KR100800567B1 - Field Emission Type Light System using Carbon Nanotubes - Google Patents
Field Emission Type Light System using Carbon Nanotubes Download PDFInfo
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- KR100800567B1 KR100800567B1 KR1020020020472A KR20020020472A KR100800567B1 KR 100800567 B1 KR100800567 B1 KR 100800567B1 KR 1020020020472 A KR1020020020472 A KR 1020020020472A KR 20020020472 A KR20020020472 A KR 20020020472A KR 100800567 B1 KR100800567 B1 KR 100800567B1
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- carbon nanotubes
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- nanotubes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/30—Cold cathodes, e.g. field-emissive cathode
- H01J1/304—Field-emissive cathodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes
Abstract
본 발명은 열적, 화학적으로 극히 안정되어 있고 나노미터 두께의 지름을 갖은 극히 뾰족한 모양의 탄소나노튜브를 이용한 새로운 개념의 전계방출소자의 제조 방법에 관한 것으로 탄소나노튜브를 전기영동법으로 금속선에 배열시켰으며, 금속 도금으로 탄소나노튜브와 금속선간의 접착력을 증대시켜 나노튜브의 물리적,화학적 안정성이 높고 전자전달이 용이하여 금속선과의 접촉저항을 감소시켜 조명장치용 전자에미터 소자로 이용할 수 있다.
카본나노튜브,전계방출,전자에미터, 조명장치
The present invention relates to a method of manufacturing a new concept field emission device using an extremely sharp carbon nanotube having a thermally and chemically stable and nanometer-thick diameter. The carbon nanotubes are arranged on a metal wire by electrophoresis. In addition, by increasing the adhesion between the carbon nanotubes and the metal wire by metal plating, the physical and chemical stability of the nanotubes are high, and the electron transfer is easy.
Carbon nanotubes, field emission, electron emitters, lighting devices
Description
제 1도는 본 발명의 제조공정를 도시한 단면도이다. 1 is a cross-sectional view showing the manufacturing process of the present invention.
** 도면의 주요 부분에 대한 부호의 설명 ** ** Description of symbols for the main parts of the drawing **
1 : 금속선(wire) 2 : 미세금속입자 1: metal wire 2: fine metal particles
3 : 탄소나노튜브 4 : 원통형 기판
3: carbon nanotube 4: cylindrical substrate
본 발명은 가정용 및 광고용에 적합한 조명장치 및 그 제조방법에 관한 것으로 발광효율을 극대화하여 전기에너지를 절약할수 있는 조명장치를 제조하고자 한다. The present invention relates to a lighting device suitable for home and commercial use and a method of manufacturing the same to maximize the luminous efficiency to manufacture a lighting device that can save electrical energy.
종래의 형광등과 같은 조명장치는 수은 및 불활성기체를 내포하는 형광체가 코팅된 유리관내에서 수은아크방전을 일으켜 자외선을 가시광선으로 변환되어 빛을 발생한다. 이와 같이 형광등과 같은 조명장치는 일반적으로 긴 유리관 모양을 하고 있기 때문에 직선형, 원모양 등과 같이 한정된 형태를 갖을수 밖에 없다. 그리고 에너지 효율 측면에서 30-40% 수준으로 백열전등에 비해서는 다소 높은 수준이나 개선의 여지가 많다. 뿐만아니라 내구성 측면에서 2000 내지 3000시간 정도의 낮은 수준이다. A conventional lighting device such as a fluorescent lamp generates a mercury arc discharge in a glass tube coated with a phosphor containing mercury and an inert gas, and converts ultraviolet rays into visible light to generate light. As such, lighting apparatuses such as fluorescent lamps generally have a long glass tube shape, and therefore have a limited form such as a straight line and a circular shape. In terms of energy efficiency, it is 30-40% higher than incandescent lamps, but there is much room for improvement. In addition, it is a low level of 2000 to 3000 hours in terms of durability.
한편 최근에는 유기 발광소자(EL)를 이용하여 에너지효율이 높고, 두께가 수mm인 평면 조명장치를 개발하고 있으나, 이는 유기물을 사용하기 때문에 내구성이 떨어지고, 조명으로써 충분한 조도를 발휘할수 없다. On the other hand, recently, a flat lighting device having a high energy efficiency and a thickness of several mm has been developed by using an organic light emitting device EL. However, since the organic material is used, durability is low, and illumination cannot be achieved with sufficient illumination.
본 발명에서는 기존 조명장치보다 우수한 조도를 발휘하면서 에너지효율이 높고, 내구성을 보유한 조명장치를 제공하고자 한다.
The present invention is to provide an illumination device having high energy efficiency and durability while exhibiting better illuminance than existing lighting devices.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위한 것으로써, 양극으로 사용되는 원통형 기판(4) 내부에 ITO(Indium tin oxide)층이 도포되어 있고, ITO층 위에 형광체층이 도포되어 있으며, 음극으로 사용되는 금속선(Wire)(1)에는 전기영동을 이용하여 탄소나노튜브를 수직에 가깝도록 배열시키며, 유기물의 사용을 배제하여 아웃개싱의 위험성을 제거하며, 탄소나노튜브와 금속선 사이를 금속도금을 이용하여 미세금속입자(2)로 강하게 결합시켜서 접촉저항을 최소화시킨후, 원통형 기판(4)과 금속선(1) 사이를 진공으로 하여 전계방출형 조명장치를 완성할 수 있었다. The present invention is to solve the problems of the prior art as described above, an indium tin oxide (ITO) layer is applied to the inside of the cylindrical substrate 4 used as an anode, a phosphor layer is coated on the ITO layer, The metal wire (1) used as the cathode arranges the carbon nanotubes close to the vertical by using electrophoresis, eliminates the risk of outgassing by eliminating the use of organic substances, and removes the metal between the carbon nanotubes and the metal wires. After the strong contact with the fine metal particles (2) by using plating to minimize the contact resistance, the field emission-type lighting device was completed by the vacuum between the cylindrical substrate 4 and the metal wire (1).
상기 목적을 달성하기 위하여 본 발명의 전계방출소자는 탄소나노튜브를 전기영 동법으로 금속선(1)에 배열시킨후 금속도금으로 탄소나노튜브와 금속선 사이의 결합력을 증대시켰다. 사용된 탄소나노튜브는 산화 절단하여 사용하였다. 이하, 본 발명에 관하여 첨부된 도면을 참조하면서 상세히 설명하도록 한다. In order to achieve the above object, the field emission device of the present invention arranges the carbon nanotubes on the metal wire 1 by electrophoresis and then increases the bonding force between the carbon nanotubes and the metal wires by metal plating. The carbon nanotubes used were oxidatively cut. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
금속선(1)은 Cu, Al, Pt, Ag, Cr, Au와 같은 전기전도성이 우수한 금속중에서 선택된 1종으로, 금속선 위에는 실질적으로 전자방출원으로 사용되는 탄소나노튜브(3)가 설치되어 있으며, 탄소나노튜브는 아크방전을 이용하여 제조되고, 질산과 황산이 혼합된 산화제에서 8시간이상 산화시켜 직경(d)이 1 ~ 100㎚이고, 길이(L)가 0.01 ~ 20 ㎛이고, 길이(L)와 직경(d)의 비인 L/d가 5 ~ 20000이 되게한 후, 일반적인 대전제로 처리하여 전기영동법으로 층두께가 0.01 ~ 10㎛가 되게 탄소나노튜브층(3)을 형성시켰다. 좀 더 바람직하게는 탄소나노튜브의 직경(d)이 10 ~ 50㎚이고, 길이(L)가 0.1 ~ 5㎛이고, 길이(L)와 직경(d)의 비인 L/d가 2 ~ 500일때 더욱 더 전자방출 능력이 우수하였다.The metal wire 1 is one selected from metals having excellent electrical conductivity such as Cu, Al, Pt, Ag, Cr, Au, and is provided with
탄소나노튜브층(3)위에 전극기판과 탄소나노튜브와의 접착성을 향상시키기 위해 Ag, Cu, Ni, Zn, Au, Co, Al로부터 선택된 1종의 금속을 이용하여 전기도금법으로 2 ~ 8볼트에서 1 ~ 60 초간 도금을 한후 추가로 0.5 ~ 3볼트로 1 ~ 5분간 전기도금을 하여 입자크기가 0.001 ~ 0.5㎛의 미세금속입자(2)로 탄소나노튜브 사이사이의 빈공간이 채워져 있게 하였다. 금속선과 탄소나노튜브와의 접착성이 불량할 경우 전자방출시 과부하에 의해 전자방출원으로써 충분한 수명을 발휘할수 없다. In order to improve the adhesion between the electrode substrate and the carbon nanotubes on the carbon nanotube layer (3) by using a metal selected from Ag, Cu, Ni, Zn, Au, Co, Al by 2 ~ 8 After plating for 1 to 60 seconds in the bolt, electroplating for 1 to 5 minutes with additional 0.5 to 3 volts to fill the empty space between the carbon nanotubes with fine metal particles (2) having a particle size of 0.001 to 0.5㎛. It was. If the adhesion between the metal wire and the carbon nanotubes is poor, it may not be able to exert a sufficient lifetime as an electron emission source due to overload during electron emission.
금속선(1) 위에 설치된 전자방출에 유효한 나노튜브의 밀도는 103 내지 1010 개/㎟일 경우 충분한 발광효과를 발휘할 수 있었으며, 좋게는 103 내지 107 개/㎟일때 더욱 양호한 발광특성을 나타내었다. 나노튜브의 밀도는 103 개/㎟ 미만일 경우는 충분한 발광을 나타내지 못해 조명으로써 사용할수 없었으며, 1010 개/㎟를 초과해서는 실질적으로 제조할수 없었다.The density of the nanotubes effective for electron emission provided on the metal wire 1 was sufficient to exhibit sufficient luminescent effect at 10 3 to 10 10 / mm2, and more preferably at 10 3 to 10 7 / mm2. It was. When the density of the nanotube was less than 10 3 / mm 2, it could not be used as illumination because it did not show sufficient light emission, and it could not be practically produced when the density of the nanotube was more than 10 10 / m 2.
본 발명은 열적, 화학적으로 극히 안정되고, 기존의 탄소나노튜브를 이용한 전계방출장치에서 나타나는 문제점인 탄소나노튜브와 금속선과의 접착력 불량에 의한 접촉저항 증가, 유기바인더에 의한 아웃개싱 등을 해결할 수 있는 전자방출원을 제작할 수 있었으며, 특히 탄소나노튜브가 배열되어 있는 금속선을 조명장치용 전자에미터 소자로 이용할 경우 고휘도화, 저소비전력화, 장수명화가 가능하다. The present invention is extremely stable thermally and chemically, and can solve the problem of the field emission device using the conventional carbon nanotubes, the contact resistance increase due to poor adhesion between the carbon nanotubes and the metal wire, the outgassing by the organic binder, etc. The electron emission source can be fabricated, and in particular, when the metal line in which carbon nanotubes are arranged is used as an electron emitter device for a lighting device, high brightness, low power consumption, and long life can be achieved.
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KR20070005147A (en) * | 2005-07-05 | 2007-01-10 | 삼성에스디아이 주식회사 | Electron emission source comprising carbon-based material and metal nanorod, electron emission device comprising the same, an composition for preparing the electron emission source |
KR100773152B1 (en) * | 2006-04-05 | 2007-11-02 | 금호전기주식회사 | Field-emission lamp using CN-based material |
KR101038670B1 (en) * | 2009-02-26 | 2011-06-02 | 한양대학교 산학협력단 | Carbon Nano-tube-based Cathode Fabrication Method for Growing Carbon Nano tubes on a Metal Tip without any Buffer Layer |
KR101231598B1 (en) * | 2011-02-10 | 2013-02-08 | 고려대학교 산학협력단 | Cnt field electron emitter and manufacturing method thereof |
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JPH11329217A (en) * | 1998-05-15 | 1999-11-30 | Sony Corp | Manufacture of field emission type cathode |
JP2000348600A (en) * | 1999-06-02 | 2000-12-15 | Sharp Corp | Cold cathode using cylindrical electron source and manufacture thereof |
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JPH11329217A (en) * | 1998-05-15 | 1999-11-30 | Sony Corp | Manufacture of field emission type cathode |
JP2000348600A (en) * | 1999-06-02 | 2000-12-15 | Sharp Corp | Cold cathode using cylindrical electron source and manufacture thereof |
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