• International Journal of Internet, Broadcasting and Communication
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• 제7권2호
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• pp.9-15
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• 2015

Various studies with regard to increasing the optical efficiency of plasmonic color filters have previously been conducted, such as mixing materials or applying diverse pattern shapes. Fundamentally, it is important to maximize the photonic crystal effect by finding the optimum periods of lattice as well as calculating the most efficient transmission area. In this study, we propose a technical method for optimizing the plasmonic color filters that have a high color gamut and luminance by analyzing the light spectrums based on the 1931 color coordinate system. Moreover, we suggest a calculation method in order to define the individual color purity of red and green and blue filters. Consequently, efficiency values are obtained independently from each color filter by evaluating the color purity and the luminance. The final result obtained from simulation are 27.6% of relative luminance and 25.3% of color gamut. The proposed optimization method is applicable to all plasmonic color filters having photonic crystal arrays.

• Applied Science and Convergence Technology
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• 제25권1호
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• pp.1-6
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• 2016

Quantum dots (QDs) are considered as excellent color conversion and self-emitting materials for display and lighting applications. In this article, various technologies which can be used to realize white light emission with QDs are discussed. QDs have good color purity with a narrow emission spectrum and tunable optical properties with size control capabilities. For white light emission with a color-conversion approach, QDs are combined with blue-emitting inorganic and organic light-emitting diodes (LED) to generate white emission with high energy conversion efficiency and a high color rendering index for various display and lighting applications. Various device structures for self-emitting white QD light-emitting diodes (QD-LED) are also reviewed. Various stacking and patterning technologies are discussed in relation to QD-LED devices.

• 품질경영학회지
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• 제16권1호
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• pp.1-7
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• 1988

The most important element upon the quality of family glass products is the color of glass, which is the first object of consumers concern in purchasing. Therefore, colorless and transparent color tone can level up the additional value of the products. But we have produced the glass products in a large quantity by using the automatic tank brazier, chronic problem has been left over the color tone. By compounding and analizing the management techniques applied by peculiar technique and design of experiments pertinently, and by adjusting the decoloring composition ratio, we can contribute to improvement of color tone as well as to the cost reduction by diminishing the unnecessary decoloring agent. Intangible effect was the securing the superiority of quality home and abroad with the improvement of color tone and was taking a triangular position the factors influencing the glass decoloring which had been an unexhausted field. Tangible effect was the reduction of decoloring cost by diminishing the unnecessary oxidant. We registered the optimal composition ratio condition which was searched by applicating the design of experiments. To maintain good color tone, we manage the degree of purity, the most important thing among the items of color tone, continuously by control chart and it has maintained steady state now.

• 한국세라믹학회지
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• 제47권2호
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• pp.122-126
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• 2010

In this article photoluminescence of the $Al_2O_3:xCr_2O_3$ solid solutions prepared by solid state reaction method are represented. The effect of $Cr_2O_3$-activator concentration and heat treatment time on the PL characteristics have been discussed in conjunction with microstructure of phosphor samples. The $Al_2O_3:xCr_2O_3$ phosphors show the highest PL intensity at x=0.003 mole when the samples are reacted at $1600^{\circ}C$ for 5 h. The PL emission and absorption spectra show the maximum peaks at 698 nm and at 398 nm respectively. The CIE color coordinate is (x=0.646, y=0.316) at 0.003 mole $Cr_2O_3$, which value is very close to the NTSC coordinate of red color. This characteristic feature of $Al_2O_3:xCr_2O_3$ has been applied for an additive to improve the color characteristic of other red phosphor $LiEuW_2O_8$ which has a relatively poor color purity with an emission peak centered at 615 nm and with a CIE coordinate (x=0.530, y=0.280). The $Al_2O_3:0.003Cr_2O_3$ phosphor has been mixed with the $LiEuW_2O_8$ phosphor powder and the PL characteristics and CIE color coordinates are characterized. The $Al_2O_3:xCr_2O_3$ phosphor was found effective for improving the CRI (color rendering index) of $LiEuW_2O_8$ phosphor.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.939-942
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• 2001

We fabricated Red Organic light-emitting devices(OLED). The Basic Device Structure is ITO/hole transfer layer, TPD(50nm)/red emitting layer, Alq3 doped with DCM2 or DCM2:rubrene(xnm)/electorn transfer layer, Alq3(50-xnm)/LiF(0.8nm)/Al(8nm) . The thickness of emitting layer(xnm) changed 5, 10, 20nm. we demonstrate red emitting OLED with dependent on the thickness and concentrators of Alq3 layer doped with DCM2 or co-doped with DCM2:ruberene. The Emission color and Brightness are changed with doping or co-doping condition, dopant concentarton. In the case of rubrene:DCM2 co-doped layer structure, the red color Purity and device efficiency is improved. The CIE index of rubrene co-doped OLED is x=0.67, y=0.31. By co-doping the Alq3 layer with DCM2, rubrene, EL efficiency improved from 0.38cd/A to 0.44cd/A in comparison whit DCM2 doped Alq3 layer.

• 반도체디스플레이기술학회지
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• 제21권3호
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• pp.119-124
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• 2022

Top emission organic light-emitting diode (TEOLED) is commonly used because of high efficiency and good color purity than bottom - emission organic light-emitting device (BEOLED). Unlike BEOLED, TEOLED contain semitransparent metal cathode and capping layer. Because there are many characteristics to consider just simple thickness change, optimizing organic thickness of TEOLED for microcavity is difficult. So, in this study, we optimized Device capping layer at unoptimized micro-cavity structure TEOLED device. And we compare only capping layer with unoptimized microcavity structure can overcome optimized micro-cavity structure device. We used previous our optimized micro-cavity structure to compare each other. As a result, it has been found that the efficiency can be obtained almost the same or higher only capping layer, which is stacked on top of the device and controls only the thickness and refractive index, without complicated structural calculations. This means that higher efficiencies can be obtained more easily in laboratories with limited organic materials or when optimizing new structures etc.

• 대한환경공학회지
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• 제30권12호
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• pp.1273-1280
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• 2008

본 연구에서는 섬유가공공정 중 머서화공정으로부터 가성소다액를 회수하기 위한 최적의 운전조건을 확립하고자 하였다. 주요 인자들로는 NF/RO막의 적용을 위해 세라믹 막을 이용하여 파울링 지수를 평가, 고분자 막의 적용을 위해 가성소다액의 회수율을 측정, 막의 재생율 향상, 화학세정 조건, 유기물부하, 탁도 및 색도의 최적 제거조건, 그리고 세라믹 막과 고분자막의 복합공정에서의 투과플럭스를 조사하였다. 결과에 따르면, 1단계 공정의 세라믹 한외여과막과 2단계 공정의 나노여과막은 총부유고형물, 잔류유기물, 색도를 포함한 탁도의 제거 그리고 가성소다 용액의 회수에 적합한 공정구성임을 확인하였다. 한외여과막만을 단독으로 사용했을 경우, 총 부유물질과 탁도를 99.0%이상 제거하였고, 색도와 TOC는 각각 74.7%와 49.2%의 제거효율을 얻을 수 있었다. 반면에 세라믹 UF+NF 복합막 공정에서는 총 부유물질과 탁도를 99.9%이상 제거할 수 있었고, 색도는 87.7%, TOC는 78.2%의 제거효율을 얻을 수 있었다. 특히, 복합막 공정에서는 83.7%의 부피회수율일 때 91.3% 가성소다를 성공적으로 회수 할 수 있었다. 이러한 측면에서 복합공정을 통해 가성소다 폐수로부터 순도 높은 가성소다액을 회수할 수 있었으며, 회수된 가성소다액은 공정 내에 재사용이 가능하여 경제적인 이득을 기대할 수 있다.

• 대한화장품학회지
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• 제34권3호
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• pp.167-173
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• 2008

화장품 분야에서 펄 안료는 다양하게 적용되어져 왔다. 지금까지 가장 대중적으로 사용된 펄 안료는 마이카 기재에 산화철이 코팅된 것이었지만, 최종 제품에 이와 같은 펄을 사용하게 될 경우 천연 마이카에 함유된 불순물로 인해 약간의 불투명한 노란 색상이 띄게 된다[1,2]. 본 연구는 눈과 같은 반짝임을 제공하는 펄 안료 개발에 초점을 맞췄고, 눈과 같은 효과는 펄 안료의 구조와 순도 등의 영향 때문인 것을 알게 되었다. 특히, 이번 펄 안료 개발은 유리 기재와 산화철을 코팅시켜 눈의 광학적인 값(refractive index)과 입자 크기(particle size)를 눈과 유사하게 개발하였고 이는 눈과 같이 화려한 반짝임(glittering) 효과를 구현할 수 있게 되었다. 그리고 메이크업 제품에 본 펄 안료를 적용하여 화려한 제품을 개발하게 되었다.