• Title/Summary/Keyword: optical transmittance

Search Result 525, Processing Time 0.093 seconds

Optical Transmittance Change of Pd Thin Film by Hydrogen Absorption and Desorption (수소 흡수-방출에 의한 Pd 박막의 광투과도 특성변화)

  • Cho, Young sin
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.12 no.4
    • /
    • pp.287-292
    • /
    • 2001
  • The optical transmittance change of Pd thin film due to hydrogen absorption and desorption was examined at room temperature. Hydrogen absorption and desorption cycling effects on optical transmittance were measured 6 times in the pressure range between 0 and 640 torr. Optical transmittance of Pd film was increasing with increasing hydrogen pressure. Ratio of optical transmittance to the change of pressure at $\beta$ phase is bigger than that of low hydrogen pressure range.

  • PDF

Optical Transmittance of PdHx Thin Film (PdHx 박막의 광투과도)

  • Cho, Young sin
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.12 no.3
    • /
    • pp.201-209
    • /
    • 2001
  • The change of optical transmittance of $PdH_x$ thin film due to hydrogen concentration change was measured at room temperature. Pd film($312{\AA}$ thick) was made by thermal evaporation on glass substrate. Hydrogen absorption and desorption cycling effect on optical transmittance was measured 4 times in the pressure range between 0 and 640 torr. Ratio of optical transmittance to the change of ln pressure(torr) increases with increasing number of hydrogen A-D cyclings in the ${\beta}$ phase.

  • PDF

OPTICAL EFFECTS OF NONMETALLIC POST AND CORE SYSTEMS ON ALL-CERAMIC CROWNS (비금속 포스트 코어가 전부도재관에 미치는 광학적인 영향)

  • Kim Sung-Won;Cho In-Ho;Lim Ju-Hwan;Lim Heon-Song
    • The Journal of Korean Academy of Prosthodontics
    • /
    • v.40 no.5
    • /
    • pp.493-506
    • /
    • 2002
  • Recently as the esthetic concerns about dental prosthesis have been increased, the nonmetallic post and core systems have been introduced clinically to improve the color and the low optical transmittance of conventional casting metal post and core systems. The purpose of this study was to compare and analyze the optical transmittance and the shade changes of all-ceramic crowns with two nonmetallic post and core systems. The experimental groups were classified as follows : Total 27 specimens(9 samples in each group) were evaluated. Group I : Natural teeth as a control group Group II : CosmoPost and $Empress^{(R)}$ core (Ivoclar-Vivadent, Liechtenstein) Group III : $LIGHT-POST^{TM}$ and $LIGHT-CORE^{TM}$ (Bisco, U.S.A.) In all group, all-ceramic crowns were fabricated with the same shade of IPS $Empress^{(R)}$ II (Ivoclar-Vivadent, Liechtenstein) after abutment preparation, and then two kinds of spectrophotometers, UV 3101 PC (Shimadzu, Japan) and CM 503i (Minolta Co. Ltd. Japan), were used to measure the optical transmittance and the color value. The following results were obtained : 1. The optical transmittance of each group without all-ceramic crowns, was siginificantly decreased in order of Group III, I and II (p<0.05). 2. The optical transmittance of each group with all-ceramic crowns cemented, were siginificantly decreased in order of Group I, II and III (p<0.05). 3. In comparison with the shade of all-ceramic crowns, there were no significant differences between groups regardless of the cementation. 4. In comparison with the shade changes in each group after the cementation of all-ceramic crowns, there were no significant differences between groups. From the above results, it is thought that the selection among materials used in this study doesn't influence greatly the esthetic restoration, because the differences of optical transmittance were so small that those were clinically insignificant.

Effects of ZnO addition on Electrical Resistivity and Optical Transmittance of ITO Thin Film (ITO 박막의 전기저항과 광투과도 특성에 미치는 ZnO 첨가 효과)

  • Chae, Hong-Choi;Hong, Joo-Wha
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.20 no.4
    • /
    • pp.367-373
    • /
    • 2007
  • [ $In_2O_3-ZnO(IZO)$ ] and $In_2O_3-ZnO-SnO_2(IZTO)$ thin films were prepared on EAGLE 2000 glass webs in a Ar gas by RF-Magnetron sputtering. Electrical resistivity and optical transmittance of the films were investigated. IZO, IZTO film showed excellent optical transmittance of 85 % at the visible $400{\sim}$780 nm wavelength. Electrical properties of IZO film have $6.50{\times}10^{-4}{\Omega}cm$ (95 $In_2O_3$ : 5 ZnO wt.%) and $5.20{\times}10^{-4}{\Omega}cm$ (90 : 10 wt.%), IZTO film have $8.00{\times}10^{-4}{\Omega}cm$ (90 $In_2O_3$ : 3 ZnO : 7 $SnO_2$ wt.%) and $6.50{\times}10^{-4}{\Omega}cm$ (90 : 7 : 3 wt.%). Substitution of SnO to ZnO in ITO films showed slightly lower electrical conductivity than ITO film but showed similar optical transmittance.

Optical transmittance property of PC, PET and PP films by ion implantation (이온주입에 의한 PC, PET, PP의 자외선 투과 특성)

  • Kim, Bo-Young;No, Yong-Oh;Lee, Jae-Sang;Lee, Jae-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.1104-1108
    • /
    • 2004
  • A Study has been made of surface modification of various polymers by ion implantation to change the optical transmittance property at ultraviolet ray (UV, $200\sim400nm$). The substrates were PC (Polycarbonate), PET(Polyethyleneteraphtalate) and PP (Polypropylene). The effects of ion implantation on the change of optical transmittance were investigated in relation to ion species, implantation energies and ion fluences. The N, Ar, Kr, Xe ion implantation performed at ion energies from 20 to 50keV. The fluences ranged from $5\times10^{15}$ to $7\times10^{16}ions/cm^2$. UV/Vis transmittance spectroscopy, FT-IR and XPS were used to investigate optical transmittance, chemical structure and surface chemical state of irradiated polymer. Surface color was changed from the yellow to the dark brown and the transmittance of UV ray in the range UV-A($320\sim400nm$) decreased more than 80% after ion implantation.

  • PDF

Optical Transmittance of Polybenzoxazole Precursor (폴리벤조옥사졸 전구체의 광투과도 연구)

  • 김대겸;김종화;최길영;오재민;이무영;박동원;이광섭;진문영
    • Polymer(Korea)
    • /
    • v.26 no.1
    • /
    • pp.18-27
    • /
    • 2002
  • Poly(ο-hydroxyamide)s as polybenzoxazoles precursors were synthesized by polycondensation from 2,2'-bis(3-amino-4-hydroxyphenyl) hexafluoropropane and various bis-acids. And the polymers were modified to acid-sensitive polyamides by introducing tetrahydropyran in order to impart photosensitivity. A study of optical transmittance at 365 nm, according to the chemical structure of bis-acid, revealed that the polymer derived from 4,4'-oxydibenzoic acid showed better optical transparency than those from other bis-acids. This tendency of optical transmittance could be explained by formation of charge transfer complex. In case of the polymer derived from 4,4'-oxydibenzoic acid, the electron accepting characteristic of bis-acid is reduced by introduction of electron donating group, -O-. Thus, optical transmittance increased due to the diminished formation of intramolecular charge transfer complex. In addition, the optical transmittance increased with increasing the THP content in the polymer. This is attributed to the reduced intermolecular interaction by the loosening of the packing density of the polymer chain.

Optical Transmittance Variation to Thickness of Nickel Thin Films (니켈박막의 두께에 따른 광투과율변화)

  • Yang, Ki-Won;Son, Jeong-Sik;Kwak, Ho-Weon;Lee, Haeng Ki;Park, Sang Chul
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.13 no.1
    • /
    • pp.49-52
    • /
    • 2008
  • To study the optical transmittance through nickel thin films with various thicknesses. Methods: We measured the optical transmittance through thin nickel film with various thicknesses. Results: The thickness dependence of the optical transmittance through nickel thin films deposited by thermal evaporation had been investigated. The optical transmittance rapidly decreased with the Ni film thickness less than 70 nm while it slightly decreased with the thickness more than 70 nm. In the experiment of optical dispersion, most of the light transmitted in the incidence direction. The result of experiment showed that optical dispersion was negligibly. Conclusions: Optical transmittance exponentially decreased as nickel thin film thickness increased.

  • PDF

Properties of ITO thin films deposited by RF magnetron sputtering with process pressure (RF 마그네트론 스퍼터링법으로 제작된 ITO 박막의 공정압력 변화에 따른 특성)

  • Jeong, Seong-Jin;Kim, Deok-Kyu;Kim, Hong-Bae
    • Journal of the Semiconductor & Display Technology
    • /
    • v.9 no.4
    • /
    • pp.83-86
    • /
    • 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.

Effect of Electron Irradiation on the Structural Electrical and Optical Properties of ITO/ZnO Thin Films (전자빔 조사에너지에 따른 ITO/ZnO 적층박막의 구조적, 전기적, 광학적 특성 변화)

  • Kim, Sun-Kyung;Kim, Daeil
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.27 no.5
    • /
    • pp.225-229
    • /
    • 2014
  • The influence of electron irradiation energy(eV) on the structural, electrical and optical properties of ITO/ZnO bi-layered films prepared with RF magnetron sputtering has been investigated. The ITO/ZnO show the lowest resistivity of $2.8{\times}10^{-4}{\Omega}cm$. The optical transmittance in a visible wave length region also increased with the electron irradiation energy. The film irradiated at 900 eV shows 82---- of optical transmittance in this study. By comparison of figure of merit, it was observed the optical transmittance and electrical resistivity of the films were dependent on the electron irradiation energy and optoelectrical performance of ITO/ZnO film is improved with electron irradiation.

An improved electrode structure of the Patterned Vertical Alignment Liquid Crystal Cell for high optical property

  • Choi, Yong-Hyun;Son, Jung-Hee;Yang, Jin-Seok;Ji, Seung-Hoon;Lee, Gi-Dong
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • /
    • pp.502-505
    • /
    • 2007
  • In this paper we propose a novel electrode structure for high transmittance in the Patterned Vertical Alignment (PVA) LC cell. Normally, the transmittance of PVA LC cell is depended on the shape of the electrode and cell gap. We studied the area decreasing the transmittance through the electrode structure for wide viewing angle and proposed new electrode design to change LC director configuration in the area. We use the 'TechWiz LCD' for calculation of the director configuration and optical characteristics. We show the comparison of the calculated optical transmittance between the conventional PVA mode and the proposed PVA mode. From the results, we confirm that the optical transmittance of the proposed structure of the PVA cell becomes higher.

  • PDF