• 제목/요약/키워드: Field Emission

검색결과 2,718건 처리시간 0.034초

A flat thin display with RF electron generation

  • Dijk, R. Van;Vissenberg, M.C.J.M.;Zwart, S.T. De
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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    • pp.927-930
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    • 2004
  • We report on a new type of a flat and thin display with a secondary emission electron source. In this display device electrons are multiplied between two secondary emission plates under a high frequency electric field. This principle has a few important advantages over a field emission display: the emission comes from flat plates, which reduces the life-time problems of ion bombardment of field emitter tips. Furthermore, the electron emission is space charge limited which gives a uniform electron distribution. The electrons are extracted from the source and accelerated to a phosphor screen to generate light. Gray levels are made by pulse width modulation.

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Selective Growth of Multi-walled Carbon Nanotubes by Thermal Chemical Vapor Deposition and Their Field Emission Characteristics

  • Jeong, Se-Jeong;Lee, Seung-Hwan;Lee, Nae-Sung;Han, In-Taek;Kim, Ha-Jin;Kim, Jong-Min
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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    • pp.1096-1099
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    • 2005
  • Multi-walled carbon nanotubes (CNTs) grown on catalyst dots by thermal chemical vapor deposition were vertically aligned with a high population density. Such densely populated CNTs showed poor field emission characteristics due to the electrical screening effect. We reduced the number density of CNTs using an adhesive tape treatment. For dotpatterned CNTs, the tape treatment decreased the CNT density by three orders of magnitude, drastically improved the turn-on electric field from 4.8 to $1.8V/{\mu}m$, and changed the emission image from spotty to uniform luminescence. We also report long-term emission stability of dot-patterned CNTs by measuring the emission currents with time at different duty ratios.

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Effects of additives and post-treatments on emission characteristics of carbon nanotubes field emitters by screen printing method

  • Lee, Duck-Jin;Kim, Sam-Soo;Lee, Yang-Kyu;Chun, Hyun-Tae;Lee, Dong-Gu
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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    • pp.1447-1450
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    • 2005
  • Carbon nanotube field emission display devices were fabricated using screen printing techniques. The CNT pastes are composed of organic binder, CNT, and additive materials such as glass frit, silver or ITO powders. The change in mixing ratio of various organic binders in CNT paste varied the electron emission characteristics. With increasing the contents of additive materials in CNT paste, turn-on field were increased, leading to decrease in electron emission current. The post-treatment process in this study induced the vertical alignment of carbon nanotubes on glass, resulting in the improvement of electron emission uniformity.

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모형 가스터빈 연소기에서 2차공기 주입이 연소장에 미치는 영향 (Effects of Secondary Air Injection in Combustion Field of Model Gas Turbine Combustor)

  • 김규성;임경달;이동형
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2000년도 춘계학술대회 논문집
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    • pp.171-176
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    • 2000
  • This purpose of this study is to investigate the combustion emission characteristics on the effect of secondary air injection in combustion field of model gas turbine combustor changing excess air ratio. For this purpose, meantemperature, CO, CO2, O2 and HC concentration were measured by changing excess air ratio and secondary air injection. As a result of this study, meantemperature, CO2 emission was decreased and CO emission increased by increasing the excess air ratio of secondary air. therefore, This paper showed the effect of Secondary air injection on flame structure, combustion emission characteristics.

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In-situ TEM of Carbon Nanotube Field Emitters and Improvement of Electron Emission from Nanotube Films by Laser Treatment

  • Saito, Yahachi;Seko, Kazuyuki;Kinoshita, Jun-ichi;Ishida, Toshiyuki;Yotani, Junko;Kurachi, Hiroyuki;Uemura, Sashiro
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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    • pp.1081-1086
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    • 2005
  • Dynamic behavior of carbon nanotubes (CNTs) in an electric field is directly observed by in-situ transmission electron microscopy (TEM). The CNT field emitters examined by in-situ TEM are multiwalled, double-walled and single walled CNTs. Threshold fields for electron emission and sustainable emission currents depending on the structure of CNTs are presented, and degradation mechanism of the CNT field emitters is discussed. In addition to the microscopy studies on individual CNTs, our recent development in surface treatment of CNT layers grown by chemical vapor deposition, which brings about high density of emission current and high uniformity, is also presented.

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유도결합형 플라즈마 화학기상증착법에서 탄소나노튜브의 수직성장과 전계방출 특성 향상 연구 (Improvement Study on Vertical Growth of Carbon Nanotubes and their Field Emission Properties at ICPCVD)

  • 김광식;류호진;장건익
    • 한국전기전자재료학회논문지
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    • 제15권8호
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    • pp.713-719
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    • 2002
  • In this study, the vertically well-aligned CNTs were synthesized by DC bias-assisted inductively coupled plasma hot-filament chemical vapor deposition (ICPHFCVD) using radio-frequence plasma of high density and that CNTs were vertically grown on Ni(300 )/Cr(200 )-deposited glass substrates at 58$0^{\circ}C$. This system(ICPHFCVD) added to tungsten filament in order to get thermal decompound and DC bias in order to vertically grow to general Inductively Coupled Plasma CVD. The grown CNTs by ICPHFCVD were developed to higher graphitization and fewer field emission properties than those by general ICPCVD. In this system, DC bias was effect of vortical alignment to growing CNTs. The measured turn-on fields of field emission property by general ICPCVD and DC bias-assisted ICPHFCVD were 5 V/${\mu}{\textrm}{m}$ and 3 V/${\mu}{\textrm}{m}$, respectively.

Uniform Field Emission from Carbon Nanotubes Fabricated by CO Disproportionation

  • Lee, Jin-Seung;Suh, Jung-Sang
    • Bulletin of the Korean Chemical Society
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    • 제24권12호
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    • pp.1827-1831
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    • 2003
  • Field emission of carbon nanotubes (CNTs) fabricated by disproportionation of CO has been studied. CNTs fabricated on well-ordered Co nanowire arrays formed on the porous anodic aluminum oxide templates were well graphitized, uniform in diameter and aligned vertically with respect to the plane of the template, and showed a good field emission property. Very uniform emissions were observed from the CNTs fabricated at relatively low temperature, $500-600^{\circ}C$. Low fabrication temperature such as $500^{\circ}C$ could make it possible to fabricate CNTs on soda lime glass, a low-cost substrate, for display panel.

Field Emission Characteristics of Dot-patterned Photosensitive CNT paste

  • Kim, Jin-Hee;Lee, Han-Sung;Jeon, Ji-Hyeon;Goak, Jeung-Choon;Lee, Nae-Sung
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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    • pp.786-789
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    • 2007
  • Fabrication of dot-patterned carbon nanotube (CNT) emitters with excellent field emission properties using photo-sensitive CNT paste is described. The photosensitive CNT paste showed good photopatternability, which led us to easily form $10-{\mu}m-diameter$ dot arrays. We presented a parametric study on formulating the photo-sensitive paste and their resultant field emission characteristics.

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Luminescence Enhancement by Ba in SrTiO3:Pr, Al Red Phosphor for Field Emission Displays

  • Won, Chang-Whan;Lee, Jong-Eun;Won, Hyung-Il;Kim, Kwang-Bok;Song, Yoon-Ho;Kang, Seung-Youl;Koo, Kyoung-Wan
    • 한국세라믹학회지
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    • 제43권11호
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    • pp.743-745
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    • 2006
  • The luminescence properties of $Sr_{1-x}Ba_xTiO_3:Pr$, Al red phosphor for Field Emission Displays (FEDs) have been investigated in powders prepared though solid-state reactions. $Sr_{1-x}Ba_xTiO_3:Pr$, Al red phosphors indicate a higher luminescent intensity, and have been found to have potential for field emission displays. The addition of Ba increased the luminescence intensity at 617 nm by up to 30%. Ba ions are effective in producing the energy transfers from host-to-activator in 4f-5d transitions.

Dot 패턴 된 감광성 CNT 페이스트의 전계방출 특성 향상 (Improvement of Field Emission Characteristics of Dot-patterned Photo Sensitive CNT Paste)

  • 김진희;이한성;전지현;곽정춘;이내성
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.155-156
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    • 2007
  • Fabrication of dot-patterned carbon nanotube (CNT) emitters with excellent field emission properties using photo-sensitive CNT paste is described. The photosensitive CNT paste showed good photo-patternability, which led us to easily form $10-{\mu}m$-diameter dot arrays. We presented a parametric study on formulating the photo-sensitive paste and their resultant field emission characteristics.

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