• Korean Chemical Engineering Research
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• v.40 no.6
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• pp.752-756
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• 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 $1,145^{\circ}C$.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07a
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• pp.210-213
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• 2002

The blue phosphor, $BaMgAl_{10}O_{17}$:$Eu^{2+}$, showing a blue emission band at about 450 nm were prepared by solid state reaction of BaC $O_3$, A $l_2$ $O_3$, MgO and E $u_2$ $O_3$ with Al $F_3$ as a flux. The thermal quenching of BaMgAl $O_{17}$:E $u^{2+}$ phosphor significantly reduces the intensity of the blue emission. It is reduced by an amount of 50% after heating at around 800$^{\circ}C$ for 1 hr. The red emission in the 580∼720 nm region of $^{5}$ $D_{0}$\longrightarro $w^{7}$ $F_1$ and $^{5}$ $D_{0}$\longrightarro $w^{7}$ $F_2$ transition of $Eu^{3+}$ is produced from the phosphor heated above 1,100$^{\circ}C$. The EPR spectrum also reveals that some part of E $u^{2+}$ ions are oxidized to trivalent ions above 1,100$^{\circ}C$ at around 90 and 140mT. This oxidation evidence is also detected from XANES absorption spectra for $L_{III}$ shell of Eu ions: an absorption peak is at 6,977eV of E $u^{2+}$ and 6,984eV of $Eu^{3+}$. The combined X-ray and neutron data suggests that the new phase of EuMgA $l_{11}$ $O_{19}$ magnetoplumbite structure may be formed by heat treatment.eat treatment.tment.eat treatment.tment.t.

• Proceedings of the KIEE Conference
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• 2005.11a
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• pp.204-206
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• 2005

Although intensive experiments have been performed to investigate the origin of boundary image sticking, one of major factors to determine display quality in AC PDP, it has not being reported clearly why it is occurred. The relationships between boundary image sticking and its possible origins such as phosphor degradation, temporal change of MgO layer, wall charge have been discussed. In this paper, we have analyzed characteristics of the boundary image sticking more clearly by the influence of local panel temperature.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.161-164
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• 2008

We proposed 2-phase regression of power function inside exponential for PDP lifetime data analysis. In introducing our method we discussed the reason why PDP degradation behavior is described by exponential function basically. By applying our method to 50HD and 50FHD PDP lifetime experiment data, we obtained more than 100,000Hr lifetime. From these results, we claim that PDP lifetime is more than 100,000Hr.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1568-1571
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• 2005

We have evaluated thermal stability of a $BaAl_2Si_2O_8:Eu^{2+}$ $(BAS:Eu^{2+})$, which have polymorph property such as hexagonal, monoclinic structure depending upon firing temperature. When both polymorph $BAS:Eu^{2+}$ were baked in air at 500 $^{\circ}C$ for 30 min, the photoluminescence (PL) intensity of $monoclinic-BAS:Eu^{2+}$ was maintained of the initial intensity. However, the PL intensity of $hexagonal-BAS:Eu^{2+}$ decreased significantly, corresponding to about 34 %. From analyses of Rietveld refinement, the difference of thermal stability of both $BAS:Eu^{2+}$ can be ascribed to both crystal structure of host materials and the average interatomic distances between $Eu^{2+}$ ion and oxygen their crystal structure which plays a key role of shield for Eu2+ ions against oxidation atmosphere.

• Korean Journal of Crystallography
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• v.13 no.2
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• pp.63-68
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• 2002

Zn/sub 2-x/Mn/sub x/SiO/sub 4/ phosphors for PDP were synthesized by solid state reaction method. The effects of firing temperature, ratio of hydrogen gas to nitrogen for heat treatment and concentration of activator and co-dopants on the luminous properties have been investigated. It was found that the phosphor fabricated at 1400℃ with x = 0.002 Mn concentration had a maximum brightness. Luminous properties of a phosphor were improved when Cr/sup 3＋/ was added as a co-dopant rather than other co-dopants.

• Journal of the Semiconductor & Display Technology
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• v.11 no.4
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• pp.43-48
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• 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.

• Journal of the Korean Ceramic Society
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• v.38 no.4
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• pp.337-342
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• 2001

PDP(Plasma Display Panel)용 녹색 형광체인 Zn$_2$SiO$_4$:Mn에 채-dopant로 Al을 첨가하여 졸-겔법으로 합성하였다. 졸-겔법으로 제조한 형광체는 기존의 고상 반응에 의해 합성된 경우보다 낮은 온도(1000-110$0^{\circ}C$)에서 Zn$_2$SiO$_4$단일상을 형성하였으며, 300-500nm의 비교적 균일한 입자를 얻을 수 있었다. 또한, co-dopant인 Al을 첨가함으로써 발광휘도를 향상시키고, 전광시간을 줄일 수 있었다. 한편, TEOS의 가수분해시 $H_2O$/TEOS 비율을 조절하여 발광의 최적 조건을 조사하였다.

• Journal of the Korean Graphic Arts Communication Society
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• v.26 no.1
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• pp.97-111
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• 2008

BLU is a important part of the most representative LCD at flat panel display. In order to supplement the optical special quality which LCD cannot light itself, BLU is an essential property to supply with same brightness on the screen. In this study we have manufactured and characterized the low temperature calcined paste that can be used as a flat light source for LCD BLU. For the phosphor paste and intermediate paste, the low temperature calcined acryl resin was used as the binder. From the result of thermal decomposition measurement, residual carbonaceous materials was found to be less than 0.2wt% at $400^{\circ}C$.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.79-82
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• 2002

In this paper, we investigate the characteristics of luminous efficacy as a function of Xe partial pressure in AC PDP. SDR structure has shown much larger increment of luminous efficacy compared with the conventional one especially below 10% Xe contents. The luminous efficacy around 4.0 lm/W is achieved with Ne-Xe10%, 400Torr in Monochrome green phosphor test panel under 10kHz continuous sustaining frequency.