• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1683-1685
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• 1999

ITO films on plastic substrate were prepared by DC magnetron sputtering method using powdery target and their properties were investigated as a function of the deposition conditions. As the sputtering power and total pressure were higher, the resistivity of ITO films increased. The optical transmittance deteriorated with increasing sputtering power and thickness. As the total pressure increased, however, the optical transmittance improved at visible region of light. From these results, we could deposited ITO films with $8{\times}10^{-3}{\Omega}-cm$ of resistivity and 80% of transmittance at optimal conditions.

• 한국전기전자재료학회논문지
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• 제17권12호
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• pp.1277-1282
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• 2004

ITO films on PET substrate were prepared by DC magnetron sputtering method using powdery target with different deposition conditions. In addition, the electrical and optical properties were investigated. As the sputtering power and working pressure were higher, the resistvity of ITO films increased. The optical transmittance deteriorated with increasing sputtering power and thickness. As the working pressure increased, however, the optical transmittance improved at visible region of light. From these results, we could deposited ITO films with 8${\times}$10$^{-3}$ $\Omega$-cm of resistivity and 80 % of transmittance at optimal conditions.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.176-179
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• 2003

ITO films on PET substrate were prepared by DC magnetron sputtering method using powdery target with different deposition conditions. In addition, the electrical and optical properties were investigated. As the sputtering power and working pressure were higher, the resistvity of ITO films increased. The optical transmittance deteriorated with increasing sputtering power and thickness. As the working pressure increased, however, the optical transmittance improved at visible region of light. From these results, we could deposited ITO films with $8{\times}10^{-3}\;{\Omega}-cm$ of resistivity and 80% of transmittance at optimal conditions.

• 한국전자통신학회논문지
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• 제19권1호
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• pp.39-46
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• 2024

본 연구에서는 고주파 마그네트론 스퍼터링 법으로 공정압력을 1에서 7mTorr 로 변화시켜 가며 GTZO (Ga-Ti-Zn-O)박막을 제작하여, 구조적 특성과 전기적 및 광학적 특성을 조사하였다. XRD측정을 통해 공정압력에 무관하게 모든 GTZO박막이 c-축으로 우선 성장함을 확인할 수 있었고, 1mTorr 에서 제작한 GTZO 박막이 반가폭 0.38˚ 로 가장 우수한 결정성을 나타내었다. 가시광 영역(400~800 nm)에서의 평균 투과도는 공정압력에 상관없이 80% 이상의 값을 나타내었고, 공정압력이 증가함에 따라 캐리어 농도가 감소하고 이로 인해 에너지 밴드갭이 좁아지는 Burstein - Moss 효과도 관찰할 수 있었다. 공정압력 1mTorr 에서 증착한 GTZO박막의 재료 평가 지수는 9.08 × 10³ Ω^-1·cm^-1 로 가장 우수한 값을 나타내었고 이때 비저항과 가시광 영역에서의 평균 투과도는 각각 5.12 × 10^-4 Ω·cm 과 80.64 % 이었다.

• 한국세라믹학회지
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• 제44권6호
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• pp.303-307
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• 2007

Transparent In-doped zinc oxide (IZO) thin films are deposited with variation of pulsed DC power at Ar atmosphere on coming 7059 glass substrate by pulsed DC magnetron sputtering. A c-axis oriented IZO thin films were grown in perpendicular to the substrate. The optical transmittance spectra showed high transmittance of over 80% in the UV-visible region and exhibited the absorption edge of about 350 nm. Also, the IZO films exhibited the resistivity of ${\sim}10^{-3}{\Omega}\;cm$ and the mobility of ${\sim}6cm/V\;s$. Organic Light-emitting diodes (OLEDs) with IZO/N,N'-diphenyl-N, N'-bis(3-methylphenl)-1, 1'-biphenyl-4,4'-diamine (TPD)/tris (8-hydroxyquinoline) aluminum ($Alq_3$)/LiF/Al configuration were fabricated. LiF layer inserted is used as an interfacial layer to increase the electron injection. Under a current density of $100\;mA/cm^2$, the OLEDs show an excellent efficiency (9.4 V turn-on voltage) and a good brightness ($12000\;cd/m^2$) of the emission light from the devices. These results indicate that IZO films hold promise for anode electrodes in the OLEDs application.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.90-90
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• 2011

Transparent conducting oxide (TCO) films have been intensively utilized in the electric applications, such as, displays, lightings and solar cells due to the good electric conductivity with an excellent transmittance of the visible light. We, herein present an excellent Al-doped ZnO film (AZO), which has been fabricated by co-sputtering method. An as-deposited AZO film had an optical transmittance of 84.78% at 550 nm and a resistivity of $7.8{\times}10^{-3}{\Omega}cm$. A rapid annealing process significantly improved the optical transmittance and electrical resistivity of the AZO film to 99.67% and $1{\times}10^{-3}{\Omega}cm$, respectively. The fabricated AZO film was fabricated for a metal-semiconductor-metal (MSM) structure. The AZO film-embedding MSM device was highly responsive to a UV light.

• 한국산학기술학회논문지
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• 제21권12호
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• pp.10-15
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• 2020

파장 400 nm 이하의 자외선은 눈 건강에 매우 해롭다. 또한 고에너지 가시광도 망막 세포에 영향을 줄 수 있음이 최근에 밝혀졌다. 따라서 자외선 및 고에너지 가시광 차단 기능의 안경렌즈 개발이 시대적으로 요청되고 있다. 본 연구에서는 m-자일릴렌 디이소시아네이트 모노머와 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol 모노머 및 벤트리아졸 UV 흡수제, 알킬인산에스터 이형제, 안료혼합물(CI solvent violet 13), 이염화부틸주석 촉매제 등의 혼합물을 인젝션 몰드 방법으로 열중합 공정을 적용하여, 굴절률 1.67의 고굴절률 폴리머 안경렌즈를 제조하였다. 제조된 폴리머 안경렌즈의 양면에 전자빔 진공증착 시스템으로 다층 반사방지 코팅을 하였다. 제조된 안경렌즈의 자외선 및 고에너지 가시광 차단 기능을 UV-visible spectrophotometer로 분석하였다. 그 결과 UV 흡수제를 0.5wt% 첨가한 폴리머 안경렌즈가 411 nm 파장 이하의 자외선 및 고에너지 가시광을 99 % 이상 차단하였다. 또한 460 ~ 660 nm 파장의 명소시 시각 민감도 10% 이상의 영역에서 평균 투과율이 97.9%를 나타내어 명소시에서 선명한 상을 얻을 수 있었다.

• 한국응용과학기술학회지
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• 제33권3호
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• pp.483-491
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• 2016

나노실리카가 코팅된 유리 표면은 나노실리카 표면에 존재하는 친수성 수산기로 인해 방담성이 매우 증가하나, 실외에 설치된 유리에 코팅된 경우는 비에 의해 씻겨 나가 방담 특성의 내구성이 급격히 감소한다. 또한 나노실리카가 코팅된 유리 표면의 토폴로지는 광투과율 또는 반사방지 특성을 좌우하는 매우 중요한 인자이다. 이러한 나노실리카 코팅의 특성에 관한 내구성을 향상시키기 위하여 가교제로 테트라에틸오르소실리케이트 (TEOS)를 사용하여 나노실리카 (Ludox) 현탁액으로 친수성 나노실리카피막을 제조하였다. 산성 또는 염기성 수용액 중에서의 TEOS의 가수 분해 최적 조건도 물에 대한 접촉각 측정을 통하여 조사하였다. pH=4의 산성 조건에서 1.5 wt% 나노실리카-TEOS 코팅액으로 얻은 최종 투명한 친수성 코팅층은 매우 향상된 친수성에 대한 내구성뿐만 아니라, 코팅하지 않은 유리에 비해 약 2 % 포인트 정도 높은 가시광투과율을 나타내었다.

• 한국환경과학회지
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• 제26권4호
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• pp.543-547
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• 2017

Normalized Difference Vegetation Index (NDVI) has played an important role in assessing green plant biomass through remote sensing on global scale since the early 1970s. The concept of NDVI is based on the fact that green plants show higher reflection in near-infrared region than in visible region of the electromagnetic spectrum. However, it is well known that the relocation of chloroplasts in plant leaf cells may dramatically change the optical properties of plant leaves. In this study I traced the changes in the reflectance and transmittance properties of Tobacco leaves at the wavelengths of 660 and 800 nm after a sudden increase in light intensity. The results showed that NDVI of leaves gradually decreased from 72.7% to 69.9% when exposed to a sudden increase in light intensity from 30 to $1,200{\mu}mol/m^2{\cdot}s$. This means that the error resulting from the physiological status of the plant should be accounted for a more precise understanding of ground truth corresponding to the data from the remotely acquired images.

• KIEAE Journal
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• 제11권1호
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• pp.47-55
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• 2011

Daylight is highly beneficial for improving the indoor environmental quality and reducing building energy consumption, daylighting applications are scarcely considered, especially during the Rural standard house models design process, because of lack of previous studies on elderly-light environment and complex simulation process. Therefore, daylighting process were performed using ECOTECT, which has various advantage such as easy user interface and simple simulation processes. Moreover, dynamic daylight simulation were performed using whether data. Static simulation are performed to compute static metrics such as daylight factor, whereas dynamic simulation are performed for dynamic metrics such as daylight autonomy and useful daylight illuminance using annual weather data On the basis of daylight autonomy and useful daylight illuminance analysis result, variations in annual daylight performances. A parametric and regression analysis of the window-to-wall ratio and visible transmittance showed that daylight factor, daylight autonomy increased with window-to-wall ratio and visible transmittance. It can be concluded that this new daylight criteria. useful daylight illuminance, will enable architect to obtain better fenestration design.