• Transactions on Electrical and Electronic Materials
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• 제3권2호
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• pp.16-19
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• 2002

In this study, a novel red emitting organic electroluminescent (EL) device was fabricated with the bis(8-oxyquinolino)zinc II (Znq2) doped dye as an emitting layer. The Znq2 was synthesized successfully from zinc chloride (ZnC1$_2$) as an initial material. Then, we fabricated the red organic EL device with a dye (DCJTB) doped and inserted Znq2 between emission layer and cathode for increasing EL efficiency. The hole transporting layer is a N,N'-diphenyl-N,N'-bis-(3-methylphenyl)-1,1'-diphenyl-4,4-diamine (TPD), and the host material of emission layer is Znq2. And the electrical and luminance characteristics of the device were measured. We found that the EL device with Znq2 inserting layer results in the increasing luminance efficiency.

• 한국전기전자재료학회논문지
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• 제20권8호
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• pp.711-715
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• 2007

Properties of organic light-emitting diodes (OLEDs) with aluminum-doped zinc oxide (ZnO:Al) anodes showed different behaviors from OLEDs with indium tin oxide (ITO) anodes according to driving conditions. OLEDs with ITO anodes gave higher current density and luminance in lower voltage region and better EL and power efficiency under lower current density conditions, However, OLEDs with ZnO:Al anodes gave higher current density and luminance in higher voltage region over about 8V and better EL and power efficiency under higher current density over $200mA/cm^2$. These seemed to be due to the differences in conduction properties of semiconducting ZnO:Al and metallic ITO. OLEDs with ZnO:Al anodes showed nearly saturated efficiency under high current driving conditions compared with those of OLEDs with ITO anodes. This meant better charge balance in OLEDs with ZnO:Al anodes. These properties of OLEDs with ZnO:Al anodes are useful in making bright display devices with efficiency.

• 한국응용과학기술학회지
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• 제18권4호
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• pp.292-297
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• 2001

Zinc complexes with Bis[2-(o-hydroxyphenyl) benzothiazolato ligands (ZnPBS-0) and Bis[2- (o-hydroxynaphthyl) benzothiazolato ligands (ZnPBS-05) were synthesized, and luminescent properties of these materials were investigated. The emission band found that it strongly depends on the molecular structure of introduced ligand and was tuned from 525 nm to 535 nm by changing the ligand structures. Spreading of the ${\pi}-conjugation$ in 2-(o-hydroxyphenyl) group gives rise to a blue shift. On the other hand, spreading of the ${\pi}-conjugation$ in benzothiazole groups leads to a red shift. The EL properties also showed good consistency with their differences of ligand structure. Bright-blue EL emission with a maximum luminance of 8300 $cd/m^{2}$ at 11V was obtained from the organic light - emitting diodes (OLEDs) using ZnPBS-0 as emitting layer. It was also found that the newly synthesized materials were suitable to be used as emitting materials in organic EL device.

• 한국토양비료학회지
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• 제5권1호
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• pp.41-47
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• 1972

우리나라 보은(報恩), 필리핀의 Batangas 토양(土壤)을 공시(供試)로 하여 수도생육(水稻生育)에 있어서 아연결핍(亞鉛缺乏)에 관(關)한 시험(試驗)을 국제미작연구소(國際米作硏究所)(IRRI)에 연구(硏究)한 결과(結果)는 다음과 같다. 1. 한국(韓國)의 보은토양(報恩土壤)은 산성(酸性)이며 유기물(有機物) 함량(含量)이 적고 수도체내(水稻體內)의 아연함량(亞鉛含量)도 33ppm인 정상적(正常的)인 토양(土壤)이고 비율빈(比律賓)의 Batangas 토양(土壤)은 Alkali며 토양유기물(土壤有機物)이 많고 Ca함량(含量)이 많은 Ca Calareous 토양(土壤)이고 수도체내(水稻體內)의 아연함량(亞鉛含量)도 16ppm으로 심한 아연결피증(亞鉛缺乏症)을 보였다. 2. 수도체내(水稻體內)의 아연분포(亞鉛分布)는 생육(生育)이 왕성(旺盛)한 상위엽(上位葉)에 많이 축적(蓄積)된다. 수도체내아연함량(水稻體內亞鉛含量)이 18ppm 이하(以下)이면 아연결핍(亞鉛缺乏)을 나타낼 우려가 있다. 3. 아연결핍(亞鉛缺乏) 토양(土壤)에는 요소질비료(窒素質肥料)로써 생리적산성비료(生理的酸性肥料)인 유안(硫安)이 좋고 요소(尿素)는 적합(適合)치 않았다. 4. 수도체내(水稻體內)의 Zn 다량흡수(多量吸收)는 Mn 흡수(吸收)를 조해(阻害)하며 수도체내(水稻體內)의 Mn/Zn 비(比)가 클수록 아연결핍(亞鉛缺乏)을 촉진(促進)한다. 5. 아연결핍토양(亞鉛缺乏土壤)인 Batangas 토양(土壤)에 $ZnCl_2$와 F.T.E의 시용효과(施用效果)가 컸으며 수확량(收穫量)은 대비구(對比區)에 비(比)해 유의성(有意性)있게 증수(增收) 되었다.

• 한국토양비료학회지
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• 제50권5호
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• pp.401-408
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• 2017

Organic amendments such as animal waste compost, lime-bordeaux mixture, and lime sulphur mixture contain heavy metal(loid)s which are toxic to human being, animal, and plant. The objective of this study was to compare heavy metal(loid)s contamination of soil between conventional and organic farm. Soil samples were collected from 10 conventional and 38 organic fruit farms. At each sampling point, top (0~15 cm) and sub soil (15~30 cm) were taken using hand auger. Total concentration for arsenic (As), cadmium (Cd), copper (Cu), nikel (Ni), lead (Pb), and zinc (Zn) in the collected soil were measured. The pollution index (PI) for heavy metal in organic farms indicated it was unpolluted area. However, mean value of PI for organic farms (0.143) was higher than that for conventional farms (0.122). High Geoaccumulation index (Igeo) for Cu, Pb, and Zn implied that grape farms were more polluted than others fruit farms because a lot of lime-bordeaux mixture and lime sulphur were applied in organic grape farms. Especially, top soils showed higher level of contamination than sub soil. Based on the above results, organic amendments might cause accumulation of heavy metals in soil. Therefore, particular attention should be paid for concentration of Cu, Pb, and Zn, when organic amendments are used in the organic fruit farms.

• Applied Science and Convergence Technology
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• 제24권5호
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• pp.151-155
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• 2015

The interfacial electronic structure between zinc phthalocyanine (ZnPc) and aluminumdoped zinc oxide (AZO) substrates has been evaluated by ultraviolet photoemission spectroscopy and angle-dependent x-ray absorption spectroscopy to understanding the molecular orientation of a ZnPc layer on the performance of small molecule organic photovoltaics (OPVs). We find that the ZnPc tilt angle improves the ${\pi}-{\pi}$ interaction on the AZO substrate, thus leading to an improved short-circuit current in OPVs based on phthalocyanine. Furthermore, the molecular orientation-dependent energy level alignment has been analyzed in detail using ultraviolet photoemission spectroscopy. We also obtained complete energy level diagrams of ZnPc/AZO and ZnPc/indium thin oxide.

• Corrosion Science and Technology
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• 제11권1호
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• pp.15-19
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• 2012

Both electrogalvanized and hot-dip galvanized steel sheets have been finally produced via organic-inorganic surface coating process on the zinc surface to enhance corrosion resistance and afford additional functional properties. Recently, POSCO has been developed a variety of chromate-free coated steels that are widely used in household, construction and automotive applications. New organic-inorganic hybrid coating solutions as chromate alternatives are comprised of surface modified silicate with silane coupling agent and inorganic corrosion inhibitors as an aqueous formulation. In this paper we have prepared new type of hybrid coatings and evaluated quality performances such as corrosion resistance, spot weldability, thermal tolerance, and paint adhesion property etc. The electrogalvanized steels with these coating solutions exhibit good anti-corrosion property compared to those of chromate coated steels. Detailed components composition of coating solutions and experimental results suggest that strong binding between organic-inorganic hybrid coating layer and zinc surface plays a key role in the advanced quality performances.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1408-1411
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• 2009

This paper describes organic acid-based wet chemical etching behaviors of amorphous Ga-doped zinc oxide (GZO) thin film sputter-deposited at low temperature (room temperature). Wet etch parameters such as etching time, temperature, and etchant concentration are investigated for formic and citric acid etchants, and their effects on the etch rate, etch residue and the feature of edge line are compared.

• 한국유기농업학회지
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• 제3권1호
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• pp.79-85
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• 1994

Worm cast is one of the effective and the least harmful organic fertilizer. The purpost of this work is to elucidate the physiological role of worm cast in the plant growth. Worm cast extract contains 17.83ppm of zinc, but either cadmium or lead were not detected in it. Cucumber (Cucumis sativus L. cv. H. N. Semiwhite) was germinated and incubated with percentage-varied extract. While 10% extract stimulated sprouting of seeds, 100% extract had no effct on it. 50% extract and 100% extract enhanced hypercotyl elongation and fresh weight most effectively. Dry matter and zinc concentration in hypercotyl were increased as percentage of extract increased. Protein con-tent was not affected by extract, 100% extract inhibits water uptake of seedling. Considering these, enhancement of seedling growth was mainly based on increment of water uptake.

• 한국염색가공학회지
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• 제28권2호
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• pp.118-123
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• 2016

The use of natural organic dyes obtained from renewable resources such as plants and trees has the potential for not only preserving petrochemicals but also all-endangered environment for coming next generations. In spite of inferior fastness, natural dyes can be employed in the colouration of natural as well as synthetic fibers. Recently, the potentiality of using natural dyes in colouration with additional UV-protection and antimicrobial properties has been reported. This study is aimed to investigate the effect of Zinc compounds compared to another metallic compounds as mordants on the dyeing properties of natural dye extracted from mulberry leaves and coffee. In this study, the results showed Zinc compounds was expose that is more similar than other mordants in washing fastness through a repeated experiment. Also, Zinc is the environmental impact is less material compared with other mordants, essential edibility minerals ingredient that is necessary in human body.