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비화학전공 공학계 학생들의 일반화학 실험에 대한 흥미도 조사 및 이에 영향을 미치는 요인에 대한 연구
하윤경,남정희,김남현,Ha, Yun Kyoung,Nam, Jeong Hee,Kim, Nam Hyun 대한화학회 2000 대한화학회지 Vol.44 No.5
이 연구에서는 비화학전공 공학계 학생들의 일반화학실험에 대한 흥미도를 조사하고, 이러한 흥미도에 영향을 미치는 요인이 무엇인지 분석하였다. 연구결과 학생들은 일반화학 실험주제에 따라 흥미도의 차이를 보여주었다. 학생들은 이론에 치우치고 이를 재확인하 는 실험보다는, 실행활과 관련이 있고 자신들이 직접 무엇인가를 만들어 내는 실험을 선호하였다. 이러한 학생들의 흥미도에 영향을 미치는 변인으로 실험을 담당한 조교, 학생들이 전공, 성별의 요소를 선정하여 분석하였다. 이 중 조교변인이 학생들의 흥미도에 가장 큰 영향을 미치는 것으로 나타났으며, 학생들의 전공이나 성별은 학생들의 흥미도에 큰 영향을 미치는 않는 것으로 나타났다. In this study, the non-chemistry majors' interest in general chemistry 1aboratory work was investigated and analysed with respect to the factors affecting their interest. The results showed that the students have wide range of interest according to the topics of laboratory work They preferred the laboratory work in which they made some products by themselves and the work related to everyday life. They shost affecting factor.
새로운 금속 킬레이트 착물 발광체의 합성과 전기화학적 특성 연구
박지영,최돈수,김영관,하윤경,Park, Jee Young,Choi, Don Soo,Kim, Young Kwan,Ha, Yun Kyoung 대한화학회 2000 대한화학회지 Vol.44 No.3
다층 구조로 이루어진 유기 전계발광소자(OELD)는 평판 디스플레이에 응용될 수 있으므로 활발히 연구되고 있다. 금속 킬레이트 착물은 발광층을 구성하는 물질로 개발되고 있는데 이 중 몇 가지는 효율적인 전계발광(EL) 특성을 가진다고 알려져 있다. 본 연구에서는 청색 발광을 나타내는 몇 가지 금속 킬레이트 착물들을 합성하였다. 리간드 quinaldat나 8-quinoline carboxylate를 사용하였고 중심 금속으로는 베릴륨과 아연을 도입하였다. 이 착물들에 대하여 FT-IR, MS/FAB, $^1$H-NMR, UVvis, 광발광(PL) 특 성을 고찰하였다. 또한 순환 전압전류법(CV)으로 이들 착물로 형성된 필름의 전기화학적 밴드갭(Eg), 전자친화도(EA), 이온화 에너지(IP)를 조사하였다. 앞에서 얻은 UV-vis의 에너지 홉수 파장과 순환 전압전류법으로 구한 전기화학적 밴드갭올 비교, 논의하였다. 이러한 연구는 새로운 고효율 금속 착물 발광체의 개발에 밑거름이 될 것이며, 현재 이들 화합물로 EL 소자를 제작하는 연구가 진행 중에 있다. Oganic electroluminescent devices (OELD) with multilayer structures have been studied actively for the application to a flat-panel display. Netal-chelate complexes hrboxylate. These complexes were characterized by FT-IR, MS/FAB, $^1$H-NMR, UV-vis and photoluminescence (PL). More importantly, the electrochemical gap (Eg), electron affinity(EA) and ionization potential (IP) of these complex films were investigated. Data from cyclic voltammetry(CV) were compared with the bandgap obtained from UV-vis and discussed. Further studies on the EL of these new materials are now in progress.
Zn(BOX)₂와 Zn(BTZ)₂의 광발광 특성 및 전계발광 특성에 대한 전기 화학적 연구
박지영(Jee Young Park),권오관(Oh Kwan Kwon),최돈수(Don Soo Choi),김영관(Young Kwan Kim),손병청(Byoung Chung Sohn),하윤경(Yun Kyoung Ha) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1
Organic Electroluminescent devices(OELD) consisted of multilayer structures have been studied for the application the application to flat-panel display. Metal-chelate complexes, zinc bis(2-(2-hydroxyphenyl)benzoxazolate) (Zn(BOX)₂) and zinc bis(2-(2-hydroxyphenyl)benzothiazolate) (Zn(BOX)₂), have been intensively investigated as an white-light emitting layer and recognized to have good electroluminescent(EL) properties. In this study, (Zn(BOX)₂) and (Zn(BTZ)₂) were synthesized and characterized by FT-IR, ¹H-NMR, UV-VIS and PL. Their EL properties were also studied and their ionization potential(IP) and electron affinity(EA) were also measured by cyclic voltammetry(CV).
White - Light - Emitting Materials for Organic Electroluminescent Devices
김덕영(Duck Young Kim),권오관(Oh Kwan Kwon),권혁주(Hyuck Joo Kwon),김영관(Young Kwan Kim),손병청(Byoung Chung Sohn),하윤경(Yun Kyoung Ha) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.1
N/A White emission is important for applying organic EL devices to full-color flat panel display and backlight for liquid crystal display. In order to obtain white emission, the use of a light-emitting material which shows the white emission by itself is advantageous for these applications because of its high reliability and productivity. A chelate-metal complex such as zinc bis(2-(2-hydroxyphenyl) benzothiazolate) (Zn(BTZ)_2 was known to emit white light with a broad electroluminescence. In this study, the electroluminescent characteristics of Be(BTZ)_2 and Mg(BTZ)_2, as well as Zn(BTS)_2 were investigated using organic electroluminescent devices with the structure of ITO/TPD/ Be(BTZ)_2, Mg(BTZ)_2, or Zn(BTZ)_2/Al. It was found that the device containing Be(BTZ)_2 showed the highest power efficiency.
유기전기발광 소자용 다이포스핀-다이골드 착물 발광체의 합성과 특성 연구
河潤卿 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-
Diphosphine dinuclear gold(I) complexes were synthesized from reaction of 1,1'-Bis(diphenylphosphino)ferrocene(dppf) and gold ions. As anionic ligands, Cl was first coordinated to form (dppf)(AuCl)₂(I). Then, the ligand, SPh, was substituted for Cl in the complex I to give (dppf)(AuSPh)₂ (II). The melting points of the resulting complexes, I and II, were investigated at first hand to confirm that the gold complexes were in fact formed. The digold complexes were decomposed above 200℃ while the ligand, dppf, itself melts at 182℃. The photoluminescence (PL) spectra of the spin-coated thin films showed the maximum peak at 590 and 540nm for the complex, I and II, respectively. These complexes were thus found to give the orange color phosphorescence. Therefore, these digold complexes may be candidates for orange-red phosphorescent materials in organic electroluminescent devices (OELD). Further studies on application of the complexes as a dopant in an emitting layer are in progress in our laboratory.
河潤卿,魯碩原 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
2,4,6-Triphenyl-1,3,5-Triazine (TRZ) has been used as a hole blocking material for electroluminescent device(ELD)[4]. The EL devices of the four layer structure, ITO/hole transporting layer(HTL)/emitting layer/Al, were fabricated. TRZ was doped into the poly(n-vinylcarbazole)(PVK), which was spin-coated on indium tin oxide(ITO) film. The emitting layer, tris(8-hydroxyquinoline)aluminum(Alq₃), was deposited on top of PVK film. The ELD emits characteristic green color generated from Alq3 emitting layer. As the percentage of TRZ was increased, the efficiency of devices increased. The devices, which contained higher concentration of blocking material, were driven at a lower current under the same voltage. The optimum concentration of hole blocking material was 10wt%, which produced the highest ELD luminescence.