JP2002371272A - Phosphor for cathode ray tube and color cathode ray tube obtained by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve coating qualities such as a color mixing quality and the like for a phosphor for a cathode ray tube used for forming a fluorescent screen of a color cathode ray tube in order to attain high resolution and high performance of a color cathode ray tube used for a color television, a computer display and the like. SOLUTION: At least one inorganic treating material 4 selected among silicon dioxide, zinc silicate, zinc hydroxide, zinc oxide, aluminum silicate, aluminum hydroxide, aluminum oxide and titanium oxide is made to adhere to the surface of a fluorescent substance particle 2. The surface of the phosphor particle 2 to which the inorganic treating material 4 adheres is covered with an organic treating material 5 comprising gelatin in an amount in the range of 0.005-0.15 mass% and propylene glycol alginate in an amount in the range of 0.001-0.1 mass%, each based on the phosphor particle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent material for a cathode ray tube used for forming a fluorescent film of a color television or a computer display, and a color cathode ray tube using the same.

[0002]

2. Description of the Related Art The fluorescent film of a color cathode ray tube used for a color television, a computer display, etc.
It is formed using phosphor slurries of each color including phosphors that emit red, green, and blue light, which are the three primary colors of light. Specifically, first, each phosphor is dispersed in an aqueous solution containing polyvinyl alcohol (PVA), ammonium bichromate, and a surfactant to prepare a phosphor slurry of each color.
Next, after applying the phosphor slurry to the inner surface of the glass panel, the phosphor coating film is exposed by irradiating ultraviolet rays through a shadow mask. UVA irradiated part is PVA
Is cured, and the uncured phosphor coating film is removed by a developing process. By sequentially performing such a procedure for the blue, green, and red phosphors, a stripe-like or dot-like phosphor film is formed.

[0003] In forming a phosphor film by applying the above-described coating method, the phosphor is required to have the following characteristics. That is, (1) that a dense striped or dot-shaped phosphor film is formed, (2) that no color mixing occurs, (3) that the adhesion to the panel is strong,
(4) The yield of the fluorescent film at the time of production is good, and the yield is not particularly reduced except at the surface of the fluorescent film. In recent years, particularly, a high-quality phosphor film for a color television or the like has been demanded. Therefore, a phosphor which sufficiently satisfies the above-mentioned conditions and has more excellent properties has been demanded.

[0004] Conventionally, various improvements and developments have been made on the surface treatment of the phosphor in order to satisfy the above-mentioned required characteristics of the phosphor. For example,
JP-21675 describes that by attaching zinc hydroxide (Zn (OH) ₂ ) to the phosphor surface, a phosphor film with less color mixture can be obtained. Japanese Patent Application Laid-Open No. H2-155983 describes that the surface of a phosphor is treated with zinc oxide (ZnO) to improve the adhesion and the color mixing quality.

[0005] In addition to the above-mentioned inorganic treatment materials, a surface treatment of a phosphor using an organic treatment material is also used.
For example, Japanese Patent Publication No. 6-29403 describes a phosphor in which the surface of phosphor particles to which an inorganic treatment material such as silica or alumina is adhered is treated with an organic binder containing at least casein. JP-A-8-176541 describes that color mixing quality is improved by attaching pectin, silica and metal hydroxide to the surface of phosphor particles. Further, JP-A-5-179235 discloses that a metal alginate is attached to the surface of a phosphor particle via a water-soluble organic binder such as gum arabic or gelatin, thereby preventing porosity or color mixing of the phosphor film. It is described.

[0006]

As described above, a phosphor for a cathode ray tube has been conventionally subjected to a surface treatment using various inorganic compounds and organic compounds. The quality of film characteristics is improved by forming a fluorescent film. However, color cathode ray tubes used for color televisions and computer displays are being developed to have higher definition and higher performance, and the phosphors used therein are required to have higher quality. However, conventional surface-treated phosphors cannot be said to have sufficient properties for such a high required level.

In particular, recently, a high-definition and high-quality phosphor film has been demanded for a color cathode ray tube for a computer display and the like. It is strongly desired to improve the color mixing quality of the stripe-shaped fluorescent film and the dot-shaped fluorescent film. Also, as color cathode ray tubes for color televisions have been increased in area and definition, it has been strongly desired to improve the coating quality of phosphors.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and has been made in order to cope with higher definition and higher performance of a color cathode ray tube used for a color television or a computer display. In particular, it is an object of the present invention to provide a fluorescent material for a cathode ray tube, which is capable of improving coating quality such as mixed color quality, and a color cathode ray tube using the same.

[0009]

According to a first aspect of the present invention, there is provided a phosphor for a cathode ray tube, comprising: phosphor particles; and silicon dioxide, zinc silicate,
A fluorescent material for a cathode ray tube, comprising: a zinc oxide, a zinc oxide, an aluminum silicate, an aluminum hydroxide, an aluminum oxide, and an inorganic processing material comprising at least one selected from titanium oxide, wherein the fluorescent material to which the inorganic processing material is attached The surface of the body particles is 0.00% relative to the phosphor particles.
It is characterized by being coated with an organic processing material containing gelatin in the range of 5 to 0.15% by mass and propylene glycol alginate in the range of 0.001 to 0.1% by mass.

According to a fourth aspect of the present invention, there is provided a color cathode ray tube, comprising: a panel constituting an envelope; and a red light-emitting phosphor, a green light-emitting phosphor, and a blue light-emitting phosphor formed on an inner surface of the panel. And a color cathode-ray tube including an electron source for irradiating the phosphor film with an electron beam, wherein at least one selected from the red-emitting phosphor, the green-emitting phosphor, and the blue-emitting phosphor is used. The seed is characterized by comprising the above-described phosphor for a cathode ray tube of the present invention.

In the phosphor for a cathode ray tube of the present invention, the surface of the phosphor particles to which the inorganic treatment material is attached is coated (surface treated) with gelatin and propylene glycol alginate. That is, gelatin (solidified material) and propylene glycol alginate adhere to the surface of the phosphor particles together with the inorganic treatment material. By performing such a surface treatment, the inorganic treatment material and the organic treatment material can be firmly adhered to the surface of the phosphor particles. Accordingly, the aggregation and the like of the phosphor particles are reduced, and the dispersibility is improved. As a result, it is possible to improve the color mixture quality and the like when the phosphor film is formed. By using such a phosphor, the quality and yield of the phosphor film can be improved, and the characteristics and reliability of the color cathode ray tube can be improved.

[0012]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view schematically showing a configuration of a phosphor for a cathode ray tube according to an embodiment of the present invention.
The phosphor 1 for a cathode ray tube shown in FIG. 1 has phosphor particles 2 and a coating layer 3 covering the surface thereof. Here, as the phosphor particles 2, various phosphors used for forming a phosphor film of a color cathode ray tube are used. As a phosphor for a color cathode ray tube, typically, a red light emitting phosphor, a green light emitting phosphor,
Blue light-emitting phosphors can be mentioned, and the present invention is applicable to any of these phosphors. The phosphor used in the present invention is not particularly limited, but representative examples of the phosphor applicable to the present invention are shown below.

The red light-emitting phosphor for a cathode ray tube includes an acid
Known are those based on yttrium sulfide.
A typical example is europium-activated yttrium oxysulfide
(Y _TwoO_TwoS: Eu) phosphor. Eu at this time
The activation amount is preferably, for example, in the range of 3 to 8% by mass.
No. In addition, copper and aluminum are used as green light-emitting phosphors.
Activated zinc sulfide (ZnS: Cu, Al) phosphor, copper, gold
And aluminum activated zinc sulfide (ZnS: Cu, A
(u, Al) phosphor or the like is used. Blue emitting phosphor and
Silver-activated zinc sulfide (ZnS: Ag) phosphor
And chlorine activated zinc sulfide (ZnS: Ag, Cl) phosphor
Is used.

The surface of the phosphor particles 2 as described above is covered with a coating layer 3 containing an inorganic treatment material and an organic treatment material.
That is, first, silicon dioxide (SiO ₂ ), zinc silicate (Zn ₂ SiO ₄ ), zinc hydroxide (Zn (OH) ₂ ), zinc oxide (ZnO), and aluminum silicate (Al ₂ SiO ₅ ), aluminum hydroxide (Al
(OH) ₃ ), aluminum oxide (Al ₂ O ₃ ), and titanium oxide (TiO ₂ ).

It is preferable that the inorganic treatment material 4 is attached to the phosphor particles 2 in a range of 0.001 to 0.8% by mass. The amount of the inorganic treatment material 4 attached to the phosphor particles 2 is 0.00
If the amount is less than 1% by mass, there is a possibility that the effect of improving the dispersibility and adhesion due to the adhesion of the inorganic treatment material 4 may not be sufficiently obtained. On the other hand, when the adhesion amount of the inorganic treatment material 4 exceeds 0.8% by mass, the dispersibility and the luminance are reduced conversely, and defects such as color mixing easily occur when the fluorescent film is formed. It is more preferable that the amount of the inorganic treatment material 4 attached is in the range of 0.01 to 0.5% by mass based on the phosphor particles 2.

The surface of the phosphor particles 2 having the above-mentioned inorganic treatment material 4 attached thereto is coated with an organic treatment material 5 containing gelatin and propylene glycol alginate. The surface of the phosphor particles 2 to which the inorganic treatment material 4 is adhered is coated with an organic treatment material 5 containing gelatin and propylene glycol alginate to increase the adhesion strength of the inorganic treatment material 4 to the phosphor particles 2. be able to. Also, by using propylene glycol alginate in combination, it is possible to increase the adhesive strength of gelatin itself.

The gelatin used in the present invention is not particularly limited, and various kinds of gelatin such as general gelatin, acidic gelatin and alkaline gelatin can be applied. The coating amount with gelatin is preferably in the range of 0.005 to 0.15% by mass based on the phosphor particles 2.
If the amount of coating with gelatin is less than 0.005% by mass, the effect of coating with gelatin cannot be obtained. On the other hand, if the amount of coating with gelatin exceeds 0.15% by mass, the quality of the dot- or stripe-shaped phosphor film is reduced, and the phosphor becomes a hard block in the drying step after coating, resulting in reduced workability thereafter. In addition to this, agglomeration and dispersibility deteriorate, so that a dense fluorescent film cannot be obtained. The coating amount by gelatin is 0.01-0.1% by mass
It is more preferable to be within the range.

The propylene glycol alginate used together with the above-mentioned gelatin is an ester in which propylene oxide is added to a carboxyl group of alginic acid, and functions as a stabilizer for gelatin or an agent for improving dispersibility. By coating the surface of the phosphor particles 2 with the organic treatment material 5 using such propylene glycol alginate in combination, the adhesion of the inorganic treatment material 4 and the organic treatment material 5 to the phosphor particles 2 can be enhanced. .

The amount of the propylene glycol alginate used is preferably in the range of 0.001 to 0.1% by mass based on the phosphor particles 2. When the coating amount of propylene glycol alginate is less than 0.001% by mass,
The effect due to the combined use with gelatin cannot be obtained. On the other hand, when the coating amount of the propylene glycol alginate exceeds 0.1% by mass, the dot-like or stripe-like fluorescent film may be reduced in cut quality. Alginate propylene glycol ester coverage is 0.00
More preferably, it is in the range of 5 to 0.05% by mass.

In this way, by coating the surface of the phosphor particles 2 with the organic treatment material 5 using gelatin and propylene glycol alginate together with the inorganic treatment material 4, the inorganic treatment material 4 is The bonding strength can be increased, and the bonding strength and film characteristics of the organic processing material 5 itself can be further improved. Therefore, the phosphor 1 for a cathode ray tube which has been subjected to such a coating treatment (surface treatment) has low cohesiveness and can greatly improve dispersibility, thereby improving the color mixing quality when a phosphor film is formed. It becomes possible. This greatly contributes to improving the characteristics, quality, and yield of the fluorescent film used for the color cathode ray tube.

The phosphor for a cathode ray tube of the present invention can be produced, for example, according to the following method.
That is, first, phosphor powder (phosphor particles 2) for a cathode ray tube is charged into pure water, and this is sufficiently stirred. The inorganic treatment material 4 is adhered to the surface of the phosphor particles 2 by adding the above-mentioned dispersion or aqueous solution of the inorganic treatment material 4 to the dispersion liquid of the phosphor particles 2 while stirring.

For example, when silicon dioxide and zinc hydroxide are used as the inorganic treatment material 4, a fixed amount of colloidal silica is added to the dispersion of the phosphor particles 1 while stirring, and an aqueous solution of zinc sulfide or zinc nitrate is further added. Add a certain amount. Then
By adding ammonia water or sodium hydroxide while stirring and adjusting the pH to 8 to 9, silicon dioxide and zinc hydroxide are adhered to the surface of the phosphor particles 1. In addition, when using the inorganic treatment material 4 other than these, the adhesion treatment is performed under the condition corresponding to each.

Next, the phosphor particles 2 to which the inorganic treatment material 4 has been adhered are washed several times with pure water or the like to remove residual ions, and then the previously dissolved gelatin aqueous solution and propylene glycol alginate solution are added. Add. After sufficiently stirring the mixture, the mixture is filtered and dried in the form of a cake at a temperature of 100 to 180 ° C., and the aggregated phosphor is sieved through a sieve to obtain the desired inorganic treatment material 4 and organic treatment material 5.
Can be obtained. If the drying temperature after filtration is lower than 100 ° C., it takes a long time to dry sufficiently, while if it exceeds 180 ° C., gelatin is deteriorated, which is not preferable. The drying temperature is more preferably in the range of 100 to 150 ° C.

The above-mentioned phosphor for a cathode ray tube according to the present invention is used for forming a phosphor film of a color cathode ray tube.
FIG. 2 is a cross-sectional view showing an example of a configuration of a main part of a color cathode ray tube using the phosphor for a cathode ray tube of the present invention.

A color cathode ray tube (color cathode ray tube) 10 shown in FIG. 1 has a glass panel 11 made of soft glass or the like as a face plate. A fluorescent film 12 is formed on the inner surface of the glass panel 11. Phosphor film 1
Reference numeral 2 has a shape in which a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor are arranged in a dot shape or a stripe shape, respectively. The dot-shaped fluorescent film is effective for a color cathode ray tube (CDT) for a computer display. The stripe-shaped fluorescent film is effective for a color cathode ray tube (CPT) for color television.

A shadow mask 13 is disposed inside the glass panel 11 with a predetermined gap from the fluorescent film 12 formed on the inner surface thereof. The shadow mask 13 has a large number of pores or slits not shown. The shadow mask 13 is connected to the glass panel 11 via a mask frame 14 and a frame holder 15.
Is supported by a panel pin 16 which is sealed and fixed in the vicinity of the opening.

Further, a neck portion 18 is connected to the glass panel 11 via a funnel portion 17, and these constitute a glass bulb. An electron gun 19 is disposed in the neck portion 18. The electron beam emitted from the electron gun 19 is scanned by a deflection yoke 20 and the like, and after passing through pores and slits of the shadow mask 13 in this state, the electron beam is emitted. The film 12 is irradiated.

In the color cathode ray tube 10 shown in FIG. 2, the phosphor for the cathode ray tube of the present invention is used as a phosphor constituting the phosphor film 12 which emits light by electron beam irradiation. In this case, the phosphor for a cathode ray tube of the present invention may be applied to all of the red light emitting phosphor, the green light emitting phosphor and the blue light emitting phosphor, or the phosphor for a cathode ray tube of the present invention may be applied to only one kind of phosphor. The body may be applied. Since the phosphor for a cathode ray tube of the present invention is excellent in dispersibility and stability as described above, it is possible to enhance the color mixing quality of the phosphor film 12 formed by using the phosphor, and thus the characteristics and quality of the color cathode ray tube 10. , And the yield can be improved.

[0029]

EXAMPLES Next, specific examples of the present invention and evaluation results thereof will be described.

Example 1 First, copper and aluminum activated zinc sulfide (ZnS: C
1 kg of u, Al) phosphor was suspended in 6 L (liter) of pure water. 5 m of water glass (containing 25% of Si) in this suspension
L, then add 10 mL of 10% colloidal silica solution and add
Stirred for 0 minutes. Thereafter, 50 mL of an 8% zinc sulfate solution was added, and the mixture was stirred for 30 minutes. Then, the phosphor was precipitated, and the supernatant was removed by decantation.

Next, the above-described phosphor was washed three times with 8 L of pure water, and then a 1% aqueous gelatin solution which had been
mL was added, and 20 mL of a 1% solution of propylene glycol alginate was further added. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 120 ° C. for 10 hours.

After the above-mentioned drying, the resultant is sieved with a 400-mesh sieve, so that the surface of the ZnS: Cu, Al phosphor particles is treated with an inorganic treatment material of 0.1% by mass of silica and 0.022% by mass of zinc silicate, Wt% gelatin and 0.007
A phosphor coated with an organic treatment material of propylene glycol alginate by mass%, that is, a target green light-emitting phosphor for a cathode ray tube was obtained. This green light-emitting phosphor for a cathode ray tube was subjected to characteristic evaluation described later.

Comparative Example 1 A green light-emitting phosphor for a cathode ray tube was prepared in the same manner as in Example 1 except that propylene glycol alginate was not used as an organic treatment material (only gelatin was used). Was subjected to the characteristic evaluation described below.

Example 2 First, zinc activated with silver and chlorine (ZnS: Ag, C
l) 1 kg of the phosphor was suspended in 6 L of pure water. To this suspension was added 5 mL of a 10% alumina solution, and then 50 mL of an 8% zinc sulfate solution.
Was adjusted to 8.5 and stirred for an additional 60 minutes. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation.

Next, the above-mentioned phosphor is washed three times with 8 L of pure water, and a 1% aqueous gelatin solution which has been
mL was added, and 20 mL of a 1% solution of propylene glycol alginate was further added. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 150 ° C. for 10 hours.

After the above-mentioned drying, the resultant is sieved with a 400-mesh sieve, whereby the surface of the ZnS: Ag, Cl phosphor particles is treated with an inorganic treatment material of 0.05% by mass of alumina and 0.12% by mass of zinc oxide, about 0.04% by mass. Wt% gelatin and 0.03%
A phosphor coated with an organic treatment material of propylene glycol alginate in an amount of mass%, that is, a target blue light emitting phosphor for a cathode ray tube was obtained. This blue light emitting phosphor for a cathode ray tube was subjected to the characteristic evaluation described later.

Comparative Example 2 A blue light emitting phosphor for a cathode ray tube was produced in the same manner as in Example 2 except that propylene glycol alginate was not used as an organic treating material (only gelatin was used). Was subjected to the characteristic evaluation described below.

Example 3 First, silver and chlorine activated zinc sulfide (ZnS: A) coated with a cobalt blue pigment using an acrylic resin as a binder
g, Cl) 1 kg of phosphor was suspended in 6 L of pure water. To this suspension was added 25 mL of a 10% colloidal silica solution, and then
After adding 25 mL of a 10% aluminum nitrate solution, the pH was adjusted to 9 with dilute aqueous ammonia with stirring, and the mixture was further stirred for 60 minutes. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation.

Next, the above-mentioned phosphor was washed three times with 8 L of pure water, and then a 50% aqueous solution of 1% gelatin dissolved in advance was added.
L was added, and 50 mL of a 1% solution of propylene glycol alginate was further added. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 100 ° C. for 12 hours.

After the above-mentioned drying, the mixture is sieved with a 400-mesh sieve to obtain a cobalt blue pigment-coated ZnS: A
g, Cl on the surface of the phosphor particles, 0.25% by mass of silica and 0.05% by mass of aluminum hydroxide inorganic treatment material, about
A phosphor coated with 0.018% by mass of gelatin and 0.015% by mass of an organic processing material of propylene glycol alginate, that is, a target blue light emitting phosphor for a cathode ray tube was obtained. This blue light emitting phosphor for a cathode ray tube was subjected to the characteristic evaluation described later.

Comparative Example 3 A blue light emitting phosphor for a cathode ray tube was prepared in the same manner as in Example 3 except that propylene glycol alginate was not used as an organic treating material (only gelatin was used). Was subjected to the characteristic evaluation described below.

Example 4 First, europium-activated yttrium oxysulfide (Y ₂ O
₂ S: Eu) and the phosphor 1kg was suspended in pure water 6L. To this suspension, 1 mL of a 10% titanium oxide solution and 5 mL of a 10% colloidal silica solution were added and stirred for 20 minutes. Next, after adding 30 mL of an 8% zinc sulfate solution, the pH was adjusted to 9 with dilute aqueous ammonia with stirring, and the mixture was further stirred for 60 minutes. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation.

Next, the above-described phosphor was washed three times with 8 L of pure water, and then a 30% aqueous solution of a 1% gelatin solution previously dissolved was washed.
L was added, and 300 mL of a 1% solution of propylene glycol alginate was further added. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 130 ° C. for 10 hours.

After the above-mentioned drying, the particles were sieved with a 400-mesh sieve to give 0.05% by mass of silica, 0.01% by mass of titanium oxide, and 0.065% by mass of the surface of the Y ₂ O ₂ S: Eu phosphor particles. Inorganic treatment of zinc hydroxide and about 0.012
A phosphor coated with an organic treatment material of mass% of gelatin and 0.1 mass% of propylene glycol alginate, that is, a target red light emitting phosphor for a cathode ray tube was obtained. This red light emitting phosphor for a cathode ray tube was subjected to the characteristic evaluation described later.

Comparative Example 4 A red light-emitting phosphor for a cathode ray tube was prepared in the same manner as in Example 4 except that propylene glycol alginate was not used as an organic treatment material (only gelatin was used). Was subjected to the characteristic evaluation described below.

Example 5 First, europium-activated yttrium oxysulfide (Y ₂ O ₂₎ coated with red iron oxide using an acrylic resin as a binder
S: Eu) 1 kg of the phosphor was suspended in 6 L of pure water. To this suspension was added 10 mL of a 10% colloidal silica solution,
1 mL of a 25% water glass solution was added and stirred for 10 minutes. Next, after adding 2 mL of a 50% aluminum sulfate solution, the pH was adjusted to 5.8 with a 10% aqueous potassium hydroxide solution with stirring, and the mixture was further stirred for 60 minutes. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation.

Next, the above-mentioned phosphor was washed three times with 8 L of pure water, and then a 20% aqueous solution of 1% gelatin which had been dissolved beforehand was added.
L was added, and 150 mL of a 1% solution of propylene glycol alginate was further added. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 120 ° C. for 10 hours.

After the above-mentioned drying, the particles are sieved with a 400-mesh sieve to give an inorganic treatment of 0.1% by mass of silica and 0.035% by mass of aluminum silicate on the surface of the Vengara pigment-coated Y ₂ O ₂ S: Eu phosphor particles. A phosphor coated with the material and an organic treatment material of about 0.07% by mass of gelatin and 0.05% by mass of propylene glycol alginate, that is, a desired red light emitting phosphor for a cathode ray tube was obtained. This red light emitting phosphor for a cathode ray tube was subjected to the characteristic evaluation described later.

Comparative Example 5 A red-emitting phosphor for a cathode ray tube was prepared in the same manner as in Example 5 except that propylene glycol alginate was not used as an organic treating material (only gelatin was used). Was subjected to the characteristic evaluation described below.

Example 6 First, europium-activated yttrium oxysulfide (Y ₂ O ₂₎ coated with red iron oxide using an acrylic resin as a binder
S: Eu) 1 kg of the phosphor was suspended in 6 L of pure water. To this suspension was added 1 mL of a 10% colloidal silica solution, followed by 8 mL.
After adding 20 mL of a zinc sulfate solution, the pH was adjusted to 9 with dilute aqueous ammonia with stirring, and the mixture was further stirred for 60 minutes.
After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation.

Next, the above-mentioned phosphor was washed three times with 8 L of pure water, and then a 30% aqueous solution of a 1% gelatin solution which had been dissolved beforehand was added.
L, and then 10 mL of a 1% solution of propylene glycol alginate. Pure water was added thereto until the total amount became 1 L, and the mixture was stirred for 60 minutes. This was directly filtered to form a cake, and the cake was dried at 140 ° C. for 10 hours.

After the above-mentioned drying, the particles were sieved with a 400-mesh sieve to give an inorganic treatment of 0.01% by mass of silica and 0.05% by mass of zinc oxide on the surface of the Vengara pigment-coated Y ₂ O ₂ S: Eu phosphor particles. A phosphor coated with the material and an organic treatment material of about 0.01% by mass of gelatin and 0.002% by mass of propylene glycol alginate, that is, a target red light emitting phosphor for a cathode ray tube was obtained. This red light emitting phosphor for a cathode ray tube was subjected to the characteristic evaluation described later.

Comparative Example 6 A red light emitting phosphor for a cathode ray tube was produced in the same manner as in Example 6 except that gelatin was not used as an organic treatment material (only propylene glycol alginate was used). Was subjected to the characteristic evaluation described below.

Examples 1 to 6 and Comparative Examples 1 to 6 described above.
Each of the phosphors for a cathode ray tube was used to prepare a phosphor slurry for forming a phosphor film. Using each of these phosphor slurries, a phosphor film (dot phosphor formed by red, green and blue phosphors) was formed on the inner surface of the glass panel constituting the color cathode ray tube. It should be noted that the phosphors of the emission colors other than the phosphors of the respective examples (the phosphors of red and blue light emission in Example 1) used were the ones subjected to the same treatment as the comparative example. The color mixture quality was measured and evaluated for each of the fluorescent films thus manufactured. Table 1 shows the results.

The color mixture quality was evaluated as follows. First, a green phosphor, a blue phosphor, and a red phosphor are applied to a glass panel in this order, and color mixture (G / B color mixture) is evaluated based on, for example, the number of blue phosphors remaining on a certain green phosphor film surface. . Similarly, G / R color mixture is evaluated based on the number of red phosphors remaining on a certain green phosphor film surface, and B / R color mixture is evaluated based on the number of red phosphors remaining on a certain blue phosphor film surface. evaluated.

[0056]

[Table 1]

As is evident from Table 1, when each of the phosphors of Examples 1 to 6 is used, a color mixture is small and a phosphor film excellent in film quality can be obtained. Furthermore, when a color cathode ray tube was manufactured using the phosphor of each of the above-described examples, all of them were excellent in characteristics and reliability.

[0058]

As described above, since the phosphor for a cathode ray tube of the present invention is excellent in dispersibility and the like, it is possible to greatly improve coating quality such as color mixing quality of a phosphor film formed using the phosphor. It becomes possible. Therefore, by forming a phosphor film using such a phosphor for a cathode ray tube of the present invention, a high-performance, high-quality phosphor film can be obtained at a high yield, and furthermore, the characteristics and reliability of a color cathode-ray tube can be obtained. Can be improved. The color cathode ray tube of the present invention,
It is compatible with high definition and high performance of color televisions and computer displays.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a configuration of a phosphor for a cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic structure of a color cathode ray tube according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Phosphor for cathode ray tube, 2 ... Phosphor particles, 3 ... Coating layer, 4 ... Inorganic treatment material, 5 ... Organic treatment material, 10 ...
Color cathode ray tube, 11: glass panel, 12: fluorescent film, 13: shadow mask, 19: electron gun

Continued on the front page F term (reference) 4H001 CA01 CA06 CB06 CC03 CC04 CC05 CC13 XA16 XA30 YA13 YA29

Claims (4)

[Claims] 1. A phosphor particle and at least one member selected from the group consisting of silicon dioxide, zinc silicate, zinc hydroxide, zinc oxide, aluminum silicate, aluminum hydroxide, aluminum oxide and titanium oxide attached to the surface of the phosphor particle. A cathode ray tube phosphor comprising an inorganic treatment material comprising a seed, the surface of the phosphor particles to which the inorganic treatment material is attached,
A phosphor for a cathode ray tube, which is coated with an organic treatment material containing 0.005 to 0.15% by mass of gelatin and 0.001 to 0.1% by mass of propylene glycol alginate with respect to the phosphor particles. 2. The phosphor for a cathode ray tube according to claim 1, wherein the inorganic treatment material is attached in a range of 0.001 to 0.8% by mass with respect to the phosphor particles. 3. The phosphor for a cathode ray tube according to claim 1, wherein the phosphor particles are made of at least one selected from a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor. Characteristic phosphor for cathode ray tubes. 4. A panel constituting an envelope, a phosphor film formed on an inner surface of the panel and including a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor, and an electron beam applied to the phosphor film. 2. A color cathode ray tube comprising: an electron source for irradiation; and at least one selected from the red light emitting phosphor, the green light emitting phosphor, and the blue light emitting phosphor.
A color cathode ray tube comprising the phosphor for a cathode ray tube according to claim 2.