JP2000282023A - Fluorescent substance for cathode ray tube and cathode ray tube using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject fluorescent substance having suppressed coating- off in fluorescent film forming, so capable of forming a fluorescent screen having uniform thickness and excellent in adhesiveness by coating a photo- adhesive resin on the surface of fluorescent particles. SOLUTION: This fluorescent substance is obtained by comprising (A) a fluorescent particles such as an europium activated yttrium oxisulfide and (B) a photo-adhesive resin preferably such as diazomethyl aniline zinc chloride. Wherein the component B is coated on the surface of the component A at a ratio of preferably 0.05-0.5 wt.% more preferably 0.1-0.5 wt.%. The fluorescent substance is obtained by such as following steps; the component B is put into pure water and agitated, the resultant suspension of component B is put into a suspension of the component A obtained by putting the component A into pure water and sufficiently agitated, the resultant is sufficiently dried without filtration and sheaved. The fluorescent substance is useful for forming a fluorescent screen of cathode ray tube such as a color cathode ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a phosphor used for forming a phosphor film of a cathode ray tube such as a color cathode ray tube,
The present invention relates to a cathode ray tube using the same.

[0002]

2. Description of the Related Art A fluorescent film of a color cathode ray tube is generally manufactured as follows.

[0003] First, a phosphor is mixed with pure water, polyvinyl alcohol (PVA), ammonium bichromate, a surfactant, an emulsion, etc. to prepare a phosphor slurry, which is applied to the inner surface of a glass panel called a face plate. It is applied and dried to form a phosphor coating film. Next, ultraviolet rays are irradiated to the phosphor coating film through a shadow mask to cure the irradiated portion of the PVA, and then remove the phosphor film other than the portion cured by development. Thus, a stripe-like or dot-like fluorescent film is formed.

[0004] In recent years, with the spread of computers and the movement toward multimedia, there is a strong demand for higher quality display screens. As a characteristic, in addition to the dense and small stripes or dots to be formed, it is necessary that their thickness be uniform throughout. This is because if the thickness is not uniform, a uniform white screen cannot be obtained even if an attempt is made to emit a fluorescent screen to produce a white screen. Therefore, this is called White Uniformity (WH)
It is called quality and is an important characteristic that determines the quality of a cathode ray tube.

For this reason, conventionally, a phosphor coating film is formed as uniformly as possible, thereby obtaining uniformity of the phosphor film. However, actually, the film thickness before development is not maintained as it is after development, and a so-called film loss occurs in which a part of the film peels off during development. In addition, since the film loss does not occur uniformly on the entire phosphor film, it is difficult to ensure the uniformity of the phosphor film only by forming the phosphor coating film uniformly.

Therefore, it is important to suppress the occurrence of such film thinning in order to improve the quality of the phosphor screen.

An important characteristic factor for suppressing the occurrence of film thinning is the adhesion of the phosphor, and is expressed by, for example, the minimum size of the phosphor dots (or stripes) that can adhere to the face plate. That is, the size of a dot (or stripe) obtained by applying a phosphor, exposing with ultraviolet light, and then developing is reduced as the exposure amount of ultraviolet light is reduced, but becomes smaller than a certain exposure amount. ,
The development causes dots (or stripes) to come off the face plate. The size obtained by the exposure amount one step before the peeling is used as the value of the adhesive force. For example, when the adhesive force is 170 and 150, the adhesive force is better at 150.

Since the adhesion of the phosphor is greatly related to the properties of the phosphor slurry, various improvements have been made to the phosphor slurry. For example, adjusting the amounts of dichromates, surfactants, emulsions, etc., is routinely performed to control the adhesion. In addition, as a surfactant, instead of a generally used carboxylic acid-based anionic surfactant, a certain sulfonic acid-based or sulfuric acid-based organic substance is used to enhance the adhesive force, or to increase the phosphor particles. In order to enhance the adhesive force, a method of focusing on the phosphor itself, such as coating the surface with silica, alumina, or the like, or using flat phosphor particles, is actually used.

[0009] However, although all of them have a certain effect, they are not yet sufficient, and the development of a phosphor exhibiting more excellent adhesion that can suppress the occurrence of film thinning and form a high-quality phosphor film has been developed. Is strongly desired.

[0010]

As described above, in order to improve the quality of the phosphor screen, particularly, the quality of WH, the adhesion of the phosphor is increased, and the occurrence of film thinning and the like in the phosphor film forming step is suppressed to achieve uniformity. There is a demand for forming a film having a thickness.

However, the conventional method of increasing the adhesion of the phosphor does not sufficiently suppress the occurrence of film thinning, and there is a strong demand for the development of a phosphor exhibiting superior adhesion. It is rare.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a cathode ray having excellent adhesion and capable of forming a phosphor film having a uniform film thickness while suppressing phosphor film formation during phosphor film formation. It is an object of the present invention to provide a fluorescent material for a tube, and to provide a cathode ray tube with high quality by using such a fluorescent material.

[0013]

According to a first aspect of the present invention, there is provided a phosphor for a cathode ray tube, wherein a photo-adhesive resin is attached to the surface of the phosphor particles.

Here, the photo-adhesive resin is a substance which becomes sticky when irradiated with light, and is called a photo-sticky resin or the like. Examples of such a photo-adhesive resin include diazomethylaniline zinc chloride, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester,
6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester, 2,6-dimethyl-4- (2'-nitro-4 ', 5'-dimethoxy Phenyl)-
1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diisopropyl ester, 2,6- Dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid di (β-ethoxyethyl) ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1 , 4-Dihydropyridine-3,5-dicarboxylic acid-3-methyl-5-ethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid-
3-isopropyl-5-methyl ester, 2,6-dimethyl-4-
(2'-nitrophenyl) -3-aceto-1,4-dihydropyridine-5-dicarboxylic acid ethyl ester.
In the present invention, as described in claim 3, diazomethylaniline zinc chloride, 2,6-dimethyl-4-chloride
(2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, and 2,6-dimethyl-4-
It is preferable to use at least one member selected from the group consisting of (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester, and further, as described in claim 4, diazomethylaniline chloride. It is more preferable to use zinc.

Further, in the phosphor for a cathode ray tube of the present invention, the amount of the photo-adhesive resin to be attached is preferably 0.05% by weight or more and 0.5% by weight or less based on the phosphor. 0.1 weight as described in claim 6
% Or more and 0.5% by weight or less is more preferable.

According to a seventh aspect of the present invention, there is provided a cathode ray tube, comprising: a panel constituting an envelope; a fluorescent film formed on an inner surface of the panel; and an electron beam for irradiating the fluorescent film with an electron beam. In a cathode ray tube provided with a gun, the phosphor particles constituting the phosphor film are characterized in that a photo-adhesive resin is adhered to the surface of the phosphor particles.

In the phosphor for a cathode ray tube of the present invention, a photo-adhesive resin is adhered to the particle surface of the phosphor. As described above, the photo-adhesive resin exhibits adhesiveness when irradiated with light. Therefore, by using such a phosphor to which the photo-adhesive resin is adhered, the tackiness of the photo-adhesive resin is developed at the time of exposure and development in the process of forming the fluorescent film, and the bonding force between the phosphor particles is increased. I do. Therefore, for example, film thinning of the fluorescent film at the time of development is largely suppressed.

Further, in the cathode ray tube of the present invention, since a phosphor to which such a photo-adhesive resin is adhered is used, it is possible to obtain a phosphor film with reduced film loss with good reproducibility. The quality of the phosphor screen, particularly the WH quality, can be improved.

[0019]

Embodiments of the present invention will be described below.

The phosphor for a cathode ray tube of the present invention is obtained by adhering a photo-adhesive resin to the surface of phosphor particles. The material of the phosphor is not particularly limited, and various blue light-emitting phosphors, green light-emitting phosphors, and red light-emitting phosphors that have been conventionally used as phosphors for cathode ray tubes can be used.

For example, the blue light emitting phosphor is based on zinc sulfide represented by silver-activated zinc sulfide, and the green light emitting phosphor is based on zinc sulfide represented by copper activated zinc sulfide. Examples of the red light-emitting phosphor include those containing yttrium oxysulfide as a base, such as europium-activated yttrium oxysulfide.

The photo-adhesive resin to be adhered to the surface of the particles made of such a phosphor may be any as long as it shows adhesion when irradiated with light when forming a fluorescent film. Aniline zinc chloride, diazomethylaniline zinc chloride, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, 2,6-dimethyl-4- ( 2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester, 2,6-dimethyl-4- (2'-nitro-4 ', 5'-dimethoxyphenyl) -1,4- Dihydropyridine-3,5-dicarboxylic acid dimethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diisopropyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid di (β-d Toxiethyl) ester, 2,6-dimethyl-4-
(2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid-3-methyl-5-ethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4- Dihydropyridine-
3,5-dicarboxylic acid-3-isopropyl-5-methyl ester and 2,6-dimethyl-4- (2'-nitrophenyl) -3-
Aceto-1,4-dihydropyridine-5-dicarboxylic acid ethyl ester and the like. In the present invention, among others, diazomethylaniline zinc chloride, 2,6-dimethyl-4-
(2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, and 2,6-dimethyl-4-
It is desirable to use at least one member selected from the group consisting of (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester, and in particular, since diazomethylaniline zinc chloride is water-soluble. , Its use is desirable.

The photo-adhesive resin is used in an amount of 0.05% with respect to the phosphor particles.
It is preferable to adhere in the range of not less than 0.5 wt% and not more than 0.5 wt%. The adhesion amount of the photo-adhesive resin to the phosphor particles is 0.
If the amount is less than 05% by weight, there is a possibility that the effect of suppressing the film slippage of the fluorescent film may not be sufficiently obtained. On the other hand, if the amount exceeds 0.5% by weight, the fluorescent substance may remain to the point where it should be removed during development. In particular, the adhesion amount of the photo-adhesive resin to the phosphor particles is desirably 0.1% by weight or more and 0.5% by weight or less, which has a remarkable effect of suppressing film thinning and does not cause phosphor to remain in unnecessary portions. .

FIG. 1 shows that diazomethylaniline zinc chloride is adhered to the surface of a red light-emitting phosphor composed of europium-activated yttrium oxysulfide by a method described later, and a coating film is formed by a conventional method using the obtained phosphor. After forming, exposing and developing, the fluorescent film of 4 cm square area was peeled off and the weight was compared before and after development to calculate the film thinning rate. The film was calculated based on the amount of diazomethylaniline zinc chloride attached. It shows a change in the slip rate. As is clear from FIG. 1, the effect of suppressing film sliding is significantly exhibited when the amount of diazomethylaniline zinc chloride adhered to the phosphor particles is 0.05% by weight or more, and the effect is more clearly exhibited when the amount is 0.1% by weight or more. You can see that.

The effect of the photo-adhesive resin to suppress the film sliding is such that the adhesive force of the photo-adhesive resin at the time of exposure increases the bonding force between the phosphor particles, so that the phosphor particles are hardly peeled off. It is thought that it becomes.

The phosphor of the present invention can be produced, for example, according to the following method.

That is, first, a phosphor such as a europium-activated yttrium oxysulfide phosphor is put into pure water, and the mixture is sufficiently stirred to obtain a phosphor dispersion. Separately, a photo-adhesive resin such as diazomethylaniline zinc chloride is placed in pure water and sufficiently stirred to obtain a photo-adhesive resin dispersion.

Next, a predetermined amount of the photo-adhesive resin dispersion is
The phosphor particles are added to the dispersion liquid with good stirring. At this time, the phosphor particles may be surface-treated in advance with an inorganic compound such as zinc silicate or silica, or an organic compound such as polyacrylic acid. After the photo-adhesive resin dispersion is added and sufficiently stirred, it is sufficiently dried without filtration. Thereafter, by sieving through, for example, a 500 mesh sieve, the phosphor of the present invention is obtained.

The cathode ray tube of the present invention has a phosphor film using the phosphor of the present invention as described above. That is, the phosphor of the present invention is used as the phosphor of the phosphor film formed on the inner surface of the panel constituting the envelope and emitting light when irradiated with an electron beam from an electron gun. In the present invention, it is desirable to use the phosphor of the present invention for all of the blue light emitting phosphor, green light emitting phosphor, and red light emitting phosphor constituting the phosphor film of the color cathode ray tube.

The fluorescent film in the cathode ray tube of the present invention has a stripe shape or a dot shape. The stripe-shaped fluorescent film is effective for a CRT for a color television, and the dot-shaped fluorescent film is effective for a CRT for a computer display.

As described above, the cathode ray tube of the present invention is provided with a phosphor film made of a phosphor to which a photo-adhesive resin is adhered. A high fluorescent film can be obtained. As a result,
In particular, it is possible to provide a color CRT with improved White Uniformity (WH) quality.

[0032]

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

Example 1 First, 100 g of europium-activated yttrium oxysulfide phosphor
Was dispersed in 800 cc of pure water. To this dispersion, 0.5 cc of water glass (containing 25% of Si) and 1 g of a 25% colloidal silica solution were added, and 2 cc of a 0.4 mol / L (liter) aqueous zinc nitrate solution was added, followed by stirring for 1 hour. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation. After washing with pure water 5 times, 4 g of 1% diazomethylaniline zinc chloride dispersion (solvent: water) is added to the remaining phosphor dispersion (after removing the supernatant), and the mixture is stirred and filtered. It dried without sieving and obtained the phosphor of this invention.

Using the obtained phosphor of the present invention, a phosphor slurry was prepared by an ordinary method. This was applied on a glass panel for a color cathode-ray tube by an ordinary method to form a dot-shaped fluorescent film. The state of the fluorescent film thus formed was observed with an optical microscope, and the above-mentioned 4 cm
The fluorescent film on the four sides was peeled off, and the weight loss before and after the development was determined by comparing the weight before and after the development. The result was 70%.

Example 2 6 g of 1% diazomethylaniline zinc chloride dispersion was added.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 1.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 1.
72%.

Example 3 9 g of 1% diazomethylaniline zinc chloride dispersion was added.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 1.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 1.
76%.

Example 4 15 g of a 1% diazomethylaniline zinc chloride dispersion was added.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 1.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 1.
82%.

Example 5 50 g of a 1% diazomethylaniline zinc chloride dispersion was added.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 1.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 1.
95%.

Example 6 A diazomethylaniline zinc chloride dispersion having a concentration of 1% was used, and the amount added was 100 g.
A phosphor of the present invention was obtained in the same manner as in Example 1. Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning ratio of this fluorescent film after the development and before the development was determined in the same manner as in Example 1, and it was 98%.

Comparative Example 1 According to the conventional method, first, 100 g of europium-activated yttrium oxysulfide phosphor was dispersed in 800 cc of pure water. To this dispersion, 0.5 cc of water glass (containing 25% of Si) and 1 g of a 25% colloidal silica solution were added, and a further 0.4 m
ol / L (liter) of zinc nitrate aqueous solution (2 cc) was added and stirred for 1 hour. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation. After washing with pure water five times, the mixture was filtered and dried. After being sufficiently dried, the phosphor was obtained by sieving with a 500 mesh sieve.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 1 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 1.
68%.

Example 7 First, 100 g of europium-activated yttrium oxysulfide phosphor
Was dispersed in 700 cc of pure water. 0.2 cc of water glass (containing 25% of Si) and 0.5 g of a 20% colloidal alumina solution were added to the dispersion, and 1 cc of a 1 mol / L (liter) aqueous zinc nitrate solution was further added thereto, followed by stirring for 1 hour. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation. After washing with pure water 5 times, 8 g of 1% diazomethylaniline zinc chloride dispersion (solvent: water) is added to the remaining phosphor dispersion (after removing the supernatant), and the mixture is stirred and filtered. It dried without sieving and obtained the phosphor of this invention. Using the obtained phosphor of the present invention, a phosphor slurry was prepared by an ordinary method. This was applied on a glass panel for a color cathode-ray tube by an ordinary method to form a dot-shaped fluorescent film. The state of the fluorescent film thus formed is observed with an optical microscope, and the fluorescent film having an area of 4 cm square is peeled off, and the weight is compared before and after development. The calculated rate was 74%.

Example 8 The addition amount of a 1% diazomethylaniline zinc chloride dispersion was 10 g.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 7.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 7 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 7.
80%.

Example 9 The addition amount of 1% diazomethylaniline zinc chloride dispersion was 20 g.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 7.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 7 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 7.
88%.

Example 10 40 g of a 1% diazomethylaniline zinc chloride dispersion was added.
Except having been described, a phosphor of the present invention was obtained in the same manner as in Example 7.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 7 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 7.
93%.

Comparative Example 2 According to the conventional method, first, 100 g of europium-activated yttrium oxysulfide phosphor was dispersed in 700 cc of pure water. 0.2 cc of water glass (containing 25% of Si) and 0.5 g of a 25% colloidal alumina solution were added to this dispersion,
1 cc of a 1 mol / L (liter) aqueous solution of zinc nitrate was added and stirred for 1 hour. After stirring, the phosphor was allowed to settle, and the supernatant was removed by decantation. After washing with pure water five times, the mixture was filtered and dried. After being sufficiently dried, it was sieved to obtain a phosphor.

Using the obtained phosphor, a phosphor slurry was prepared in the same manner as in Example 7 and applied to a glass panel for a color cathode-ray tube to form a dot-shaped phosphor film. Further, the film thinning rate of this fluorescent film after development and before development was determined in the same manner as in Example 7.
69%.

[0055]

As described above, according to the phosphor for a cathode ray tube of the present invention, it is possible to suppress film thinning at the time of forming a fluorescent film and to improve its uniformity. Therefore, the cathode ray tube of the present invention provided with such a fluorescent film has high quality, in particular, WH
It will be excellent in quality.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the amount of diazomethylaniline zinc chloride adhering to phosphor particles and the rate of film loss.

Continued on the front page (72) Inventor Yasuhisa Makino 8th Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Toshiba Yokohama office (reference) 4H001 CA01 CA06 CC13 XA08 XA16 XA39 YA63

Claims (8)

[Claims] 1. A phosphor for a cathode ray tube, wherein a photo-adhesive resin is attached to the surface of phosphor particles. 2. The phosphor for a cathode ray tube according to claim 1, wherein the photo-adhesive resin is diazomethylaniline zinc chloride,
2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4 -Dihydropyridine-3,5-dicarboxylic acid diethyl ester, 2,6-dimethyl
-4- (2'-nitro-4 ', 5'-dimethoxyphenyl) -1,4-
Dihydropyridine-3,5-dicarboxylic acid dimethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diisopropyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid di (β-ethoxyethyl) ester, 2,6-dimethyl-4- (2'-nitrophenyl)
-1,4-dihydropyridine-3,5-dicarboxylic acid-3-methyl-
5-ethyl ester, 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid-3-
Isopropyl-5-methyl ester and 2,6-dimethyl
A phosphor for a cathode ray tube, comprising at least one member selected from the group consisting of -4- (2'-nitrophenyl) -3-aceto-1,4-dihydropyridine-5-dicarboxylic acid ethyl ester. 3. The phosphor for a cathode ray tube according to claim 1, wherein the photo-adhesive resin is diazomethylaniline zinc chloride,
2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid dimethyl ester, and
A phosphor for a cathode ray tube, comprising at least one member selected from the group consisting of 2,6-dimethyl-4- (2'-nitrophenyl) -1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester. 4. The phosphor for a cathode ray tube according to claim 1, wherein the photo-adhesive resin is diazomethylaniline zinc chloride. 5. The phosphor for a cathode ray tube according to claim 1, wherein an amount of the photo-adhesive resin adhered to the phosphor particles.
A phosphor for a cathode ray tube, wherein the phosphor content is 0.05% by weight or more and 0.5% by weight or less. 6. The phosphor for a cathode ray tube according to claim 1, wherein the amount of the photo-adhesive resin adhered is 0.1% by weight or more and 0.5% by weight with respect to the particles of the phosphor. A phosphor for a cathode ray tube, characterized in that: 7. A cathode ray tube comprising: a panel forming an envelope; a fluorescent film formed on an inner surface of the panel; and an electron gun for irradiating the fluorescent film with an electron beam. The cathode ray tube is characterized in that the phosphor particles have a photo-adhesive resin adhered to the surface thereof. 8. The cathode ray tube according to claim 7, wherein the fluorescent film has a stripe shape or a dot shape.