• Title/Summary/Keyword: VUV

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Plasma and VUV Pretreatments of Polymer Surfaces for Adhesion Promotion of Electroless Ni or Cu Films

  • Romand, M.;Charbonnier, M.;Goepfert, Y.
    • Journal of Adhesion and Interface
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    • v.4 no.2
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    • pp.10-20
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    • 2003
  • This paper is relative to the electroless deposition of nickel or copper films on polyimide and polytetrafluoroethylene substrates. First, it is presented an original approach of the electroless process which consists in grafting nitrogenated functionalities on the polymer surfaces via plasma or VUV-assisted treatments operating in a nitrogen-based atmosphere ($NH_3$, $N_2$), and then in catalysing the grafted surfaces in an aqueous tin-free, Pd(+2)-based solution. Adhesion of the Pd(+2) catalytic species on polymer surfaces is explained by the formation of strong covalent bonds between these species and the grafted nitrogenated groups. Second, it is show how a fragmentation test performed in conjunction with electrical measurements can be used to characterize the practical adhesion of the electroless coatings deposited on flexible polymer substrates, and to evidence the influence of some experimental parameters (plasma treatment time and nature of the gas phase).

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N(2D) Product Velocity Mapped Imaging in the VUV Photolysis of Nitrous Oxide at 118.2 nm

  • Cosofret, Bogdan R.;Lambert, H. Mark;Houston, Paul L.
    • Bulletin of the Korean Chemical Society
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    • v.23 no.2
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    • pp.179-183
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    • 2002
  • Resonance-enhanced multiphoton ionization with time-of-flight product imaging of the $N(^2D)$ atoms has been used to study the $N_2O$ photodissociation at 118.2 nm and the two-photon dissociation at 268.9 nm. These imaging experiments allowed the determination of the total kinetic energy distribution of the $NO(X^2{\prod})$ and $N(^2D_{5/2})$ products. The $NO(X^2{\prod})$ fragments resulting from the photodissociation processes are produced in highly vibrationally excited states. The two-photon photodissociation process yields a broad $NO(X^2{\prod})$ vibrational energy distribution, while the 118.2 nm dissociation appears to produce a vibrational distribution sharply peaked at $NO(X^2{\prod},\;{\nu}=14)$.

The dependence of the electrical characteristics of MgO on temperature in an AC PDP

  • Ha, Chang-Hoon;Jeong, Dong-Chul;Kim, Joong-Kyun;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.714-716
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    • 2005
  • We studied the dependence of the electrical characteristics of MgO protecting layer on temperature in an AC PDP cell. Careful measurements of the surface resistance of MgO were performed for the temperature range from room temperature to $100^{\circ}C$ with and without the VUV illumination. Experimental results show that the resistivity is affected by not only the temperature but also VUV irradiation. The measurement of wall charge distribution and the address discharge delay time as to the temperature show that the resistivity change of MgO may affect the wall voltage and consequently the discharge delay time.

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Synthesis and Optical Characteristics of Green-Emitting (Mg,Zn)$Al_2O_4:Mn^{2+}$ Phosphor for 3D- PDP Applications

  • Han, Bo-Yong;Yoo, Jae-Soo;Heo, Eun-Gi;Yoo, Young-Gil
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.272-275
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    • 2009
  • A new green phosphor, ($Mg_{1-x-yZnx)$)$Al_2O_4:Mn^{2+}{_y}$ (0 x 0.6, 0.001 y 0.01), was synthesized by a flux-assisted solid reaction and its vacuum ultraviolet (VUV) excitation and emission characteristics were examined in this study. The chromaticity and peak intensity of the $(Mg_{0.79}Zn_{0.2})Al_2O_4:Mn^{2+}{_{0.01}}$ (x = 0.177, y = 0.745) phosphor were found to be more desirable than that of $Zn_2SiO_4:Mn^{2+}$ (x = 0.216, y = 0.72) phosphor as a green primary color.

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Analysis of Energy Flow and Barrier Rib Height Effect using Ray-Optics Incorporated Three-dimensional PDP Cell Simulation

  • Chung, Woo-Joon;Jeong, Dong-Cheol;Whang, Ki-Woon;Park, Jae-Hyeung;Lee, Byoung-Ho
    • Journal of Information Display
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    • v.2 no.4
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    • pp.46-51
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    • 2001
  • Using ray-optics code incorporated with three-dimensional PDP cell simulation, we have analysed the energy flow in the PDP cell from the electric power input to the visible light output. Also, the visible light output profile and viewing angle distribution were obtained. We applied our code to the analysis of the barrier rib height effect on the visible light luminance and efficiency of the sustaining discharge. Although cells with higher barrier rib generate more VUV photons, less ratio of visible photons are emitted toward front panel due to the shadow effect. Thus, there exists optimal barrier rib height giving the highest visible luminance and efficiency. This kind of code can be a powerful tool in designing cell geometry.

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Synthesis, photoluminescence and thermal properties of laponite-X (X = Eu, Tb) phosphors (라포나이트-X(X = Eu, Tb) 형광체의 합성 및 열적 안정성과 발광특성 연구)

  • Kim, Pyo-Ra;Son, Dong-Min;Lee, Han-Na;Kim, You-Hyuk
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.19 no.4
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    • pp.196-201
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    • 2009
  • In order to give emission functionality for laponite the laponite-X (x = Eu, Tb) phosphors were prepared by calcination of cryogels which were prepared through Na ion exchange reaction with Eu and Tb ions. Thermal stability and emission properties of new laponite-X (X = Eu, Tb) phosphors were investigated by X-ray diffractormeter and UV/VUV spectrofluorometer. The phosphors were stable around up to $600^{\circ}C$ and new crystalline phases were observed at $700^{\circ}C$. Red and green emissions of phosphors under UV/VUV excitation were also identified at $300^{\circ}C$ and $500^{\circ}C$ as emission peaks of $Eu^{3+}$ and $Tb^{3+}$, respectively.

Influence of gas mixture He-Ne-Xe on the vacuum ultraviolet intensity in ac-PDPs.

  • Yoo, N.L.;Jung, K.B.;Lee, J.H.;Lee, S.B.;Han, Y.K.;Jeong, S.H.;Lee, H.J.;Son, C.G.;Lim, J.E.;Oh, P.Y.;Moon, M.W.;Jeoung, J.M.;Ko, B.D.;Cho, G.S.;Uhm, H.S.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1221-1224
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    • 2005
  • The improvement of luminance and luminous efficiency is the one of the most important parts in AC-PDPs. To achieve high luminance and luminous efficiency, high VUV emission efficiency is needed. We measured the emission spectra of the vacuum ultraviolet(VUV) rays in surface discharge AC-PDP with ternary gas mixture of He-Ne-Xe. The influence of He-Ne-Xe gas-mixture ratio on excited $Xe^{\ast}$ resonant atoms and $Xe_2\;^{\ast}$ dimers has been investigated. It is found that luminous efficiency of ternary gas mixture, He-Ne-Xe, is shown to be much higher than that of binary gas mixture of Ne-Xe. For improving discharge luminous efficiency, we have studied VUV emission characteristics of ternary gas mixture, He(50%)-Ne-Xe and He(70%)-Ne-Xe with Xe concentration and filling gas pressure.

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Synthesis of (Gd0.74Y0.11Tb0.15P1.15)OδPhosphors Using Combinatorial Chemistry (조합화학을 이용한 (Gd0.74Y0.11Tb0.15P1.15)Oδ 형광체 합성 및 발광특성)

  • 이재문;유정곤;박덕현;김지식;손기선
    • Journal of the Korean Ceramic Society
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    • v.41 no.5
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    • pp.381-387
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    • 2004
  • Recently developed Plasma Display Panels (PDP) require phosphors of high luminance at Vacuum Ultraviolet (VUV) excitation. The present investigation developed new PDP phosphors using combinatorial chemistry method. We applied T $b^{3+}$ -activated yttrium gadolinium phosphates system to our combinatorial fine-tuning technique. As a result, the optimum composition was determined to be (G $d_{0.74}$ $Y_{0.11}$T $b_{0.15}$) $P_{1.15}$ $O_{\delta}$ through the two-step combinatorial screening process including excess phosphorous and Gd replacement. We found that the sample of the optimum composition shows a higher luminescence efficiency at VUV excitation and a shorter decay time than the commercially available Z $n_2$ $SiO_4$:Mn phosphor.