WO2005048294A1

WO2005048294A1 - Field emission ultraviolet lamp

Info

Publication number: WO2005048294A1
Application number: PCT/JP2003/014471
Authority: WO
Inventors: Kouichi Takase; Shinichi Hirabayashi
Original assignee: Nihon University; Japan Communication Inc.
Priority date: 2003-11-13
Filing date: 2003-11-13
Publication date: 2005-05-26
Also published as: AU2003280778A8; JPWO2005048294A1; AU2003280778A1

Abstract

In order to realize a long-lifetime, surface emission type field emission ultraviolet lamp for activating a photocatalyst, a plurality of linear cathode conductors (3) are arranged in parallel on a planar cathode-side glass substrate (1). A graphite carbon film (8) is formed on the anode-side surface of the cathode conductors (3) by CVD. An anode-side glass substrate (2) is arranged oppositely to the cathode-side glass substrate (1), a groove (7) and an anode conductor (5) are provided in association with each cathode conductor (3), and the anode conductor (5) is coated with phosphor (5) generating UV-rays. The cathode side glass substrate (1) and the anode side glass substrate (2) are stored in a vacuum container. Since the plurality of linear cathode conductors (3) formed with the carbon film (8) are arranged in parallel, the emission surfacecan be made planar while prolonging the lifetime of the lamp and a field emission ultraviolet lamp optimal for activating a photocatalyst can be realized.

Description

Description Field emission UV lamp Technical field

The present invention relates to a field emission ultraviolet lamp, and more particularly to a flat emission type field emission ultraviolet lamp used for activating a photocatalyst. Background art

Conventionally, a mercury lamp or the like has been used as a light source for activating a photocatalyst. When the ultraviolet light emitted from the mercury lamp is irradiated on the photocatalyst layer, the photocatalyst layer is activated. Mercury-free UV lamps are also used because mercury lamps can harm the environment if not properly treated after use. Some fluorescent lamps emit near-ultraviolet light in the wavelength range of 300 to 400 nm when excited by the vacuum ultraviolet light emitted by a rare gas such as xenon. A phosphor that generates ultraviolet _{rays, YP0 4: Ce, Ce (} Mg, Ba) AluO ^ LaP0 4: Ce, BaSi 2 Os: Pb, SrB 4 〇 _{^{7: E +, (Ba,}} Sr, Mg) 3S12O7: _{^{_{Pb 2 +, BaSkOs: Pb 2}}} +, YP0 4: such as Ce ₃ + is used.

An example of a conventional ultraviolet lamp will be briefly described. The ultraviolet-emitting fluorescent lamp disclosed in Patent Document 1 is an ultraviolet-emitting fluorescent lamp suitable for a photocatalyst having an improved near-ultraviolet intensity using an ultraviolet light-emitting substance. A matrix composed of an oxygen compound is doped with a rare earth element involved in luminescence composed of gadolinium and praseodymium, which are luminescence centers, to obtain an ultraviolet light-emitting substance. The inner wall surface of the light-transmissive airtight envelope made of soda glass tube, ultraviolet luminescent material (YB0 _3: Gd, Pr, etc.) to form a phosphor layer made of, enclosing the electrodes and xenon gas into the glass tube. The outer surface of the glass tube forms a photocatalyst layer made of Ti0 ₂ anatase crystal form. When a high-frequency voltage is applied to the cold cathode to generate a discharge and xenon emits 172 nm vacuum ultraviolet rays, the phosphor layer efficiently emits near ultraviolet rays. The photocatalytic layer exhibits a photocatalytic action by near-ultraviolet light.

The ultraviolet discharge tube for a photocatalyst disclosed in Patent Document 2 is an ultraviolet irradiation lamp that can efficiently irradiate ultraviolet light having a wavelength of 300 to 450 nm that activates the photocatalyst. The A fluorescent material that emits ultraviolet light with a wavelength of 450 nm or less that activates the photocatalyst is attached to the outer peripheral surface of an ultraviolet discharge tube made of ultraviolet transmitting glass. Examples of a phosphor that emits ultraviolet light include those disclosed in Patent Document 3.

On the other hand, as disclosed in Non-Patent Documents 1 to 3, there are known methods for producing a long-life lamp with good luminous efficiency by forming a carbon film on a cathode of a field emission lamp by a CVD method. However, a field emission lamp that generates ultraviolet light has not been realized.

(Patent Document 1) JP 2001-172624 A

(Patent Document 2) Japanese Patent Application Laid-Open No. 2002-167235

(Patent Document 3) JP-A-10-204430

(Non-Patent Document 1) A. N. Obraztsov, et al .; "Field emission characteristics oi nanostructured thin film carbon materials", Applied Surface Science 215, (2003) 214-221.

(Non-Patent Document 2) A. N. Obraztsov, et al .; "CVD growth and field emission properties of nanostructured carbon films", J. Phys. D: Appl. Phys. 33 (2002) 337- ^ 62.

(Non-Patent Document 3) A. N. Obraztsov, et al .; "Chemical vapor deposition of carbon films: in-situ plasma diagnostics", Carbon 41 (2003), 836-839.

However, the conventional ultraviolet lamp has a problem that a long-life planar light-emitting lamp that can be used for activating a photocatalyst cannot be realized, and that miniaturization is difficult. An object of the present invention is to solve the above-mentioned conventional problems and to realize a long-life flat field emission ultraviolet lamp for photocatalytic activation. Disclosure of the invention

In order to solve the above-mentioned problems, in the present invention, a field emission ultraviolet lamp is provided with a planar visible light ultraviolet light transmissive cathode-side substrate and a plurality of straight lines arranged in parallel on the cathode-side substrate. -Shaped cathode conductor, an anode-side insulating substrate disposed opposite to the cathode-side substrate and having a groove corresponding to each cathode conductor, an anode conductor provided in the groove, and ultraviolet light applied on the anode conductor And a vacuum container for accommodating a cathode-side substrate and an anode-side insulating substrate. In addition, a carbon film is formed on the anode side surface of the cathode conductor by a CVD method. Brief Description of Drawings

FIG. 1 is a perspective view and a partial cross-sectional view of a field emission ultraviolet lamp according to Embodiment 1 of the present invention,

FIG. 2 is a sectional view of the field emission ultraviolet lamp according to the first embodiment of the present invention,

FIG. 3 is a plan view of the field emission ultraviolet lamp according to the first embodiment of the present invention,

FIG. 4 is a cross-sectional view of the field emission ultraviolet lamp according to the second embodiment of the present invention,

FIG. 5 is a cross-sectional view of a photocatalyst device according to Embodiment 3 of the present invention,

FIG. 6 is a sectional view of a photocatalyst device according to a fourth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. 1 to 6.

(Example 1)

In Example 1 of the present invention, a plurality of linear cathode conductors each having a graphite oxide film formed on the anode side surface by a CVD method were arranged in parallel on a planar visible-ultraviolet-light-transmissive cathode-side glass substrate. Then, grooves corresponding to the respective cathode conductors are provided on the anode-side glass substrate arranged opposite to the cathode-side glass substrate, the anode conductors are provided in the grooves, and a phosphor or semiconductor that generates ultraviolet light is applied on the anode conductors. This is a field emission ultraviolet lamp in which a cathode side glass substrate and an anode side glass substrate are housed in a vacuum vessel.

The configuration and manufacturing method of the field emission ultraviolet lamp according to the first embodiment of the present invention will be described. FIG. 1 is a perspective view and a partial cross-sectional view of a field emission ultraviolet lamp according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the field emission ultraviolet lamp. FIG. 3 is a plan view of the field emission ultraviolet lamp. These are schematic conceptual diagrams, and the ratio of each part is different from the actual one. In FIGS. 1 to 3, the cathode-side glass substrate 1 is a flat substrate on the side from which ultraviolet rays are radiated, and transmits visible light to ultraviolet light, that is, transmits light in the range from visible light to ultraviolet light. It is a transparent glass substrate. The anode-side glass substrate 2 is an insulating substrate having a groove. The anode side glass substrate 2 is disposed so as to face the cathode side glass substrate 1. In the first embodiment, a glass substrate is used as the cathode-side substrate and the anode-side substrate, but the material is not necessarily glass. The cathode-side substrate may be any insulator that is transparent to light in the blue to near-ultraviolet range and is not degraded by ultraviolet rays. The anode-side substrate may be any insulator that does not deteriorate with ultraviolet rays, and for example, a ceramics substrate may be used.

The cathode conductor 3 is a linear electrode arranged in parallel on the cathode-side glass substrate 1. The anode conductor 4 is an electrode deposited in the groove. The phosphor 5 is a phosphor or a semiconductor that generates ultraviolet light applied on the anode conductor. The vacuum container 6 is a container for accommodating the cathode-side glass substrate 1 and the anode-side glass substrate 2. The groove 7 is a groove formed in the anode-side glass substrate 2 for providing an anode. The carbon film 8 is a carbon film formed on the cathode conductor by a CVD method in order to enhance the electron emission efficiency. On a flat cathode-side glass substrate 1, a plurality of linear Ni cathode conductors 3 are arranged in parallel at equal intervals. For the cathode conductor 3, Fe, Cu, or the like can be used in addition to Ni. The thickness of the cathode conductor 3 is made sufficiently small with respect to the size of the groove 7 so that ultraviolet rays are radiated evenly. You can use a diffuser or a polarizing plate to make the brightness uniform. On the anode side surface of the cathode conductor 3, a carbon film 8 of graphite is formed by a CVD method. What is the thickness of the carbon film 8? > m. By appropriately controlling the conditions of the CVD method, the density of the electron emission points of the carbon film 8 on the cathode conductor 3 can be made 10 ⁷ / cm ² . For non-patent documents 1 to 3, refer to Non-Patent Documents 1 to 3 for a method of forming a graphite film by the CVD method.

Grooves 7 corresponding to the respective cathode conductors 3 are provided on the glass substrate 2 on the anode side. An anode conductor 4 formed by depositing an A1 or ITO film is provided in the groove 7. The thickness of the anode conductor 4 is 1-2 μm. The anode conductor 4 also functions as a reflector in the case of A1. In order to reflect light in a wide wavelength range, it is effective to use a dielectric multilayer under the transparent electrode. On the anode conductor 4, a phosphor 5 which is an ultraviolet light emitting crystal film is formed. To achieve. Ultraviolet light emitter crystal films are formed by applying phosphors or semiconductor crystals that generate ultraviolet light by irradiating an electron beam or the like to form a film. Light can be emitted by electrons emitted when a voltage of V or more is applied. A voltage much lower than that of a conventional ultraviolet lamp is sufficient. As the phosphor or semiconductor that generates ultraviolet rays, a substance that meets the conditions may be selected from known substances.

The distance between the electrodes of the cathode conductor 3 and the anode conductor 4 is about 0.5 to 1.0 mm because the ultraviolet light emitting crystal film has about 0.2 to 0.5 mm. Therefore, the size of the groove 7 is almost the same. The cathode-side glass substrate 1 and the anode-side glass substrate 2 are brought into close contact with each other and housed in a vacuum vessel 6. The cathode-side glass substrate 1 and the anode-side glass substrate 2 can be directly welded together without using the vacuum vessel 6 and sealed in a vacuum. The degree of vacuum 10 -. A ¹ ~ l (r ⁵ torr overall size from about 10 mm X 10 mm, can greatly up to about lm X lm.

The operation of the field emission ultraviolet lamp according to the first embodiment of the present invention configured as described above will be described. A unipolar pulse voltage is applied between the cathode conductor 3 and the anode conductor 4. The voltage is 5 to 500V and the current is about 1mA. The voltage can be as high as 10 kV. The frequency is between 1 and 5 kHz. The pulse width is 3-8 / sec. The discharge starting voltage is 1 V / m. The current density of the cathode is 100 mA / cm ² (at 10 V / m). The basic configuration of the lighting power supply may be the same as that of the conventional field emission lamp. The lighting power source may be provided separately for one or more sets of the cathode conductor 3 and the anode conductor 4, or may be provided in common for all sets.

When a voltage is applied between the cathode conductor 3 and the anode conductor 4, cold cathode electrons fly out of the carbon film on the cathode conductor 3 due to field emission, hit the phosphor 5 and generate ultraviolet rays. The light emitted from the phosphor 5 is emitted directly from the cathode-side glass substrate 1 and is emitted from the cathode-side glass substrate 1 after being reflected by the anode conductor 4 and the dielectric multilayer film below the conductor. Brightness is about 200,000 cd / m ^2. The luminous efficiency is about 30%. The lamp life is about 50,000 hours. In this way, the life of the field emission ultraviolet lamp can be extended while the light emitting surface is made flat. By forming a photocatalyst layer on the outside of the cathode-side glass substrate 1, an ultraviolet lamp and a photocatalyst can be integrally formed. In this case, the anode conductor 4 uses A1 or the like to be a reflection plate. In order to increase the amount of light, it is effective to arrange a dielectric multilayer film corresponding to a wide wavelength range below the transparent electrode. If an ITO film is used as the anode conductor 4, a photocatalyst layer can be formed outside the glass substrate 2 on the anode side, and the ultraviolet lamp and the photocatalyst can be integrally formed. Irrespective of whether ultraviolet light is emitted from any surface of the lamp, if a photocatalyst is applied to a surface separate from the lamp, the ultraviolet light may be irradiated with an ultraviolet light emitting lamp without a photocatalytic layer.

As described above, in Example 1 of the present invention, a field emission ultraviolet lamp was formed on a flat cathode-side glass substrate and a plurality of linear cathodes in which a graphite film was formed on the anode-side surface by a CVD method. Conductors are arranged in parallel, grooves corresponding to each cathode conductor are provided on the anode-side glass substrate facing the cathode-side glass substrate, the anode conductor is provided in the groove, and fluorescent light that generates ultraviolet light on the anode conductor Since the body is applied and the cathode-side glass substrate and the anode-side glass substrate are housed in a vacuum container, a long-life flat ultraviolet lamp for photocatalytic activation can be realized.

(Example 2)

In Example 2 of the present invention, a cathode conductor was provided on almost the entire surface of a flat cathode-side glass substrate, and thereafter, a graphite film was formed by a CVD method, and the visible conductor was placed facing the cathode-side glass substrate. A field in which an anode conductor is provided on almost the entire surface of the anode-side glass substrate that transmits light and ultraviolet light, a phosphor that generates ultraviolet light is provided on the anode conductor, and the cathode-side glass substrate and the anode-side glass substrate are housed in a vacuum container. It is an emission UV lamp.

FIG. 4 is a cross-sectional view of a field emission ultraviolet lamp according to Embodiment 2 of the present invention. These are schematic conceptual diagrams, and the ratio of each part is different from the actual one. In FIG. 4, the cathode-side glass substrate 1 is a planar insulating substrate on the side from which no ultraviolet light is emitted. The anode-side glass substrate 2 is a flat substrate on the side from which ultraviolet rays are emitted, and is a glass substrate that transmits visible light and ultraviolet light, that is, transmits light in a range from visible light to ultraviolet light. The anode-side glass substrate 2 is arranged to face the cathode-side glass substrate 1. In Example 2, the cathode side substrate and the anode side substrate were glass-based. Although a plate is used, the material is not necessarily limited to glass.

The cathode conductor 3 is an A1 electrode provided on almost the entire surface of the cathode-side glass substrate 1. The anode conductor 4 is a transparent electrode provided on almost the entire surface of the anode-side glass substrate 2. The phosphor 5 is a phosphor or a semiconductor provided on the anode conductor and generating ultraviolet light. The vacuum container 6 is a container for housing the cathode-side glass substrate 1 and the anode-side glass substrate 2. The carbon film 8 is a carbon film formed on a cathode conductor by a CVD method in order to enhance electron emission efficiency.

Almost the cathode conductor 3 is provided on the entire surface of the flat cathode-side glass substrate 1 by vapor deposition or the like. On the anode-side surface of the cathode conductor 3, a graphite carbon film 8 is formed by a CVD method. The thickness of the carbon film 8 is 2-3 _μm . By appropriately controlling the conditions of the CVD method, the density of the electron emission points of the carbon film 8 on the cathode conductor 3 can be made 107 cm ² . For non-patent documents 1 to 3, refer to Non-Patent Documents 1 to 3 for a method of forming a graphiteite film by the CVD method.

A transparent conductive film is deposited on almost the entire surface of the anode-side glass substrate 2 to form an anode conductor 4. The thickness of the anode conductor 4 is 1 to 2 m. On the anode conductor 4, a phosphor 5 as an ultraviolet light emitting crystal film is formed. The ultraviolet light emitting crystal film is formed by applying a phosphor or semiconductor crystal that generates ultraviolet light to form a film, and emits ultraviolet light by excitation light or an excitation electron beam of 3.0 eV or more. Light can be emitted by applying a voltage of 3.0 V or more using the cathode of the field emission, and a voltage much lower than that of a conventional ultraviolet lamp is sufficient.

The distance between the electrodes of the cathode conductor 3 and the anode conductor 4 is about 0.5 to 1. Oram because the ultraviolet light emitting crystal film is about 0.2 to 0.5 mm. The cathode-side glass substrate 1 and the anode-side glass substrate 2 are brought into close contact with each other and housed in a vacuum vessel 6. The cathode-side glass substrate 1 and the anode-side glass substrate 2 may be directly welded to each other without using the vacuum vessel 6, and may be sealed in a vacuum. Degree of vacuum 10 - a ¹ ~ 10- ⁵ torr. The overall size is about 10mm x 10mm, but can be as large as about 1m x 1m. If the size is to be increased, bosses or ribs are provided as needed to maintain the gap between the cathode-side glass substrate 1 and the anode-side glass substrate 2.

The field emission purple according to the second embodiment of the present invention configured as described above. 3 014471 The basic operation of the outside line lamp is the same as in the first embodiment. When a voltage is applied between the cathode conductor 3 and the anode conductor 4, the cold cathode electron jumps out of the carbon film on the cathode conductor 3 due to field emission, hits the phosphor 5 and generates ultraviolet rays. Light emitted from the phosphor 5 is emitted from the glass substrate 2 on the anode side.

As described above, in Example 2 of the present invention, a field emission ultraviolet lamp was formed on almost the entire surface of a flat cathode-side glass substrate, and a cathode conductor having a graphite film formed on the anode-side surface by a CVD method. An anode conductor is provided on almost the entire surface of the anode-side glass substrate disposed opposite to the cathode-side glass substrate, and a phosphor that generates ultraviolet light is provided on the anode conductor, and the cathode-side glass substrate and the anode-side glass substrate are provided. And a long-life flat ultraviolet lamp for activating the photocatalyst can be realized. Conventional ultraviolet light-emitting lamps were limited to those using light emission using gas, so that a flat light emitter could not be realized.However, by making a flat light emitter like the present invention, a photocatalyst can be used. The place and the range of application can be expanded. For example, light

Photocatalysts can be used efficiently even in refrigerators that do not allow sunlight (sunlight), hospitals, homes and restaurants. It can be used for indoor sterilization, deodorization and deodorization, and its reaction rate can be controlled to some extent by changing the intensity of ultraviolet light.

(Example 3)

In Example 3 of the present invention, a plurality of linear cathode conductors each having a graphite oxide film formed on the anode side surface by a CVD method were arranged in parallel on a planar visible-light-ultraviolet-transmissive cathode-side glass substrate. At the same time, a photocatalyst is applied to the outer dimples of the cathode-side glass substrate, and grooves corresponding to the respective cathode conductors are provided on the anode-side glass substrate disposed opposite to the cathode-side glass substrate, and the transparent anode conductor is provided in the groove. This is a photocatalytic device in which an anode conductor is coated with an alumina phosphor that emits ultraviolet light, and a dielectric multilayer film is provided below the anode conductor.

FIG. 5 is a sectional view of a photocatalyst device according to a third embodiment of the present invention. In FIG. 5, a cathode-side glass substrate 1 is a flat substrate on the side from which ultraviolet rays are emitted, and is a glass substrate that transmits light in a range from visible rays to ultraviolet rays. The anode-side glass substrate 2 is an insulating substrate having a groove. In Example 3, the cathode side substrate and the anode The force material using the glass substrate as the side substrate does not necessarily have to be glass. The phosphor 5 is an alumina phosphor applied on the anode conductor and generating ultraviolet rays. This is a well-known phosphor alumina A1 ₂ 0 ₃ were mixed such aluminates, simply referred to as alumina phosphor for simplicity here. The optimum alumina phosphor may be selected according to the purpose and conditions such as the excitation voltage and the emission wavelength. Phosphor

5 may be a semiconductor such as GaN which emits ultraviolet fluorescence when excited by an electron beam. The dielectric multilayer film 9 is a film for increasing light reflection efficiency. Photocatalyst 10 is a titania Tio ₂ having a deodorant effect by ultraviolet. The dimple portion 11 is a depression for increasing the surface area of the photocatalyst 10. Cathode-side glass substrate 1 and anode-side glass substrate 2 are directly welded and sealed in a vacuum. Other configurations are the same as in the first embodiment.

To increase the surface area of the photocatalytic substance, a dimple structure is provided on the upper transparent substrate (cathode-side glass substrate 1). Dielectric multilayer film to reflect light of various wavelengths

9 is placed under the transparent anode electrode (anode conductor 4). The anode conductor 4 does not necessarily need to use a transparent electrode (ITO). By using aluminum as the anode conductor 4, an alumina phosphor layer may be formed on aluminum.

The basic operation of the lamp unit of the photocatalyst device according to the third embodiment of the present invention configured as described above is the same as that of the first embodiment. When a voltage is applied between the cathode conductor 3 and the anode conductor 4, cold cathode electrons fly out of the carbon film on the cathode conductor 3 by field emission, hit the phosphor 5 and generate ultraviolet rays. Ultraviolet light emitted from the phosphor 5 strikes the photocatalyst 10. Ultraviolet light that has exited the phosphor 5 and has passed through the anode conductor 4 is reflected by the dielectric multilayer film 9 and hits the photocatalyst 10. Chitayua Ti0 ₂ photocatalytic 10 performs like more deodorant effect to ultraviolet radiation.

As described above, in Example 3 of the present invention, a plurality of photocatalyst devices were formed by forming a graphite film on the anode-side surface by a CVD method on a planar visible-ultraviolet-light-transmissive cathode-side glass substrate. In addition to arranging the linear cathode conductors in parallel with each other, applying a photocatalyst to the dimples on the outside of the cathode-side glass substrate, and placing each cathode conductor on the anode-side glass substrate arranged opposite to the cathode-side glass substrate Provide a corresponding groove, provide a transparent anode conductor in the groove, apply an alumina phosphor that generates ultraviolet light on the anode conductor, and under the anode conductor Since the configuration is such that a dielectric multilayer film is provided, a long-life thin planar photocatalyst device can be realized.

(Example 4)

In Example 4 of the present invention, a plurality of linear cathode conductors each having a graphite film formed on the anode side surface by a CVD method were arranged in parallel on a flat cathode-side glass substrate to correspond to the cathode conductor. A visible-ultraviolet-light-transmissive anode-side glass substrate is placed facing the cathode-side glass substrate, a transparent anode conductor is provided inside, and an alumina phosphor that generates ultraviolet light is coated on the anode conductor Then, a photocatalyst device in which a photocatalyst is applied to a dimple portion on the outside of the anode-side glass substrate.

FIG. 6 is a sectional view of a photocatalyst device according to a fourth embodiment of the present invention. In FIG. 6, the cathode side glass substrate 1 is a planar insulating substrate. The anode-side glass substrate 2 is a groove-shaped substrate on the side from which ultraviolet light is emitted, and is a glass substrate that transmits light in a range from visible light to ultraviolet light. In the fourth embodiment, a glass substrate is used as the cathode side substrate and the anode side substrate. The force material is not necessarily glass. The cathode-side glass substrate 1 and the anode-side glass substrate 2 are directly welded, evacuated and sealed. Other configurations are the same as those of the third embodiment.

The difference from the photocatalyst device of Example 3 is that the direction of the electron beam and the direction of the emitted light are the same. In other words, it is the reverse structure of FIG. In this case, the direct light passes through the transparent electrode, and thus no dielectric multilayer is needed. Since there is light that escapes as much as the structure is simple, the amount of light may be lower than that of the photocatalyst device of the third embodiment. Ga can also be used as the phosphor 5. The peak wavelength of GaN fluorescence is 360 nm. Since GaN is a semiconductor and can be used as it is as an anode, it is not always necessary to use a transparent electrode (ITO) as the anode conductor 4.

The basic operation of the photocatalyst device according to the fourth embodiment of the present invention configured as described above is the same as that of the third embodiment. When a voltage is applied between the cathode conductor 3 and the anode conductor 4, cold cathode electrons fly out of the carbon film on the cathode conductor 3 due to field emission, hit the phosphor 5 and generate ultraviolet rays. Ultraviolet light that has exited the phosphor 5 and passed through the anode conductor 4 hits the photocatalyst 10. Titania Ti0 ₂ photocatalytic 10 performs deodorant effect by ultraviolet rays. As described above, in Example 4 of the present invention, the photocatalyst device was formed by arranging a plurality of linear cathode conductors each having a graphite oxide film formed on the anode-side surface by a CVD method on a flat cathode-side glass substrate in parallel. The anode-side glass substrate with a groove-shaped visible-ultraviolet light transmissivity corresponding to the cathode conductor is arranged opposite to the cathode-side glass substrate, a transparent anode conductor is provided inside, and ultraviolet light is applied on the anode conductor. Since the generated alumina phosphor is applied and the photocatalyst is applied to the outer dimple portion of the glass substrate on the anode side, a flat photocatalyst device having a long life and a short life can be realized. Industrial applicability

According to the present invention, a flat emission type field emission ultraviolet lamp having a long life and being optimal for activating a photocatalyst can be realized by the above configuration. Due to the miniaturization, the lamp can be installed in various narrow spaces where sunlight cannot reach, and the use of photocatalysts can be expanded.

The field emission ultraviolet lamp of the present invention is most suitable as a light source for activating a photocatalyst. It can also be used as a general-purpose ultraviolet light source. The photocatalyst device of the present invention is most suitable for applications such as deodorization and sterilization.

Claims

The scope of the claims

1. a planar visible light-ultraviolet light-transmissive cathode-side substrate, a plurality of linear cathode conductors disposed in parallel on the cathode-side substrate, and opposed to the cathode-side substrate; An anode-side insulating substrate having a groove corresponding to each cathode conductor; an anode conductor provided in the groove; a phosphor or a semiconductor applied to the anode conductor that generates ultraviolet light; and the cathode-side substrate. And a vacuum vessel containing the anode-side insulating substrate and a field emission ultraviolet lamp.

2. A flat cathode-side insulating substrate, a cathode conductor provided on almost the entire surface of the cathode-side substrate, and a visible-ultraviolet-light-transmissive anode-side substrate disposed to face the cathode-side substrate. A plate, a visible-ultraviolet-light-transmissive anode conductor provided on substantially the entire surface of the anode-side substrate, a phosphor or semiconductor provided on the anode conductor, and generating ultraviolet light, and the cathode-side insulating substrate. A field emission ultraviolet lamp, comprising: a vacuum container that houses the anode-side substrate.

3. The field emission ultraviolet lamp according to claim 1, wherein a carbon film is formed on the anode-side surface of the cathode conductor.

4. The method for manufacturing a field emission ultraviolet lamp according to claim 3, wherein a carbon film is formed on the anode-side surface of the cathode conductor by a CVD method. Method.

5. A planar visible-ultraviolet light-transmissive cathode-side substrate, a photocatalyst applied to a dimple portion outside the cathode-side substrate, and a plurality of straight lines arranged in parallel inside the cathode-side substrate A cathode conductor, an anode-side insulating substrate disposed to face the cathode-side substrate and having a groove corresponding to each of the cathode conductors, a dielectric multilayer film provided in the groove, and the dielectric multilayer film A photocatalyst device comprising: an anode conductor provided thereon; and a phosphor or semiconductor that generates ultraviolet light and is applied on the anode conductor.

6. A flat cathode-side insulating substrate, a plurality of linear cathode conductors arranged in parallel inside the cathode-side insulating substrate, and a groove-shaped shape arranged opposite to the cathode conductor. The anode-side substrate, which is transparent to visible light and ultraviolet light, is coated on the dimple portion outside the anode-side substrate. A photocatalyst device comprising: a coated photocatalyst; a transparent anode conductor provided inside the anode-side substrate; and a fluorescent substance or semiconductor applied to the transparent anode conductor to generate ultraviolet light. .