• Title, Summary, Keyword: green emission

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Investigation of the Green Emission Profile in PHOLED by Gasket Doping

  • Park, Won-Hyeok
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.226-226
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    • 2016
  • PHOLED devices which have the structure of ITO/HAT-CN(5nm)/NPB(50nm)/EML(30nm)/TPBi(10nm)/Alq3(20nm)/LiF(0.8nm)/Al(100nm) are fabricated to investigate the green emission profile in EML by using a gasket doping method. CBP and Ir(ppy)3 (2% wt) are co-deposited homogeneously as a background material of EML for green PHOLED, then a 5nm thickness of additionally doped layer by Ir(btp)2 (8% wt) is formed as a profiler of the green emission. The total thickness of the EML is maintained at 30nm while the distance of the profiler from the HTL/EML interface side (x) is changed in 5nm steps from 0nm to 25nm. As shown in Fig. 1, the green (513nm) peak from Ir(ppy)3 is not observed when Ir(btp)2 is also doped homogeneously because Ir(ppy)3 works as an gasket dopant of the Ir(btp)2 :CBP system. Therefore, in this experment, Ir(btp)2 can be used as a profiler of the green emission in CBP:Ir(ppy)3 system. The emission spectra from the PHOLED devices with different x are shown in Fig. 2. In this gasket doping system, stronger red peak means more energy transfer from green to red dopant or higher exciton density by green dopant. To find the green emission profile, the external quantum efficiency (EQE) at 3mA/cm2 for red peaks are calculated. More green light emission at near EML/HBL interface than that of HTL/EML is observed (insert of Fig. 2). This means that the higher exciton density at near EML/HBL interface in homogeneously doped CBP with Ir(ppy)3. As shown in Fig. 3, excitons can be quenched easily to HTL(NPB) because the T1 level of HTL(2.5eV) is relatively lower than that of EML(2.6eV). On the other hand, the T1 level of HBL(2.7eV) is higher than that of EML.

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A Note on Environmental Policy Measures in a Green Market (Green market과 환경정책수단의 오염감축효과에 대한 소고(小考))

  • Rhee, Hosaeng
    • Environmental and Resource Economics Review
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    • v.13 no.1
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    • pp.119-131
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    • 2004
  • A green market refers to a market that consists of environmentally aware consumers. A few researches have been carried out on the effects of environmental policy measures in a green market. These existing researches were based on a vertical differentiation model with firms' price-setting behavior, and derived that unit emission standard and environmental product taxes could not reduce the amount of pollution emission. This note considers a vertical differentiation model with firms' quantity-setting behavior, and shows that, contrary to the previous result, the amount of pollution emission is reduced by the introduction of unit emission standard. This implies the importance of the nature of firms' interaction in figuring out the pollution abatement effect of environmental policy measures in a green market.

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Creation and Management of Urban Green Field based on Carbon Emission Reduction (탄소배출 저감형 도시 그린필드의 조성 및 관리방안)

  • Park, Cheon-Bo;Choi, Joon-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.1
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    • pp.837-844
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    • 2015
  • The purpose of this paper is to suggest the method of creation and management of urban green field based on carbon emission reduction. For a case study, Daejeon Metropolitan City in Korea was chosen. For the study, the relevant concepts of green field and carbon emission plans are reviewed as a theoretical research, and current problems of the urban green field are surveyed focused on metropolitan cities in Korea. Implementation plans of park and green in Daejeon Metropolitan City were analysed in the aspect to carbon emission reduction, climate change responding and urban green field expansion. Finally, as a result of the study, the method of creation and management of urban green field based on carbon emission reduction in the perspectives of urban structure change, green field network, conservation of green field and relevant institutions are suggested.

Effects of Neon Plasma Emission on Optical Properties of Phosphor Layers in Surface-Type Alternate Current Plasma Display Panel

  • Jang, Sang-Hun;Cho, Ki-Duck;Tae, Heung-Sik;Park, Lee-Soon
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.171-174
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    • 2000
  • This study uses neon and xenon gas mixture discharges to determine the effects of the neon plasma emission on the characteristics of visible emission from the stimulation of the red, green, blue(RGB) phosphor layers in a surface-type alternate current plasma display panel(AC PDP). With a mixture of less than 2% xenon to neon, it is found that the luminance changes in the visible emission of the phosphor layers are similar to those of the neon plasma emission. In the range of xenon mix ratio from 2 to 5%, the luminance of the red, green, blue(RGB) phosphor layers decreases with a decrease in the neon plasma emission intensity. However, with a mixture of above 5% xenon to neon, the luminance of the red, green, blue(RGB) phosphor layers increases regardless of a decrease in the neon plasma emission intensity. Furthermore, the color purity of the red, green, blue(RGB) phosphor layers improve as the neon plasma emission intensity decreases. Accordingly, it is concluded that the optical properties of the phosphor layers, including color purity and luminance, depend on the neon plasma discharge emission as well as the visible emission from the stimulation of the phosphor layers.

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A Note on the Effects of the Greener Market on Pollution Emission (소비자 환경친화도 변화의 오염감축효과에 관한 소고(小考))

  • Rhee, Hosaeng
    • Environmental and Resource Economics Review
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    • v.16 no.2
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    • pp.363-378
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    • 2007
  • A green market for a product refers to the market where the more willingness to pay for the product consumers have, the greener is the product. As the green markets begin to spread out, researches have been carried out mostly on the effects of various environmental policy measures such as unit emission standard, environmental taxes as they are applied in the green markets. This paper focus on a different issue in the green markets, that is, the effects of the greener market on pollution emission. We consider two kinds of markets, which are fully or partially covered. In the fully covered market where the products sold are necessities such that all consumers purchase the product, as the market gets greener, the amount of pollution emission decreases. On the other hand, in the partiaily covered market, it is shown that the amount of pollution emission could increase as the market becomes greener. This critically depends on whether the total output decreases or increases as the market turns greener.

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A Study on Estimation of the Greenhouse Gas Emission from the Road Transportation Infrastructure Using the Geostatistical Analysis -A Case of the Daegu- (공간통계기법을 이용한 도로교통기반의 온실가스 관한 연구 -대구광역시를 대상으로-)

  • Lee, Sang Woo;Lee, Seung Wook;Lee, Seung Yeob;Hong, Won Hwa
    • Spatial Information Research
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    • v.22 no.1
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    • pp.9-17
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    • 2014
  • This study was intended to reliably predict the traffic green house gas emission in Daegu with the use of spatial statistical technique and calculate the traffic green house gas emission of each administrative district on the basis of the accurately predicted emission. First, with the use of the traffic actually surveyed at a traffic observation point, and traffic green house gas emission was calculated. Secondly, on the basis of the calculation, and with the use of Universal Kriging technique, this researcher set a suitable variogram modeling to accurately and reliably predict the green house gas emission at non-observation point suitable through spatial correlation, and then performed cross validation to prove the validity of the proper variogram modeling and Kriging technique. Thirdly, with the use of the validated kriging technique, traffic green gas emission was visualized, and its distribution features were analyzed to predict and calculate the traffic green house gas emission of each administrative district. As a result, regarding the traffic green house gas emission of each administration, it was found that Bukgu had the highest green house gas emission of $291,878,020kgCO_2eq/yr$.

Origin of Green Emission in Extremely Pure Oligofluorene Films: Effect of Molecular Packing

  • Kang, Ji-Hoon;Shin, Na-Yool;Jo Jung-Ho;Keivanidis Panagiotis E.;Laquai Frederic;Wegner Gerhard;Yoon, Do-Y.
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.236-236
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    • 2006
  • Time-resolved photoluminescence spectroscopy measurements of oligofluorenes with various side chains were studied. With extremely pure oligofluorenes, two kinds of red-shifted green emission were observed which have different origins; aggregate formation and on-chain chemical defect. The green emission around 490 nm was largely dependent upon the intermolecular interaction of oliglfuorene molecules. Moreover, by using oligofluorene with high-order liquid crystalline phase, we observed that the green emission was strongly dependent upon the molecular packing in solid films.

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A Study on the Green Climate Fund under the System of the Carbon Emission Reduction (탄소배출 감축제도하의 녹색기후기금에 관한 연구)

  • Lee, Eun Jung;Pak, Myong Sop
    • The Korean Research Institute of International Commerce and Law
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    • v.58
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    • pp.329-351
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    • 2013
  • Since the Kyoto Protocol was released in 2005, there has been a number of mechanisms about funding and how to allocate the burdens. The UNFCCC(United Nations Framework Convention on Climate Change)have discussed establishing an international fund to support the reduction of a greenhouse gas. As the availability of adaption finance for developing countries increase, it's needed for a way of prioritizing countries. This article analyzes the carbon reduction system that includes a emission trading scheme, a carbon tax and examines GCF(Green Climate Fund)'s role and needs. A solution to finance Green Climate Fund is more preferred a harmonized carbon tax that across all nations with carbon tax. Especially the role of industrialized countries is important that based on their historical responsibility for fossil fuel emission. That is, they should get more shares of the global costs than developing countries.

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Development of an alignment free mask patterning as a new fabrication method for high efficiency white organic light-emitting diodes

  • Joo, Chul-Woong;Jeon, Soon-Ok;Yook, Kyoung-Soo;Lee, Jun-Yeob
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.752-754
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    • 2009
  • High efficiency white organic light emitting diodes were fabricated by using an alignment free mask patterning method. Only red/green emission without any blue emission was observed in the red/green patterned region and blue emission was emitted in other area. A combination of the red/green and blue emission gave a high efficiency white emission. A maximum current efficiency of 30.7 cd/A and a current efficiency of 25.9 cd/A at 1000 cd/$m^2$ were obtained with a color coordinate of (0.38, 0.45).

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Selecting of Earth-work Equipment Combination Considered CO2 Emission (이산화탄소 배출량을 고려한 토공 장비조합의 선정)

  • Kim, Byung-Soo
    • Proceedings of the KSR Conference
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    • pp.1750-1756
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    • 2011
  • After Kyoto Protocol was adopted for green gas reduction, each nations are stepping up efforts to reduce $CO_2$ of a typical green gas. Construction industry also is trying $CO_2$ reduction with the techniques of two types which are software and hardware techniques. The software technique are Passive Design considered green gas emission and the environment impact assessment by LCA. The hardware techniques are adjustment of equipment system and development of eco- friendly material. But, it is nonexistent that a study related to $CO_2$ emission considered detail process in construction industry. This study analyzed the relativeness of equipment combination and $CO_2$ emission by calculate $CO_2$ emission follow to equipment combination on earth-work which is the process emitted most $CO_2$ among railway bedding construction.

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