WO2011027881A1 - 真空紫外発光デバイス - Google Patents
真空紫外発光デバイス Download PDFInfo
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- WO2011027881A1 WO2011027881A1 PCT/JP2010/065214 JP2010065214W WO2011027881A1 WO 2011027881 A1 WO2011027881 A1 WO 2011027881A1 JP 2010065214 W JP2010065214 W JP 2010065214W WO 2011027881 A1 WO2011027881 A1 WO 2011027881A1
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- ultraviolet light
- vacuum ultraviolet
- light emitting
- electron beam
- thin film
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7772—Halogenides
- C09K11/7773—Halogenides with alkali or alkaline earth metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J63/00—Cathode-ray or electron-stream lamps
- H01J63/06—Lamps with luminescent screen excited by the ray or stream
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
Definitions
- the present invention relates to a vacuum ultraviolet light emitting device that emits vacuum ultraviolet light using electrons emitted from an electron beam source.
- Ultraviolet light is generally referred to as ultraviolet light and is widely used for lighting, pest control, curing of resins, and the like. Recently, interest in deep ultraviolet light having a wavelength of 200 to 350 nm and vacuum ultraviolet light having a wavelength of 200 nm or less is particularly increasing. Deep ultraviolet light is expected to be used in the fields of sterilization and water purification, various medical fields, high density recording fields, high color rendering light emitting diode lighting fields, and decomposition fields of pollutants combined with photocatalysts. Vacuum ultraviolet light is expected to be applied in the field of decomposition of harmful substances due to ozone generation.
- This technology has a problem that it can not emit, for example, ultraviolet light near 260 nm or vacuum ultraviolet light useful for sterilization because the light emitting material is limited.
- the present invention solves the disadvantages of currently used UV light emitting devices, namely new UV light emission, in particular vacuum, which solves the problems of large size, high power consumption, short life and unstable intensity. It aims at providing a light emitting device of ultraviolet light.
- the present inventors use metal fluoride and thin film, so that vacuum ultraviolet light by electron irradiation is a light emitting material. It has been found that the light emitting material can be a light emitting material which is not absorbed by itself and can be easily thinned and reduced in weight of a vacuum ultraviolet light emitting device.
- a light emitting substrate comprising a transparent substrate and a metal fluoride thin film layer formed on the transparent substrate, and an electron beam source, wherein the light emitting substrate and the electron beam source are disposed in a vacuum atmosphere;
- a vacuum ultraviolet light emitting device characterized by emitting light containing a wavelength component of vacuum ultraviolet light by irradiating an electron beam to a metal fluoride thin film layer.
- the metal fluoride thin film layer is preferably a thin film layer comprising a metal fluoride containing at least one atom selected from the group consisting of Nd, Tm and Er.
- the present invention it is possible to provide a new light emitting device of vacuum ultraviolet light which does not require a small, low power consumption and complicated structure, and from the high photodegradability, it is possible to decompose harmful substances, dry and clean.
- Surface modification of molecular materials is possible, and can be suitably used in the fields of bio, medical, hygiene, environment, nanotechnology and the like.
- the thin film layer is used as the light emitting layer, the light emitting device can be designed with a large area and various shapes with a high degree of freedom as compared to a device using a conventional massive crystal, and mass production is required. It is also useful in the industrial field such as dry cleaning of semiconductor substrates because it can be incorporated into various lines.
- FIG. 1 is a schematic structural view of a vacuum ultraviolet light emitting device of the present invention.
- FIG. 6 is a schematic structural view of another example of the vacuum ultraviolet light emitting device of the present invention.
- FIG. 6 is a schematic structural view of another example of the vacuum ultraviolet light emitting device of the present invention.
- FIG. 6 is a schematic structural view of another example of the vacuum ultraviolet light emitting device of the present invention.
- 1 is a schematic view of a pulsed laser deposition apparatus.
- FIG. 2 is an emission spectrum view of the light emitting device produced in Example 1;
- FIG. 6 is an emission spectrum view of the light emitting device produced in Example 2;
- FIG. 6 is an emission spectrum view of the light emitting device produced in Example 3;
- the vacuum ultraviolet light emitting device of the present invention basically comprises a light emitting substrate comprising a transparent substrate and a metal fluoride thin film layer formed on the transparent substrate, and an electron beam source, wherein the light emitting substrate and the electron beam source have a vacuum atmosphere.
- the structure needs to be placed inside.
- FIG. 1 schematically shows the basic structure of this vacuum ultraviolet light emitting device.
- the light emitting substrate is composed of a transparent substrate 5 and a metal fluoride thin film 4 formed on the transparent substrate, and the electron beam source 1, the anode 3 described later, the metal fluoride thin film 4 and the transparent substrate 5 are arranged in this order Form a light emitting device.
- the transparent substrate 5 doubles as the window member of the vacuum vessel 6 of the vacuum ultraviolet light emitting device of the present invention, as shown in FIG.
- a light emitting substrate consisting of the metal fluoride thin film layer 4 formed on the transparent substrate 5 may be installed inside the vacuum vessel 6 of the vacuum ultraviolet light emitting device of the present invention.
- an extraction electrode 8 may be provided between the electron beam source 1 and the anode 3.
- the anode 3 functions as an acceleration electrode for further accelerating the electrons extracted and accelerated from the electron beam source 1 by the extraction electrode 8.
- the transparent substrate 5 needs to transmit vacuum ultraviolet light generated from the metal fluoride thin film layer 4 by irradiating electrons.
- the transparent substrate 5 also serves as a metal fluoride thin film forming / holding substrate.
- the structures shown in FIGS. 1 and 3 also serve as window members. Materials having such properties include lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride and the like, and magnesium fluoride is particularly preferred in view of permeability.
- the thickness of the transparent substrate 5 is not particularly limited, but is preferably in the range of 0.1 to 20 mm from the viewpoint of strength and permeability.
- the transparent substrate 5 is not particularly limited, and depends on the area required for the metal fluoride thin film layer 4 described later, and the larger the thin film layer 4 and the transparent substrate 5, the larger the light emitting device can be.
- the metal fluoride thin film layer 4 is formed on the transparent substrate 5. Electrons emitted from the electron beam source 1 are irradiated to the thin film layer 4 to emit vacuum ultraviolet light, and the vacuum ultraviolet light is then transmitted through the transparent substrate 5 (when the window member is provided, further window member is provided) And the light is emitted out of the vacuum ultraviolet light emitting device of the present invention.
- the metal fluoride which comprises the metal fluoride thin film 4 is not specifically limited, The metal fluoride which light-emits vacuum ultraviolet light by irradiation of an electron beam can be used arbitrarily. Specifically, metal fluorides such as KMgF 3 , KCaF 3 , KYF 4 , K 2 YF 5 , and KLuF 4 that emit light in a vacuum ultraviolet region of wavelength 140 to 200 nm, which is called Core-Valence (CV) light emission, It can be mentioned.
- CV Core-Valence
- NdF 3 , TmF 3 , ErF 3 , KTmF 4 , KERF 4 which emit vacuum ultraviolet light with a wavelength of 160 to 200 nm by 5d-4f transition of neodymium (Nd), thulium (Tm), erbium (Er), etc.
- LaF 3 doped with metal fluorides such as LiErF 4 , LiTmF 4 , BaTm 2 F 8 , and further Nd, Tm and Er, LaLi 3 , LuLiF 4 , LuF 3 , BaF 2 , CaF 2 , SrF 2 , LiCaAlF 6 , LiSrAlF 6 , Metal fluorides such as LiYF 4 , BaY 2 F 8 , CsY 2 F 7 , Na 0.4 Y 0.6 F 2.2 , LiKYF 5 , KYF 4 , KY 3 F 10 , K 2 YF 5 etc. are also listed.
- the crystallinity of the metal fluoride thin film layer 4 is not particularly limited, and may be any of amorphous, polycrystal and single crystal, but when Nd or the like is contained (doped), the one with higher crystallinity is doped.
- a polycrystalline or single crystal is preferable because the element easily acts as a luminescent center. Further, from the viewpoint of increasing the area of the metal fluoride thin film layer, it is preferably amorphous or polycrystalline.
- the lower limit of the film thickness of the metal fluoride thin film layer 4 is not particularly limited. However, in order to prevent the film thickness of the metal fluoride thin film layer 4 to be formed from becoming uneven and to form a portion with extremely thin film thickness, it is preferable to set the average thickness to 100 nm or more. Furthermore, in terms of luminous efficiency, the thickness is preferably 1 ⁇ m or more.
- the upper limit of the film thickness is optional, but preferably from an average of less than 10 ⁇ m from the viewpoint of maintaining the crystallinity, the reduction in size and weight, and the reabsorption of light.
- the area of the metal fluoride thin film layer 4 to be formed is not particularly limited, as long as it is too small to cause difficulty in handling and anode formation. Rather, by increasing the size, light emission of a large area can be expressed, and an element that requires a large area can be obtained.
- a metal fluoride thin film layer 4 it is possible to operate as a light emitting substrate only by forming such a metal fluoride thin film layer 4 on the transparent substrate 5 as one layer, but it is not necessary to be a single layer film, and it is also possible to form a multilayer film. For example, it is possible to improve the crystallinity of the metal fluoride thin film layer 4 by forming some kind of buffer layer which eliminates the lattice mismatch between the transparent substrate 5 and the metal fluoride thin film layer 4.
- an anti-oxidation film may be formed on the outermost surface (vacuum ultraviolet light emission surface side) of the light emitting substrate.
- the method for producing the metal fluoride thin film layer 4 is not particularly limited, and a known crystal growth method can be used. Specifically, pulse laser deposition (laser ablation), molecular beam growth in which crystals are grown from molecular materials evaporated in vacuum, or the crystal material is dissolved in a metal that has become liquid at high temperature, which becomes a species
- a method such as an LPE method or a sputtering method can be used in which crystals are grown on a substrate by inserting the substrate and cooling it.
- a thin film layer made of metal fluoride powder may be used.
- pulsed laser deposition which is a type of vapor deposition, is preferable.
- Pulsed laser deposition is a physical vapor deposition method in which a raw material is given large energy by laser pulse irradiation to be sublimated and deposited on a substrate. In contrast to chemical vapor deposition in which the optical properties of the formed thin film are likely to be nonuniform, this method can easily produce a thin film of uniform optical properties, and thus has uniform light emission performance. Are better.
- Pulsed laser deposition is one of physical vapor deposition using laser light as an energy source for raw material evaporation, and is also called laser ablation.
- High-power pulsed laser light is made incident from the laser light source 9, condensed and irradiated on the surface of the target 10, and the momentary exfoliation (ablation) of the surface layer portion occurring at that time is used to form atoms, molecules, and the like of constituent elements. It is a film forming process in which ions and clusters are deposited on the transparent substrate 5.
- the target 10 may be a single crystal, a polycrystal, a molten solidified body, a pellet or the like of the metal fluoride described above.
- the laser light source 9 the third harmonic of an Nd: YAG laser or the like can be used.
- An anode 3 is usually disposed on the metal fluoride thin film layer 4 for the purpose of extracting electrons from the electron beam source and accelerating the electrons.
- a thin metal plate, a metal film or a conductive metal oxide film can be used as the anode 3.
- the film thickness is not particularly limited, but is preferably 1 nm or more because it has minimum durability, and is preferably 1000 ⁇ m or less from the viewpoint of reduction in size and weight.
- a multilayer film may be formed using a plurality of metals or metal oxides.
- a material of the anode 3 conventionally known metals and conductive oxides can be optionally used. Specifically, it is made of at least one of aluminum, titanium, nickel, cobalt, gold, silver, copper, chromium, ITO (indium tin oxide) and the like.
- the extraction electrode 8 may be provided between the electron beam source 1 and the anode 3. In that case, electrons are extracted from the electron beam source by the extraction electrode 8 and accelerated, and the electrons are further accelerated by the anode 3.
- the extraction electrode 8 is provided on the electron beam source 1 with a spacer 2 at a gap, and is placed thereon.
- a metal thin plate can be used as the extraction electrode 8.
- the plate thickness is not particularly limited, but is preferably 10 ⁇ m or more because it has the minimum durability, and is preferably 1000 ⁇ m or less from the viewpoint of reduction in size and weight.
- a vacuum evaporation method is a method of depositing a formed material on a substrate by sublimation or evaporation of a deposition material by heating in vacuum and forming a uniform film-like sample.
- a shield called a mask it is possible to shield the portion which is not desired to be deposited, and to form the anode 3 of an arbitrary shape.
- the anode 3 can be made into a desired shape by machining a thin metal plate.
- anode and the extraction electrode there are no particular restrictions on the shape of the anode and the extraction electrode. However, since it is necessary for an electron beam to pass through the anode 3 and the extraction electrode 8 to reach the metal fluoride thin film layer 4, a mesh-shaped or slit-shaped anode is preferable. In the case of an anode having no gap and an extraction electrode, all electron beams emitted from the electron source are caught by the anode 3 and the extraction electrode 8 and do not emit light.
- the anode 3 may be formed on the surface of the transparent substrate 5 opposite to the surface on which the metal fluoride thin film layer 4 is formed, in which case the anode 3 is formed on the metal fluoride thin film layer 4. It is also necessary to apply a large voltage.
- An electron beam for emitting vacuum ultraviolet light is emitted from the electron beam source 1.
- the electron beam source 1 a thermal electron gun using an electron emitted when the metal is heated to a high temperature, using a tungsten filament or a lanthanum boride (LaB 6 ) filament, which is conventionally known, etc .; carbon nanotubes or diamond
- a field emission electron gun (field emitter) that utilizes electrons emitted by applying an electric field to a solid surface such as silicon.
- a field emitter is preferable because it can be made thin, without generating heat, having a low voltage and saving power.
- the electron beam source 1 is a field emitter, the field emitter itself is a cathode.
- the light emitting substrate and the field emitter described above need to be placed in a vacuum atmosphere. Since a low degree of vacuum tends to cause the field emitter to be sputtered and deteriorate, it is preferable to set the degree of vacuum to such an extent that sputtering does not occur. In addition, since the gas that absorbs vacuum ultraviolet light, such as oxygen, is removed by setting the vacuum atmosphere, the vacuum ultraviolet light emitted from the light emitting substrate can be efficiently irradiated to the outside of the vacuum ultraviolet light emitting device. Specifically, the light emitting substrate and the electron beam source 1 are placed in the vacuum vessel 6, and the inside of the vacuum vessel 6 is preferably evacuated to 1 Pa or less, more preferably 1 ⁇ 10 -3 Pa or less. preferable.
- a field emitter When a field emitter is used as the electron beam source 1, it varies depending on the material and shape of the field emitter, the distance from the anode, etc. For example, a voltage of 100 V to 10 kV can be applied between the field emitter and the anode 3 at an electron density of 1 to 100 mA. Just do it.
- the extraction electrode 8 is disposed between the electron beam source 1 and the anode 3, for example, between the field emitter and the extraction electrode 8 and between the extraction electrode 8 and the anode 3 with an electron density of 1 to 100 mA. It is sufficient to apply a voltage of 100 V to 10 kV.
- the vacuum ultraviolet light emitting device of the present invention emits vacuum ultraviolet light having a wavelength of 200 nm or less.
- vacuum ultraviolet light having a wavelength of 140 to 200 nm is emitted.
- Example 1 [Formation of metal fluoride thin film on transparent substrate] KMgF 3 thin films were fabricated on magnesium fluoride substrates using a pulsed laser deposition system.
- magnesium fluoride (MgF 2 ) having a diameter of 25.4 mm and a thickness of 1 mm was used.
- the inside of the chamber was evacuated to about 2.0 ⁇ 10 ⁇ 4 Pa using a rotary pump and an oil diffusion pump.
- the target is irradiated with a pulsed laser with a wavelength of 355 nm and a repetition frequency of 10 Hz to form a target surface layer to which impurities may be attached.
- the metal plate between the substrate and the target was removed, and film formation was performed.
- the distance between the target and the substrate was 4 cm, the deposition time was 240 minutes, and film deposition was performed at a substrate temperature of 400 ° C. and an energy amount of laser irradiation per unit area of 15.5 (J / cm 2 ) .
- the energy of laser irradiation per unit area of the pulse energy E of the experiment and the width D of the laser irradiation signatures of the target after laser irradiation was calculated as E / ⁇ D 2/4.
- the vacuum ultraviolet light emitting device thus produced was connected to an electrometer.
- Keithley Electrometer Model 6517 was used as an electrometer.
- a vacuum ultraviolet light emission spectrum was measured by applying 850 V to the vacuum ultraviolet light emitting device from an electrometer built-in power supply.
- the emission from the vacuum ultraviolet light emitting device was separated by an emission spectrometer (manufactured by Spectrometer, KV 201 extreme ultraviolet spectrometer).
- the wavelength of the spectrum by the emission spectrometer was swept in the range of 120 to 250 nm, and the emission intensity at each emission wavelength was recorded by the charge coupled device detector.
- the obtained emission spectrum is shown in FIG.
- a vacuum ultraviolet light emitting device was produced in the same manner as in Example 1.
- the vacuum ultraviolet light emitting device thus produced was connected to two constant voltage power supplies.
- HAR-20R15 and HARb-3R20 were used for the two constant voltage power supplies.
- a vacuum ultraviolet emission spectrum was measured by applying 650 V to the extraction electrode from the constant voltage power supply (HAR-20R15) and 3000 V to the acceleration electrode from the constant voltage power supply (HARb-3R20).
- the emission from the vacuum ultraviolet light emitting device was separated by an emission spectrometer (manufactured by Spectrometer, KV 201 extreme ultraviolet spectrometer).
- the wavelength of the spectrum by the emission spectrometer was swept in the range of 120 to 250 nm, and the emission intensity at each emission wavelength was recorded by the charge coupled device detector.
- the obtained emission spectrum is shown in FIG.
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Abstract
Description
深紫外光は、殺菌・浄水等の分野、各種医療分野、高密度記録分野、高演色発光ダイオード照明分野、光触媒と組み合わせた公害物質の分解分野での利用が期待されている。真空紫外光は、オゾン発生による有害物質の分解分野での応用が期待されている。
しかしながら、これらの紫外光の光源としては、エキシマレーザーや各種SHGレーザー(第2高調波発生レーザー)などのガスや固体を媒体とする紫外レーザー、エキシマランプや低圧水銀ランプなどのガスランプなどしか実用化されていない。これらは、大型で、寿命も短く、また高価であるため一般への応用が難しい。このため、コンパクトで安価な、そして高効率、高寿命の紫外光光源の開発が望まれていた。
更に、高純度六方晶窒化ホウ素に電子線を照射して、215nmの深紫外光を発光させる方法が知られている(特許文献1)。この技術は発光材料が限定されているために、例えば、殺菌に有用な260nm付近の紫外光や真空紫外光の発光ができないという問題がある。一方、セリウム元素を含有するフッ化リチウムカルシウムアルミニウム(Ce:LiCaAlF6)の電子線の照射による発光挙動について報告があり、290nm、310nmの深紫外光が発光することが記載されている(非特許文献1)が、真空紫外光についての記載はない。これら各文献においては、発光材料として塊状の結晶を用いているため、発光した光が発光材料自身に吸収される、薄型化や軽量化することが難しい、と言う問題があるだけでなく、大面積の、均一に発光するデバイスを作製することは容易ではなかった。
透明基板と該透明基板上に形成された金属フッ化物薄膜層とからなる発光基板と電子線源とを備え、これら発光基板と電子線源が真空雰囲気中に配置され、該電子線源から該金属フッ化物薄膜層への電子線の照射により真空紫外光の波長成分を含む光を発光させることを特徴とする真空紫外発光デバイスが提供される。
上記真空紫外発光デバイスにおいて、
金属フッ化物薄膜層が、Nd、TmおよびErからなる群より選ばれる少なくとも1種の原子を含有する金属フッ化物からなる薄膜層であること
が好適である。
また、図3、図4に示すように、電子線源1と陽極3との間に引き出し電極8を設置しても良い。このとき、陽極3は、引き出し電極8により電子線源1から引き出され加速された電子を、更に加速する加速電極として働く。
透明基板5の厚みは特に限定されないが、強度と透過性の観点から0.1~20mmの範囲であることが好ましい。特に窓部材を兼ねる場合は、強度の観点から1~20mmの範囲であることが好ましく、別途窓部材を設ける場合には強度はあまり必要ないので0.1~1mmであることが好ましい。透明基板5の面積は特に限定されず、後述する金属フッ化物薄膜層4に必要とされる面積に依存し、薄膜層4並びに透明基板5が大きいほど大面積の発光デバイスとなり得る。
[透明基板上への金属フッ化物薄膜の形成]
パルスレーザー堆積装置を用いてフッ化マグネシウム基板上にKMgF3薄膜を製造した。基板には直径25.4mm、厚さ1mmのフッ化マグネシウム(MgF2)を用いた。ターゲットにはKMgF3の溶融固化体(KF粉末とMgF3粉末の混合物(モル比=100:100)を溶融固化したもの)を用いた。先ず、ロータリーポンプと油拡散ポンプを用いてチャンバー内を約2.0×10-4Paの真空とした。次いで、成膜が行われないよう基板とターゲットを金属板で遮断した状態で、波長355nm、繰り返し周波数10Hzのパルスレーザーをターゲットに照射して、不純物が付着している可能性のあるターゲット表層の剥離・除去を10分間行った後、基板とターゲット間の金属板を外して、成膜した。ターゲットと基板間の距離は4cm、堆積時間は240分とし、成膜は基板温度を400℃、単位面積あたりのレーザー照射のエネルギー量を15.5(J/cm2)として成膜を行った。なお、単位面積あたりのレーザー照射のエネルギー量はレーザー照射後のターゲットのレーザー照射痕の幅Dと実験時のパルスエネルギーEから、E/πD2/4として算出した。パルスエネルギーEは、実験時の平均レーザーパワーPを基に、
E(J)=P(W)/10(Hz)、
の式より算出した。この成膜条件で作製した金属フッ化物薄膜の膜厚を断面SEM像の観察によって評価したところ100nmであった。
次に上から、MgF2基板、KMgF3薄膜、板厚0.05mmのスリット状銅板陽極(0.1mm幅の電極が0.1mm間隙で配列)、板厚0.1mmのテフロン製のスペーサー、カーボンナノファイバーフィールドエミッターの順に配置し、これらをテフロン板で挟みこみ固定した。これをMgF2を窓部材(厚さ3mm)とした真空容器の中に封入し、4×10-4Pa以下の真空度として、真空紫外発光デバイスを得た。
このようにして作製した真空紫外発光デバイスを、エレクトロメーターと接続した。エレクトロメーターにはKeithley Electrometer Model 6517を用いた。真空紫外発光デバイスにエレクトロメーター内蔵電源より850Vを印加し真空紫外線発光スペクトルを測定した。真空紫外発光デバイスからの発光を発光分光器(分光計器製、KV201型極紫外分光器)で分光した。発光分光器による分光の波長を120~250nmの範囲で掃引し、各発光波長における発光強度を電荷結合素子検出器で記録した。得られた発光スペクトルを図6に示した。
[透明基板上への金属フッ化物薄膜の形成]
ターゲットとしてNd:LuLiF4の溶融固化体(NdF3粉末、LuF3粉末及びLiF粉末の混合物(モル比=1:100:100)を溶融固化したもの)を用いた他は実施例1と同様にして、フッ化マグネシウム基板上にNd:LuLiF4薄膜を製造した。膜厚は300nmであった。
[デバイスの作製]
実施例1と同様にして真空紫外発光デバイスを作製した。
[デバイスの発光特性]
実施例1と同様にして、作製した真空紫外発光デバイスの発光スペクトルを測定した。得られた発光スペクトルを図7に示した。
[透明基板上への金属フッ化物薄膜の形成]
ターゲットとしてNd:LuF3の溶融固化体(NdF3粉末とLuF3粉末の混合物(モル比=10:90)を溶融固化したもの)を用い、成膜時の堆積時間を960分とした他は実施例1と同様にして、フッ化マグネシウム基板上にNd:LuF3薄膜を製造した。膜厚は200nmであった。
[デバイスの作製]
次に上から、MgF2基板、Nd:LuF3薄膜、板厚0.5mmのスリット状銅板陽極(0.1mm幅の電極が0.1mm間隙で配列)、板厚1mmのテフロン製のスペーサー、板厚0.5mmのスリット状銅板引き出し電極(0.1mm幅の電極が0.1mm間隙で配列)、板厚0.1mmのテフロン製のスペーサー、カーボンナノファイバーフィールドエミッターの順に配置し、これらをテフロン板で挟みこみ固定した。これをMgF2を窓部材(厚さ3mm)とした真空容器の中に封入し、1×10-4Pa以下の真空度として、真空紫外発光デバイスを得た。
このようにして作製した真空紫外発光デバイスを、2台の定電圧電源と接続した。2台の定電圧電源にはHAR-20R15とHARb-3R20を用いた。定電圧電源(HAR-20R15)より引き出し用電極に650Vを、定電圧電源(HARb-3R20)より加速用電極に3000Vを印加し真空紫外線発光スペクトルを測定した。真空紫外発光デバイスからの発光を発光分光器(分光計器製、KV201型極紫外分光器)で分光した。発光分光器による分光の波長を120~250nmの範囲で掃引し、各発光波長における発光強度を電荷結合素子検出器で記録した。得られた発光スペクトルを図8に示した。
2 スペーサー
3 陽極
4 金属フッ化物薄膜層
5 透明基板
6 真空容器
7 窓部材
8 引き出し電極
9 レーザー光源
10 ターゲット
Claims (3)
- 透明基板と該透明基板上に形成された金属フッ化物薄膜層とからなる発光基板と電子線源とを備え、これら発光基板と電子線源が真空雰囲気中に配置され、該電子線源から該金属フッ化物薄膜層への電子線の照射により真空紫外光の波長成分を含む光を発光させることを特徴とする真空紫外発光デバイス。
- 電子線源と陽極との間に引き出し電極が設置されていることを特徴とする請求項1に記載の真空紫外発光デバイス。
- 金属フッ化物薄膜層が、ネオジム(Nd)、ツリウム(Tm)およびエルビウム(Er)からなる群から選ばれる少なくとも1種の原子を含有する金属フッ化物からなる薄膜層であることを特徴とする請求項1に記載の真空紫外発光デバイス。
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JP2011529965A JP5468079B2 (ja) | 2009-09-07 | 2010-09-06 | 真空紫外発光デバイス |
US13/394,521 US20120161609A1 (en) | 2009-09-07 | 2010-09-06 | Vacuum ultraviolet light emitting device |
EP10813827A EP2477210A1 (en) | 2009-09-07 | 2010-09-06 | Device for emitting vacuum ultraviolet light |
CA2773264A CA2773264A1 (en) | 2009-09-07 | 2010-09-06 | Vacuum ultraviolet light emitting device |
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EP (1) | EP2477210A1 (ja) |
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Cited By (4)
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JP2011055898A (ja) * | 2009-09-07 | 2011-03-24 | Nagoya Institute Of Technology | 殺菌用光源 |
JP2013043823A (ja) * | 2011-08-26 | 2013-03-04 | Tokuyama Corp | 真空紫外発光素子及び中性子検出用シンチレーター |
US20130313964A1 (en) * | 2012-05-25 | 2013-11-28 | Futaba Corporation | Ultraviolet Light-Emitting Material And Ultraviolet Light Source |
JP2015103340A (ja) * | 2013-11-22 | 2015-06-04 | 学校法人立命館 | 深紫外発光素子 |
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US9184559B2 (en) * | 2010-11-10 | 2015-11-10 | Ushio Denki Kabushiki Kaisha | Electron-beam-pumped light source |
CN103426718B (zh) * | 2013-03-25 | 2016-08-10 | 上海显恒光电科技股份有限公司 | 平板紫外辐射光源3d打印系统及其光源 |
US9711255B2 (en) | 2015-01-16 | 2017-07-18 | Stanley Electric Co., Ltd | Ultraviolet-emitting material and ultraviolet light source |
US11964062B2 (en) * | 2019-09-03 | 2024-04-23 | Luxhygenix Inc. | Antimicrobial device using ultraviolet light |
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- 2010-09-06 US US13/394,521 patent/US20120161609A1/en not_active Abandoned
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Cited By (5)
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JP2011055898A (ja) * | 2009-09-07 | 2011-03-24 | Nagoya Institute Of Technology | 殺菌用光源 |
JP2013043823A (ja) * | 2011-08-26 | 2013-03-04 | Tokuyama Corp | 真空紫外発光素子及び中性子検出用シンチレーター |
US20130313964A1 (en) * | 2012-05-25 | 2013-11-28 | Futaba Corporation | Ultraviolet Light-Emitting Material And Ultraviolet Light Source |
US8901808B2 (en) * | 2012-05-25 | 2014-12-02 | Futaba Corporation | Ultraviolet light-emitting material and ultraviolet light source |
JP2015103340A (ja) * | 2013-11-22 | 2015-06-04 | 学校法人立命館 | 深紫外発光素子 |
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JP5468079B2 (ja) | 2014-04-09 |
CA2773264A1 (en) | 2011-03-10 |
US20120161609A1 (en) | 2012-06-28 |
JPWO2011027881A1 (ja) | 2013-02-04 |
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