• 한국진공학회지
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• 제4권3호
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• pp.253-260
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• 1995

유전장벽 방전(또는 silent방전)은 조절된 마이크로아크방전 형태로서 비교적 높은 압력(0.1~수기압)에서도 방전이 안정하므로 엑시머 생성에 의한 진공자외선 및 자외선 광원으로 적합하다. 본 연구에서는 평면형 및 원통형 유전장벽 방전장치를 제작하였고, Ar, Kr, Xe와 3% F2/He의 혼합기체를 이용하여 ArF*(193nm), KrF*(248nm), XeF*(351nm)엑시머자외선 생성실험을 수행하였다. 또한 부하전력, 기체압력, 기체조성등의 방전조건에 대한 KrF*(248nm)발광세기의 의존성을 조사하였다.

• 한국세라믹학회지
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• 제40권7호
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• pp.637-643
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• 2003

PDP(Plasma Display Panel)용 녹색 형광체의 발광특성과 결정성을 향상시키기 위해 Zn$_2$SiO$_4$:Mn에 co-dopant로 Cr과 Ti 를 각각 첨가하여 졸-겔법으로 합성하였다. 이렇게 합성된 Zn$_2$SiO$_4$:Mn, M(M=Cr, Ti) 형광체는 고상반응의 경우와 비교하여 상대적으로 낮은 온도인 110$0^{\circ}C$에서 willemite 구조의 단일상이 형성되었다. 제조된 Zn$_2$SiO$_4$:Mn, M(M=Cr, Ti) 형광체에 대하여 진공자외선(Vacuum Ultraviolet, VUV) 영역의 147 nm 여기광원을 사용하여 발광특성을 조사하였다. Co-dopant의 영향을 알아보기 위해 Mn의 농도는 2 ㏖%, $H_2O$/TEOS의 비율은 36.1로 고정하였고, 이때 Cr과 Ti 모두 0.1 ㏖%에서 가장 좋은 발광특성을 나타냈다. Cr이 co-doping된 경우는 농도가 증가할수록 잔광시간은 짧아지나 발광강도는 지속적으로 감소한 반면, Ti를 co-doping했을 때는 오히려 낮은 농도에서 발광강도의 증가를 보이며 2.0 ㏖%에서 급격히 감소하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.807-810
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• 2002

$GdPO_4$:Tb phosphor particles with spherical shape and high photoluminescence were prepared by spray pyrolysis. The brightness of prepared $GdPO_4$:Tb under the vacuum ultraviolet(VUV) illumination was comparable with that of the commercial $Zn_2SiO_4$:Mn phosphor particles. The photoluminescence spectra of $GdPO_4$:Tb phosphor particles had maximum peak at 547 nm, and the sharp peaks at 480 nm, 580 nm, and 620 nm. The spherical morphology of prepared $GdPO_4$:Tb particles was completely maintained even after the posttreatment up to 1100 $^{\circ}C$. When the posttreatment temperature was over 1100 $^{\circ}C$, the particles did not have the spherical shape anymore. The average particle size of $GdPO_4$:Tb phosphor particles prepared by using $(NH_4)_2HPO_4$ was changed from 0.5 to 1.9 ${\mu}m$ and its effect on the PL intensity was investigated. It was found that the optimized $GdPO_4$:Tb particles have a good excitation spectrum comparable to that of the commercial $Zn_2SiO_4$:Mn phosphor particles under the VUV illumination from 140 to 220 nm. We concluded that the $GdPO_4$:Tb phosphor particles with spherical shape prepared by spray pyrolysis is a promising candidate for a green-emitting PDP phosphor.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.594-597
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• 1999

The new green and red phosphors for PDP application activated by T $b^{3+}$ and E $u^{3+}$ were synthesized, and their photoluminance properties were investigated. It was found that the brightness of $Al_3$Gd $B_4$ $O_{12}$ :T $b^{3+}$ green phosphor under 147nm VUV irradiation was higher than that of commercial Z $n_2$ $SiO_4$:M $n^{2+}$ phosphor. But the emitting intensity of A1$_3$Gd $B_4$ $O^{12}$ :E $u^{3+}$ red phosphor was inferior to the commercial (Y,Gd)B $O_3$:E $u^{3+}$. $Al_3$Gd $B_4$ $O_{12}$ Phosphor had a strong excitation band at 160nm associated with the host absorption, and also the photoluminance excitation intensity of $Al_3$Gd $B_4$ $O_{12}$ :T $b^{3+}$ was higher than that of Z $n_2$ $SiO_4$:M $n^{2+}$, but the intensity of $Al_3$Gd $B_4$ $O_{12}$ :E $u^{3+}$ phosphor was smaller than (Y,Gd)B $O_3$:E $u^{3+}$ phosphor In the VUV range. C $e^{3+}$ co-doping in A1$_3$Gd $B_4$ $O^{12}$ :E $u^{3+}$ and substitution of $Al^{3+}$ by G $a^{3+}$ A1$_3$Gd $B_4$ $O^{12}$ :E $u^{3+}$ phosphor were tried, but they did not improved the optical property .d the optical property .ty .

• 한국진공학회지
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• 제12권4호
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• pp.275-280
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• 2003

Si(III) 표면위에 Gd$_2O_3:Eu^{3+}$ 결정성 형광체 박막을 이온화 집단체 증착방법으로 증착하여 이온선을 주입, 결정을 파괴한 후에 열처리를 통하여 결정구조를 변화시켰다. 초기 생장시의 결정성은 고에너지 전자회절 (RHEED)을 통해 확인하고, X선 회절과 적외선 분광법을 이용하여 시료의 결정구조의 변화를 관측하였다. Near Edge X-ray Absorption Fine Structure (NEXAFS)를 통해 전자구조의 변화를 확인하였다. 이러한 변화들이 발광 특성에 미치는 영향을 Photoluminescence (PL), Cathodoluminescence (CL), 그리고 Vacuum Ultraviolet (VUV) spectrum으로 알아보았다. 본 연구는 결정구조에 의해 변화된 전자구조가 형광체 박막의 발광특성에 미치는 영향을 보고한다.

• Current Optics and Photonics
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• 제5권1호
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• pp.1-7
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• 2021

For higher sensitivity in ultraviolet (UV) and even vacuum ultraviolet (VUV) detection of silicon-based sensors, a sandwich-structured film sensor based on Ag Localized Surface Plasmon Resonance (LSPR) was designed and fabricated. This film sensor was composed of a Ag nanoparticles (NPs) layer, SiO2 buffer and fluorescence layer by physical vapour deposition and thermal annealing. By tuning the annealing temperature and adding the SiO2 layer, the resonance absorption wavelength of Ag NPs matched with the emission wavelength of the fluorescence layer. Due to the strong plasmon resonance coupling and electromagnetic field formed on the surface of Ag NPs, the radiative recombination rate of the luminescent materials and the number of fluorescent molecules in the excited state increased. Therefore, the fluorescent emission intensity of the sandwich-structured film sensor was 1.10-1.58 times at 120-200 nm and 2.17-2.93 times at 240-360 nm that of the single-layer film sensor. A feasible method is provided for improving the detection performance of UV and VUV detectors.

• 대한화학회지
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• 제45권5호
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• pp.461-469
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• 2001

조합화학은 한번에 여러 후보 물질을 소량 합성하여 원하는 물성을 갖는 물질을 탐색하는 기술이다. 본 연구에서는 고분자 착체 조합 화학법을 이용하여, 터븀이 도핑된 $SrO-Gd_2O_3-Al_2O_3$계에 대한 형광 물질을 합성하고 특성을 검색하였다. 합성 실험은 세 성분의 조성이 약 0.05몰씩 차이를 갖게하되 모든 금속 이온 당량의 합이 1몰이 되도록 작성한 조성표에 따라 금속이온 용액, 구연산 용액 및 에틸렌 글리콜 용액을 사용하여, 고분자 착체 전구체를 형성하는 Pechini법으로 합성하였다. 합성된 전구체를 1000~1500$^{\circ}C$로 열처리한 후 제조된 분말을 UV PL(Photoluminescence)과 VUV(Vacuum-UV: 147nm) PL로 측정하여 그 특성을 검토하였다. 또한 합성된 분말의 결정성과 입자형상은 XRD와 SEM을 이용하여 확인하고 관찰하였다. UV PL 측정 결과, 240nm 여기하에서는 $Sr_{0.6}Gd_{0.12}Al_{0.17}Tb_{0.1}$$O_{\delta}$, 275 nm 여기하에서는 $Sr_{0.03}Gd_{0.89}Al_{0.03}Tb_{0.06}O_{\delta}$와 $Sr_{0.6}Gd_{0.12}Al_{0.17}Tb_{0.1}O_{\delta}$ 그리고 307nm 여기하에서는 $Sr_{0.03}Gd_{0.89}Al_{0.03}Tb_{0.06}O_{\delta}$의 조성에서 543nm의 발광 세기가 크게 나타났다. 그리고 VUV PL 측정 결과는 $Gd_{1-x-y}Al_xTb_yO_{\delta}$: 0.595 < x < 0.733, 0.016 < y < 0.017 그리고 $Sr_xAl_{1-x-y}Tb_yO_{\delta}$: 0.049 < x < 0.064, 0.02 < y < 0.039의 조성범위에서 345nm 의 발광세기가 크게 나타났다. 이 조성의 녹색 형광체는 plasma display panel에 적용 가능하다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.59-62
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• 2004

We investigated the effect of Xe content variation on the luminous efficiency of two different sub-pixel types, i.e., segmented electrode in delta color arrayed enclosed sub-pixel (SDE) and conventional stripe barrier type, in an ac plasma display panel through three-dimensional numerical simulations. The conventional cell type was found to have higher VUV generation efficiency as compared with that of SDE structure, but as the Xe content increased, the SDE type showed higher improvements in efficiency due to the lower plasma loss to the barrier walls.

• 한국염색가공학회지
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• 제19권1호
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• pp.45-52
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• 2007

Polyacrylonitrile(PAN) fiber was treated with low-temperature plasmas of argon and oxygen for surface modification, and its surface chemical structure and morphology were examined by a field emission scanning electron microscope(FESEM) and a Fourier-transform infrared microspectroscopy(IMS). The argon-plasma treatment caused the only mechanical effect by sputtering of ion bombardment, whereas the oxygen plasma brought about a chemical effect on the PAN fiber surface. The experimental evidences strongly suggested that cyclization of nitrile group and crosslinking were likely to occur in the oxygen-plasma treatment. On the other hand, with the argon-plasma treatment, numerous my pits resulted in ranging from several tens to hundreds nanometers in radius. The plasma sensitivity of functional groups such as C-H, $C{\equiv}N$, and O-C=O groups in the PAN fiber was dependent on their chemical nature of bonding in the oxygen-plasma, in which the ester group was the most sensitive to the plasma. Vacuum-ultraviolet(VUV) radiation emitted during plasma treatment played no substantial role to alter the surface morphology.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1352-1355
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• 2007

An new green phosphor, $(Y,Gd)Al_3(BO_3)_4$:Tb was synthesized by flux assisted solid reaction and its VUV excitation and emission characteristics were examined. The luminance of $(Y,Gd)Al_3(BO_3)_4$:Tb at 147 nm excitation was higher than that of $YBO_3:Tb$, while keeping the spectra and decay time of Tb ion same as those of $YBO_3:Tb$.