• 전기학회논문지
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• 제56권9호
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• pp.1619-1625
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• 2007

The gas mixture ratio of PDP discharges plays a very important role in the discharge characteristics of a plasma display panel. The increase of Xe contents results in the increases of luminance and luminous efficiency while it also results in the increase of the breakdown voltage. The addition of He gas increases the brightness and the luminous efficiency. Especially, the luminance and the luminous efficiency have a maximum value when the partial pressure of He is about 10% of the total pressure for a standard plasma display panel with Xe fraction of $10\sim30%$.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1221-1224
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• 2005

The improvement of luminance and luminous efficiency is the one of the most important parts in AC-PDPs. To achieve high luminance and luminous efficiency, high VUV emission efficiency is needed. We measured the emission spectra of the vacuum ultraviolet(VUV) rays in surface discharge AC-PDP with ternary gas mixture of He-Ne-Xe. The influence of He-Ne-Xe gas-mixture ratio on excited $Xe^{\ast}$ resonant atoms and $Xe_2\;^{\ast}$ dimers has been investigated. It is found that luminous efficiency of ternary gas mixture, He-Ne-Xe, is shown to be much higher than that of binary gas mixture of Ne-Xe. For improving discharge luminous efficiency, we have studied VUV emission characteristics of ternary gas mixture, He(50%)-Ne-Xe and He(70%)-Ne-Xe with Xe concentration and filling gas pressure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.919-921
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• 1998

In Color AC Plasma Display Panel(PDP). Low luminous efficiency is a major problem. We measured luminous efficiency of PDP as a function of the Ar mixing ratio. Our results show that efficiency has improved by $5{\sim}10%$ at the condition of 0.5% Ar mixing ratio, compared with Ne-Xe(4%) or He-Ne-Xe(4%) (He:Ne = 7:3) gas.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권10호
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• pp.704-709
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• 1999

The optical properties such as luminance and color coordinates for phosphor layer were studied with applied voltage and gas pressure, Xe mixing ratio, frequency using He and Xe mixing gas in chamber like AC PDP. The luminance of red phosphor layer at constant pressure(300Toor) is increased with increasing voltage, but color purity is not varied. The luminance of red phosphor layer at constant voltage(280V)is decreased with increasing pressure, but the color purity is not varied. But the luminance is increased with increasing Xe mixing ratio at constant pressure(200Toor). And also the color purity is improved by this process. The luminance is increased up to 40kHz, but the color purity with frequency is not varied.

• Nuclear Engineering and Technology
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• 제56권2호
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• pp.601-610
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• 2024

This paper gives an extensive analysis on the characterization of xenon isotopic ratios for various nuclear reactors and nuclear explosions through neutronic depletion codes. The results of the characterization can be used for discriminating the sources of the xenon isotopes' release among the nuclear explosions and nuclear reactors. The considered sources of the xenon radionuclides do not only include PWR, CANDU, and nuclear explosions using uranium and plutonium bombs, but also IRT-200 and 5MWe Yongbyon (MAGNOX reactor) research reactors operated in North Korea. A new data base (DB) on xenon isotopic activity ratios was produced using the results of the characterization, which can be used in discrimination of the sources of xenon isotopes. The results of the study show that 5MWe Yongbyon reactor has quite different characteristics in ¹³⁵Xe/¹³³Xe ratio from the PWRs and the nuclear reactors have different characteristics in ¹³⁵Xe/¹³³Xe ratios from the nuclear explosions.

• 한국진공학회:학술대회논문집
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• 한국진공학회 1999년도 제17회 학술발표회 논문개요집
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• pp.230-230
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• 1999

PDP 미세면방전에서 방전의 전기, 광학적 특성을 이해하기 위해서는 근본적으로 면방전에 대한 기초적인 이해와 연구가 뒤따라야 한다. 따라서 본 연구에서는 일차적으로 방전 전극구조에서 방전 전압변화에 가장 중요한 변수인 방전 유지 전극 간격에 대해서 구동 진동수, 유전체 두께, 전극폭, MgO 보호막 두께 등과 같은 다른 변수들은 고정시켜 놓고 방전기체종류(Ne,Xe, He)와 Xe 기체혼합 비율 (1%, 4%, 7%등)에 따라서 방전유지 전극간격(50, 100, 150, 200$mu extrm{m}$)을 변화시켜가며 실험을 수행했다. 방전 유지 전극의 간격(d)이 좁을수록 방전개시(Vf), 유지 전압(Vs)은 낮아지고 전극간격을 점차로 넓게 하면 방전개시, 유진 전압이 높아지게 되는 즉 전극 간격에 따라서 가스 압력(P)에 따른 파센 최저방전 개시전압과 최저방전 유지전압 특성곡선이 존재함을 알 수 있었다. 또한 단일종의 기체를 사용했을 때 보다는 혼합기체를 사용했을 때 Penning effect에 의해서 방전 전압이 상대적으로 낮아지는 경향을 관측 할 수 있었으며, Xe 기체 혼합 비율에 따른 방전전압 특성 또한 관측하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1568-1569
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• 2007

TFT-LCD used in display area is not a light-emissive device itself but TFT-LCD can overcome through the employ of the backlight unit (BLU). BLU is very important device in TFT-LCD system. However, the old-fashion BLU of CCFL type is crucible to the health due to the contained material, mercury (Hg). Moreover, strong temperature dependency of lamp employed with Hg becomes the other disadvantage in practical usage. To solve these problems, Hg-Free lamp with strong thermal resistance property is required to displace the Hg lamp. We studied optical and electrical properties of Xe-Ne-He mixed gas that is dependent on change of mixed ratio and pressure. In our results, the designed lamp without the phosphorescent material has the lowest firing voltage at xe 50%(Ne:He=9:1).

• 한국광학회지
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• 제5권3호
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• pp.386-393
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• 1994

XeCl 엑시머 레이저를 횡방향의 전자빔으로 여기하여 이의 출력특성을 조사하였다. 전자빔의 출력은 880kV, 21kA(70ns, FWHM)이며 전자빔의 전류밀도는 다이오드(A-K) 간격과 공진기 외부에 설치한 펄스자계코일(4.7kG)로 제어하였다. 레이저 매질에 주입되는 전자빔의 축적에너지는 35J(4기압)이다. 축적에너지는 Radcolor film의 감광면적과 압력상승법에 의해 측정한 가스매질의 상승압력으로부터 환산된 수치이며, 이 때의 여기체적은 $320cm^{3}$이었다. 레이저 가스의 혼합비율은 HCl/Xe/Ar=0.2/6.3/93.5%이고 총압력이 3기압일 때, 최대효율 1.7%를 얻었다. 이 때의 출력에너지, 특성에너지는 각각 0.52J, 1.7J/l이었다. 실험결과의 분석을 위해 컴퓨터 시뮬레이션코드를 완성하였다. 시뮬레이션 결과는 실험결과와 잘 부합하고 있음을 확인하였고 그 결과를 이용하여 XeCl의 형성채널, 완화채널, 308nm의 흡수채널을 이론적으로 설명하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.743-747
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• 2003

The improvement of luminance and luminous efficiency is the one of the most important part in AC-PDPs. To achieve high luminance and luminous efficiency, high VUV emission efficiency is needed. We measured the emission spectra of vacuum ultraviolet(VUV) and infrared(IR) rays in surface discharge AC-PDP with Ne-Xe mixture gas. The influence of Ne-Xe gas-mixture ratio on resonance state $Xe^{\ast}(3P_{1})$ and exited state $Xe^{\ast}(3P_{2})$ has been investigated. It is found that the intensity of VUV 147nm emission is proportional to that of the IR 828 nm emission, and the VUV 173nm emission is roughly proportional to that of the IR 823nm emission. The electron temperature and plasma density have been experimentally measured from the center of sustaining electrode gap by a micro Langmuir probe in AC-PDPs. The plasma density from the center of sustaining electrode gap are shown to be maximum value of $9{\times}10^{11}cm^{-3}$, where the electron temperature is about 1.6 eV in this experiment

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.220-220
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• 2011

The Ne-Xe plasmas in dense plasma-focus device with coaxial electrodes were generated for extreme ultraviolet (EUV) lithography. The influence of gas mixture ratio, Ne-Xe (1, 10, 15, 20, 25, 30, 50%) mixture gas, on EUV emission measurement, EUV intensity and electron temperature in the coaxially focused plasma were investigated. An input voltage of 4.5 kV was applied to the capacitor bank of 1.53mF and the diode chamber was filled with Ne-Xe mixture gas at a prescribed pressure. The inner surface of the cylindrical cathode was lined by an acetal insulator. The anode was made of tin metal. The EUV emission signal of the wavelength in the range of 6~16 nm has been detected by a photo-detector (AXUV-100 Zr/C, IRD). The visible emission line was also detected by the composite-grating spectrometer of the working wavelength range of 200~1100 nm (HR 4000CG). The electron temperature is obtained by the optical emission spectroscopy (OES) and measured by the Boltzmann plot with the assumption of local thermodynamic equilibrium (LTE).