JP2009270081A - Vacuum ultraviolet excitation phosphor and vacuum ultraviolet ray excitation light emitter using the same - Google Patents

Abstract

An object of the present invention is to provide a vacuum ultraviolet-excited phosphor having good emission luminance, paste baking luminance maintenance rate and luminance maintenance rate by gas discharge, and a vacuum ultraviolet excitation light-emitting device using the same.
The surface of an alkaline earth aluminate phosphor activated by at least one of Eu and Mn is selected from the group consisting of Eu, La, Y, Sc, Tb and In. A vacuum ultraviolet-excited phosphor coated with a surface treatment substance containing a phosphate of at least one metal element, wherein the phosphate contains 2 mol or more of P element per 1 mol of metal element The vacuum ultraviolet-excited phosphor characterized in that it has good emission luminance, paste baking luminance maintenance rate and luminance maintenance rate by gas discharge, and by using this phosphor, it has excellent emission characteristics and lifetime characteristics. In addition, a vacuum ultraviolet excitation light emitting device can be provided.
[Selection] Figure 4

Description

  The present invention relates to a vacuum ultraviolet-excited phosphor and a vacuum ultraviolet-excited light emitting device using the same, and in particular, a vacuum ultraviolet-excited phosphor having good light emission luminance, paste baking luminance maintenance rate, and luminance maintenance rate by gas discharge, and the same. The present invention relates to the vacuum ultraviolet light-emitting device used.

  Vacuum ultraviolet excitation phosphors such as alkaline earth aluminate phosphors are used in light emitting devices (vacuum ultraviolet excitation light emitting devices) such as plasma display (hereinafter referred to as PDP) display devices. As shown in FIG. 1 and FIG. 2, the PDP is formed by dividing a sealed gas space sandwiched between two glass plates by partition walls and arranging minute discharge spaces called display cells (discharge cells) in a matrix. Each display cell is coated with a phosphor that emits red, blue, and green light, and is excited by vacuum ultraviolet rays generated by discharge to emit light.

Compared with various flat displays, PDP is being developed widely as the most promising candidate for high-definition wall-mounted TVs because of its features such as the largest size, high-speed response, wide viewing angle, and color reproducibility. . The phosphor used in this PDP has high efficiency and short afterglow with respect to excitation of vacuum ultraviolet rays (VUV) having a wavelength of 200 nm or less obtained by discharge of a rare gas, and sufficient color as three primary colors. In addition to having a degree and a hue, characteristics such as life characteristics and temperature characteristics are required. In particular, alkaline earth aluminate phosphors such as BaMgAl ₁₀ O ₁₇ : Eu, BaMgAl ₁₀ O ₁₇ : Eu, Mn and the like are greatly deteriorated with respect to vacuum ultraviolet rays and ion bombardment, and have problems in life characteristics.

  In addition, the PDP has a phosphor layer in the vicinity of the discharge space, and after preparing a coating composition in which the phosphor and an organic binder are mixed, it is applied to a predetermined site by a slurry method, a printing method, and the like, and then dried. It is formed by baking at a temperature of 400 ° C. to 600 ° C. in the air in order to volatilize the organic binder. However, the alkaline earth aluminate phosphor has a problem that the emission luminance is greatly reduced in this baking step. was there.

Regarding alkaline earth aluminate phosphors used in such light emitting devices such as PDPs, it is disclosed in Japanese Patent Application Laid-Open No. 2002-235074 etc. that phosphoric acid is coated. The maintenance rate and the luminance maintenance rate due to gas discharge were not sufficient, and improvement was required.
JP 2002-235074 A

  In addition to the problems described above, when forming a phosphor layer in a PDP, if the viscosity of the coating composition in which the phosphor and the organic binder are mixed is high, the coating characteristics are poor, and the thin and dense structure corresponding to a fine discharge cell structure is required. There was a problem that it was difficult to form a phosphor screen. Furthermore, since the phosphors of each emission color of red, blue, and green used in the PDP have different discharge start voltages, the discharge start voltages of the respective phosphors are adjusted to make the discharge characteristics of the RGB cells uniform. It was necessary to expand the characteristic margin and reduce erroneous discharge.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide a vacuum ultraviolet-excited phosphor having good emission luminance, paste baking luminance maintenance rate and luminance maintenance rate by gas discharge, and a vacuum ultraviolet excitation light-emitting device using the same. The object is to provide a vacuum ultraviolet excitation phosphor having good characteristics and capable of adjusting a discharge start voltage, and a vacuum ultraviolet excitation light emitting device using the same.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has found that the above problems can be solved by a vacuum ultraviolet ray excited phosphor coated with a surface treatment substance containing a specific phosphate. It came to complete.

(1) The vacuum ultraviolet-excited phosphor of the present invention has Eu, La, Y, Sc on the particle surface of an alkaline earth aluminate phosphor activated by at least one activator of Eu and Mn. , A vacuum ultraviolet-excited phosphor coated with a surface treatment substance containing a phosphate of at least one metal element selected from the group consisting of Tb and In, wherein the phosphate is contained in 1 mol of the metal element. On the other hand, it contains 2 mol or more of P element.

(2) The vacuum ultraviolet excitation phosphor of the present invention is the vacuum ultraviolet excitation phosphor according to (1), wherein the phosphate is a metaphosphate.

(3) The vacuum ultraviolet-excited phosphor according to the present invention is the vacuum ultraviolet-excited phosphor according to (1) or (2), wherein the surface treatment substance is coated in an amount of P element relative to the phosphor. It is the range of 0.25-2.3 mol% in conversion.

(4) A vacuum ultraviolet excitation light-emitting device of the present invention comprises the vacuum ultraviolet excitation phosphor described in (1) to (3).

(5) The plasma display device of the present invention includes a front substrate and a rear substrate that are spaced apart from each other by a predetermined distance, a plurality of barrier ribs that form a discharge space by the front substrate and the rear substrate, and a space between the barrier ribs. And a plurality of display electrodes facing and intersecting with the address electrodes, a plurality of discharge cells formed at intersections of the address electrodes and the display electrodes, and at least a part of the inner surface of the discharge cell A plasma display panel comprising: a phosphor layer formed on the substrate; a plasma display panel including a discharge gas sealed in a discharge space between the front substrate and the rear substrate; and a drive circuit for driving the plasma display panel. In the apparatus, the phosphor layer is a phosphor layer having the vacuum ultraviolet excitation phosphor described in (1) to (3).

  The phosphor of the present invention is a vacuum ultraviolet-excited phosphor that has good emission luminance, paste baking luminance maintenance rate and luminance maintenance rate due to gas discharge, good coating characteristics, and can adjust the discharge start voltage. By using the phosphor of the present invention, it is possible to provide a vacuum ultraviolet-excited light emitting device having excellent light emission characteristics, life characteristics and coating characteristics.

  Hereinafter, a vacuum ultraviolet excitation phosphor according to the present invention and a vacuum ultraviolet excitation light emitting device using the same will be described with reference to embodiments and examples. However, the present invention is not limited to these embodiments and examples.

  Here, the manufacturing method of the vacuum ultraviolet excitation fluorescent substance which concerns on one embodiment of this invention is demonstrated in detail. First, an alkaline earth aluminate phosphor is produced according to a normal method. Next, the phosphor is dispersed in a dispersion medium such as pure water or an aqueous ethanol solution, and a water-soluble compound of at least one metal element selected from the group consisting of Eu, La, Y, Sc, Tb, and In, and An aqueous solution of phosphoric acid or phosphate containing 3 mol or more of phosphorus element in 1 mol is added and stirred. An acid or base aqueous solution is added to the phosphor suspension to adjust the pH, and the surface treatment substance containing the metal phosphate is deposited on the phosphor surface. Thereafter, the treated phosphor and the dispersion medium are separated, dried, and the phosphor of the present invention coated with a surface treatment substance containing a phosphate containing 2 moles or more of P element per mole of metal element Get.

As the phosphor to be surface-treated, an alkaline earth aluminate phosphor that emits light by excitation with vacuum ultraviolet rays can be used. For example, a divalent europium activated alkali represented by the general formula (Ba, M) ₂ Al ₁₀ O ₁₇ : Eu (where M is at least one element selected from the group consisting of Sr, Ca, and Mg) Earth aluminate phosphor, represented by the general formula (Ba, M) ₂ Al ₁₀ O ₁₇ : Eu, Mn (where M is at least one element selected from the group consisting of Sr, Ca, and Mg) And divalent europium and divalent manganese co-activated alkaline earth aluminate phosphors.

As a water-soluble compound of at least one metal element selected from the group consisting of Eu, La, Y, Sc, Tb and In, halides, sulfates, nitrates, and the like of these metals can be used. For example, europium chloride, europium sulfate, europium nitrate and the like can be preferably used. As phosphoric acid or phosphate containing 3 mol or more of phosphorus element in 1 mol, trimetaphosphoric acid (H ₃ P ₃ O ₉ ), tetrametaphosphoric acid (H ₄ P ₄ O ₁₂ ), hexametaphosphoric acid (H ₆ P ₆ Metaphosphoric acid such as O ₁₈ ) or a salt thereof, polyphosphoric acid such as triphosphoric acid (H ₅ P ₃ O ₁₀ ), tetraphosphoric acid (H ₆ P ₄ O ₁₃ ) or a salt thereof, ultraphosphoric acid or a salt thereof, etc. Can be used. In particular, metaphosphoric acid or a salt thereof is preferable and a strong coating layer is considered to be formed. Here, the metaphosphoric acid is generally represented by (HPO ₃ ) _x (where x ≧ 3) and is a trimer or higher (polymerization degree of 3 or higher) phosphoric acid containing 3 mol or more of phosphorus element in 1 mol. . Metaphosphate is generally represented by (MPO ₃ ) _x (where x ≧ 3), and is a trimer or higher (polymerization degree of 3 or more) phosphate containing 3 mol or more of phosphorus element in 1 mol. is there. In view of availability and cost, it is advantageous to use hexametaphosphoric acid and a salt thereof. An aqueous solution of hydrochloric acid, nitric acid, sulfuric acid or the like can be used as the aqueous acid solution. Moreover, aqueous solutions, such as ammonia and an alkali metal hydroxide, can be used as an aqueous solution of a base.

  The surface treatment substance covering the phosphor surface is a surface treatment substance containing a phosphate of at least one metal element selected from the group consisting of Eu, La, Y, Sc, Tb and In, If the phosphate is a phosphate containing 2 mol or more of P element with respect to 1 mol of the metal element, the effect of the present invention is obtained, and the carbonate, hydroxide, halogen of the metal element is further contained in the surface treatment material. A compound other than a phosphate such as a chemical compound may be present at the same time. The coating amount of the surface treatment substance is preferably in the range of 0.25 to 2.3 mol%, more preferably in the range of 0.5 to 2.1 mol%, in terms of the amount of element P with respect to the phosphor, 0.6 The range of ˜1.5 mol% is more preferable. Even if the coating amount is less than 0.25 mol% or more than 2.3 mol%, the light emission luminance and the paste baking luminance maintenance ratio are lowered.

  The pH adjustment is preferably adjusted to a pH of 1 to 7 on the acidic side, more preferably in the range of pH 1 to 4.5, and still more preferably in the range of pH 1.5 to 3.0. When the pH is lower than 1, the coating amount of the surface treatment substance decreases, and when the pH is higher than 7, the surface treatment effect decreases due to the precipitation of hydroxide.

  Thus, the particle surface of the alkaline earth aluminate phosphor contains at least one metal element selected from the group consisting of Eu, La, Y, Sc, Tb and In. By coating a surface treatment substance containing a phosphate containing 2 mols or more of P element with respect to 1 mol, light emission luminance, paste baking luminance maintenance rate, and luminance maintenance rate by gas discharge are good, and coating A vacuum ultraviolet-excited phosphor having good characteristics and capable of adjusting the discharge start voltage can be obtained.

  The average particle diameter of the phosphor of the present invention is preferably in the range of 1.0 to 4.0 μm, more preferably in the range of 1.0 to 3.0 μm. Even if the average particle size is smaller than 1.0 μm, or conversely, larger than 4.0 μm, the emission characteristics are deteriorated when used in a vacuum ultraviolet ray excited light emitting device. When the average particle size is smaller than 1.0 μm, the luminous efficiency of the phosphor is low, and when it is larger than 4.0 μm, the surface area of the phosphor particles becomes small and the luminance of light emitted by vacuum ultraviolet excitation is lowered. The vacuum ultraviolet rays reach from the particle surface shallowly, and are excited at the particle surface to emit light. Therefore, when the average particle size is larger than 4.0 μm and the surface area of the phosphor particles is reduced, the emission luminance is lowered. On the other hand, when the average particle size is larger than 4.0 μm, the coating properties are also deteriorated. The median particle size is preferably in the range of 1.5 to 6.0 μm, and more preferably in the range of 1.5 to 4.0 μm. When the median particle size is larger than 6.0 μm, the coating properties are deteriorated.

  Next, a surface discharge type PDP is fabricated as a vacuum ultraviolet light excitation light emitting device using the vacuum ultraviolet light excitation phosphor of the present invention. First, a striped electrode is formed on the back substrate, a striped electrode is formed in a direction orthogonal to the electrode group, and an insulating film and MgO are formed thereon. Further, the aluminate phosphor of the present invention is formed on the counter substrate. The two substrates are combined with a gap of about 100 μm. In this gap, about 670 hPa of a mixed gas of He and Xe, a mixed gas of Ne and Xe, or the like that radiates vacuum ultraviolet rays by discharge is sealed to obtain a surface discharge type PDP.

  Next, the characteristics of the vacuum ultraviolet excitation phosphor of the present invention will be described with reference to the drawings. Regarding the phosphor obtained by changing the addition amount of sodium hexametaphosphate and europium nitrate in Example 1, the coating amount (P conversion) (mol%) of the surface treatment substance coated on the phosphor and each characteristic of the phosphor The relationship is shown in FIGS. That is, FIG. 3 shows the relationship with the emission luminance (%) of the vacuum ultraviolet excitation phosphor, FIG. 4 shows the relationship with the paste baking luminance maintenance rate (%), and the relationship with the luminance maintenance rate (%) by gas discharge. FIG. 5 shows the relationship with the paste viscosity, and FIG. 7 shows the relationship with the charge amount.

<Relationship between emission brightness and surface treatment substance coverage>
FIG. 3 shows the emission luminance (%) and the coating amount of the surface treatment substance (converted to P) for the BaMgAl ₁₀ O ₁₇ : Eu phosphor coated with europium metaphosphate as the surface treatment substance in the same manner as in Example 1. ) (Mol%) is plotted. Here, the emission luminance (%) was obtained by irradiating phosphors with 146 nm vacuum ultraviolet (VUV) rays using a 146 nm Kr excimer light irradiation device (H0012 type) manufactured by Ushio Electric Co., Ltd. It is a relative value when the emission luminance of the phosphor of Comparative Example 1 is taken as 100%. From this figure, it can be seen that the emission luminance is high when the coating amount (P conversion) of the surface treatment substance is in the range of 0.25 to 2.3 mol%.

<Relationship between paste baking luminance maintenance rate and surface treatment substance coverage>
FIG. 4 shows the relationship between the paste baking luminance maintenance rate (%) and the coating amount of the surface treatment material (P conversion) (mol%) for the BaMgAl ₁₀ O ₁₇ : Eu phosphor coated with europium metaphosphate. Are plotted. Here, the paste baking luminance maintenance ratio (%) is measured as follows. 1) A weight ratio of ethyl cellulose: 2- (2-butoxyethoxy) ethanol: terpineol is mixed at a ratio of 8:14:78 to prepare a vehicle. 2) The phosphor and the vehicle are mixed at a weight ratio of phosphor: vehicle = 1: 2 to prepare a paste. 3) The paste is dried at 170 ° C. for 1 hour and then baked at 500 ° C. for 1 hour. 4) Measure the luminance of the phosphor before and after baking at the time of 146 nm vacuum ultraviolet excitation. And the percentage of the value which divided the measured value after baking by the measured value before baking is calculated | required, and this is made into paste baking brightness | luminance maintenance factor (%). From this figure, the paste baking luminance maintenance rate is high when the coating amount of the surface treatment substance (P conversion) is in the range of 0.25 to 2.3 mol%, higher in the range of 0.3 to 2.1 mol%, and 0 It can be seen that the range of 0.5 to 1.5 mol% is further increased.

<Relationship between luminance maintenance rate by gas discharge and coating amount of surface treatment material>
FIG. 5 shows the relationship between the luminance maintenance rate (%) by gas discharge and the coating amount (P conversion) (mol%) of the surface treatment substance for the BaMgAl ₁₀ O ₁₇ : Eu phosphor coated with europium metaphosphate. The relationship is plotted. Next, a method for measuring the luminance maintenance ratio (%) by gas discharge will be described. 1) In the same manner as described above, a paste in which a phosphor and a vehicle are mixed is baked at 500 ° C. for 1 hour to prepare a phosphor measurement sample. 2) Using a vacuum ultraviolet spectrophotometer, the phosphor measurement sample is excited with vacuum ultraviolet light having a wavelength of 147 nm and the emission luminance is measured. 3) The same sample is set in a glass tube filled with a mixed gas of Ne: Xe = 95%: 5% at a pressure of 100 Pa, and arc discharge is performed with an irradiation power of 350 W and an irradiation time of 1 hour to forcibly degrade the phosphor particle surface. . 4) The sample subjected to forced deterioration is excited with vacuum ultraviolet light having a wavelength of 147 nm, and the emission luminance is measured. Then, the percentage of the value obtained by dividing the measured value obtained in 4) by the measured value obtained in 2) is obtained, and this is used as the luminance maintenance rate (%) by gas discharge.

  From this figure, the luminance maintenance rate due to gas discharge of the phosphor not coated with the surface treatment substance is 74.4%, but as the coating amount of the surface treatment substance increases, the luminance maintenance ratio due to gas discharge increases. It can be seen that the luminance maintenance ratio by gas discharge is saturated when the amount (P conversion) is around 2.3 mol%.

<Relationship between paste viscosity and surface treatment substance coverage>
FIG. 6 shows the relationship between the paste viscosity (Pa · s) and the coating amount (P conversion) (mol%) of the surface treatment substance for the BaMgAl ₁₀ O ₁₇ : Eu phosphor coated with europium metaphosphate. It is a plot. Next, a method for measuring the paste viscosity (Pa · s) will be described. 1) A weight ratio of ethyl cellulose: 2- (2-butoxyethoxy) ethanol: terpineol is mixed at a ratio of 8:14:78 to prepare a vehicle. 2) A paste is prepared by mixing 5 g of the phosphor and 10 g of the vehicle. 3) Using a viscometer (TVE-33H manufactured by Toki Sangyo), measure the paste viscosity at a rotor rotation speed of 12 rpm and a measurement temperature of 25 ° C. This figure shows that the paste viscosity of the phosphor not coated with the surface treatment substance is 23.1 Pa · s, but the paste viscosity decreases as the coating amount of the surface treatment substance increases.

  Regarding the dispersibility of the phosphor of the present invention, there was no difference even when the surface treatment substance was coated. However, the viscosity of the coating composition in which the phosphor and the organic binder were mixed was as shown in the figure. Since the coating properties are reduced and the coating properties are improved, it is possible to form a thin and dense phosphor screen corresponding to a fine discharge cell structure such as PDP.

<Relationship between charge amount and surface treatment substance coverage>
FIG. 7 shows the relationship between the charge amount (μC / g) and the surface treatment substance coating amount (converted to P) (mol%) for the BaMgAl ₁₀ O ₁₇ : Eu phosphor coated with europium metaphosphate. It is a plot. The charge amount (μC / g) is measured as follows using a blow-off powder charge amount measuring device manufactured by Toshiba Chemical. 200 mg of the phosphor is placed in a cylindrical container with nets on both ends, a high-pressure gas is blown from one end to separate the phosphors, and the phosphor is blown off (blows off) from the mesh openings to determine the charge amount. From this figure, it can be seen that the charge amount of the phosphor not coated with the surface treatment substance is on the plus side, but the charge amount is on the minus side as the surface treatment substance coating amount increases. When the charge amount of the phosphor is on the negative side, the discharge start voltage becomes high when used in a PDP, so that it can be effectively used when adjusting the discharge start voltage of the phosphor of each emission color. The charge amount of the phosphor is preferably −0.5 μC / g or less, and more preferably −1.0 μC / g or less.

  Examples of the present invention will be described below, but it goes without saying that the present invention is not limited to specific examples.

[Example 1]
50 g of a phosphor represented by the general formula (Ba _0.9 Eu _0.1 ) MgAl ₁₀ O ₁₇ (hereinafter referred to as “BAM phosphor”) is suspended in 250 ml of pure water. After adding 6.82 ml of sodium hexametaphosphate solution adjusted to 2.2 wt% using sodium hexametaphosphate having a polymerization degree of 6 (manufactured by Kanto Chemical Co., Ltd., deer special grade), 2.0 wt.% Of europium nitrate / n hydrate is used. 1.25 ml of a europium nitrate solution adjusted to% is added, and further a 3.6 wt% hydrochloric acid aqueous solution is added dropwise to adjust the pH to 2.0. Thereafter, the BAM phosphor coated with europium metaphosphate is obtained by sufficiently washing, draining, drying and sieving.

[Example 2]
A BAM phosphor coated with europium metaphosphate is obtained in the same manner as in Example 1 except that 4.55 ml of sodium hexametaphosphate solution and 0.83 ml of europium nitrate solution are added.

[Example 3]
A BAM phosphor coated with europium metaphosphate is obtained in the same manner as in Example 1 except that 2.27 ml of sodium hexametaphosphate solution and 0.42 ml of europium nitrate solution are added.

[Example 4]
1. Using sodium tripolyphosphate having a polymerization degree of 3 (manufactured by Yoneyama Chemical Co., Ltd., industrial grain), 7.89 ml of sodium tripolyphosphate solution adjusted to 1.9 wt% was added, and europium nitrate / n hydrate was used. A BAM phosphor coated with europium polyphosphate is obtained by the same method as in Example 1 except that 2.5 ml of europium nitrate solution adjusted to 0 wt% is added.

[Example 5]
It was prepared in the same manner as in Example 1 except that 2.5 ml of a lanthanum nitrate solution adjusted to 2.0 wt% using lanthanum nitrate hexahydrate instead of europium nitrate n hydrate was added, A BAM phosphor coated with lanthanum metaphosphate is obtained.

[Example 6]
Except for adding 2.5 ml of yttrium nitrate solution adjusted to 2.0 wt% using yttrium nitrate n hydrate (manufactured by Soekawa Rikagaku, purity 99.99%) instead of europium nitrate n hydrate A BAM phosphor produced by the same method as in Example 1 and coated with yttrium metaphosphate is obtained.

[Example 7]
It was prepared in the same manner as in Example 1 except that 0.67 ml of a scandium nitrate solution adjusted to 7.51 wt% using scandium nitrate · n hydrate instead of europium nitrate · n hydrate was added, A BAM phosphor coated with scandium metaphosphate is obtained.

[Example 8]
It was prepared in the same manner as in Example 1 except that 5.0 ml of a terbium nitrate solution adjusted to 1.0 wt% using terbium nitrate n hydrate instead of europium nitrate n hydrate was added. A BAM phosphor coated with terbium metaphosphate is obtained.

[Example 9]
Indium metaphosphate was prepared in the same manner as in Example 1 except that 0.2 ml of an indium nitrate solution adjusted to 32.3 wt% using indium nitrate instead of europium nitrate n-hydrate was added. A BAM phosphor coated with is obtained.

[Comparative Example 1]
A BAM phosphor that is not coated with a surface treatment substance is prepared.

[Comparative Example 2]
Example 1 except that 3.0 ml of orthophosphoric acid solution adjusted to 5.0 wt% using orthophosphoric acid (manufactured by Kanto Chemical Co., Ltd., deer special grade) instead of sodium hexametaphosphate (manufactured by Kanto Chemical Co., Ltd., deer special grade) is added. Thus, a BAM phosphor coated with europium orthophosphate is obtained.

  For the BAM phosphors obtained in Examples 1 to 9 and Comparative Examples 1 and 2, the type, amount of coating and molar ratio (P element / metal element) of the phosphate metal element are emitted by the method described above in Table 1. Table 2 shows the results of measurement of brightness, paste baking brightness maintenance ratio, brightness maintenance ratio by gas discharge, paste viscosity and charge amount. From Table 1, it can be seen that the phosphors of Examples 1 to 9 are coated with a phosphate containing 2 mol or more of P element per 1 mol of metal element. In addition, Table 2 shows that the phosphors of Examples 1 to 9 have higher emission luminance, paste baking luminance maintenance rate, and luminance maintenance rate by gas discharge than the phosphors of Comparative Examples 1 and 2. Furthermore, it turns out that the fluorescent substance of Examples 1-9 has a paste viscosity low compared with the fluorescent substance of Comparative Examples 1-2, and its application | coating characteristic is excellent.

  As described above, the vacuum ultraviolet-excited phosphor of the present invention has good emission luminance, paste baking luminance maintenance rate, and luminance maintenance rate due to gas discharge, good coating characteristics, and adjustment of the discharge start voltage. By using this vacuum ultraviolet-excited phosphor in a light-emitting device such as a PDP, it is possible to provide a vacuum ultraviolet-excited light-emitting device having excellent light emission characteristics, life characteristics, and coating characteristics.

It is a schematic diagram of PDP. It is sectional drawing of PDP. It is a figure which shows the relationship between the light-emitting luminance (%) of the fluorescent substance of this invention, and the coating amount (P conversion) (mol%) of a surface treatment substance. It is a figure which shows the relationship between the paste baking brightness maintenance factor (%) of the fluorescent substance of this invention, and the coating amount (P conversion) (mol%) of a surface treatment substance. It is a figure which shows the relationship between the brightness | luminance maintenance factor (%) by the gas discharge of the fluorescent substance of this invention, and the coating amount (P conversion) (mol%) of a surface treatment substance. It is a figure which shows the relationship between the paste viscosity (Pa * s) of the fluorescent substance of this invention, and the coating amount (P conversion) (mol%) of a surface treatment substance. It is a figure which shows the relationship between the charge amount (microC / g) of the fluorescent substance of this invention, and the coating amount (P conversion) (mol%) of a surface treatment substance.

Explanation of symbols

11: Front glass substrate 12: Back glass substrate 13: Display electrode 14: Address electrode 15: Dielectric layer 16: Protective layer 17: Dielectric layer 18: Partition wall 19: Phosphor layer 20: Discharge space

Claims (5)

  At least one selected from the group consisting of Eu, La, Y, Sc, Tb and In on the particle surface of the alkaline earth aluminate phosphor activated by at least one activator of Eu and Mn. A vacuum ultraviolet-excited phosphor coated with a surface treatment substance containing a phosphate of a metal element of at least a seed, wherein the phosphate contains 2 mol or more of P element per 1 mol of metal element A vacuum ultraviolet-excited phosphor.   The vacuum ultraviolet-excited phosphor according to claim 1, wherein the phosphate is a metaphosphate.   3. The vacuum ultraviolet excitation fluorescence according to claim 1, wherein the coating amount of the surface treatment substance is in the range of 0.25 to 2.3 mol% in terms of the amount of element P with respect to the phosphor. body.   A vacuum ultraviolet excitation light emitting device comprising the vacuum ultraviolet excitation phosphor according to claim 1.   A front substrate and a rear substrate that are spaced apart from each other by a predetermined distance, a plurality of barrier ribs that form a discharge space by the front substrate and the rear substrate, an address electrode formed between the barrier ribs, and the address electrode; A plurality of display electrodes that cross each other, a plurality of discharge cells formed at intersections of the address electrodes and the display electrodes, a phosphor layer formed on at least a part of the inner surface of the discharge cells, and the front substrate And a plasma display panel including a discharge gas sealed in a discharge space between the rear substrate and a driving circuit for driving the plasma display panel, wherein the phosphor layer is claimed in claim A plasma display device comprising a phosphor layer having the vacuum ultraviolet-excited phosphor according to 1 to 3

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