• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.143-146
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• 1996

In (GeTe)$_{100-x}$(Sb$_2$Te$_3$)$_{x}$(x=33.5, 50, 66.5, 80 at.%) thin films, the optical properties of amorphous and crystalline thin film, XRD were studied. Also, the application for the phase change optical recording materials with the high stability and rapid erasing ability were studied. In the (GeTe)$_{100-x}$(Sb$_2$Te$_{3}$)$_{x}$ the transmittance was decreased with the increase of x. In all thin films, the transmittance was decreased and the reflectance was increased by annealing and particularly, the reflectance before and after annealing showed the large reflectance ratio. The XRD pattern, it was confined that these change of optical properties was due to the crystallization of amorphous thin films. The reflectance change was investigated using isothermal annealing condition.ion.ion.

• 한국화재소방학회논문지
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• 제28권2호
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• pp.9-13
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• 2014

본 논문은 화재감지는 물론 화원까지 구별할 수 있는 광전식 연기감지기 개발을 위한 기초 연구이다. 이를 위해, 현재 광전식 연기감지기에 많이 사용되고 있는 광원과 센서를 사용하여 광학챔버를 제작하였으며, UL 268에서 연기감지기를 시험할 때 사용되는 세 가지 화원(종이화원, 목재화원, 인화성 액체화원)을 대상으로 각 화원별 광학적 특징을 구하였다. 그 결과 종이화원과 목재화원은 산란에 큰 차이를 보였으며, 인화성 액체화원은 소광의 원인이 다름을 알 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.

• Bulletin of the Korean Chemical Society
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• 제35권4호
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• pp.1077-1081
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• 2014

Polyacrylamide (PAM) -HgS nanocomposites were successfully prepared in polyacrylamide (PAM) matrix. From TEM and XRD characterizations, the synthesized HgS nanocrystals were chain-like spherical in shape with a diameter of about 40-60 nm and high crystalline quality. The quantum-confined effect of HgS nanocrystals was confirmed by UV-vis diffuse reflection spectra. The optical properties of products were investigated by using photoluminescence (PL) spectra, which showed that HgS nanocrystals exhibited good optical properties with maximum emission peak at about 640 and 650 nm at different reaction temperatures. The interaction of HgS nanocrystals with PAM was studied through FT-IR spectroscopy and TG analysis, which suggested that $Hg^{2+}$ could interact with functional groups of PAM. The experimental results indicated that PAM not only induced nucleation, but also inhibited further growth of HgS crystals and play an important role in the formation of PAM/HgS nanocomposites. In addition, the possible mechanism of HgS nanoparticles growth in PAM solution was also discussed.

• 반도체디스플레이기술학회지
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• 제9권4호
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• pp.83-86
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• 2010

The transparent electrode properties of ITO films deposited by RF magnetron sputtering with process pressure were investigated. The ITO thin films was deposited on a glass substrate using a target with 3in diameter sintered at a ratio of $In_2O_3$ : $SnO_2$ (9 : 1). 200-nm-thick ITO thin films were manufactured by various process pressures ($2.0{\times}10^{-2}$, $7.0{\times}10^{-3}$ and $2.0{\times}10^{-3}$ Torr). The optical transmittance and resistivity of the deposited ITO thin films showed a relatively satisfactory result under $10^{-2}$ Torr. For high process pressure, the optical transmittance was below 80%, while for low process pressure, the optical transmittance was above 85%. As a result of of mobility, resistivity and carrier concentration by Hall measurement, we obtained satisfactory properties to apply into a transparent conducting thin film.

• Advances in nano research
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• 제3권2호
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• pp.81-96
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• 2015

Octahedral shaped single crystalline undoped and Ga-doped indium oxide nano-and microcrystals were fabricated using vapor-solid growth process. Effects of Ga doping on the crystallinity, defect structure, and optical properties of the nano-/microstructures have been studied using scanning electron microscopy, microRaman spectroscopy, transmission electron microscopy and cathodoluminescence spectroscopy. It has been observed that incorporation of Ga does not affect the morphology of $In_2O_3$ structures due to its smaller ionic radius, and similar oxidation state as that of In. However, incorporation of Ga in high concentration (~3.31 atom %) causes lattice compression, reduces optical band gap and defect induced CL emissions of $In_2O_3$ nano-/microcrystals. The single crystalline Ga-doped, $In_2O_3$ nano-/microcrystals with low defect contents are promising for optoelectronic applications.

• 한국세라믹학회지
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• 제35권11호
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• pp.1203-1211
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• 1998

적외선 광온도계(IR optical thermometer)와 PID 온도조절기에 의해 소성온도와 시간을 정밀하게 조절할 수 있는 마이크로파 소성장치를 사용하여 BaTiO3 시편을 소성하였다. 또한 마이크로파 소성중에 광섬유 온도계(optical fiber thermoneter)로 시편의 내부온도를 측정하여 같은 조건에서의 일반소성에 의한 시편과 소성특성을 비교한 결과, 소성시간에 따른 빠른 입성장속도과 큰 결정립경을 가졌으며, 온도에 따른 유전성질의 변화는 20~16$0^{\circ}C$의 측정범위에서 같은 경향을 보였다.

• 조명전기설비학회논문지
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• 제30권3호
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• pp.21-29
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• 2016

In this paper, optical tracking and analysis was carried out to find the optical properties with respect to various geometric design parameters of collimator lens which is very efficient when collect the light. As a result, a whole, ellipse incident part can obtain a high light efficiency and a narrow beam angle, and angled cylinder incident part is confirmed to obtain high efficiency and a narrow beam angle at a certain height or more. When Transmission part have a specific surface which can reflect the light in forward direction, a good optical properties was confirmed.

• 한국전기전자재료학회논문지
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• 제24권8호
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• pp.616-621
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• 2011

In this paper, CdS thin films, which were widely used window layer of the CdTe and the Cu(In,Ga)$Se_2$ thin film solar cell, were grown by chemical bath deposition, and effects of pH of reaction solution on the structural and optical properties were investigated. For pH<10.5, as the pH of reaction solution was higher, the deposition rate of CdS films was increased by improving ion-by-ion reaction in the substrate surface and the crystallinity of the films was improved. However, when the pH was higher than 10.5, the deposition rate was decreased because of smaller $Cd^{2+}$ ion concentration in the reaction solution. Also, the crystallinity of the films were deteriorated. The CdS films deposited at lower pH showed poor optical transmittance due to adsorbed colloidal particles, while the transmittance was improved for higher pH.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.320-320
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• 2007

Nowadays, ZnO thin films are investigated as transparent conductive electrodes for use in optoelectronics devices including flat displays, thin films transistors, solar cells because of their unique optical and electrical properties. For the use as transparent conductive electrodes, a film has to have low resistivity, high absorption in the ultra violent light region and high optical transmission in the visible region. Different technologies such as electron beam evaporation, chemical vapor deposition, laser evaporation, DC and RF magnetron sputtering and have been reported to produce thin films of ZnO with adequate performance for applications. However, highly transparent and conductive doped-ZnO thin films deposited by a metal-organic decomposition method have not been reported before. In this work, the effect of dopant concentration, heating treatment and annealing in areducing atmosphere on the structure, morphology, electrical and optical properties of ZnO thin films deposited on glass substrates by a Sol-gel method are investigated.