WO2006022150A1 - 蛍光体の製造方法及び蛍光体並びにプラズマデイスプレイパネル - Google Patents
蛍光体の製造方法及び蛍光体並びにプラズマデイスプレイパネル Download PDFInfo
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- WO2006022150A1 WO2006022150A1 PCT/JP2005/014750 JP2005014750W WO2006022150A1 WO 2006022150 A1 WO2006022150 A1 WO 2006022150A1 JP 2005014750 W JP2005014750 W JP 2005014750W WO 2006022150 A1 WO2006022150 A1 WO 2006022150A1
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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
- C09K11/0805—Chalcogenides
- C09K11/0811—Chalcogenides with zinc or cadmium
Definitions
- the present invention relates to a phosphor manufacturing method, a phosphor, and a plasma display panel, and more particularly, a phosphor manufacturing method, a phosphor, and a phosphor that is surface-treated with an acid on a phosphor dispersed in a solvent, and The present invention relates to a plasma display panel.
- LCD Liquid Crystal Display
- EL Electro Luminescence
- the plasma display can be reduced in thickness and weight, the structure can be simplified, and the screen can be enlarged, and the visible range, the so-called viewing angle, is 160 degrees in both the horizontal and vertical directions. Because of the above, it is possible to see clear images with a wide range of vertical and horizontal forces compared to LCD panels. In addition, since it is a video display system with fixed pixels based on a dot matrix, it is possible to display high-quality video even on a large screen by suppressing color shift and screen distortion.
- PDPs used in these plasma displays include a large number of discharge cells formed by two glass substrates provided with electrodes and barrier ribs provided between the substrates. Inside these discharge cells, A phosphor layer coated with a phosphor is formed.
- the PDP configured as described above applies a voltage between the electrodes to selectively discharge the discharge cell, thereby causing vacuum ultraviolet rays (hereinafter referred to as VUV) caused by the discharge gas enclosed in the discharge cell. Vacuum Violet) is generated, and this VUV excites the phosphor to emit visible light.
- VUV vacuum ultraviolet rays
- a predetermined amount of a compound containing an element constituting the phosphor matrix and a compound containing an activator element are mixed and then baked to perform an inter-solid reaction.
- a solid phase method, a phosphor raw material solution containing an element constituting the phosphor matrix, and a phosphor raw material solution containing an activator element are mixed, and the obtained phosphor precursor precipitate is subjected to solid-liquid separation.
- PDPs have been highly miniaturized. PDPs with high miniaturization have a small particle size and high emission intensity. There is a need for phosphors. However, the phosphor particles obtained by the solid phase method have a large particle size, and as the particle size decreases, the luminous efficiency and the luminous intensity decrease, which causes a problem.
- VUV generated by discharge is absorbed by impurities such as unreacted substances and by-products adhering to the surface of the phosphor particles after firing, resulting in a decrease in emission intensity.
- impurities such as unreacted substances and by-products adhering to the surface of the phosphor particles after firing, resulting in a decrease in emission intensity.
- a phosphor capable of improving the luminous efficiency of the phosphor and a method for producing the phosphor after phosphor synthesis by a liquid phase method, nitric acid, hydrochloric acid, or the like is applied to the phosphor surface.
- Method for producing phosphor by removing impurities such as surface layer of damaged phosphor particles and unreacted substances and by-products adhering to the surface of phosphor particles by performing chemical treatment with etching solution has been developed (see, for example, Patent Documents 1, 2, and 3).
- Patent Document 1 Japanese Patent Laid-Open No. 2000-226577
- Patent Document 2 Japanese Patent Laid-Open No. 2001-172622
- Patent Document 3 Japanese Patent Laid-Open No. 2003-292950
- the present invention has been made in view of the above points, and a phosphor manufacturing method, a phosphor, and a plasma capable of suppressing damage to a phosphor body caused by an etching solution
- An object is to provide a display panel.
- the configuration of the present invention has been found to be achieved by adopting one of the following configurations.
- the phosphor manufacturing method according to the invention described in Structure 1 includes performing a pulverization process step of pulverizing the phosphor particles and adding an etching solution.
- the amount of etching solution added is 0.001 to 0.005 mol per lg phosphor. Therefore, by controlling the amount of etching solution added, the solvent in which the phosphor particles are dispersed and the etching solution are added. Can be mixed more uniformly.
- the addition temperature force of the etching solution is 20 to 60 ° C
- the solvent in which the phosphor particles are dispersed and the etching solution are more uniformly mixed by controlling the addition temperature of the etching solution. be able to.
- the etching solution is added to the solvent in which the phosphor particles are dispersed, the solvent in which the phosphor particles are dispersed and the etching solution are made more uniform by changing the addition position of the etching solution. Can be mixed.
- the solvent in which the phosphor particles supplied from the first flow path are dispersed and the etching liquid supplied from the second flow path are simultaneously discharged into the liquid. Since the apparatus is used, the solvent in which the phosphor particles are dispersed and the etching solution can be more uniformly mixed by changing the form of the apparatus to be used.
- the solvent in which the phosphor particles supplied from the first flow path are dispersed and the etching liquid supplied with the second flow path force are continuously collided and mixed with each other.
- the solution after collision and mixing is continuously supplied to the flow channel, and is supplied at a flow rate higher than the flow rate of the solvent in which the phosphor particles are dispersed and the etching solution, and then continuously discharged from the third flow channel. Therefore, it is possible to more uniformly mix the solvent in which the phosphor particles are dispersed with the etching solution by changing the form of the apparatus to be used. it can.
- the surface treatment step is performed after the pulverization step, impurities such as unreacted substances and by-products attached to the surface of the phosphor particles and the surface damaged in the pulverization step.
- the layers can be removed simultaneously.
- FIG. 1 is a schematic view showing a Y-shaped reactor.
- FIG. 2 is a schematic view showing a general reaction apparatus.
- FIG. 3 is a schematic view showing a double jet reactor.
- FIG. 4 is a perspective view showing an example of a plasma display panel according to the present invention.
- FIG. 5 is a perspective view showing the structure of another discharge cell.
- FIG. 6 is a perspective view showing the structure of another discharge cell.
- FIG. 7 is a schematic view showing another usage mode of the reaction apparatus shown in FIG. 2.
- the phosphor according to the present invention is a vacuum ultraviolet-excited phosphor (hereinafter referred to as phosphor) that is particularly susceptible to the influence of the emission intensity due to the composition in the vicinity of the surface layer.
- phosphor vacuum ultraviolet-excited phosphor
- impurities adhering to the surface and the surface layer of the phosphor particles (hereinafter referred to as impurities) are removed, and the VUV is received efficiently, so that the emission intensity is reduced. Improvements are being made.
- the phosphor particles to be etched are manufactured by the liquid-phase method, the average particle size is 20 nm to 5 ⁇ m, and the particle size distribution is within 50% of the average particle size. Is preferred to be.
- the average particle size is an average value obtained by measuring the particle size of 300 phosphor particles using an electron microscope (for example, S-900 manufactured by Hitachi, Ltd.).
- particle diameter as used herein means the length of the phosphor particles when the phosphor particles are cubic or octahedral so-called normal crystals. When it is not a normal crystal, for example, when the phosphor particles are spherical, rod-like or tabular, it means the diameter when considering a sphere equivalent to the volume of the phosphor particles.
- the etching process is performed to remove impurities and the like on the surface of the phosphor particles, and only impurities adhering to the surface may be removed, or the luminous efficiency of the phosphor particle surface is low. You may make it remove a surface layer with an impurity.
- the surface layer having a low luminous efficiency on the surface of the phosphor particles means a range of about 0% to 20% of the surface force diameter, and preferably 1.5 mol% or more and less than 20 mol%.
- a method for producing a phosphor according to the present invention includes a precursor forming step for forming a phosphor precursor, and a firing step for obtaining phosphor particles by firing the precursor obtained in the precursor forming step.
- the phosphor particles obtained in the firing step are subjected to a dispersion treatment to reduce the particle size, and in the dispersion treatment step, the surface of the obtained phosphor particles is subjected to an etching treatment to produce impurities, etc. And a surface treatment process for removing the surface.
- a precursor that is an intermediate product of the phosphor is synthesized by a liquid phase method, and in the subsequent firing step, the precursor is fired at a predetermined temperature, thereby producing phosphor particles. Can be obtained.
- the liquid phase method is a method of synthesizing a precursor in the presence of a liquid or in a liquid, and is also called a liquid phase synthesis method.
- the phosphor raw material is reacted in the liquid phase, so that the reaction between the element ions constituting the phosphor is performed, and it is easy to obtain a stoichiometrically high purity phosphor.
- liquid phase method in the present embodiment, a general crystallization method represented by cooling crystallization or a coprecipitation method is used, but a reaction crystallization method can be particularly preferably used.
- the reaction crystallization method uses a crystallization phenomenon to produce a precursor by mixing a solution or a source gas containing an element as a phosphor raw material in a liquid phase or a gas phase. It is a method of doing.
- the crystallization phenomenon cooled, evaporated, P H regulation, the liquid phase when such physical youth properly by concentration, etc. resulting in a change in the state of the mixed system change in chemical environment, or by a chemical reaction
- it refers to a production method based on physical and chemical operations resulting from the occurrence of such a crystallization phenomenon.
- any solution can be applied as long as the reaction raw material is dissolved, but water is preferable from the viewpoint of easy control over the degree of supersaturation.
- the order of adding the raw materials can be appropriately selected depending on the activity, which may be simultaneous or different.
- a so-called Y-shaped reactor 1 is used in which the shape of the plurality of flow paths provided is Y-shaped in plan view. It is done.
- the Y-shaped reactor 1 includes a first tank 3 in which one phosphor raw material solution A is stored, And the second tank 4 in which the other phosphor raw material solution B is stored.
- the first tank 3 and the second tank 4 have one end of the first flow path 5 and the second flow path 6 respectively. Each is connected.
- Pumps PI and P2 for supplying the respective phosphor raw material solutions A and B are provided in the middle of the first flow path 5 and the second flow path 6, respectively.
- the other ends of the flow paths 5 and 6 are connected to the third flow path 7 via the connection portion C, and are continuously supplied via the flow paths 5 and 6 at the connection portion C.
- the phosphor raw material solutions A and B are collided and mixed.
- the third flow path 7 is configured to continuously supply the mixed solution after mixing to the maturation container 2 installed below the discharge port of the third flow path 7.
- the flow rate of the mixed solution is larger than the flow rate of each solution supplied by the channel 5 and the second channel 6.
- the aging container 2 is provided with a stirring blade 8 for stirring the mixed solution stored therein, and the stirring blade 8 is connected to a driving device 9 which is a rotational power source.
- the manufacturing apparatus used is not limited to the Y-shaped reactor 1, but is a so-called T-shaped manufacturing apparatus that differs only in the form of the flow path and has a T-shape in plan view. Also good.
- the first, second, and third flow paths 5, 6, and 7 are formed in a cylindrical shape, and the diameter of each flow path 5, 6, and 7 is formed to be approximately lmm.
- the diameter and length of the third flow path 7 are not limited to the present embodiment, and the particle force that is immediately formed by the collision mixing at the connection C is the time until the particle force becomes almost stable. Any diameter and length can be used as long as they can satisfy the so-called stabilization time.
- the stabilization time in this embodiment is set to 0.001 seconds or more.
- the time for staying while moving inside the Y-shaped reactor 1 is preferably 0.001 seconds or more, more preferably 0.01 seconds or more, more than 0.1 seconds. Is particularly preferred
- any pump can be used as the pump PI, P2 as long as it is a conventionally known pump, but a non-pulsating pump is preferable.
- connection portion C is not provided with a dynamic stirring mechanism, but is not limited to this embodiment, and may be provided with a dynamic stirring mechanism such as a stirring blade depending on the purpose. .
- the aging container 2 is installed below the discharge port of the third flow path 7 in the Y-shaped reactor 1 described above.
- the mixed solution stored inside is agitated.
- the agitating blade 8 is provided, and this agitating blade 8 is connected to a driving device 9 which is a rotational power source.
- ultrasonic waves may be irradiated during the reaction in which it is more preferable to adjust various physical properties such as temperature during the reaction, addition rate, stirring rate, and pH.
- a surfactant or a polymer may be added to control the particle size.
- the solution may be concentrated and matured, or concentrated or matured! /, Or only one of them.
- the protective colloid functions to prevent aggregation of the finely divided precursor particles.
- polymer compounds can be used regardless of natural or artificial, and among them, proteins can be preferably used.
- Examples of the protein include gelatin, water-soluble protein, and water-soluble glycoprotein. Specific examples include albumin, ovalbumin, casein, soy protein, synthetic protein, and protein synthesized by genetic engineering.
- gelatin examples include lime-processed gelatin and acid-processed gelatin, and these may be used in combination.
- hydrolysates of these gelatins and enzymatic degradations of these gelatins may also be used.
- the protective colloid does not need to have a single composition, and various binders may be mixed. Specifically, for example, a graft polymer of the above-described gelatin and another polymer can be used.
- the average molecular weight of the protective colloid is preferably 10,000 or more force S, more preferably 10,000 to 300,000 force, and particularly preferably 10,000 to 30,000.
- the protective colloid can be added to one or more of the raw material solutions. Depending on the amount of the protective colloid that may be added to all of the raw material solutions and the addition rate of the reaction liquid, The diameter can be controlled.
- various properties of the phosphor such as the particle size, particle size distribution, and emission characteristics of the phosphor particles after firing are as follows: Since it largely depends on the properties of the precursor, it is preferable to make the precursor sufficiently small by controlling the particle size of the precursor in the precursor formation step. In addition, since the precursors are easily aggregated when the precursors are made into fine particles, it is extremely effective to synthesize the precursors while preventing aggregation of the precursors by adding protective colloids. Therefore, particle size control becomes easy. When the reaction is carried out in the presence of a protective colloid, it is necessary to give sufficient consideration to the control of the particle size distribution of the precursor and the exclusion of impurities such as secondary salts.
- the particle size is appropriately controlled and the precursor is synthesized, and then the precursor is prepared by a method such as filtration, evaporation to dryness, and centrifugation as necessary.
- the body may be collected, and then a washing and desalting treatment step may be performed.
- the desalting treatment step is a step for removing impurities such as by-salts from the precursor.
- impurities such as by-salts from the precursor.
- Various membrane separation methods, coagulation sedimentation methods, electrodialysis methods, methods using ion-exchange resin, Nudelle washing method Etc. can be applied.
- the electric conductivity after body desalting is preferably in the range of 0.01 to 20 mSZcm, more preferably in the range of 0.01 to 10 mSZcm, and particularly preferably in the range of 0.01 to 5 mSZcm.
- the emission intensity of the finally obtained phosphor can be improved.
- a method for measuring electrical conductivity a conventionally known method can be applied, and for example, a commercially available electrical conductivity measuring device can be used.
- a drying step may be further performed. Any method such as vacuum drying, air flow drying, fluidized bed drying, spray drying, etc., which is preferably performed after washing or desalting can be applied to the drying step.
- the drying temperature is not particularly limited, but if the drying temperature is preferably higher than or equal to the temperature at which the solvent used is vaporized, the baking is performed simultaneously with the drying, and the subsequent baking treatment is performed. Since a phosphor can be obtained without being performed, it is more preferably in the range of 50 to 300 ° C.
- the rare earth borate phosphor, the silicate phosphor, the aluminate phosphor, etc. Is obtained by baking.
- conditions for the firing treatment will be described.
- a conventionally known method can be applied to the firing treatment, and the firing temperature and time may be adjusted as appropriate.
- a desired phosphor can be obtained by filling the precursor in an alumina boat and firing it at a predetermined temperature in a predetermined gas atmosphere.
- gas atmosphere depending on the composition of the precursor, in a reducing atmosphere, in an oxidizing atmosphere, in the presence of sulfides
- Conditional force such as inert gas can be selected as appropriate.
- firing may be performed at 600 ° C to 1800 ° C for an appropriate time in the air.
- Another effective method is firing at about 800 ° C, oxidizing the organic matter, and firing at 1100 ° C for 90 minutes in air.
- a conventionally known apparatus can be applied to the baking apparatus or the baking container, such as a box furnace or a crucible furnace.
- An apparatus such as a cylindrical tube type, a boat type, or a rotary kiln is preferably used.
- a sintering inhibitor may be added as necessary.
- it may be fired by mixing a powdered sintering inhibitor with the dried precursor, which may be added as a slurry during the formation of the precursor.
- the sintering inhibitor is not particularly limited, and is appropriately selected depending on the type of phosphor and firing conditions. For example, depending on the firing temperature range of the phosphor, TiO
- Metal oxides such as 2 have a SiO force for firing below 1000 ° C and an AI O force for firing below 1700 ° C.
- reduction treatment or oxidation treatment may be performed as necessary.
- a classification process may be performed in which a cooling process, a surface process, or the like may be performed.
- the cooling process is a process of cooling the fired product obtained in the firing step, and it is possible to cool the fired product while filling the fired device.
- the cooling treatment is not particularly limited, and can be appropriately selected from conventionally known cooling methods such as a method of lowering the temperature by leaving alone or a method of forcibly lowering the temperature while controlling the temperature using a cooler. It is.
- the surface treatment is a treatment for adsorbing or coating the surface of the fired product obtained in the firing step, and the point at which the surface treatment is performed depends on the purpose and should be selected as appropriate. Is possible. For example, when the surface of the phosphor is coated with an oxide containing at least one element selected from Si, Ti, Al, Zr, Zn, In, Sn force at any point before the subsequent dispersion treatment step, A decrease in the crystallinity of the phosphor during the dispersion treatment can be suppressed, and a decrease in the emission intensity can be suppressed by preventing the excitation energy from being captured by the surface defects of the phosphor.
- the surface of the phosphor is coated with an organic polymer compound or the like at any point after the dispersion treatment step, properties such as weather resistance can be improved, and a phosphor excellent in durability can be obtained.
- the thickness and coverage of the coating layer when these surface treatments are performed can be arbitrarily controlled as appropriate.
- a high-speed agitation type impeller type disperser for example, a colloid mill, a roller mill, or a ball mill, a vibrating ball mill, an attritor mill, a planetary ball mill, a sand mill, and the like are moved in the apparatus.
- a device that generates fine particles by both the collision and the shearing force or a dry disperser such as a cutter mill, a hammer mill, and a jet mill, an ultrasonic disperser, and a high-pressure homogenizer.
- a wet media type disperser that uses a medium as a medium, and a continuous wet media type disperser capable of continuous dispersion treatment is used. Is more preferable.
- a mode in which a plurality of continuous and wet media type dispersers are connected in series is also applicable.
- continuous dispersion processing means that at least the phosphor and the dispersion medium are dispersed and supplied to the disperser without interruption at a constant quantity ratio per time, and at the same time in the disperser This refers to the form in which the produced dispersion is discharged from the disperser without being interrupted.
- the dispersion chamber container so-called vessel, can be appropriately selected as a vertical type or a horizontal type. It is.
- the phosphor particles obtained in the firing step described above have a uniform composition and a small remaining amount of unreacted substances by forming a precursor by a liquid phase method in the precursor forming step. It can be.
- fine particle phosphors having an average particle size of 20 nm or more and 5 m or less can be obtained within ⁇ 5% of the average particle size.
- Phosphor particles having a particle size distribution of 0% or less can be obtained.
- the content (% by weight) of the phosphor particles in the phosphor dispersion solution is 5 to 30%, preferably 10 to 20%.
- the phosphor particles are fine and have a narrow particle size distribution
- the phosphor layers provided in the PDP can be densely packed with the phosphor particles, and the emission intensity of the PDP can be improved. Can be achieved.
- the uniform particle size enables excellent light emission without unevenness.
- the phosphor particles are produced using a liquid phase method from the viewpoint of obtaining phosphor particles that are fine particles and have a narrow particle size distribution.
- the method for producing the phosphor is not limited to this, and is a method in which a phosphor having an average particle size of phosphor particles of 20 nm or more and 2 m or less or a particle size distribution of phosphor particles within 50% of the average particle size is obtained. If there is, the solid phase method may be used without being limited to the liquid phase method which may be produced using a conventionally known method.
- the surface treatment can be appropriately selected according to the force of the etching treatment, impurities on the surface of the phosphor particles, and the like.
- a physical method of scraping the surface with fine particles or ion sputtering may be used, but a chemical method such as immersing phosphor particles in an etching solution to dissolve impurities on the surface is effective. It is. At this time, if the etching solution erodes the phosphor particle main body, the emission intensity becomes low, so the etching must be performed carefully.
- the reactor 11 shown in FIG. 2 is used, and the etching solution stored in the tank 12 is dispersed in the phosphor 14 stored in the container 14 via the flow path 13 by the pump P3. It is added to the solution. Further, similarly to the Y-shaped reactor 1 described above, a stirring blade 16 connected to the driving device 15 is provided to stir the mixed solution.
- the reaction apparatus used is not limited to the reaction apparatus 11 shown in FIG. 2, but may be the Y-shaped reaction apparatus 1 described above, or as shown in FIG.
- a double jet reactor 21 using a double jet method in which different types of reaction solutions are simultaneously added by separate nozzles may be used.
- the double jet reactor 21 is provided with a first tank 22 and a second tank 23.
- the first tank 22 and the second tank 23 have a first flow path 24 and a second flow path.
- One end of each path 25 is connected.
- Pumps P4 and P5 are provided in the middle of the first flow path 24 and the second flow path 25, respectively.
- a reaction vessel 26 is provided below the other ends of the first channel 24 and the second channel 25 so that the solutions stored in the first tank 22 and the second tank 23 are supplied. It has become.
- the reaction vessel 26 is provided with a stirring blade 28 connected to a driving device 27 so as to stir the mixed solution.
- the phosphor according to the present invention does not have the role of improving the light emission intensity due to the convex portion on the surface unlike the electroluminescent phosphor, so that the phosphor particles are closely packed in the phosphor layer.
- the surface of the phosphor particles and the surface of the phosphor particles should be uniformly etched! From the viewpoint of etching, the phosphor particles having few or no projections are etched. ⁇ is preferred.
- the stirring time is preferably 5 minutes or more and less than 2 hours after completion of the acid addition, and more preferably 20 minutes or more and less than 1 hour. This is because the emission intensity decreases if the value falls outside this range.
- the amount of the etching solution added is preferably about 0.002 to 0.002 mol, preferably 0.001 to 0.005 mol per lg of phosphor.
- the rate of addition of the etching solution 1. specific surface lm 2 per phosphor 2 X 10- 16 ⁇ 7. 0 X 10- 15 is preferably a molZmin tool 2. 0 X 10- 16 More preferably, it is ⁇ 5.0 X 10—15 molZmin.
- the temperature of the etching solution is preferably 20 to 60 ° C, more preferably 30 to 50 ° C.
- the type of the etching solution is determined according to impurities and the like, and may be an aqueous solution or an organic solvent, which may be acidic or alkaline.
- an acidic aqueous solution is used, the effect appears remarkably, so that a strong acid is particularly preferably used.
- hydrochloric acid As the strong acid, hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, perchloric acid, and the like can be applied, but hydrochloric acid with hydrochloric acid, nitric acid, and sulfuric acid being particularly preferred.
- concentration of strong acid increases, the concentration of the eluted substance increases, and the substance removed during the etching process may be re-adsorbed on the particle surface, and the surface layer of the phosphor particles to be removed Since the amount increases, the industrial efficiency decreases. In addition, concentration localization is likely to occur during etching, making it difficult to uniformly perform etching between particles, and the effect on the emission intensity is reduced.
- the concentration of strong acid is most preferred according to the situation V, and it is desirable to adjust the value.
- the concentration of the etching solution is preferably 0.001 N or more and less than 6N, more preferably 0.001 N or more and less than 2.5N. It is particularly preferable that it is 0.001N or more and less than 0.25N.
- the desired effect can be obtained by etching using a strong acid of 0.001N or more and less than 6N. Especially when a strong acid of 0.001N or more and less than 0.25N is used, only impurities can be efficiently dissolved. This makes it difficult to re-adsorb the substance removed on the particle surface where the concentration of the eluted substance is low. Further, during etching, the concentration of strong acid can be suppressed, and the particle surface can be uniformly etched.
- Zn SiO is dissolved in hydrochloric acid, and the surface layer of the phosphor particles is removed.
- the amount of dissolved ZnSiO that is, the amount removed by the etching process, is controlled by changing the amount of strong acid reacted per unit mole of the phosphor.
- the amount of the phosphor particles to be dissolved and removed by the etching treatment is preferably 1.5 mol% or more and less than 20 mol% of the phosphor particles. After etching, It is preferable to remove the etching solution by washing with water.
- the production method of the phosphor according to the present invention has a specific surface area lm 2 per addition rate force phosphor particles of the etching solution in the surface treatment step 1.
- 2 X 10- 16 ⁇ 7. 0 X 10- Since it is 15 mol Zmin, it is possible to uniformly mix the solvent in which the phosphor particles are dispersed with the etching solution by controlling the addition rate of the etching solution, which enables uniform surface treatment. It can be performed.
- the phosphor manufactured by the method for manufacturing a phosphor according to the present invention is subjected to uniform surface treatment !, thus preventing the phosphor body from being damaged due to the etching solution. This makes it possible to improve the emission intensity of the phosphor.
- PDPs are broadly classified into a DC type that applies a DC voltage and an AC type that applies an AC voltage, depending on the electrode structure and operation mode. Details will be described below with reference to the AC type PDP as shown.
- the PDP 101 in the present embodiment is substantially the same shape as the front plate 102 and the front plate 102 molded in a flat plate shape, and is located at a position facing one surface of the front plate 102.
- the rear plate 103 is arranged.
- the front plate 102 transmits visible light emitted from the discharge cells and displays various information on the substrate, and functions as a display screen of the PDP 101.
- the front plate 102 is preferably made of a material that transmits visible light, such as soda lime glass, so-called blue plate glass, and the thickness dimension is preferably in the range of 1 to 8 mm, 2 mm. Is more preferable.
- a plurality of display electrodes 104 are arranged at regular intervals on the surface of the front plate 102 facing the back plate 103.
- These display electrodes 104 include a transparent electrode 105 formed in a wide band shape and a bus electrode 106 formed in the same shape as the transparent electrode 105, and the bus electrode 106 is laminated on the upper surface of the transparent electrode 105. It has a structure.
- the display electrode 104 is orthogonal to the partition 112 in a plan view, and is a set of two arranged in a positional relationship facing each other with a predetermined discharge gap.
- the transparent electrode 105 a transparent electrode such as a nesa film is applicable, and its sheet resistance is 100 ⁇ or less is preferable.
- the width dimension of the transparent electrode 5 is preferably in the range of 10 to 200 / ⁇ ⁇ .
- the bus electrode 106 is for lowering the resistance, and is formed by sputtering of CrZCuZCr or the like. Further, the width dimension of the bus electrode 106 is smaller than that of the transparent electrode 105 and is preferably in the range of 5 to 50 m.
- the display electrode 104 disposed on the front plate 102 is entirely covered with a dielectric layer 107.
- the dielectric layer 7 can be formed of a dielectric material such as low melting point glass, and the thickness dimension is preferably in the range of 20 to 30 ⁇ m.
- the entire upper surface of the dielectric layer 107 is covered with the protective layer 108.
- an MgO film can be applied, and the thickness dimension is preferably in the range of 0.5 to 50 / ⁇ ⁇ .
- the front plate 102 soda lime glass, so-called blue plate glass, or the like can be applied to the rear plate 103 disposed at a position facing one surface of the front plate 102.
- the range of l to 8 mm is preferable, and about 2 mm is more preferable.
- a plurality of address electrodes 109 are disposed on the surface of the back plate 103 facing the front plate 102. These address electrodes 109 are formed in the same shape as the transparent electrode 105 and the bus electrode 106, and are provided at regular intervals so as to be orthogonal to the display electrode 104 in plan view.
- the address electrode 109 may be a metal electrode such as an Ag thick film electrode, and the width dimension is preferably in the range of 100 to 200 m.
- the entire surface of the address electrode 109 is covered with a dielectric layer 110, and this dielectric layer 110 can also form a dielectric material force such as low melting point glass, and its thickness.
- the length is preferably in the range of 20-30 m.
- a partition wall 111 having a shape protruding in the vertical direction with respect to the back plate 3 is disposed.
- These partition walls 111 are formed in a long shape, and are arranged on both sides of the address electrode 109 so that the longitudinal directions of the adjacent partition walls 111 are parallel to each other.
- a plurality of micro discharge spaces (hereinafter referred to as discharge cells 112) partitioned into a predetermined shape by the barrier ribs 111 are formed in stripes in plan view.
- the partition wall 111 can be formed of a dielectric material force such as low melting point glass, and has a width dimension.
- the method is preferably in the range of 10 to 500 m, more preferably about 100 m.
- the height of the partition wall 111 is usually in the range of 10 to: LOO m, and preferably about 50 m.
- the barrier ribs 111 are arranged in parallel at predetermined intervals, that is, in a stripe shape. , Called the stripe type.
- a grid type discharge in which the barrier ribs 113 are provided in a grid shape in a plan view. It may be a cell 114! /, Or it may be a two-cam-like (octagonal) discharge cell 116 by a pair of bent partition walls 115 as shown in FIG.
- Each discharge cell 112R, 112G, 112B has a phosphor layer 117R configured with a phosphor power that emits light in any of red (R), green (G), and blue (B) manufactured in this example. , 117G, 1 17B are provided in a certain order. Further, a discharge gas is sealed in the hollow interior of each of the discharge cells 112R, 112G, and 112B, and at least one point where the display electrode 104 and the address electrode 109 intersect in a plan view is provided. . Further, the thickness dimension of each phosphor layer 117R, 117G, 117B is not particularly limited, and is preferably in the range of 5-50111.
- Each phosphor layer 117R, 117G, 117B is formed on the side surface or bottom surface of the partition wall.
- a phosphor paste is first prepared by dispersing the above-described phosphor in a mixture of a binder, a solvent, a dispersant, and the like. These phosphor pastes are adjusted to an appropriate viscosity, applied or filled into the corresponding discharge cells 112R, 112G, and 112B, and finally dried or fired.
- the phosphor paste can be adjusted by a conventionally known method. Further, as a method for applying or filling the phosphor paste to the discharge cells 112R, 112G, and 112B, various methods such as a screen printing method, a photoresist film method, and an ink jet method can be applied.
- the PDP 101 having the above-described constituent power selectively causes trigger discharge between the address electrode 109 and one of the pair of display electrodes 104, 104 at the time of display.
- a discharge cell for display is selected.
- the selected discharge Sustain discharge is performed between the pair of display electrodes 104 and 104 inside the cell to generate ultraviolet rays due to the discharge gas, and to generate phosphor layers 117R, 117G, and 117B force visible light.
- the phosphor obtained by the manufacturing method according to the present invention is obtained by using each discharge senor 112R, 112G, 112B (3 ⁇ 43 ⁇ 4 #: ji l7R, 117G, 117B As a result, the emission intensity of the discharge cells 112R, 112G, and 112B can be improved, whereby the emission intensity of the PDP 1 can be improved.
- phosphor 1 was synthesized as a green phosphor using Zn SiO: Mn 2+ as a raw material.
- the phosphor 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 after the surface treatment is obtained.
- the phosphors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 were evaluated on the basis of the intensity of the light emitted before and after the VUV irradiation. .
- Colloidal silica containing 45 g of diacid silicate (Fusuwai Gakugaku Kogyo Co., Ltd .: PL-3), 219 g of 28% ammonia water, and pure water were mixed together, and the liquid volume was reduced.
- a liquid adjusted to 1500 cc was designated as Liquid A.
- the obtained precursor was treated at a temperature of 1200 ° C in an atmosphere of 100% nitrogen.
- Phosphor 1 was obtained by firing for a period of time.
- the phosphor 1 described above is crushed and dispersed by a pot mill to further remove fine particles and giant particles, and further by a sieve. Classification processing was performed.
- the classified phosphor dispersion solution and 2N hydrochloric acid are respectively stored in the reaction vessel 14 and tank 12 of the reactor 11 shown in Fig. 2 and kept at a temperature of 40 ° C, and the pump P3 ⁇ ⁇ ⁇ From this, 2N hydrochloric acid was added to the phosphor dispersion liquid. At this time, the addition rate of the hydrochloric acid, the specific surface area lm 2 per 1. 2 X 10- 16 molZmin phosphor, also the ⁇ Ka ⁇ hydrochloric acid, and adjusted to the phosphor per 0. OOlmol.
- the obtained mixed solution was stirred for 20 minutes, washed with pure water, and then dried at a temperature of 100 ° C for 12 hours to obtain phosphor 2.
- the obtained phosphors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 were placed in a 0.1 to 1.5 Pa vacuum chamber. It was introduced inside and irradiated with VUV using an excimer 146nm lamp (manufactured by Usio). The peak intensity of green light obtained by irradiation is measured using a detector (manufactured by Otsuka Electronics Co., Ltd .: MCPD 3000) and is a relative value when the emission intensity before surface treatment is taken as 100. The relative luminescence intensity was calculated. Here, the relative light emission intensity calculated at this time was set as “relative light emission intensity before discharge” and shown in Table 1.
- each phosphor 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 was covered with a 0.5 mm-thick MgF plate to form neon.
- a release gas filled with 5% xenon gas was used.
- the above-mentioned relative light emission intensity after discharge was divided by the relative light emission intensity before discharge, and the value converted into percentage was set as the maintenance ratio (%) and shown in Table 1.
- the maintenance rate of phosphor 1 that has not been surface-treated with hydrochloric acid is as follows: phosphor 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, Compared with the maintenance rate of 13, it was found that the level was lower regardless of the amount and rate of addition of hydrochloric acid.
- the phosphor 2 that is adjusted in the range of addition rate force 1. 2 X 10- 16 ⁇ 7. 0 X 10- 15 molZmin hydrochloride, 4, 5, 6, 8, 10, 12 'retention ⁇ Also, when compared to the range outside the 1. Omicron chi 10- 16 Moshiku ⁇ or 7.
- the hydrochloric acid temperature during the surface treatment was changed to 15 ° C, 25 ° C, 40 ° C, 55 ° C, 65 ° C, and the other conditions were the same as the phosphor 6 in Example 1.
- Surface treatment was performed to obtain luminous bodies 21, 22, 23, 24, 25.
- the obtained luminous body 21, 22, 23, 24, 25 [Troubleshooting] By the same method as in Example 1, the relative light emission intensity before and after the VUV irradiation was calculated and shown in Table 2 together with the retention rate.
- Pure water was stored in the reaction vessel 26 of the double jet reactor 21 shown in FIG. 3 and kept at a temperature of 40 ° C. Further, the phosphor dispersion liquid after classification in Example 1 and 2N hydrochloric acid were stored in the first tank 22 and the second tank 23, respectively, and kept at a temperature of 40 ° C. Then, the classified phosphor dispersion and 2N hydrochloric acid were simultaneously supplied to the pure water stored in the reaction vessel 26 by the pumps P4 and P5. At this time, the addition rate of hydrochloric acid should be 5.0 X 10-15 mol / min per lm 2 of the specific surface area of the phosphor, and 0.002 mol per lg of phosphor added. It was adjusted.
- the obtained mixed solution was stirred for 20 minutes, then washed with pure water, and further dried at a temperature of 100 ° C for 12 hours to obtain phosphor 41.
- the maintenance rate of phosphor 4 in Example 1 manufactured using reactor 11 was 95%, while that of phosphor 41 manufactured using double jet reactor 21 was 95%.
- the percentage was 96%, and it was found that the phosphor 41 produced using the double jet reactor 21 suppressed the decrease in emission intensity after discharge.
- the phosphor dispersion liquid and 2N hydrochloric acid were respectively stored in tank 3 and tank 4 of Y-shaped reactor 1 shown in FIG. 1 and kept at a temperature of 40 ° C. Then, the phosphor dispersion liquid and 2N hydrochloric acid were simultaneously supplied to the aging container 2 by the pumps PI and P2. At this time, the addition rate of hydrochloric acid was adjusted so that the specific surface area of the phosphor lm 2 was 5.0 X 10-15 molZmin, and the addition amount of hydrochloric acid was 0.002 mol per lg of phosphor. .
- the obtained mixed solution was stirred for 20 minutes, then washed with pure water, and further dried at a temperature of 100 ° C for 12 hours to obtain phosphor 51.
- the relative emission intensity before and after VUV irradiation was calculated in the same manner as in Example 1, and the results are shown in Table 5 together with the maintenance ratio.
- the relative emission intensity and maintenance rate of phosphor 4 in Example 1 with the same addition rate and addition amount of hydrochloric acid but different only in the form of the apparatus used are also shown in Table 4. It was.
- the maintenance rate of phosphor 4 in Example 1 manufactured using reactor 11 was 95%, whereas the maintenance rate of phosphor 51 manufactured using Y-shaped reactor 1 was 98%.
- the phosphor 51 produced using the Y-shaped reactor 1 has the emission intensity after discharge. It has been found that the decrease in is suppressed.
- the pulverization treatment step of pulverizing the phosphor particles, and the addition of the etching solution, the solvent is added to the solvent.
- a phosphor manufacturing method comprising a pulverization process and a surface treatment process for performing a surface treatment on the dispersed phosphor particles! ⁇ Te, specific surface area lm 2 per addition rate force phosphor particles etchant 1. 2 X 10- 16 ⁇ 7.
- the surface treatment can be performed in a uniform manner, whereby uniform surface treatment is performed, and damage to the phosphor body caused by the etching solution is suppressed, and the emission intensity of the phosphor and the plasma display panel is improved. Can be achieved.
- a pulverization treatment step for pulverizing the phosphor particles, and a surface treatment is performed on the phosphor particles dispersed in the solvent by adding an etching solution.
- a method for manufacturing a phosphor comprising a surface treatment process! ⁇ Te, specific surface area lm 2 per addition speed force phosphor particles etchant 1.
- OX 10- 15 molZmin der Runode by controlling the addition rate of the etchant, It becomes possible to uniformly mix the solvent in which the phosphor particles are dispersed and the etching solution, and thereby uniform surface treatment can be performed.
- phosphor particles can be controlled by controlling the amount of added force of the etching solution. It becomes possible to mix the dispersed solvent and the etching solution more uniformly, thereby obtaining a more preferable effect.
- the etching temperature of the etching solution is controlled to control the etching with the solvent in which the phosphor particles are dispersed. It becomes possible to mix the liquid more uniformly, and thereby a more preferable effect can be obtained.
- the etching solution is added to the solvent in which the phosphor particles are dispersed, the phosphor particles are dispersed by changing the addition position of the etching solution. It is possible to more uniformly mix the solvent and the etching solution, thereby obtaining a more preferable effect.
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
Description
Claims
Priority Applications (2)
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JP2006531730A JPWO2006022150A1 (ja) | 2004-08-24 | 2005-08-11 | 蛍光体の製造方法及び蛍光体並びにプラズマデイスプレイパネル |
EP05770455A EP1790708A1 (en) | 2004-08-24 | 2005-08-11 | Fluorescent material manufacturing method, fluorescent material and plasma display panel |
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JP2004243831 | 2004-08-24 | ||
JP2004-243831 | 2004-08-24 |
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US (1) | US7399430B2 (ja) |
EP (1) | EP1790708A1 (ja) |
JP (1) | JPWO2006022150A1 (ja) |
CN (1) | CN101010411A (ja) |
WO (1) | WO2006022150A1 (ja) |
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WO2007040063A1 (ja) * | 2005-10-06 | 2007-04-12 | Konica Minolta Medical & Graphic, Inc. | ナノサイズ蛍光体 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS58123693A (ja) * | 1982-01-20 | 1983-07-22 | 日本電信電話株式会社 | 分散形el「けい」光体の作製方法 |
JPH05255665A (ja) * | 1992-03-13 | 1993-10-05 | Nec Kansai Ltd | 蛍光体の製造方法 |
JPH1012165A (ja) * | 1996-06-26 | 1998-01-16 | Nec Corp | 低速電子線励起蛍光表示装置およびその製造方法 |
JP2000226577A (ja) * | 1999-02-08 | 2000-08-15 | Kasei Optonix Co Ltd | 蛍光体 |
JP2001172622A (ja) * | 1999-11-04 | 2001-06-26 | Samsung Sdi Co Ltd | プラズマディスプレイパネル用緑色発光蛍光体及びその製造方法 |
JP2003292950A (ja) * | 2002-04-04 | 2003-10-15 | Matsushita Electric Ind Co Ltd | 蛍光体とその製造方法 |
JP2005060562A (ja) * | 2003-08-14 | 2005-03-10 | Konica Minolta Holdings Inc | 真空紫外線励起蛍光体の製造方法、真空紫外線励起蛍光体およびプラズマディスプレイパネル |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2164533A (en) * | 1936-08-29 | 1939-07-04 | Rca Corp | Luminescent materials |
US3597366A (en) * | 1968-12-30 | 1971-08-03 | Westinghouse Electric Corp | Halophosphate phosphor process |
-
2005
- 2005-08-11 JP JP2006531730A patent/JPWO2006022150A1/ja active Pending
- 2005-08-11 WO PCT/JP2005/014750 patent/WO2006022150A1/ja not_active Application Discontinuation
- 2005-08-11 CN CNA2005800278904A patent/CN101010411A/zh active Pending
- 2005-08-11 EP EP05770455A patent/EP1790708A1/en not_active Withdrawn
- 2005-08-18 US US11/206,145 patent/US7399430B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58123693A (ja) * | 1982-01-20 | 1983-07-22 | 日本電信電話株式会社 | 分散形el「けい」光体の作製方法 |
JPH05255665A (ja) * | 1992-03-13 | 1993-10-05 | Nec Kansai Ltd | 蛍光体の製造方法 |
JPH1012165A (ja) * | 1996-06-26 | 1998-01-16 | Nec Corp | 低速電子線励起蛍光表示装置およびその製造方法 |
JP2000226577A (ja) * | 1999-02-08 | 2000-08-15 | Kasei Optonix Co Ltd | 蛍光体 |
JP2001172622A (ja) * | 1999-11-04 | 2001-06-26 | Samsung Sdi Co Ltd | プラズマディスプレイパネル用緑色発光蛍光体及びその製造方法 |
JP2003292950A (ja) * | 2002-04-04 | 2003-10-15 | Matsushita Electric Ind Co Ltd | 蛍光体とその製造方法 |
JP2005060562A (ja) * | 2003-08-14 | 2005-03-10 | Konica Minolta Holdings Inc | 真空紫外線励起蛍光体の製造方法、真空紫外線励起蛍光体およびプラズマディスプレイパネル |
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CN101010411A (zh) | 2007-08-01 |
JPWO2006022150A1 (ja) | 2008-05-08 |
US7399430B2 (en) | 2008-07-15 |
EP1790708A1 (en) | 2007-05-30 |
US20060043338A1 (en) | 2006-03-02 |
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