• Title/Summary/Keyword: PDP phosphor

Search Result 102, Processing Time 0.024 seconds

Search for Phosphors for Use in Displays and Lightings using Heuristics-based Combinatorial Materials Science

  • Sharma, Asish Kumar;Sohn, Kee-Sun
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.207-210
    • /
    • 2009
  • According to the recent demand for materials for use in various displays and solid state lightings, new phosphors with improved performance have been pursued consistently. Multi objective genetic algorithm assisted combinatorial material search (MOGACMS) strategies have been applied to various multi-compositional inorganic systems to search for new phosphors and to optimize the properties of phosphors.

  • PDF

Spherical-shaped Zn2SiO4:Mn Phosphor Particles with Gd3+/Li+ Codopant (Gd3+/Li+ 부활성제가 첨가된 구형의 Zn2SiO4:Mn 형광체 입자)

  • Roh, Hyun Sook;Lee, Chang Hee;Yoon, Ho Shin;Kang, Yun Chan;Park, Hee Dong;Park, Seung Bin
    • Korean Chemical Engineering Research
    • /
    • v.40 no.6
    • /
    • pp.752-756
    • /
    • 2002
  • Green-emitting $Zn_2SiO_4:Mn$ phosphors for PDP(Plasma Display Panel) application were synthesized by colloidal seed-assisted spray pyrolysis process. The codoping with $Gd^{3+}/Li^+$, which replaces $Si^{4+}$ site in the willemite structure, was performed to improve the luminous properties of the $Zn_2SiO_4:Mn$ phosphors. The particles prepared by spray pyrolysis process using fumed silica colloidal solution had a spherical shape, small particle size, narrow size distribution, and non-aggregation characteristics. The $Gd^{3+}/Li^+$ codoping amount affected the luminous characteristics of $Zn_2SiO_4:Mn$ phosphors. The codoping with proper amounts of $Gd^{3+}/Li^+$ improved both the photoluminescence efficiency and decay time of $Zn_2SiO_4:Mn$ phosphor particles. In spray pyrolysis, the post-treatment temperature is another factor controlling the luminous performance of $Zn_2SiO_4:Mn$ phosphors. The $Zn_{1.9}SiO_4:Mn_{0.1}$ phosphor particles containing 0.1 mol% $Gd^{3+}/Li^+$ co-dopant had a 5% higher PL intensity than the commercial product and 5.7 ms decay time after post-treatment at $1,145^{\circ}C$.

Screening of Eu3+-and Tb3+-Activated Phosphors for PDP in the System of CaO-Gd2O3-Al2O3 (CaO-Gd2O3-Al2O3계에서의 PDP용 Eu3+와 Tb3+ 활성 형광체의 탐색)

  • Park, Sang-Mi;Kim, Chang-Hae;Park, Hui-Dong;Jang, Ho-Gyeom;Park, Jun-Taek
    • Journal of the Korean Chemical Society
    • /
    • v.46 no.4
    • /
    • pp.336-345
    • /
    • 2002
  • In this study, we have screened $Eu^{3+}$- and $Tb^{3+}$-activated candidate phosphors for PDP in the sys-tems of CaO-Gd$_2$O$_3$-Al$_2$O$_3$ by combinatorial chemistry and investigated the synthetic temperature, optimum com-position and luminescent properties about the candidate phosphors. To construct the emission intensity library by VUV PL, we have synthesized 210 different compositional samples using a polymerized-complex method. Good luminescent samples were identified by X-ray diffraction method. $Ca_$\alpha$$G$d_{0.95-$\alpha$-$\beta$}Al_$\beta$O_$\delta$$ : Eu(0.02< $\alpha$+$\beta$ <0.04) phos-phors screened as a red phosphor have good color purity than commercial phosphor. In the candidate phosphors of CaGdAl$_3O_7$ : Tb, Ca$Al_{12}O_{19}$ : Tb, Gd$_4$Al$_2O_9$ : Tb, and Gd$_3Al_5O_{12}$ : Tb CaGdAl$_3O_7$ : Tb, and Ca$Al_{12}O_{19}$ : Tb have shorter decay time than commercial phosphor.

Influence of Sustaining Frequency on the luminous Efficiency in AC-PDP (교류형 플라즈마 디스플레이에 있어서 유지방전 주파수에 따른 발광 효율에 미치는 영향)

  • 정의선;김대일
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.14 no.6
    • /
    • pp.1-5
    • /
    • 2000
  • Recently alternating-current Plasma Display Panel(AC-PDP) is in the spotlight as a digital television and high definition television. The panel structure widely adapted in commercial AC-PDP is three electrodes surface discharge type. At present time, the luminous efficiency is around 1lm/W, it should be a key factor for the commercialization. For the high luminous efficiency, the development of panel structure is necessary. At a given panel structure, a driving method should be optimized to get a sufficient luminous efficiency. The display image of AC-PDP could be realized by the repeated light emission from the discharge. Because most of discharge power is consumed in the sustaining period, the optimization of sustaining waveform is very important for the high luminous efficiency. ADS (Address and Display period Separated) driving method is commonly used. The average driving frequency of ADS driving method is ranged by several tens kilo of [kHz], however the actual frequency of sustaining period is in range of 100[kHz] to 200[kHz]. Based on this study, when the phosphor emits the visible light, it has a decay time of few milliseconds due to the material transfer to the phosphor to emit the visible light. Consequently the luminous efficiency decreases in proportion to the driving frequency. It is found that the luminous efficiency could be significantly improved by the low frequency sustaining driving method.

  • PDF

Synthesis of Zn2SiO4 : Mn Phosphor Particles by Spray-pyrolysis Method (분무 열 분해법을 이용한 Zn2SiO4 : Mn 나노 형광체의 광학적 특성에 관한 연구)

  • Nam, Sang-Hun;Kim, Myoung-Hwa;Lee, Sang-Duck;Boo, Jin-Hyo
    • Journal of the Korean Vacuum Society
    • /
    • v.19 no.1
    • /
    • pp.66-71
    • /
    • 2010
  • Spherical shape $Zn_2SiO_4:Mn$ phosphor particles with the mean particle size from submicron to micron sizes were prepared by ultrasonic spray pyrolysis method. A droplet separator was introduced to control the size distribution of the phosphor particles with spherical shape. The $Zn_2SiO_4:Mn$ phosphor particles with 2 mol% doping concentration of manganese have decay time and have photoluminescence intensities comparable with those of the latest commercial product prepared by the solid state reaction method. The size of the phosphor particles was decreased from 1 to 0.2 micrometers as the inorganic salt solution concentration was changed from 0 to 5 M. The phosphor particles prepared from the solutions above 0.5 M have photoluminescence intensities comparable with that of the latest commercial product.

Photoluminescence Characteristics of Spherical-Shaped LaPO4:Tb Phosphor Particles Prepared by Spray Pyrolysis (분무열분해법에 의해 제조된 구형의 녹색 LaPO4:Tb 형광체의 발광특성)

  • Lee, Kyo-Kwang;Kang, Yun-Chan;Zeon, Il-Woon;Jung, Kyeong-Youl;Park, Hee-Dong
    • Korean Journal of Materials Research
    • /
    • v.12 no.9
    • /
    • pp.761-766
    • /
    • 2002
  • Fine $LaPO_4$:Tb phosphor particles with spherical shape were prepared by spray pyrolysis. The influence of the precursor type of phosphorous such as ($NH_4$)$_2$$HPO_4$, $NH_4$$H_2$$PO_4$, ($NH_4$)$_3$$PO_4$ and $H_3$$PO_4$ on the morphology and brightness of particles was investigated. As-prepared particles by spray pyrolysis had spherical shape when ($NH_4$)$_2$ $HPO_4$ and $NH_4$$H_2$$PO_4$ were used as the precursor of phosphorous. The precursor type of phosphorous affected the photoluminescence intensity of $LaPO_4$:Tb phosphor particles, but not significant. With changing the content of activator(Tb) and excess of phosphorous, the optimal composition giving the highest photoluminescence intensity was found. The spherical morphology of prepared $LaPO_4$:Tb particles was completely maintained even after the posttreatment up to $1050^{\circ}C$. When the posttreatment temperature was over $1100^{\circ}C$, the particles did not have the spherical shape anymore. However, the highest photoluminescence intensity of prepared $LaPO_4$:Tb particles was obtained at $1050^{\circ}C$. The photoluminescence characteristics of prepared $_LaPO4$:Tb under the vacuum ultraviolet(VUV) illumination was comparable with that of the commercial $Zn_2$$V_4$:Mn and (La,Ce)PO$_4$:Tb phosphor particles. At the optimal condition, the decay time of prepared spherical $LaPO_4$:Tb phosphor particles was about 6.8ms.

Analysis of Cross-Section Shape Slope of Pillar for Vacuum Glazing according to the Screen Printing Parameters (스크린 인쇄 공정 변수에 따른 진공유리용 필러의 단면형상 기울기 분석)

  • Kim, Jae Kyung;Jeon, Euy Sik
    • Journal of the Semiconductor & Display Technology
    • /
    • v.11 no.4
    • /
    • pp.43-48
    • /
    • 2012
  • The screen printing method is much used in the flat panel display field including the LCD, PDP, FED, organic EL, and etc. for forming the high precision micro-pattern. Also A number of studies of screen printing method has been conducted as the method for the cost down through the improvement of productivity. Because of being the dot printing method of the cylindrical shape not being the line printing method like the existing PDP barrier rib and phosphor, the pillar arrays using the screen printing method is deposited in the hemispherical type not being cylindrical shape in the existing printing process conditions. In this paper, the parameters were set on the screen printing device in order to deposit the cross-sectional shape with the cone or trapezoid shape of the pillar in depositing the pillars used the screen printing device for vacuum glazing. The cross-sectional shape slope of the pillar according to the parameters was measured. And analysis the effect of the screen printing process conditions on the cross-sectional shape slope of pillars based upon the result of being measured. The processing conditions were drawn to minimize the cross-sectional shape slope of pillar.

High Efficacy Plasma Display Utilizing Macro Discharge Cell Structure with Long Electrodes Gap (Long Electrode Gap을 가진 Macro Cell에서의 고효율 PDP 특성 연구)

  • Kim, Min-Tae;Heo, Jun;Kim, Yun-Gi;Kim, Dong-Hyun;Lee, Hea-June;Lee, Ho-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.9
    • /
    • pp.1314-1318
    • /
    • 2012
  • Recently, applications of plasma display to the large public display and transparent display gain much attention. With this background, we report characteristics of opposite electrodes discharge cell with long electrode gap in comparison with conventional co-planar surface discharge. The cell size of test panel is $2950{\mu}m{\times}840{\mu}m$, which corresponds to that of the display having diagonal size of 130" with XGA resolution. Electrode gap of co-planar and opposite electrode structure are $240{\mu}m$ and $500{\mu}m$ respectively. These gap dimensions provide similar driving voltage windows. Experimental results show that opposite discharge provides approximately four fold higher luminous efficacy compared with that of the surface discharge. Resulting efficacy is found to be higher than 19 lm/W in green phosphor with 10 KHz continuous pulse operation.

High Luminance $Zn_2$$SiO_4$:Mn Phosphors for in PDP Application (고상법에 의한 PDP용 고휘도 $Zn_2$$SiO_4$:Mn 형광체 제조)

  • Jeon, Il-Un;Son, Gi-Seon;Jeong, Yang-Seon;Kim, Chang-Hae;Park, Hui-Dong
    • Korean Journal of Materials Research
    • /
    • v.11 no.3
    • /
    • pp.227-235
    • /
    • 2001
  • In this work, Zn$_2$SiO$_4$:Mn phosphors were prepared by solid state reaction. The effect of sintering/reduction temperature, flow rate of H$_2$-5%/$N_2$-95% mix gas, and ball milling conditions have been investigated on the sake of PDP(Plasma Display Panel) application. The characteristics such as particle morphology and photoluminescence of prepared phosphors were compared to those of commercial Zn$_2$SiO$_4$:Mn Phosphors. It was found that the Phosphor synthesized at 130$0^{\circ}C$ with 0.08 Mn concentration had a maximum brightness, This brightness was increased more 20% by reduction treatment under 100me/min flow rate of 5%H$_2$-95%$N_2$ mixed gas. The size of particles decreased under 3$\mu\textrm{m}$ after ball milling. Especially, higher luminescence was obtained in our Zn$_2$SiO$_4$:Mn phosphors than commercial Zn$_2$SiO$_4$:Mn phosphors, so that they are able to be applied for PDP.

  • PDF

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
    • /
    • v.41 no.5
    • /
    • pp.381-387
    • /
    • 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.