• Title/Summary/Keyword: VUV

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A Study on the Characteristics on a Discharge Cell by the Electrode Gap Using 2-D Simulation (2차원 시뮬레이션을 이용한 전극 간격에 따른 방전셀 내부의 특성 연구)

  • Lee, Don-Kyu
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.524-528
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    • 2019
  • Although different types of discharge cells exist, in common it is the primary goal for all discharge cells to have lower drive voltages and higher efficiency characteristics. To improve these factors, many studies are conducted that prolong the discharge path inside the discharge cell or change the composition of the working gas. In this paper, the two-dimensional fluid simulation was used to calculate the discharge voltage (firing voltage and sustain voltage) and the change in luminance and luminous efficacy according to the change in gap distance between discharge electrodes. In addition, we looked at changes in various charged particles, exciting particles and VUV particles, and studied the causes of the resulting values.

Synthesis and Luminescent Properties of Y(As, Nb, P, V)O4:Eu3+ Red Phosphors by Combinatorial Chemistry Method (조합화학을 이용한 Y(As, Nb, P, V)O4:Eu3+ 적색형광체의 합성 및 광 특성 분석)

  • Jeon, Il Un;Son, Gi Seon;Park, Hui Dong;Ryu, Seung Gon
    • Journal of the Korean Chemical Society
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    • v.45 no.6
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    • pp.577-588
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    • 2001
  • Eu doped YRO$_4$ (R=As, Nb, P, V) red phosphors were prepared by the combinatorial chemistry method. The quaternary material library of tetrahedron-type composition array was designed to investigate the luminescence of the host material under UV and VUV excitations (254, 147 nm). The photoluminescent characteristics of the samples were comparable to the commercially available red phosphors such as (Y, Gd)BO$_3$: $Eu^{3+}$ and Y$_2$O$_3$: In view of the luminescence yield, V rich region was found to be optimum under UV excitation. But the results under VUV excitation were different from those of UV excitation, the samples of the composition containing a large amount of P shows the highest luminescence. Especially, higher luminescence was obtained in $Y_{0.9}$(A$S_{0.06}$N$B_{0.06}P_{0.83}V_{0.06}$) O$_4$: $Eu_{0.1}$ phosphors than commercial (Y, Gd)BO$_3$red phosphors under 147 nm excitation.

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The Photoluminance Properties of Blue Phosphor with Chemical Composition in BaO-MgO-$Al_2O_3$ System (BaO-MgO-$Al_2O_3$계에서 조성변화에 따른 청색 형광체의 발광특성)

  • Park, Sang-Hyun;Kong, Myung-Sun;Lee, Rhim-Youl
    • Korean Journal of Materials Research
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    • v.8 no.6
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    • pp.520-525
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    • 1998
  • The optical properties with chemical composition change in BaO- MgO-$AI_2O_3$, system activated by divalent Eu ion were investigated under 254nm ultraviolet(UV) and 147nm vacuum ultraviolet(VUV). These phosphors emitted a blue light at a dominant wavelength of $\lambda$=445nm under UV and VUV irradiations. It was found that the brightness of $BaMgAI_{14}O_{23}$ phosphor increased with Eu concentration up to 10% under UV but it showed a maximum emitting intensity at 5% Eu for VUV. The emitting intensity of blue color of $BaMgAl_{10}O_{l7}$ phosphor was higher than that of $BaMgAI_{14}O_{23}$for both excitation. A further improvement in brightness was obtained for $Ba_{o.9}Ca_{0.1}MaAl_{14}O_{23}$ and $Ba_{0.9}Sr_{0.1}MgAl_{10}O_{17}$ phosphor synthesized by the substition of $Ba^{+2}$ ion with O.lmole of $Ca^{+2}$ or $Sr^{+2}$ ions in $BaMgAl_{IO}O_{17}$: Eu phosphor.

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Vacuum ultraviolet emission characteristics of binary and ternary gas mixtures with xenon concentration and gas pressure in AC-PDPs (AC-PDP에서 Ne-Xe의 2원 혼합기체와 He-Ne-Xe의 3원 혼합기체의 Xe 혼합비와 가스 압력에 따른 VUV 발광 특성)

  • 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.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.05a
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    • pp.142-145
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    • 2005
  • AC-PDP에서 발광 휘도와 발광 효율의 개선은 매우 중요한 과제중의 하나이다. 높은 발광 휘도와 발광 효율을 위해선 VUV의 높은 발광 효율이 요구되어진다. 이 실험에서는 AC-PDP에서 Ne-Xe의 2원 혼합기체와 He-Ne-Xe의 3원 혼합기체의 VUV 발광 세기를 측정하였다. 기체 압력은 200 Torr, 300 Torr, 400 Torr, 500 Torr로 유지하였고, Xe 혼합비는 1%, 2%, 4%, 7%, 10%, 15%를 사용하였다. 진공자외선 발광 세기는 He-Ne-Xe의 3원 혼합기체가 Ne-Xe의 2원 혼합기체보다 발광 세기가 훨씬 높다는 것을 알 수 있었다. 그리고 Xe 함량이 증가함에 따라 공명선인 147 nm의 발광 세기는 Xe 혼합비가 약 10%까지는 증가하다가 10% 이후에는 포화되고, 반면 분자선인 173 nm은 Xe 함량과 가스 압력이 증가함에 따라 발광 세기가 증가하였다.

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Comparison Analysis on Characteristics and Components of Various Waste Plastic Pyrolysis Oils by Vacuum Distillation Method (감압증류를 통해 분획된 폐플라스틱 열분해유의 특성평가와 구성성분 비교분석 연구)

  • Hwayeon Jeon;Cheol Hwan Jeon;Sung Joon Park;Jae Woo Lee;Jae-kon Kim
    • Clean Technology
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    • v.29 no.4
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    • pp.262-271
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    • 2023
  • Globally, the amount of waste plastics has been occurring to environmental problems. As a result, it is necessary to research methods that utilize waste plastic pyrolysis oil (WPPO) produced by pyrolysis. One such method being studied is utilizing WPPO as a naphtha feedstock. In this study, five types of WPPO were analyzed to determine whether they can be used as raw materials for naphtha. Because of their wide boiling point range, the WPPOs were fractionated into light and heavy fractions through vacuum distillation, and the separation and purification techniques were analyzed using GC-VUV to determine the content of paraffin, olefin, and other compounds. All WPPOs showed high olefin content regardless of the source and fraction. Aromatic and paraffin content varied depending on the source, and oxygen and other compounds also varied significantly by source and fraction. In addition, the light fraction showed a carbon distribution similar to that of naphtha, whereas the heavy fraction showed a carbon distribution of C11 ~ C14. In conclusion, additional processes and raw material selection are required to utilize waste plastic pyrolysis oil as a raw material for naphtha.

AC PDP(Plasma Display Panel)의 방전 특성 해석

  • 황기웅;정희섭;서정현
    • Proceedings of the Korean Vacuum Society Conference
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    • 1997.07a
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    • pp.173-176
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    • 1997
  • A numerical analysis of the micro-discharge in an AC pplasma dispplay cell has been made using time-deppendent, 2-dimensional multi-fluid equations to understand the discharge pphysics of He-Xe discharge. The time deppendent distribution of the electron tempperature, densities of electrons, various ions and excited sppecies, and the effects fo the wall charge accumulated on the dielectric surface are obtained and comppared with the results of direct observation of time deppendent behavior of VUV and visible sppectra from single discharge cell observed using a gated, image intensified CCD to elucidate the discharge physics.

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High efficacy PDP

  • Oversluizen, G.;Dekker, T.;Gillies, M. F.;Zwart, S.T. de
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.339-342
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    • 2003
  • Main PDP panel efficacy improvement factors are discussed. A large panel efficacy improvement can be obtained through a combination of discharge efficiency improvement and phosphor improvement. Important design elements are a high Xe-content gas mixture, the application of a $TiO_2-layer$, and a new green phosphor with little saturation at high VUV-load. In a 4-inch color test panel with a conventional stripe-type cell configuration a white efficacy of 4.4 lm/W and a luminance of 5000 $cd/m^2$ is obtained for sustaining at 250V in addressed condition.

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Phosphors development for LED and PDP Applications

  • Park, Hee-Dong
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.368-369
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    • 2003
  • The recent development of InGaN-based white light emitting diodes (LEDs) has expanded their potential applications in areas such as white electric home appliances, backlight for mobile phone or notebook PC, and indoor lightings. In this lecture, recent researches related to the phosphors for LEDs applications and their luminescent properties were reviewed. PDPs are considered as the most potential flat panel displays with a large-screen size. Phosphors in PDPs directly affect the brightness and lifetime. So, many researchers have tried to improve the luminescence characteristics of the phosphors especially under vacuum ultraviolet (VUV) excitation. We overviewed recent research trends and conclusive achievements for the PDP phosphors.

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Gas dischage Simulation for Color Plasma Display Panel and Measurement of VUV (Vacuum UltraViolet) (칼라 플라즈마 디스플레이 패널용 혼합 가스 최적화 시뮬레이션 및 진공 자외선 측정)

  • Park, Hun-Gun;Lee, Seok-Hyun
    • Proceedings of the KIEE Conference
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    • 1997.07e
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    • pp.1666-1668
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    • 1997
  • This paper reports the optimal gas mixing ratio for color plasma display panel to improve luminous efficiency using gas dischage simulation which contains energy equation. We verified a simulation by measuring vacuum ultraviolet. The luminous efficiency has improved considerably(about 30%) by adding Ar (0.5%), compared with Ne-Xe(4%) mixing gas.

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Toward Efficacy Improvement in a PDP Discharge Cell from Structural Considerations

  • Tachibana, Kunihide
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.20-23
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    • 2009
  • The efficacy improvement issues in a unit discharge cell have been approached from the structural considerations. The tested cell designs include (a) a coplanar type with annular auxiliary electrode buried in barrier ribs, (b) a coplanar type with split auxiliary electrodes also burred in barrier ribs and (c) a coaxial type with a floating electrode stacked on the base electrode. From spatiotemporally resolved optical images of near-IR emission taken by a gated-ICCD camera and relative VUV emission intensity estimated by laser absorption spectroscopy, the differences in the discharge and light emission performances of those three cell types have been compared and discussed.

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