-emitting diodes(OLEDs) was investigated and the device structure to resolve the issue was developed. The efciency and lifetime were simultaneously improved in the blue OLEDs by developing a multilayer hole transport stack which can adjust carrier densities andrecombination zone in the emitting layer (EML). It was found that electron leakage from EML and high spatial density of excitons in the vicinity of the electron blocking layer for high TTF rates by narrow recombination zone are the detrimental factorsfor efciency-lifetime trade-of. A multilayer hole transport stack employing a deep highest occupied molecular orbital holetransport layer and an electron blocking layer combined with an appropriate hole blocking layer simultaneously improved thepower efciency by 16% at 500 cd/m2and lifetime by almost 100% (from 73 h up to 145 h). In addition, the low efciency in thelow luminance region was also completely controlled, resulting in negligible efciency variation in the entire luminance range.
Kang, Sunwoo,Karthikeyan, S.,Lee, Jin Yong The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.4
<P>The enhancement of hydrogen storage in complexes of magnesium alanate ([Mg(AlH<SUB>4</SUB>)<SUB>2</SUB>]<SUB><I>n</I></SUB><SUP>−</SUP> where <I>n</I> = 2, 3) and their anions was investigated using the B3LYP/6-311++G** method. Hydrogen atoms were chemically absorbed on [Mg(AlH<SUB>4</SUB>)<SUB>2</SUB>]<SUB><I>n</I></SUB><SUP>−</SUP> (<I>n</I> = 2, 3) with binding energies of −83 to –91.23 kcal mol<SUP>−1</SUP>. It was determined that a maximum of two hydrogen atoms can be absorbed on [Mg(AlH<SUB>4</SUB>)<SUB>2</SUB>]<SUB><I>n</I></SUB><SUP>−</SUP> (<I>n</I> = 2, 3) complexes at 10.51 and 10.21 wt%, respectively. Natural bond order analysis revealed that, in the absence of hydrogen, the excess electron population lies predominantly along the sigma bonds between Mg<SUP>2+</SUP> atoms, while, upon absorption of the hydrogen atoms, the excess electron population lies on the absorbed hydrogen atoms. The vertical detachment energy showed that the excess electron is strongly bound to [Mg(AlH<SUB>4</SUB>)<SUB>2</SUB>]<SUB><I>n</I></SUB><SUP>−</SUP> (<I>n</I> = 2, 3) complexes with energies of 78 to 153 kcal mol<SUP>−1</SUP>. It can be seen from the stabilization energy values that the stability of hydrogen-absorbed complexes with excess electrons was significantly enhanced.</P> <P>Graphic Abstract</P><P>The enhancement of hydrogen storage in complexes of magnesium alanate ([Mg(AlH<SUB>4</SUB>)<SUB>2</SUB>]<SUB><I>n</I></SUB><SUP>−</SUP> where <I>n</I> = 2, 3) and their anions was investigated using the B3LYP/6-311++G** method. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43297h'> </P>
Instructional Planning in Online Universities in Korea
Sunwoo Kang,Young Sun Chung 한국콘텐츠학회 2012 International Journal of Contents Vol.8 No.1
The present study explores how the stress of online learners is related to Korean cultural norms and social expectation and presents the criteria online education should aim at when designing instructional approaches. A sample of 176 students from a Korean online university participated in a study investigating the patterns in the academic and personal stressors they face. This study also examines stressor types in relation to sample characteristics, analyzed with a categorization method developed by extant researchers on the stress faced by U.S. college students. Unlike the findings of previous studies on college student stress, this study’s results reveal that nontraditional Korean online students were faced with (1) taking on the multiple roles at work and home prescribed by cultural and social norms, and (2) challenges in regulating study habits and the learning environment as adult learners. The relevant implications for the design of online learning are discussed.
이미지 센서 컬러 필터용 다이온 성분을 포함하는 신규 황색 퀴놀린 유도체
박선우 ( Sunwoo Park ),오세영 ( Seyoung Oh ),강유나 ( Yuna Kang ),권혁민 ( Hyukmin Kwon ),대선우 ( Sunwoo Dae ),이찬규 ( Changyu Lee ),김대원 ( Dae Won Kim ),장민식 ( Min-sik Jang ),박종욱 ( Jongwook Park ) 한국공업화학회 2023 공업화학 Vol.34 No.1
이미지 센서 컬러 필터에 사용하기 위해 새로운 노란색 퀴놀린-다이온 염료 파생물을 설계하고 합성했습니다. 합성된 화합물은 퀴놀린과 디온 그룹으로 구성된 기본 화학 구조를 가지고 있습니다. 새로운 재료는 상업적 장치 제조 공정을 모방한 조건에서 광학적, 열적 특성을 기반으로 평가되었습니다. 이들의 관련 성능을 비교한 결과, 제조된 두 화합물 사이에서 2-(3-hydroxyquinolin-2(1H)-ylidene)-1H-indene-1,3(2H)-dione (HQIDO)이 다음과 같은 우수한 성능을 나타냈습니다. 프로필렌 글리콜 모노메틸 에테르 아세테이트 용매에서 0.5 wt%보다 큰 용해도, 각각 298 ℃의 높은 분해 온도를 포함하는 이미지 센서 컬러 필터 재료. 결과는 HQIDO가 이미지 센서 착색제에서 노란색 염료 첨가제로 사용될 수 있음을 시사합니다. New yellow quinoline-dione dye derivatives were designed and synthesized for use in image sensor color filters. The synthesized compounds have a basic chemical structure composed of quinoline and dione groups. New materials were evaluated on the basis of their optical and thermal properties under conditions mimicking those of a commercial device fabrication process. A comparison of their related performances revealed that, between the two prepared compounds, 2-(3-hydroxyquinolin-2(1H)-ylidene)-1H-indene-1,3(2H)-dione (HQIDO) exhibited the superior performance as an image sensor color filter material, including a solubility greater than 0.5 wt% in propylene glycol monomethyl ether acetate solvent and a high decomposition temperature of 298 ℃, respectively. The results suggest that HQIDO can be used as a yellow dye additive in an image sensor colorant.