• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 광주전남지부
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• pp.114-118
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• 2006

We investigated the transient electroluminescence (EL) and modulation characteristics of red organic light-emitting diodes (OLEDs), which consist with 4-(dicyanomethylene)-2-i -propyl-6-(1,1,7,7-tetramethyljulolidyl-9-cnyl)-4H-pyran (DCJTI) and rubrene doped into tris(8-hydroxyquinoline)aluminum ($Alq_3$). The transient EL waveforms showed two components, the overshooting peak and constant component, indicating that the excess amount of accumulated charges simultaneously recombine at the onset moment. This overshooting effect reduced the rise time of transient EL and enhanced the optical output of OLEDs when the pulse voltage applied to the device. We demonstrated that the red OLEDs could be use for the high-speed switching application by driving at more than 100 MHz and transmitting the video signals utilized as the electro-optical conversion device

• 한국위성정보통신학회논문지
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• 제11권3호
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• pp.28-31
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• 2016

본 연구에서는 최근 의료용으로 많이 사용되고 있는 고휘도, 고균일도의 직하광원구조를 가지는 백라이트 유닛에 대한 설계 시뮬레이션을 실시하였다. 직하형 백라이트 시스템은 기존의 Edge-Lighr 방식에 비해서 고휘도 및 고균일도를 달성할 수 있어 의료용 판독이 요구되는 고품질의 디스플레이에 사용되고 있으며, 흑백이미지를 바탕으로 진단을 실시하는 경우가 많기 때문에 휘도 및 휘도 균일도에 대한 높은 성능이 요구되는 분야이다. 본 연구에서는 복수 개의 램프를 수평으로 배열한 경우에 각 램프간의 거리 및 반사판과의 거리, 상측 확산판과의 거리에 대한 최적설계를 실시하고, 이 결과를 바탕으로 실물과 유사한 조건에서 시뮬레이션을 실시하였다. 연구 결과, Parameter 에 의존하는 변수를 최적화 할 수 있었으며, 4.5mm 의 램프와 반사판 거리 및 26mm 의 램프간 거리를 바탕으로 16개의 램프를 배치하여, 32인치 크기의 화면에서 6423nit 의 중심휘도를 갖는 고품위의 우수한 광원의 설계가 가능함을 확인할 수 있었다.

• 한국수소및신에너지학회논문집
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• 제14권3호
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• pp.247-257
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• 2003

To investigate the effect of preparing condition on the physical properties of carbon nanotubes suitable for optical applications, carbon nanotubes were synthesized by thermal chemical vapor deposition using Ni particles as a catalyst on stainless steel substrate and acetylene as a reactant gas. To examine the physical and optical properties, SEM, TEM, Ram an, UV-visible, and photoluminescence spectroscopy were used. The physical properties of carbon nanotubes such as diameter, degree of growth density and morphology were closely related to such experimental conditions as Ni particle size, growing pressure, and etching condit on of Ni particles, it appeared from the light absorbance and photoluminescence spectra of carbon nanotube mixture prepared with an addition of a photopolymer, P3HT(Poly(3-hexylthIop hene)) that carbon nanotube could do a role as a kind of electron acceptor for solar cell application.

• 한국태양에너지학회 논문집
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• 제21권2호
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• pp.45-54
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• 2001

In this study, the characteristics of optical fibers for the application in photocatalytic system was investigated using the intentionally designed accessories for spectrometer and radiometer to resolve the problems associated with the conventional system such as cost and structural restrictions from artificial lamp usage, to broaden the application fields into underground, and to utilize solar light in the future. To do this two kinds of optical fibers, plastic optical fiber (POF) and quartz optical fiber (QOF) were compared in terms of characteristics related with light transmittance and absorption and reactivity in TCE degradation.

• 정보저장시스템학회논문집
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• 제1권2호
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• pp.188-191
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• 2005

Two different coverlayers which is useful for an optical buffer and a mechanical protection made of not only UV resin but also polycarbonate coversheet were prepared on small form factor optical disks. Thin coverlayer of 10 ${\mu}m$ and thick coverlayer of 80 ${\mu}m$ were fabricated. 10 ${\mu}m$-thick coverlayer was coated using UV resin material by spin coating method for the flying optical head application. On the other hand, 80 ${\mu}m$-thick coverlayer using coversheet with the resin bonding material was prepared for the non-flying optical head application. Both cases, the thickness uniformity seem to be the primary prerequisite factor, and it was analyzed. Thickness of 10 ${\mu}m$-thick UV resin coverlayer could be controlled within ${\pm}0.2m$ range and 80 ${\mu}m$-thick coversheet could be controlled within ${\pm}3{\mu}m$ range. However, the yield of such thickness tolerance was not good. New design of metal housing holder and polycarbonate outer ring was adopted to diminish the ski-jump phenomenon. Specifically, the polycarbonate outer ring was very effective to reduce the ski-jump. However, it should be careful to maintain uniform edge between disk and ring for the perfect coverlayer.

• 센서학회지
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• 제31권5호
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• pp.353-359
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• 2022

This study investigated via computational analysis the application utility of series-cascaded ring resonators based on silicon-on-insulator (SOI) slot optical waveguides in integrated optical biochemical sensors. The radii of the two rings in the series-cascaded ring resonators were 59.4 ㎛ and 77.6 ㎛ respectively, and the coupling distance was 0.5 ㎛. The series-cascaded ring resonators were computationally analyzed using FIMMProp and PICWave numerical software. The free spectral range (FSR), full width at half maximum (FWHM), sensitivity, and quality-factor (Q-factor) of the series-cascaded ring resonators were 12.2 nm, 0.134 nm, 4100 nm/RIU, and 11580, respectively, and the measurement range was calculated to be slightly smaller than 3×10^-3 RIU. Although the measurement range was smaller than that of the single ring resonator, upon considering other characteristic parameters, the series-cascaded ring resonators are found to be more effective as integrated sensors than single ring resonators.

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.145-146
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• 2009

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.194-195
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• 2001

• 한국광학회:학술대회논문집
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• 한국광학회 1999년도 제16회 광학 및 양자전자 학술발표회Proceedings of 16th Optics and Quantum Electronics Conference, 1999
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• pp.64-65
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• 1999

• 한국광학회:학술대회논문집
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• 한국광학회 1996년도 Advance Program of 13th optics andquantum Electronics conference, 1996제13 회 광학 및 양자전자 학술 발표회 논문 요약집
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• pp.9-9
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• 1996