TWI297169B - Field emission illumination light source and method for making the same - Google Patents

Description

1297169 • IX. Description of the Invention: [Technical Field] The present invention relates to a field emission illumination source and a method of fabricating the same, and more particularly to a method for effectively maintaining the vacuum required for normal operation in the interior thereof by a getter Field emission illumination source and method of manufacturing the same. [Prior Art] According to the conventional illumination source, the illumination source is mostly an incandescent lamp or a fluorescent tube. Incandescent lamps have a long history and simple manufacturing process. However, most of the energy consumed is converted into heat energy, which is not directly used for illuminating, so its biggest drawback is the low luminous efficiency. A conventional fluorescent tube includes a transparent glass tube whose inner wall is coated with a white or colored fluorescent material, and the glass tube is also filled with mercury vapor. The principle of the ordinary fluorescent tube is that the electrons emitted by the hot cathode excite the mercury vapor to emit ultraviolet light, and the ultraviolet light emits white light on the fluorescent material.

Or colored light. The fluorescent tube is a hot cathode light source with higher luminous efficiency than incandescent lamps. However, the mercury vapor used in the fluorescent lamp is toxic. When the fluorescent tube is broken, the mercury vapor flowing out will be harmful to the environment and the human body. In order to solve the above problems, a field emission illumination source is provided which includes a cathode and an anode disposed corresponding to the cathode. The cathode surface is provided with an electroluminescent layer, and the anode and the electron-emitting layer are provided with a phosphor layer. When a constant electricity is applied between j and the anode, the cathode emits a layer of light that is damaged by the electrons. However, the luminous efficiency is high, and there is no danger to the environment and the human body. (10) ====== 1297169 There are two types, namely, evapotranspiration and concentrated non-evaporable. - In the case of an evaporable getter, a planar structure is placed inside the field emission illumination source to form a getter layer by a pre-evaporation process. However, the getter may increase the manufacturing cost, and may also cause a short circuit or electric leakage between the electrode leads, resulting in failure of the light source. For concentrated non-evaporable getters, they are placed centrally on the mounting head of the field emission illumination source. However, the vacuum inside the field emission light source is close to the getter, and the vacuum is poor at the position away from the getter, thus affecting the field emission illumination source.

In view of this, it is indeed necessary to provide a field emission illumination source that effectively maintains the vacuum required for normal operation inside. SUMMARY OF THE INVENTION A field emission illumination source and a method of fabricating the same will be described below by way of example, which can effectively maintain the vacuum required for normal operation inside it to ensure its good working quality. A field emission illumination source comprising a sealed transparent glass envelope, an anode formed on the inner wall of the glass envelope, a fixed connection to one end of the glass envelope, and a cathode. The anode includes an anode lead formed on the inner wall of the glass envelope, a layer, a phosphor layer formed on the anode conductive layer, and an anode electrode. One end of the anode electrode is in communication with the anode conductive layer, and the other end is in communication with the lamp cap. The cathode system includes a cathode electrode in communication with the lamp cap and insulated from the anode electrode, and an electron emitter fixed to the cathode electrode at one end away from the lamp cap. Wherein the electron emitter comprises a metal conductor and an electron emission layer formed on a surface of the metal conductor. The electron emission layer contains getter particles, naphthalene, conductive metal particles, and glass. - Seed production (four) Ming light source manufacturing method, the financial system includes the following steps: Provide suction ship particles, conductive metal particles, Lang particles and nano 1297169 material, glass shell with anode conductive layer and fluorescent layer, anode electrode a cathode electrode, a metal conductor, and a lamp cap; the getter particles, the conductive metal particles, the glass particles, and the nano material are thoroughly mixed in an organic carrier to form a slurry; and the slurry is applied to the surface of the metal conductor; The metal conductor coated with the slurry is dried and calcined at 300 to 600 ° C to form an electron emission layer on the surface of the metal conductor to obtain an electron emitter;

The glass casing, the anode electrode, the cathode electrode and the electron emitter are assembled, and a sealing material is added to the opening of the neck of the glass casing, and is heated to 400 to 500 ° C, and the sealing material is melted to fix the anode electrode, the cathode electrode and the electron emission. The body forms a sealed space inside the glass casing, and the lamp cap is assembled to the neck of the glass casing and connected to the anode electrode and the cathode electrode respectively to obtain a field emission illumination source. The getter particles in the field emission illumination source are dispersed in the cathode electron emission layer, which can effectively absorb the gas emitted from the phosphor layer or enter the gas inside the field emission illumination source for various other reasons, thereby maintaining the field emission illumination. The inside of the light source has a good vacuum to improve its quality of use. [Embodiment] Hereinafter, a structure of a field emission illumination light source 10 of the present embodiment and a method of manufacturing the same will be described in detail with reference to the accompanying drawings. Referring to Fig. 1, the field emission illumination source 10 of the present embodiment comprises a transparent glass casing 20, an anode 30 formed on the inner wall of the glass casing 20, and a lamp cap 40 and a cathode 50 fixedly connected to one end of the glass casing. The glass casing 20 includes a head portion 22 and a neck portion 24 extending from the head portion 22 and having an opening. The bottom end opening of the neck portion 24 is sealed by a sealing material to form a sealed space in the glass casing 20. 1297169, ellipsoidal, water droplets of the head 22 is a circle, the shape of the portion 22 can be made into a spherical shape or other city as needed, the glass casing 20 shown in Figure 1 is deep.

The lamp cap 40 is fixedly mounted on the glass casing 2, such as materials or materials. The light source 10 is mounted on a lamp holder or other Ξ2= type: screw device, which can be made into a buckle i-shaped form according to actual needs. The lamp head shown in Fig. 1 is 4° outside. Referring to FIG. 2, the anode 30 includes an anode conductive layer 32, a phosphor layer 34 disposed on the anode conductive layer 32, and an anode electrode 36 connected to the anode anode conductive layer. The anode conductive layer 32 covers the inner wall of the head 22 of the glass outer casing 20 and extends to the inner wall of the glass casing 2, the neck portion 24, which is a transparent conductive film. Preferably, transparent indium tin oxide is used as the anode conductive layer 32. . The phosphor layer 34 may cover only the inner wall of the head 22 of the glass peripheral 20 or both the inner wall of the head 22 and the inner wall of the neck 24. The phosphor layer 34 should be a phosphor layer with high photoelectric conversion efficiency, low application voltage and long afterglow. The phosphor of the phosphor layer 34 can be white phosphor or color phosphor according to actual needs. Optionally, an aluminum film (not shown) may be disposed on the surface of the phosphor layer 34 to prevent premature aging of the phosphor material and to increase the brightness of the light source. The anode electrode 36 includes an anode lead ring 360 disposed on the anode conductive layer 32, an anode lead post 362, and two anode connection leads 364. The anode lead ring 360 is disposed at an inner wall of the neck portion 24 of the glass envelope 20 near the edge of the anode conductive layer 32. The anode lead post 362 is disposed in parallel with the inner wall of the glass casing neck portion 24, and is fixed by the sealing material of the glass envelope 20. The anode lead post 362 is disposed at the inner end of the glass casing 20, and one end thereof is connected to the anode by an anode connecting lead 364.

10 1297169 The wire loop 360 is electrically connected, and the other end is extended outward by the sealed end of the glass casing 20 and is connected to the base 40 by another anode connecting lead 364. The anode lead ring 360, the anode lead post 362 and the anode connecting lead 364 are each made of a conductive material such as copper. The anode electrode 36 is disposed for the purpose of providing electrical connection between the lamp cap 40 and the anode conductive layer 32. Therefore, the structure of the anode electrode 36 can be other forms. For example, the anode electrode 36 is only connected to the anode conductive layer and the conductive wire or the conductive material of the lamp cap. a column (not shown), or the anode electrode 36 includes an anode lead ring

And a conductive post or a conductive wire connected to the anode lead ring and the lamp cap respectively. The cathode 50 is disposed within the glass envelope 2 and the base 4, and includes an electron emitter 52 and a cathode electrode 54. The cathode electrode 54 includes an electrode tip 540, a cathode connection lead 542 connecting the electrode tip 54 and the electron emitter 52, and a glass post 544 which is hollow and internally houses the cathode connection 542. The electrode tip 54 is disposed on the top of the base 40 away from the glass envelope 20, and the cathode connection leads 542 are each made of a conductive material. One end of the glass post supports the electron emitter 52 and is fixed, and the other end is fixed by the sealing material of the glass casing 20. Referring to ® 3, the electron emitter 52 includes a metal conductor 520 and an electron emission 522 522 formed on the surface of the metal conductor 52. The metal conductor 52Q is made of a conductive metal or an alloy thereof. Alternatively, the metal conductor 520 is made of silver. The metal conductor 52〇 should be opposite to the head 胄22 of the outer glass 352G, which is as standard. The structure of the metal ruthenium cathode electrode 54 shown in FIG. 3 and FIG. 3 can also be in other forms, such as replacing the glass pillar 544 and the cathode connection 542 with an electric column (not shown) to connect the electron emitter 52 and the electrode tip. That is, the cathode 11 1297169 includes an electrode head 540 disposed on the base 40 and a conductive post supporting the electron emitter 52 and connecting it to the electrode head 540. The conductive pillar can be fixed by the sealing material on the glass casing 20 or directly fixed to the electrode head 540. The electron emitter 52 can be welded and fixed to the end of the conductive pillar, or can be directly formed integrally with the conductive pillar. structure.

Referring to FIG. 4, the electron emission layer 522 includes a nano material 530, a glass 532, conductive metal particles 534, and getter particles 536. The getter particles 536 are made of a non-evaporable getter material having a diameter of 1 to 10 μm. Non-evaporable getter is based on surface adsorption or bulk diffusion, mainly composed of Qin, wrong, toe, toe, rare earth metals or alloys thereof, such as bismuth aluminum alloy, electronic slurry grade titanium powder, zirconium vanadium iron. The conductive metal particles 534 are made of silver or indium tin oxide, which ensures electrical connection between the nano material 530 and the metal conductor 520. Preferably, the conductive metal particles 534 are made of silver. The nanomaterial 530 comprises a carbon nanotube or other material capable of being used for field emission, a nanotube, a nanowire, a nanorod or a nanoparticle, and has a length of 5 to 15 micrometers and a diameter of 1 to 100. Nano. Preferably, at least one end of the nanomaterial 530 is exposed on the surface of the electron emission layer 522. In order to ensure insulation between the anode electrode 36 and the cathode electrode 54, an insulating medium 42 may be further disposed on the head 40. The insulating medium 42 is disposed on the electrode head 540 of the cathode electrode 54 and the anode connected to the base 40 of the anode electrode 36. Between the leads 364. The insulating medium 42 is made of an insulating material such as glass or ceramic. In use, the electron emission layer 522 emits electrons under the action of an electric field, and the electrons strike the fluorescent layer 34 of the anode 30. When the fluorescent layer 34 is colored fluorescent material, color light is emitted, and when the fluorescent layer 34 is white fluorescent material. When it is white, it will emit white light. In this process, the getter particles 536 can effectively absorb the fluorescence 1 由于 due to the 12 1297169 Γ=Γί emission layer 522 or the field emission of the other fields. The step of emitting the illumination light (1), providing a certain amount of getter particles = 534 broken glass particles and nano-materials, forming a glass shell 20 with a fluorescent layer 34, an anode electrode 36, a cathode electrode 54, and a metal conductive The body 52 〇 and the lamp holder 4 〇; the getter particles 536 and the conductive metal particles 534 can be ball-milled in advance, so that the getter particles 536 have a diameter of 1 to 1 Gm, and the conductive metal particles 534 have a diameter of 〇. Micron. Preferably, the excitation temperature is selected from 300 to 500. (: suction (four), such as pure alloy getter. · Glass particles are selected from low melting point glass, the main material is osmium tetroxide (Si〇4), the diameter is 1〇~1〇〇N, the melting point is 35〇6 〇〇γ. Nanomaterials, 530 can be prepared by conventional techniques such as chemical vapor deposition, arc discharge or laser evaporation. The length of 5~15 microns is too short to weaken the field emission characteristics of nanomaterials. If the length is too long, the nano-materials 53 are intertwined and agglomerated. The glass casing 20 includes a head portion 22 and a neck portion 24 having an opening, and the inner wall thereof is first formed by evaporation or other means to form the anode conductive layer 32, and then borrowed A phosphor layer 34 is formed on the anode conductive layer 32 by deposition or other means. The anode conductive layer 32 covers the neck portion 24 of the glass envelope 20, and the phosphor layer 34 may cover only the head portion 22 of the glass envelope 2 Or covering both the head portion 22 and the neck portion 24. " Step (2), the getter particles 536, the conductive metal particles 534, the glass particles and the nano-material 530 are thoroughly mixed in the organic carrier 13 1297169 Slurry; organic carrier is derived from terpineol as a solvent a small amount of agent * * ortho-benzoic acid dibutyl vinegar and a small amount of ethyl cellulose as a stabilizer, a mixture of the elements. The mass percentage of the getter particles 536 in the slurry is 40 to 80 ° /., the mixing process Preferably, it is 6〇~8 (rc mixed for 35 hours. In order to better disperse the nano material and obtain a slurry having a uniform diameter of the nano material, ultrasonic vibration of the organic solvent containing the nano material can be further performed using low-power ultrasonic waves, Then, it is centrifuged. Step (3), the slurry is applied to the surface of the metal conductor 52; the coating process should be carried out in a clean environment, preferably, the dust produced by the coating ring should be less than 1000/m3. ^ ^ Step (4), the metal conductor 52 coated with the slurry is dried and fired at 300 to 600 ° C to form an electron emission layer 522 on the surface of the metal conductor 52. The electron emitter 52 is obtained; drying and baking are usually carried out in a vacuum environment or by introducing an inert gas during drying and baking to prevent drying and baking. Oxidation reaction is also prevented. The getter is prevented from being saturated. The organic carrier is volatilized from the metal conductor 520. The purpose of the firing is to melt the glass particles to bond the getter particles 536, the conductive metal particles 534, and the nano-material 530 to the metal conductor 520 to form an electron-emitting layer. 522. In addition, the molten glass 532 can adjust the overall thermal expansion number to prevent the formed electron-emitting layer 522 from being cracked or y to further enhance the field emission characteristics of the electron-emitting layer 522. After the drying and firing process, the electron emission can be performed. The surface of the body 52 is rubbed, and the end of the portion of the nano-material 530 is exposed to the surface of the lightning layer 522. The emission step (5), assembling the glass casing 20, the anode electrode 3 1 and the cathode 1297169 electrode 54 And the electron emitter 52 is provided with a sealing material at the opening of the neck portion 24 of the glass casing 20, and is heated to 400 to 500 ° C, and the sealing material is melted to fix the anode electrode 36, the cathode electrode 54 and the electron emitter 52. A sealed space is formed inside the glass casing 20, and the base 4 is assembled to the flange portion 24 of the glass casing 20 and connected to the anode electrode 36 and the cathode electrode 54 to obtain a field emission. 1〇 illumination source.

The heating process is usually carried out under vacuum or by applying an inert gas during the heating process. The getter particles 536 are excited during the heating. Generally, the sealing material may be a conventional sealing material, such as a low melting point glass powder having a melting point of 350 to 600 C as a sealing material. Since the glass powder particles have a small diameter, the actual melting point is lower than 6 ° C. When heated to 400 to 500 ° C, the glass frit is melted, and after cooling, the molten glass solidifies to fix the anode electrode 36, the cathode electrode 54 and the electron emitter 52 to the inside of the glass envelope 20 and form inside the glass envelope 2 Two sealed spaces. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and those skilled in the art will be able to include the equivalent modifications or variations of the invention in the spirit of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a field emission illumination source in accordance with an embodiment of the present invention. Figure 2 is an enlarged view of a portion II of Figure 1. Figure 3 is a cross-sectional view of the field emission illumination source of Figure 1 taken along the ΙΠ_ΙΠ direction. Figure 4 is an enlarged view of a portion IV of Figure 3. FIG. 5 is a schematic diagram of a method for manufacturing a field emission illumination source according to an embodiment of the present invention. [Main component symbol description]

Field emission illumination source 10 Glass housing 20 Head 22 Neck 24 Anode 30 Anode conductive layer 32 Fluorescent layer 34 Anode electrode 36 Anode lead ring 360 Anode lead post 362 Anode connection lead 364 Lamp cap 40 Insulating medium 42 Cathode 50 Electron emitter 52 Metal Conductor 520 Electron Emission Layer 522 Nano Material 530 Glass 532 Conductive Metal Particles 534 Getter Particles 536 Cathode Electrode 54 Electrode Head 540 Cathode Connection Lead 542 Glass Post 544

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Claims (1)

1297169 X. Patent application scope 1. A field emission illumination source comprising: a sealed glass casing comprising a head and a neck extending from the head and having an opening; a lamp cap fixed to the neck of the glass casing; formed in the glass casing The anode on the inner wall comprises an anode conductive layer formed on the inner wall of the glass envelope, a glory layer formed on the anode conductive layer, and an anode electrode connecting the anode conductive layer and the lamp cap; The cathode mounted in the glass casing and the lamp cap comprises a cathode electrode and an electron emitter fixed at one end of the cathode electrode, the cathode electrode and the anode electrode are insulated from each other and electrically connected to the electron emitter and the lamp cap, and the electron emitter comprises a metal An electric conductor and an electron emission layer formed on a surface of the metal conductor, the electron emission layer containing getter particles, a nano material, conductive metal particles, and glass. 2. The field emission illumination source of claim 1, wherein the getter particles are non-evaporable getters. 3. The field emission illumination source of claim 2, wherein the getter particles have a diameter of 1 to 10 microns. 4. The field emission illumination source of claim 3, wherein the nanomaterial has a length of 5 to 15 microns and a diameter of 1 to 100 nm. 5. The field emission illumination source of claim 3, wherein the anode conductive layer is an indium tin oxide film. 6. The field emission illumination source of claim 3, wherein the anode further comprises an aluminum film disposed on an outer surface of the phosphor layer. 7〜10微米。 The conductive metal particles are selected from the silver or indium tin oxide, the diameter of which is 0. 1~10 microns. 17 1297169 ^ The field emission illumination source of claim 3, wherein the cathode electrode comprises an electrode head disposed on the lamp cap, and a connection between the connection electrode and the cathode of the electron emitter. The glass pillar of the lead. The field emission illumination source of claim 3, wherein the cathode electrode comprises an electrode head disposed on the base, and a conductive post connecting the pole head and the electron emitter. 10. A method of manufacturing a field emission illumination source, comprising the steps of: (1) providing getter particles, conductive metal particles, glass particles and || nano materials, glass having an anode conductive layer and a phosphor layer and having an opening Peripheral (5) pole electrode, cathode electrode, metal conductor and lamp cap; (2) thoroughly mixing getter particles, conductive metal particles, glass particles and nano materials in an organic carrier to form a slurry; The slurry is applied to the surface of the metal conductor; (4) the metal conductor coated with the slurry is dried and fired at 3 〇〇 to 6 〇〇〇c to form an electron on the surface of the metal conductor. The emission layer is used to obtain an electron emitter; (5) assembling a glass casing, an anode electrode, a cathode electrode, an electron emitter, a lamp body, and a lamp cap, and forming a sealed space inside the glass casing, thereby obtaining a field emission illumination source. 11. The method of manufacturing a field emission illumination source according to claim </ RTI> wherein, in the step (1), the getter particles are non-evaporable getters having an activation temperature of 300 to 500. 12. The method of manufacturing a field emission illumination source according to claim 11, wherein in the step (1), the glass particles are low melting glass particles having a melting point of between 350 and 600 ° C and a particle diameter. For 1〇~1 〇〇 nano. The method of manufacturing a field emission illumination source according to claim 12, wherein the anode conductive layer is formed on the inner wall of the glass casing by an evaporation method, and the phosphor is formed in the step (1). The layer is formed on the anode conductive layer by a deposition method. 14. The method for producing a field emission illumination source according to claim 13, wherein in the step (2), the organic carrier is terpineol, ortho-dibutylene dibutylate and ethyl cellulose. Mixture. 15. The method of manufacturing a field emission illumination source according to claim 14, wherein in the step (2), the concentration ratio of the getter particles in the slurry is 40 to 80%. 16. The method of manufacturing a field emission illumination source according to claim 15, wherein in the step (2), the mixing process is carried out at 60 to 80 ° C for 3 to 5 hours. 17. The method of manufacturing a field emission illumination source according to claim 16, wherein in the step (3), the coating process is performed in an environment in which the degree of dust is less than 1000/m3. 18. The method of manufacturing a field emission illumination source according to claim 17, wherein in the step (4), the drying and roasting process is carried out under vacuum or inert gas protection. 19. The method of manufacturing a field emission illumination source according to claim 18, wherein before the step (5), the surface of the electron emission layer of the cathode is rubbed in advance, and the end of the portion of the nano material is exposed to expose the electron. Emissive layer surface. 19