TW201342417A - Fluorescent light emitting apparatus and method of forming fluorescent substance layer thereof - Google Patents
Fluorescent light emitting apparatus and method of forming fluorescent substance layer thereof Download PDFInfo
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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
- H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
- H01J9/22—Applying luminescent coatings
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2209/00—Apparatus and processes for manufacture of discharge tubes
- H01J2209/01—Generalised techniques
- H01J2209/012—Coating
Abstract
Description
本發明涉及螢光發光裝置，諸如螢光顯示裝置；並且，更具體地，涉及螢光發光裝置的螢光物質層和形成螢光物質層的方法。 The present invention relates to a fluorescent light emitting device such as a fluorescent display device; and, more particularly, to a phosphor layer of a fluorescent light emitting device and a method of forming a phosphor layer.
螢光發光裝置包括螢光物質層，光通過由電子源諸如燈絲或場致發光裝置發射的電子而從該螢光物質層發射出。傳統的螢光發光裝置的螢光物質層將參照圖3A至3C描述。 The fluorescent light emitting device includes a layer of phosphor material that is emitted from the layer of phosphor material through electrons emitted by an electron source such as a filament or an electroluminescent device. The phosphor layer of the conventional fluorescent light-emitting device will be described with reference to Figs. 3A to 3C.
圖3A至3C示出形成在的陽極電極上的螢光物質層的放大的剖面視圖，該陽極電極由導體諸如鋁製成並且形成在玻璃基底上。 3A to 3C show enlarged cross-sectional views of a phosphor layer formed on an anode electrode which is made of a conductor such as aluminum and formed on a glass substrate.
參照圖3A至3C，附圖標記11表示玻璃基底，附圖標記12表示陽極電極，並且附圖標記51至53表示螢光物質層。此外，白色大圓61是螢光物質的顆粒，白色小圓62是由超細SiO2(二氧化矽)顆粒等製成的結合劑的顆粒。 3A to 3C, reference numeral 11 denotes a glass substrate, reference numeral 12 denotes an anode electrode, and reference numerals 51 to 53 denote phosphor layers. Further, the white large circle 61 is a particle of a fluorescent substance, and the white small circle 62 is a particle of a binder made of ultrafine SiO 2 (cerium oxide) particles or the like.
螢光物質層傳統上由如圖3A的螢光物質層中所示的螢光物質顆粒61和結合劑顆粒62形成，並且必要時也可以添加導電劑顆粒(未示出)。 The phosphor layer is conventionally formed of the phosphor particles 61 and the binder particles 62 as shown in the phosphor layer of Fig. 3A, and conductive agent particles (not shown) may also be added as necessary.
結合劑顆粒62充當黏合劑，用於將螢光物質層51緊固到陽極電極12上。 The binder particles 62 act as a binder for fastening the phosphor layer 51 to the anode electrode 12.
結合劑顆粒62和導電劑顆粒不是發光性材料；因此，當將其添加到螢光物質層51時，螢光物質層51的亮度降低。具體而言，非發光性顆粒諸如結合劑顆粒62等妨礙了從螢光物質顆粒61輻射出的光束的行進，或者妨礙了從電子源發射出的電子朝向螢光物質顆粒61的行進，從而降低了螢光物質層51的亮度。 The binder particles 62 and the conductive agent particles are not luminescent materials; therefore, when it is added to the phosphor layer 51, the luminance of the phosphor layer 51 is lowered. In particular, non-luminescent particles such as binder particles 62 or the like hinder the progress of the light beam radiated from the phosphor particles 61 or hinder the progress of the electrons emitted from the electron source toward the phosphor particles 61, thereby reducing The brightness of the phosphor layer 51 is obtained.
為了提升螢光物質層51的亮度，在圖3B中公開一種不包括結合劑顆粒和導電劑顆粒的螢光物質層52(參見日本專利申請公開No.2011-49095)。 In order to increase the brightness of the phosphor layer 51, a phosphor layer 52 excluding binder particles and conductive agent particles is disclosed in FIG. 3B (see Japanese Patent Application Laid-Open No. 2011-49095).
由於螢光物質層52不包括非發光性顆粒諸如結合劑顆粒和導電劑顆粒，因此螢光物質層52的亮度得以提升。然而，由於螢光物質層52不包括結合劑顆粒，因此在螢光物質層52與陽極電極12之間的結合強度是如此的弱以至於螢光物質層52可能從陽極電極剝離。 Since the phosphor layer 52 does not include non-luminescent particles such as binder particles and conductive agent particles, the brightness of the phosphor layer 52 is improved. However, since the phosphor layer 52 does not include the binder particles, the bonding strength between the phosphor layer 52 and the anode electrode 12 is so weak that the phosphor layer 52 may be peeled off from the anode electrode.
為了提升在螢光物質層與陽極電極之間的結合強度而不降低螢光物質層的亮度，在圖3C中公開一種螢光物質層53，其中結合劑顆粒62僅附著在陽極電極12的表面上(參見日本專利申請公開No.2011-49095)。 In order to increase the bonding strength between the phosphor layer and the anode electrode without lowering the brightness of the phosphor layer, a phosphor layer 53 is disclosed in FIG. 3C in which the binder particles 62 are attached only to the surface of the anode electrode 12. (see Japanese Patent Application Laid-Open No. 2011-49095).
由於結合劑顆粒62是絕緣材料，因此在圖3C的情況 下，如果結合劑顆粒62的分佈密度提高，那麼在螢光物質層53與陽極電極12之間的電阻提高並且螢光物質層53被充能，從而妨礙光的發射。因此，在圖3C的螢光物質層53中，結合劑顆粒62被分散在陽極電極12的表面上。然而，在這種情況下，可能無法獲得在螢光物質層53與陽極電極12之間的足夠的結合強度，導致螢光物質層53的剝離。由此，通過僅將黏結劑顆粒62附著到陽極電極12難以實現預定的結合強度和導電性。 Since the binder particles 62 are insulating materials, in the case of FIG. 3C Next, if the distribution density of the binder particles 62 is increased, the electric resistance between the phosphor layer 53 and the anode electrode 12 is increased and the phosphor layer 53 is charged, thereby hindering the emission of light. Therefore, in the phosphor layer 53 of FIG. 3C, the binder particles 62 are dispersed on the surface of the anode electrode 12. However, in this case, sufficient bonding strength between the phosphor layer 53 and the anode electrode 12 may not be obtained, resulting in peeling of the phosphor layer 53. Thus, it is difficult to achieve a predetermined bonding strength and conductivity by adhering only the binder particles 62 to the anode electrode 12.
在此，作為將結合劑顆粒62附著到陽極電極12的方法，可以通過將添加有預定量結合劑顆粒62的糊料塗覆到陽極電極12並且通過蒸發該糊料的溶劑而將結合劑顆粒62附著到陽極電極12。然而，在這種方法中，將結合劑顆粒62以低密度方式附著到陽極電極12是困難的，因此結合劑顆粒62的分佈密度變高。 Here, as a method of attaching the binder particles 62 to the anode electrode 12, the binder particles may be coated by applying a paste to which a predetermined amount of binder particles 62 are added to the anode electrode 12 and by evaporating the solvent of the paste. 62 is attached to the anode electrode 12. However, in this method, it is difficult to attach the binder particles 62 to the anode electrode 12 in a low density manner, and thus the distribution density of the binder particles 62 becomes high.
如上所述，在傳統螢光發光裝置的螢光物質層中，提升結合強度的同時還提升亮度是困難的。 As described above, in the phosphor layer of the conventional fluorescent light-emitting device, it is difficult to increase the bonding strength while also increasing the brightness.
鑒於以上所述，本發明提供一種螢光發光裝置，該螢光發光裝置包括具有高結合強度和高亮度的螢光物質層，以及提供一種形成所述螢光物質層的方法。 In view of the above, the present invention provides a fluorescent light emitting device comprising a phosphor layer having high bonding strength and high brightness, and a method of forming the phosphor layer.
依照本發明的第一方面，提供一種螢光發光裝置，包括：螢光物質層，通過從電子源發射出的電子而從該螢光物質層發射光，其中螢光物質層包括：形成在陽極電極上 並且由螢光物質和結合劑製成的第一螢光物質層；和層合在第一螢光物質層上並且由螢光物質製成的第二螢光物質層。 According to a first aspect of the present invention, there is provided a fluorescent light emitting device comprising: a phosphor layer that emits light from the phosphor layer by electrons emitted from an electron source, wherein the phosphor layer comprises: formed at the anode On the electrode And a first phosphor layer made of a fluorescent substance and a binder; and a second phosphor layer laminated on the first phosphor layer and made of a phosphor.
依照本發明的第二方面，提供一種螢光發光裝置，包括：螢光物質層，光通過從電子源發射出的電子而從該螢光物質層發射，其中螢光物質層包括：形成在陽極電極上並且由螢光物質、結合劑和導電劑製成的第一螢光物質層；和層合在第一螢光物質層上並且由螢光物質製成的第二螢光物質層。 According to a second aspect of the present invention, there is provided a fluorescent light emitting device comprising: a phosphor layer, the light being emitted from the phosphor layer by electrons emitted from the electron source, wherein the phosphor layer comprises: formed at the anode a first phosphor layer on the electrode and made of a phosphor, a binder, and a conductive agent; and a second phosphor layer laminated on the first phosphor layer and made of a phosphor.
依照本發明的第三方面，提供一種螢光發光裝置，包括：螢光物質層，光通過從電子源發射出的電子而從該螢光物質層發射，其中螢光物質層包括：形成在陽極電極上並且由ZnO：Zn螢光物質、結合劑、導電劑和WO3製成的第一螢光物質層；和層合在第一螢光物質層上並且由ZnO：Zn螢光物質和WO3製成的第二螢光物質層。 According to a third aspect of the invention, there is provided a fluorescent light emitting device comprising: a phosphor layer, the light being emitted from the phosphor layer by electrons emitted from the electron source, wherein the phosphor layer comprises: formed at the anode a first phosphor layer on the electrode and made of a ZnO:Zn phosphor, a binder, a conductive agent, and WO 3 ; and a layer laminated on the first phosphor layer and composed of ZnO:Zn phosphor and WO 3 made of a second layer of phosphor material.
此外，第二螢光物質層的ZnO：Zn螢光物質可以是氧化矽包覆的螢光物質。 Further, the ZnO:Zn phosphor material of the second phosphor layer may be a ruthenium oxide-coated phosphor.
此外，第一螢光物質層的ZnO：Zn螢光物質可以是氧化矽包覆的螢光物質。 Further, the ZnO:Zn phosphor material of the first phosphor layer may be a ruthenium oxide-coated phosphor.
此外，第二螢光物質層的氧化矽包覆的螢光物質的量可以比第一螢光物質層的氧化矽包覆的螢光物質的量大。 Further, the amount of the cerium oxide-coated fluorescent material of the second phosphor layer may be larger than the amount of the cerium oxide-coated fluorescent material of the first phosphor layer.
此外，第二螢光物質層的厚度可以比第一螢光物質層的厚度薄。 Further, the thickness of the second phosphor layer may be thinner than the thickness of the first phosphor layer.
此外，第二螢光物質層的尺寸可以比第一螢光物質層 的尺寸小。 In addition, the second phosphor layer may be larger in size than the first phosphor layer The size is small.
此外，第二螢光物質層的螢光物質的平均直徑比第一螢光物質層的螢光物質的平均直徑小。 Further, the average diameter of the fluorescent substance of the second phosphor layer is smaller than the average diameter of the fluorescent substance of the first phosphor layer.
此外，第一與第二螢光物質層的厚度的和可以等於或小於40μm。 Further, the sum of the thicknesses of the first and second phosphor layers may be equal to or less than 40 μm.
依照本發明的第四方面，提供一種形成螢光發光裝置的螢光物質層的方法，該方法包括：將用於形成第一螢光物質層的第一糊料塗覆到陽極電極；乾燥第一糊料以形成第一螢光物質層；將用於形成第二螢光物質層的第二糊料塗覆到第一螢光物質層；乾燥第二糊料以形成第二螢光物質層；以及烘烤第一和第二螢光物質層。 According to a fourth aspect of the present invention, a method of forming a phosphor layer of a fluorescent light-emitting device, the method comprising: applying a first paste for forming a first phosphor layer to an anode electrode; drying a paste to form a first phosphor layer; a second paste for forming a second phosphor layer to the first phosphor layer; and a second paste to form a second phosphor layer And baking the first and second phosphor layers.
本發明中的螢光物質層包括形成在陽極電極上的第一螢光物質層和層合在第一螢光物質層上的第二螢光物質層。此外，第一螢光物質層由螢光物質和非發光性材料製成，第二螢光物質層由螢光物質製成。因此，螢光物質層被牢牢緊固到陽極電極上，同時其自身亮度提高。 The phosphor layer in the present invention includes a first phosphor layer formed on the anode electrode and a second phosphor layer laminated on the first phosphor layer. Further, the first phosphor layer is made of a fluorescent substance and a non-luminescent material, and the second phosphor layer is made of a fluorescent substance. Therefore, the phosphor layer is firmly fastened to the anode electrode while its own brightness is increased.
本發明中的螢光物質層通過將導電劑添加到第一螢光物質層而提高導電性，但不被充能。 The phosphor layer in the present invention improves conductivity by adding a conductive agent to the first phosphor layer, but is not charged.
在螢光物質層中，第二糊狀物在第一糊狀物乾燥後還未烘烤時立刻塗覆。因此，幾乎不可能的是，第一螢光物質層在第二糊料塗覆時被網版剝離。 In the phosphor layer, the second paste is applied immediately after the first paste has dried without baking. Therefore, it is almost impossible that the first phosphor layer is peeled off by the screen when the second paste is applied.
2‧‧‧螢光物質層 2‧‧‧Fluorescent material layer
11‧‧‧基底 11‧‧‧Base
12‧‧‧陽極電極 12‧‧‧Anode electrode
21‧‧‧第一螢光物質層 21‧‧‧First phosphor layer
22‧‧‧第二螢光物質層 22‧‧‧Second phosphor layer
31‧‧‧螢光物質顆粒 31‧‧‧Fluorescent material particles
32‧‧‧結合劑顆粒 32‧‧‧Binder particles
33‧‧‧導電劑顆粒 33‧‧‧Conducting agent particles
51‧‧‧螢光物質層 51‧‧‧Fluorescent material layer
52‧‧‧螢光物質層 52‧‧‧Fluorescent material layer
53‧‧‧螢光物質層 53‧‧‧Fluorescent material layer
61‧‧‧螢光物質顆粒 61‧‧‧Fluorescent material particles
62‧‧‧結合劑顆粒 62‧‧‧Binder particles
F‧‧‧電子源 F‧‧‧Electronic source
S1~S5‧‧‧步驟 S1~S5‧‧‧Steps
從以下結合附圖給出的對實施方式的描述中，本發明的目的和特徵將會得到顯現，其中： 圖1展示了依照本發明實施方式的螢光物質層的放大剖面視圖。 The objects and features of the present invention will become apparent from the following description of embodiments taken in conjunction with the accompanying Figures 1 shows an enlarged cross-sectional view of a layer of phosphor material in accordance with an embodiment of the present invention.
圖2A和2B是描述依照本發明實施方式的螢光物質層的形成步驟的視圖。 2A and 2B are views for describing a forming step of a phosphor layer in accordance with an embodiment of the present invention.
圖3A至3C描繪了傳統螢光物質層的放大剖面視圖。 3A to 3C depict enlarged cross-sectional views of a conventional phosphor layer.
下文中，本發明的實施方式將會參照成為本文一部分的附圖來描述。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings which are incorporated herein.
依照本發明實施方式的螢光物質層包括在陽極電極上的第一螢光物質層形成和層合在第一螢光物質層上的第二螢光物質層。第一螢光物質層包括非發光性材料諸如結合劑、導電劑等，而第二螢光物質層不包括任何非發光性材料。螢光物質層由兩層構成，其中第一螢光物質層具有提高結合強度和導電性的功能，第二螢光物質層僅具有光發射功能。 The phosphor layer according to an embodiment of the present invention includes a first phosphor layer formed on the anode electrode and a second phosphor layer laminated on the first phosphor layer. The first phosphor layer includes a non-luminescent material such as a binder, a conductive agent, and the like, and the second phosphor layer does not include any non-luminescent material. The phosphor layer is composed of two layers, wherein the first phosphor layer has a function of improving bonding strength and conductivity, and the second phosphor layer has only a light emitting function.
本實施方式中的螢光物質層在兩個螢光物質層之間劃分了螢光物質的主要功能，從而提高了結合強度和亮度。 The phosphor layer in the present embodiment divides the main function of the phosphor material between the two phosphor layers, thereby improving the bonding strength and brightness.
依照本發明的實施方式的螢光物質層將會參照圖1描述。 A layer of phosphor material in accordance with an embodiment of the present invention will be described with reference to FIG.
圖1是在螢光顯示裝置中的陽極電極上形成的螢光物質層的放大剖面視圖。 1 is an enlarged cross-sectional view of a phosphor layer formed on an anode electrode in a fluorescent display device.
參照圖1，附圖標記11表示由絕緣材料諸如玻璃製成的基底，附圖標記12表示由導電材料諸如鋁形成的陽極電 極，附圖標記2表示螢光物質層。白色大圓31是螢光物質的顆粒，白色小圓32是結合劑的顆粒，黑色圓33是導電劑的顆粒，附圖標記F是電子源，諸如通過將電子發射材料諸如三元碳酸鹽沉積在由鎢等製成的芯線的表面上而形成的燈絲。螢光物質(用於低能量電子束)使用ZnO(氧化鋅)：Zn(鋅)，結合劑使用SiO2的超細顆粒(具有數nm至數十nm的平均直徑)，導電劑使用In2O3(氧化銦(III))。此外，在本實施方式中，使用AerosilTM作為SiO2的超細顆粒。 Referring to Fig. 1, reference numeral 11 denotes a substrate made of an insulating material such as glass, reference numeral 12 denotes an anode electrode formed of a conductive material such as aluminum, and reference numeral 2 denotes a phosphor layer. The white large circle 31 is a particle of a fluorescent substance, the white small circle 32 is a particle of a binder, the black circle 33 is a particle of a conductive agent, and the reference numeral F is an electron source such as by depositing an electron-emitting material such as a ternary carbonate. A filament formed on the surface of a core wire made of tungsten or the like. Fluorescent material (for low-energy electron beam) uses ZnO (zinc oxide): Zn (zinc), binder uses ultrafine particles of SiO 2 (having an average diameter of several nm to several tens of nm), and conductive agent uses In 2 O 3 (indium(III) oxide). In the present embodiment, used as Aerosil TM SiO 2 ultrafine particles.
螢光顯示裝置包括在內部提供高真空環境的氣密容器(未示出)。在氣密容器中，配置有基底(未示出)與基底11平行相對，其間具有間隙，並且其週邊由密封材料(未示出)密封。替代地，氣密容器可以是箱形的，其中必要時在相對的基底之間配置有側面構件，並且它們由密封玻璃密封。 The fluorescent display device includes an airtight container (not shown) that provides a high vacuum environment inside. In the hermetic container, a substrate (not shown) is disposed in parallel with the substrate 11 with a gap therebetween, and its periphery is sealed by a sealing material (not shown). Alternatively, the hermetic container may be box-shaped, with side members being disposed between the opposing substrates as necessary, and they are sealed by a sealing glass.
螢光物質層2包括形成在陽極電極12上的第一螢光物質層21和層合在第一螢光物質層21上的第二螢光物質層22。第二螢光物質層22是更靠近電子源F的層。 The phosphor layer 2 includes a first phosphor layer 21 formed on the anode electrode 12 and a second phosphor layer 22 laminated on the first phosphor layer 21. The second phosphor layer 22 is a layer closer to the electron source F.
第一螢光物質層21由螢光物質顆粒31、結合劑顆粒32、和導電劑顆粒33形成。因此，第一螢光物質層21通過結合劑顆粒32牢牢固定到陽極電極12並且由於導電劑顆粒33而具有高導電性。可能有一種情況，即，根據螢光物質的類型而不需要添加導電劑顆粒33，並且在這種情況下僅添加結合劑顆粒32。第二螢光物質層22僅由螢光物質顆粒31形成並且不包括結合劑顆粒32和導電劑顆粒33。由於第二螢光物質層22不包括非發光性顆粒諸如結合劑顆粒32和 導電劑顆粒33，因此其能夠具有高亮度。 The first phosphor layer 21 is formed of phosphor particles 31, binder particles 32, and conductive particles 33. Therefore, the first phosphor layer 21 is firmly fixed to the anode electrode 12 by the binder particles 32 and has high conductivity due to the conductive agent particles 33. There may be a case where it is not necessary to add the conductive agent particles 33 depending on the type of the fluorescent substance, and in this case, only the binder particles 32 are added. The second phosphor layer 22 is formed only of the phosphor particles 31 and does not include the binder particles 32 and the conductive particles 33. Since the second phosphor layer 22 does not include non-luminescent particles such as binder particles 32 and The conductive agent particles 33 are therefore capable of having high brightness.
簡而言之，由於第一螢光物質層21具有黏合和導電的功能，第二螢光物質層22具有光發射的功能，因此螢光物質層2具有高結合強度、高導電性和高亮度。 In short, since the first phosphor layer 21 has a function of bonding and conducting, the second phosphor layer 22 has a function of light emission, and thus the phosphor layer 2 has high bonding strength, high conductivity, and high brightness. .
相比由層厚和組分與第一螢光物質層21相同的單層構成的傳統螢光物質層，螢光物質層2的亮度提高約30%。 The brightness of the phosphor layer 2 is increased by about 30% compared to the conventional phosphor layer composed of a single layer having the same layer thickness and composition as the first phosphor layer 21.
如將在下面描述的，為了形成螢光物質層2，用於形成第一螢光物質層21的糊料首先被塗覆到陽極電極12並且被乾燥。其後，用於形成第二螢光物質層22的糊料被塗覆到第一螢光物質層21。因此，即使在已塗覆的第一螢光物質層21中出現針孔，針孔也會被塗覆的第二螢光物質層22所填充。因此，在整體上能夠降低或避免螢光物質層2出現針孔。 As will be described below, in order to form the phosphor layer 2, the paste for forming the first phosphor layer 21 is first applied to the anode electrode 12 and dried. Thereafter, the paste for forming the second phosphor layer 22 is applied to the first phosphor layer 21. Therefore, even if pinholes appear in the applied first phosphor layer 21, the pinholes are filled with the coated second phosphor layer 22. Therefore, pinholes of the phosphor layer 2 can be reduced or avoided as a whole.
從結合強度來看，螢光物質層2的厚度優選地等於或小於40μm(等於或小於第一螢光物質層21的厚度的2倍)；並且考慮到批量生產，厚度優選地等於或小於35μm(等於或小於第一螢光物質層21的厚度的1.75倍)。第二螢光物質層22的厚度優選地等於或薄於第一螢光物質層21。此外，從發光效率來看，第二螢光物質層22的螢光物質的直徑優選地等於或小於第一螢光物質層21的直徑(平均直徑)。在本實施方式中，第一螢光物質層21使用具有3μm直徑的螢光物質，第二螢光物質層22使用具有2.5μm直徑的螢光物質。 The thickness of the phosphor layer 2 is preferably equal to or less than 40 μm (equal to or less than 2 times the thickness of the first phosphor layer 21) in terms of bonding strength; and the thickness is preferably equal to or less than 35 μm in consideration of mass production. (equal to or less than 1.75 times the thickness of the first phosphor layer 21). The thickness of the second phosphor layer 22 is preferably equal to or thinner than the first phosphor layer 21. Further, the diameter of the fluorescent substance of the second phosphor layer 22 is preferably equal to or smaller than the diameter (average diameter) of the first phosphor layer 21 in terms of luminous efficiency. In the present embodiment, the first phosphor layer 21 uses a phosphor having a diameter of 3 μm, and the second phosphor layer 22 uses a phosphor having a diameter of 2.5 μm.
用於形成第二螢光物質層22的糊料可以通過使得第二螢光物質層22的尺寸(將要塗覆的圖案的面積)等於或小於 第一螢光物質層21的尺寸而容易被塗覆。 The paste for forming the second phosphor layer 22 may be made such that the size of the second phosphor layer 22 (the area of the pattern to be coated) is equal to or smaller than The first phosphor layer 21 is sized to be easily coated.
在將要施加的陽極電壓高、例如高於70V的情況下，傳統上使用被稱為氧化矽包覆的螢光物質來提高螢光物質的耐受電壓，在該螢光物質中氧化矽包覆在螢光物質顆粒上。在本實施方式的螢光物質層2中，通過僅允許第二螢光物質層22使用氧化矽包覆的螢光物質而提高耐受電壓。因此，僅第二螢光物質層22可以使用氧化矽包覆的螢光物質，或者第一和第二螢光物質層21和22均可以使用氧化矽包覆的螢光物質，其中第二螢光物質層22具有比第一螢光物質層21更大量的氧化矽包覆的螢光物質。 In the case where the anode voltage to be applied is high, for example, higher than 70 V, a fluorescent substance called cerium oxide coating is conventionally used to increase the withstand voltage of the fluorescent substance, and cerium oxide is coated in the fluorescent substance. On the phosphor particles. In the phosphor layer 2 of the present embodiment, the withstand voltage is increased by allowing only the phosphor material coated with ruthenium oxide on the second phosphor layer 22. Therefore, only the second phosphor layer 22 may use a ruthenium oxide-coated phosphor, or both the first and second phosphor layers 21 and 22 may use a ruthenium oxide-coated phosphor, wherein the second phosphor The photo-material layer 22 has a larger amount of cerium oxide-coated phosphor material than the first phosphor layer 21.
傳統地，為了防止螢光物質層的發光效率由於在螢光顯示裝置運行期間在螢光物質層中所產生的氣體而下降，螢光物質顆粒由WO3(亮度提升材料)包覆。在本實施方式中，第一和第二螢光物質層21和22均可以施用WO3，或者至少第二螢光物質層22可以施用WO3。在這種情況下，第二螢光物質層22由螢光物質和WO3形成，並且不包括結合劑。 Conventionally, in order to prevent the luminous efficiency of the phosphor layer from being lowered due to the gas generated in the phosphor layer during the operation of the fluorescent display device, the phosphor particles are coated with WO 3 (brightness enhancing material). In the present embodiment, both the first and second phosphor layers 21 and 22 may be applied with WO 3 , or at least the second phosphor layer 22 may be applied with WO 3 . In this case, the second phosphor layer 22 is formed of a fluorescent substance and WO 3 and does not include a binder.
在第一和第二螢光物質層21和22中使用的螢光物質不限於ZnO：Zn，而是可以使用其它的螢光物質。此外，第一和第二螢光物質層21和22可以使用彼此相同類型的螢光物質，或者根據層的不同而使用彼此不同類型的螢光物質。 The fluorescent substance used in the first and second phosphor layers 21 and 22 is not limited to ZnO:Zn, and other fluorescent substances may be used. Further, the first and second phosphor layers 21 and 22 may use the same type of phosphors as each other, or use different types of phosphors from each other depending on the layers.
接下來，形成圖1中所示的螢光物質層2的步驟和用於形成螢光物質層2的糊料將會參照圖2A和2B描述。 Next, the step of forming the phosphor layer 2 shown in Fig. 1 and the paste for forming the phosphor layer 2 will be described with reference to Figs. 2A and 2B.
首先，形成螢光物質層2的步驟將會參照圖2A描述。 First, the step of forming the phosphor layer 2 will be described with reference to FIG. 2A.
在步驟S1中，用於形成第一螢光物質層21的第一糊料以預定的圖案(圖形、7段、字母等)塗覆到陽極電極。在步驟S2中，第一螢光物質層21通過將第一糊狀物的塗覆物在設定為100℃的烤箱中乾燥30分鐘而形成。在步驟S3中，用於形成第二螢光物質層22的第二糊料以預定的圖案塗覆到第一螢光物質層21。在步驟S4中，第二螢光物質層22通過將第二糊料的塗覆物在設定為100℃的烤箱中乾燥30分鐘而形成。在步驟S5中，第一和第二螢光物質層21和22在500℃下被烘烤。 In step S1, the first paste for forming the first phosphor layer 21 is applied to the anode electrode in a predetermined pattern (pattern, 7 segments, letters, etc.). In step S2, the first phosphor layer 21 is formed by drying the coating of the first paste in an oven set to 100 ° C for 30 minutes. In step S3, the second paste for forming the second phosphor layer 22 is applied to the first phosphor layer 21 in a predetermined pattern. In step S4, the second phosphor layer 22 is formed by drying the coating of the second paste in an oven set to 100 ° C for 30 minutes. In step S5, the first and second phosphor layer layers 21 and 22 are baked at 500 °C.
第一和第二糊料的塗覆可以使用網版印刷技術或光刻技術中的任一技術。在網版印刷中，如果在第一糊料乾燥後隨即烘烤第一螢光物質層21，那麼烘烤過的第一螢光物質層21可能在塗覆第二糊料時通過與網版接觸而剝離。然而，在本實施方式中，由於第二糊料在第一糊料乾燥後還未烘烤時塗覆，因此第一螢光物質層21被剝離是幾乎不可能的。 The coating of the first and second pastes may use any of a screen printing technique or a photolithography technique. In screen printing, if the first phosphor layer 21 is baked immediately after the first paste is dried, the baked first phosphor layer 21 may pass through the screen when the second paste is applied. Peel off by contact. However, in the present embodiment, since the second paste is applied when the first paste is not baked after drying, it is almost impossible to peel off the first phosphor layer 21.
接下來，將會參照圖2B描述分別用於形成第一和第二螢光物質層21和22的第一和第二糊料。 Next, the first and second pastes for forming the first and second phosphor layers 21 and 22, respectively, will be described with reference to FIG. 2B.
在本實施方式中使用的第一糊料包括60wt%的螢光物質(ZnO：Zn)，3wt%的導電劑(In2O3)，1wt%的結合劑(超細SiO2顆粒)，和36Wt%的有機溶劑(萜品醇)。在本實施方式中使用的第二糊料包括60wt%的螢光物質(ZnO：Zn)，0wt%的導電劑和結合劑，和40wt%的有機溶劑(萜品醇)。樹脂也可以添加到第一和第二糊料各自。 The first paste used in the present embodiment includes 60 wt% of a fluorescent substance (ZnO: Zn), 3 wt% of a conductive agent (In 2 O 3 ), 1 wt% of a binder (ultrafine SiO 2 particles), and 36 Wt% organic solvent (terpineol). The second paste used in the present embodiment includes 60% by weight of a fluorescent substance (ZnO: Zn), 0% by weight of a conductive agent and a binder, and 40% by weight of an organic solvent (terpineol). A resin may also be added to each of the first and second pastes.
當添加到第一螢光物質層21的導電劑的量從0.5wt%逐漸提高時，螢光物質層2的亮度與添加的導電劑的量的提高成比例地上升，並且在2wt%的添加量處達到頂點。因此，添加到螢光物質層21的導電劑的量不需要限制到3wt%而是可以在0.5wt%至3wt%的範圍中。 When the amount of the conductive agent added to the first phosphor layer 21 is gradually increased from 0.5 wt%, the luminance of the phosphor layer 2 rises in proportion to the increase in the amount of the added conductive agent, and is added at 2 wt%. The amount reaches the apex. Therefore, the amount of the conductive agent added to the phosphor layer 21 need not be limited to 3 wt% but may be in the range of 0.5 wt% to 3 wt%.
如果導電劑的量過小，那麼由於螢光物質層的電阻增加，螢光物質層容易被充能，而如果導電劑的量過大，那麼對發光沒有貢獻的無功電流變大。此外，添加到螢光物質的導電劑的量根據螢光物質自身的電阻(固有電阻)不同而有所不同。例如，當前使用的有色螢光物質大體上具有高固有電阻，從而可以添加大約15wt%的導電劑。 If the amount of the conductive agent is too small, the phosphor layer is easily charged due to an increase in the resistance of the phosphor layer, and if the amount of the conductive agent is too large, the reactive current which does not contribute to the light emission becomes large. Further, the amount of the conductive agent added to the fluorescent substance varies depending on the resistance (inherent resistance) of the fluorescent substance itself. For example, currently used colored fluorescent materials generally have a high inherent resistance so that about 15% by weight of a conductive agent can be added.
作為添加到螢光物質中的導電劑、結合劑和有機溶劑，它們的其它類型可以使用以代替以上所呈現的類型。 As the conductive agent, binder, and organic solvent added to the fluorescent substance, other types thereof may be used instead of the types presented above.
本實施方式描述了包括熱致電子發射燈絲的螢光顯示裝置，但是螢光顯示裝置可以包括場致發射型陰極(FEC)。此外，本實施方式不限於螢光顯示裝置，而是可以使用包括螢光物質層的螢光發光裝置諸如光源。 The present embodiment describes a fluorescent display device including a thermotropic electron emission filament, but the fluorescent display device may include a field emission type cathode (FEC). Further, the present embodiment is not limited to the fluorescent display device, but a fluorescent light emitting device including a fluorescent substance layer such as a light source may be used.
儘管本發明已參照實施方式示出和描述，但是本領域中的技術人員應當瞭解的是，可以做出各種改變和修改而不背離由以下的申請專利範圍所限定的本發明的保護範圍。 While the invention has been shown and described with reference to the embodiments of the present invention, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the invention as defined by the appended claims.
2‧‧‧螢光物質層 2‧‧‧Fluorescent material layer
11‧‧‧基底 11‧‧‧Base
12‧‧‧陽極電極 12‧‧‧Anode electrode
21‧‧‧第一螢光物質層 21‧‧‧First phosphor layer
22‧‧‧第二螢光物質層 22‧‧‧Second phosphor layer
31‧‧‧螢光物質顆粒 31‧‧‧Fluorescent material particles
32‧‧‧結合劑顆粒 32‧‧‧Binder particles
33‧‧‧導電劑顆粒 33‧‧‧Conducting agent particles
F‧‧‧是電子源 F‧‧‧ is an electron source
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