• Title, Summary, Keyword: VUV excitation

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.Improved Photoluminescence of $BaMgAl_{10}O_{17}:Mn$ Under VUV Excitation

  • Lee, Hyun-Woo;Jung, Kyeong-Youl;Yang, Young-Suk;Kang, Yun-Chan
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1083-1086
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    • 2004
  • We applied the spray pyrolysis technique to prepare Mn-doped $BaMgAl_{10}O_{17}$ (BAM) particles with high photoluminescence, which could be used in the plasma display device as a green phosphor. Several preparation conditions were investigated in order to tail the vacuum ultraviolet (VUV) characteristics. Some portions of barium were replaced with strontium to improve the luminescent intensity of BAM:Mn particles under VUV excitation. The content of Mn and Sr was optimized to obtain high luminescent efficiency under VUV excitation. Finally, the optimized BAM:Mn green particles showed higher photoluminescence intensity than that of commercial $Zn_2SiO_4$ and comparable with commercial barium-aluminate phosphor.

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Degradation of PDP Phosphors Under VUV Excitation (PDP 형광체의 진공 자외선 조사에 따른 열화 특성)

  • Lee, R.Y.;Lee, S.H.;KIm, Y.H.
    • Korean Journal of Materials Research
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    • v.12 no.9
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    • pp.735-739
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    • 2002
  • $(Y,Gd)BO_3$: Eu, $Zn_2$$SiO_4$ : Mn and $BaMgAl_{10}$ $O_{17}$ : Eu phosphors used in PDP were continuously irradiated by vacuum ultra violet generated from the penning gas (96%Ar+4%Xe) discharge and then the change of emitting intensity with time was investigated. The brightness of these phosphors decreased exponentially with VUV excitation time. The experimental data showed that the degradation rate increased in the order of $Zn_2$$SiO_4$ : Mn>(Y,Gd)$BO_3$: Eu>$BaMgAl_{10}$ $O_{17}$ : Eu phosphor. This different degradation property of phosphors was interpreted in terms of brightness saturation and stability against VUV irradiation. It was found that the degradation property of $(Y,Gd)BO_3$ : Eu red phosphor synthesized by ultrasonic thermal spray was superior to commercial phosphor.

Luminescence of $Eu^{3+}-doped\;GdCa_4B_3O_{10}$ phosphor under UV and VUV irradiation

  • Oh, Jae-Suk;Kwak, Chung-Heop;Jung, Ha-Kyun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1355-1359
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    • 2006
  • Due to its efficient red emission, $Eu^{3+}$ ion has been doped in various host materials. $GdCa_4B_3O_{10}:Eu^{3+}$ phosphor for red emission has been prepared by solid state reaction. Photoluminescence properties for the phosphor under UV and VUV excitation were investigated. The $GdCa_4B_3O_{10}:Eu^{3+}$ phosphor under both excitation conditions shows typical red emission spectrum centered at 611 nm with several weak peaks due to energy transfer from $^5D_O\;to\;^7F_J(J=1,2,3,4)$ of $Eu^{3+}$ ion. On the other hand, the activator content exhibiting the concentration quenching under UV and VUV irradiation is 10 mole% and 2.5 mole%, respectively.

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Optimization of VUV Characteristics of M3MgSi2O8:Eu2+ (M=Ca, Sr, Ba) Phosphor by Spray Pyrolysis (분무열분해법을 이용하여 M3MgSi2O8:Eu2+ (M=Ca, Sr, Ba) 형광체 분말의 VUV 특성 최적화)

  • Jung, You-Ri;Jung, Kyeong-Youl
    • Journal of Korean Powder Metallurgy Institute
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    • v.15 no.5
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    • pp.399-404
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    • 2008
  • Spray pyrolysis was applied to prepare $M_{3}MgSi_{2}O_{8}:Eu^{2+}$ (M=Ca, Sr, Ba) blue phosphor powder. The library of a Ca-Sr-Ba ternary system was obtained by a combinatorial method combined with the spray pyrolysis in order to optimize the luminescent property under vacuum ultraviolet (VUV) excitation. 10 potential compositions were chosen from the first screening. The emission shifted to longer wavelength as Ca became a dominant element and the emission intensity was greatly reduced in the composition region at which Ba is dominant element. On the base of the first screening result, the second fine tuning was carried out in order to optimize the luminescence intensity under VUV excitation. The optimal composition for the highest luminescence intensity was $(Ca_{1.7},\;Sr_{0.3},\;Ba_{1.0})Si_{2}O_{8}:Eu^{2+}$ which had the color coordinate of (0.152, 0.072) and about 64% emission intensity of $BaMgAl_{10}O_{17}$ (BAM) phosphor.

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.

Discharge Characteristics of Low Xe and High Xe Content in He-Ne-Xe Gas Mixture in PDP

  • Kwon, Oh-Yung;Bae, Hyun-Sook;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.366-368
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    • 2008
  • The discharge characteristics of He-Ne-Xe gas mixture with the variation of Xe content are investigated through the numerical simulation. VUV efficacy in the gas condition of low Xe content increases due to more excitation and the case of high Xe content shows the improvement of VUV efficacy with the increase of He content but decreased VUV efficacy after tthe He mixing ratio of He and Ne is 0.5 due to frequent ionization.

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A study on the application of dichroic mirror for the improvement of luminance and luminous efficacy in an AC Plasma Display Panel (AC-PDP의 휘도와 효율 향상을 위한 Dichroic Mirror의 응용에 관한 연구)

  • 송병무;김중균;황만수;황기웅
    • Journal of the Korean Vacuum Society
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    • v.10 no.1
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    • pp.98-103
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    • 2001
  • A new application of dirchroic mirror for the improvement of luminance and luminous efficacy in an AC-Plasma Display Panel (PDP) is suggested. Only about half of the Vacuum Ultraviolet (VUV) generated in the reflective PDP cell is used for the excitation of the phosphor. We are suggesting an idea of adopting a dichroic mirror which can reflect the VUV toward the phosphor which otherwise is absorbed by the front panel. The optical constants of the thin films of dirhroic mirror were determined from the photometric measurements through an iteration process of matching calculated and measured values of the reflectance and transmittance in the VUV wavelength region. From these results, we could design such a filter whose high reflection zone is centered at 147nm by a computer simulation accurately. The 147nm VUV is radiated from Xenon 3Pl state which is dominantly used to activate the phosphor in the PDP cell. The dichroic mirror was made with an electronbeam evaporator and its reflectance was measured by a reflectometer. We confirmed the usefulness of the dichroic mirror for the improvement of efficiency with experiments done by test panels. The panel with mirror shows improved luminance and luminous efficacy by 20∼30%.

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The Synthesis of (Y,Gd)$BO_3:Eu^{3+}$Phosphor by Ultrasonic Spray and Their Photoluminance Properties (초음파 분무에 의한 (Y,Gd)$BO_3:Eu^{3+}$ 형광체의 제조와 이의 발광 특성)

  • 김대수;김성우;이임렬
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.107-110
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    • 1999
  • The ultrasonic spray method was employed to make (Y,Gd)BO$_3$:Eu Phosphor, and its optical properties under 147nm VUV and 254 nm UV excitations were characterized and then compared with that produced by the solid-state reaction. The mixed solution of acetate hydrates of Y, Gd, Eu and boric acid diluted in water or methanol was used as the precursor fur the spray. It was found that (Y,Gd)BO$_3$:Eu phosphor made by this ultrasonic spray had a spherical shape and fine particle size of 1${\mu}{\textrm}{m}$. The crystalline structure for the as-sprayed phosphor was amorphous, but it converted into the same polycrystalline phase of solid state reaction after post heat treatment at 110$0^{\circ}C$ for 2hr. The emitting intensity under VUV and UV excitations for the spray-formed (Y,Gd)BO$_3$:Eu phosphor, however, was inferior to the later one. The excitation spectra were also studied and compared under VUV and UV excitations to explain the change of emitting intensity with Gd substitution in (Y$_{1-x}$ Gd$_{x}$)BO$_3$:Eu Phosphors made by spray and solid state reaction.on.

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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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