JPH10121039A - Phosphor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fogging in forming a phosphor film for a colored cathode ray tube by using a phosphor to the surface of which both an org. compd. having amino and quaternary ammonium groups and silica-modified compd. particles have been adhered. SOLUTION: This phosphor, enabling the phosphor packing density at the phosphor film formation step to be secured and the fogging to be avoided, is obtd. by adhering an org. compd. having amino and quaternary ammonium groups and silica-modified compd. particles to the surface of a phosphor to thereby control the isoelectric point of ζ potential of the phosphor to 7 or lower and the blow-off charge in contact with PVA-coated beads to 5μC/g or higher. The org. compd. is gelatin, chitosan, etc., or PVA, polyvinylamine, etc., having quaternary ammonium groups. The silica-modified compd. particles are a colloidal sol self-dispersible in water and having an average particle size of 5-25μm, examples being silica-alumina-based, silica-ziroconiz-based, and silica-titania- based inorg. compds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor which emits light with high efficiency when excited by an electron beam, ultraviolet light or the like, and is applied to, for example, a display device such as a cathode ray tube or a fluorescent film such as a fluorescent lamp.

[0002]

2. Description of the Related Art The formation of a fluorescent screen on a color cathode ray tube is
For example, first, in order to improve the contrast, a black matrix (hereinafter, referred to as “BM”) made of a black non-luminescent material is provided on the inner surface of a face plate (glass panel).
Then, a pre-coat layer made of polyvinyl alcohol (hereinafter, referred to as “PVA”) or the like is formed thereon for better adaptation of the face plate and the phosphor slurry, and thereafter, a phosphor of three colors, that is, G (green), B
A phosphor slurry composed of (blue) and R (red) is sequentially applied for each color, and a phosphor film is formed by an optical printing method (exposure and development).

In the above-described fluorescent film forming step, there has been a problem that a so-called "fog phenomenon" occurs, thereby deteriorating the color purity and contrast of the fluorescent screen (Japanese Patent Publication No. 63-66876; 63-28429
No. 0). The above “fogging phenomenon” can be classified as follows. 1) BM fog: A phenomenon in which a phosphor is left on and adheres to the BM to deteriorate contrast. 2) Glass surface fogging: A phenomenon in which a phosphor applied first remains on and adheres to a glass surface corresponding to a position of a phosphor film to be applied later, thereby deteriorating the color purity of the phosphor film. 3) Other color surface fogging: A phenomenon in which phosphor particles to be applied later remain and adhere to the previously applied fluorescent film, thereby deteriorating the color purity of the previously formed fluorescent film. For example, B / G fog is G
F / R fog refers to the fog of R on the G fluorescent screen.

That is, by reducing these "fog",
In order to improve the color purity and contrast and to improve the filling degree of the fluorescent film to improve the luminance of the fluorescent film, further improvement of the phosphor particles is demanded.

[0005]

According to the present invention, the above-mentioned isoelectric point of the zeta potential on the surface of the phosphor and the blow-off charge generated upon contact with beads coated with PVA are controlled to appropriate values. An object of the present invention is to provide a phosphor that solves the problems of the degree of filling of the phosphor in the phosphor film and the fog phenomenon.

In order to solve the above problem, it is described that a "negatively charged substance" is uniformly attached to the surface of a phosphor to modify the surface (Japanese Patent Publication No. 63-67676).
JP, JP-A-5-28967, JP-B-44-1
No. 1769), the blow-off charge also decreases at the same time, and the fog worsens.

On the other hand, it is described that a "positively charged substance" is attached to the surface of the phosphor to modify the surface and increase the blow-off charge of the phosphor (Japanese Patent Publication No. 63-66).
No. 876), the isoelectric point of the zeta potential was higher than 7, and the fogging phenomenon was reduced, and the color purity and contrast of the fluorescent film were improved, but on the other hand, the fluorescent film was formed on the face plate. Since the degree of filling of the phosphor in the phosphor film is reduced, there is a problem that desired emission luminance cannot be obtained. Here, the blow-off charge refers to a charge generated upon contact with beads having a particle diameter of 200 to 800 μm, the surface of which is coated with PVA.

JP-A-63-284290 describes a phosphor in which small particles of an inorganic compound such as silica, titania, zinc oxide, and alumina are adhered via an organic compound such as gelatin or casein. Also, JP-A-3-27
No. 3088 describes a phosphor treated only with a cation-modified polyvinyl alcohol (a quaternary ammonium group-containing polyvinyl alcohol). Japanese Patent Publication No. Hei 7-116428 describes an organic compound such as gelatin and chitosan, an inorganic compound such as Zn, Al and Ba, and a phosphor coated with a layer made of colloidal silica having a particle size of 50 μm or less. Have been. Furthermore, Japanese Patent Application Laid-Open No. 1-284583 describes an EL phosphor coated with titania, alumina, silica or the like obtained by decomposing an alkoxide.

However, according to the above-mentioned conventional method, when pure silica, alumina, titania, zinc oxide, or the like is added, for example, the adhered particles are unlikely to adhere uniformly to the surface of the phosphor particles. No characteristics can be obtained. This is presumably because no appropriate charge adjustment was performed on the adhered particles.

Therefore, the present invention solves the above problems,
An object of the present invention is to provide a phosphor having good color purity and contrast by suppressing fog while securing the degree of filling of the phosphor in the phosphor film.

[0011]

The present invention has succeeded in solving the above problems by employing the following constitution. (1) A phosphor characterized in that particles of an organic compound containing an amino group or a quaternary ammonium group and silica-modified compound particles are attached to the surface of the phosphor.

(2) Gelatin, chitosan, hemicellulose and casein, and a plurality of quaternary ammoniums, wherein the organic compound containing an amino group and / or a quaternary ammonium group has a plurality of amino groups. Having a group,
The phosphor according to the above (1), which is at least one selected from polyvinyl alcohol, polyvinylamine and poly (di) arylamine.

(3) A silica-alumina-based, silica-titania-based, silica-zirconia-based, silica-yttria-based, silica-ZnO-based and silica-BaO-based silica-containing compound wherein the silica component constituting the silica-modified compound particles is inorganic. The phosphor according to the above (1) or (2), which is at least one member selected from the group consisting of:

(4) The silica component constituting the silica-modified compound particles is self-dispersible in water, is a colloidal sol having an average particle size of 5 to 25 μm, and has a zeta potential of the silica-modified compound particles. The phosphor according to any one of the above (1) to (3), wherein the phosphor has an isoelectric point of 3 or more.

(5) The isoelectric point of the zeta potential of the phosphor is 7
And a blow-off charge of 5 μC / g or more upon contact with a bead having a particle diameter of 200 to 800 μm, the surface of which is coated with polyvinyl alcohol. The phosphor according to any one of (1) to (4).

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted intensive studies on a method for controlling the surface charge of a phosphor in order to simultaneously secure the filling degree of the phosphor in the phosphor film and solve the problem of fogging.
By pre-attaching a specific compound to the phosphor surface, the isoelectric point of the zeta potential of the phosphor is controlled to 7 or less, and the particle diameter of the surface coated with PVA is 200 to 800 μm.
Can be controlled to 5 μC / g or more at the time of contact with the beads, and the problem that it has been difficult to achieve both at the same time can be solved.

The phosphor used in the present invention is a phosphor used for a phosphor film of a display device, for example, ZnS: Ag, Al, ZnS: Ag, C as a blue phosphor for a color cathode ray tube.
1, ZnS: Zn, etc., and Y ₂ O ₃ :
Eu, Y ₂ O ₃ S: Eu, etc., and Zn as a green phosphor.
S: Cu, Al, ZnS: Cu, Au, Al and the like can be mentioned, and in addition, there is no particular limitation as long as it is a known phosphor that can be used as a phosphor film such as a normal display device or a fluorescent lamp. The average particle size of these phosphors is usually about 1 to 10
The range of microns is suitable, and is appropriately selected depending on the definition required for the fluorescent film of the display device to be applied.

The "organic compound having an amino group or a quaternary ammonium group" used for the surface treatment of the phosphor of the present invention includes a water-soluble compound so that the phosphor can be uniformly treated in a water slurry. Is preferably a compound of
Further, in order to improve the alkali resistance of the coated organic substance, it is desirable that the organic substance is a cationic organic compound.

Examples of the organic compound satisfying such characteristics include gelatin, chitosan, hemicellulose and casein having a plurality of amino groups, and polyvinyl alcohol and polyvinyl having a plurality of quaternary ammonium groups. Luamine and poly (di) arylamine can be used.

In order to stably maintain the coating layer containing the silica-modified compound particles of the organic compound, the organic compound may be subjected to a crosslinking treatment with a crosslinking agent such as methylolmelamine or formalin.

Next, the “silica-modified compound particles” used for the surface treatment of the phosphor of the present invention are preferably colloidal sols having a hydrophilic hydroxyl group on the particle surface and having self-dispersibility in water. It is a silica compound which is combined with alumina, titania, zirconia, yttria, ZnO, and BaO to increase the isoelectric point to about 3 or more. Specifically, a silica-alumina-based, silica-titania-based or silica-zirconia-based silica-modified compound can be used from the viewpoint of relatively easy reduction of particle size and operability and cost. The normal silica sol has an isoelectric point of about 2, but by increasing the content ratio of alumina, titania, zirconia, etc. having a higher isoelectric point, the charge of the particles can be freely controlled, so that an organic compound is used as the phosphor. When adding
Aggregation between particles can be suppressed.

The average particle size of these silica-modified compounds is 5
A range of ２５25 mμ, preferably a range of 5１０10 mμ is appropriate. However, if the particle diameter of the silica-modified compound becomes extremely large, the adhesion to the phosphor surface becomes poor, and the desired effect cannot be obtained. In addition, as compared with the silica-modified compound used in the present invention, ordinary silica, when coexisting with an organic compound having an amino group and / or a quaternary ammonium group, is liable to agglomerate the sol itself, so Since it is difficult to attach the fluorescent film uniformly, clogging of the fluorescent film may be deteriorated.

To attach the "organic compound containing an amino group and / or a quaternary ammonium group" and the "silica-modified compound" to the phosphor, first dissolve or suspend those compounds, and then It is obtained by throwing into a slurry, sufficiently stirring, dehydrating and drying. The amount of the “organic compound containing an amino group or a quaternary ammonium group” is 10
0-1500 ppm, preferably 200-500 ppm
Is appropriate, and if less than 100 ppm,
The blow-off charge of the phosphor is less than 5 μC / g,
Poor fog characteristics. On the other hand, if it exceeds 1500 ppm, the isoelectric point of the zeta potential becomes higher than 7 and the clogging of the fluorescent film is deteriorated, which is not preferable.

The amount of the “silica-modified compound” is as follows:
Although it cannot be unambiguously determined by the particle size of the phosphor or the like, it is usually in the range of 300 to 15000 ppm, preferably in the range of 500 to 3000 ppm, more preferably 80 to 3000 ppm.
A range of 0 to 1000 ppm is appropriate. Adhesion amount is 30
If the amount is less than 0 ppm, the isoelectric point of the zeta potential of the phosphor tends to be higher than 7, and the clogging of the phosphor film is deteriorated.
On the other hand, if it exceeds 15000 ppm, the adhesion to the phosphor surface deteriorates, and the PVA slurry from the phosphor surface becomes poor.
It is not preferable because the phosphor particles are easily peeled off and agglomerated, or the clogging of the phosphor film is deteriorated.

As another method for obtaining the phosphor of the present invention, a method in which an organic compound having an amino group or a quaternary ammonium group is preliminarily attached to the surface of a “silica-modified compound” is applied in an air stream. The silica-modified compound particles may be dispersed in an air stream and adhere to the phosphor surface to which the “organic compound containing an amino group or a quaternary ammonium group” has been previously adhered.

In addition, an acrylic resin, gum arabic, etc., which is a binder for adhering a pigment on the phosphor surface, and a surfactant, etc., for improving the dispersibility of the phosphor in the phosphor coating slurry. Organic substances and inorganic compounds such as Zn, Al, and Mg may be coated to adjust the sensitivity and film thickness of the fluorescent film. In the phosphor of the present invention, these organic or inorganic compounds for surface treatment are attached. In such a case, usually, after these organic or inorganic compounds for surface treatment are attached in advance, the “organic compound containing an amino group or a quaternary ammonium group” and the “silica-modified compound” are added to the phosphor. It is desirable to obtain the phosphor of the present invention by attaching it to the surface.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the phosphor of the present invention is applied to a phosphor film of a color cathode ray tube will be described below. However, the present invention is not limited to this embodiment, and it is possible to reduce color fog and improve color purity and contrast. Needless to say, the present invention can be applied to a display device capable of obtaining a good image by improving the degree of filling of the film and improving the emission luminance. Further, according to the phosphor of the present invention, a dense and high-luminance phosphor film can be obtained even when used as a display device other than a color CRT or a fluorescent lamp.

Example 1 (Treatment of Green Phosphor) A green phosphor (ZnS: Cu, Al) for a color cathode-ray tube having an average particle size of 7.5 μm is suspended in water, and “silica-modified compound particles” are suspended therein. (Manufactured by Nippon Aerosil Co., Ltd., trade name MOX-80: average particle diameter 25 mμ, silica / alumina type) is 100 per phosphor
0 ppm and ordinary silica sol (manufactured by Nissan Chemical Co., Ltd., trade name ST-ZL: average particle diameter 80 mμ) are added to the phosphor at 3000 ppm, zinc sulfate is added thereto, pH is adjusted, and “ Silica-modified compound particles "and silica sol were deposited.

Next, in the water slurry of the phosphor subjected to the adhesion treatment, "an organic compound containing an amino group"
500 ppm of chitosan (manufactured by Kimitsu Corporation, trade name: MP) was previously dissolved in water, and the mixture was stirred, dehydrated, dried, and adhered to the outermost surface of the phosphor. Thereafter, the mixture was sieved with a 500-mesh stainless steel sieve to disperse the aggregate, thereby obtaining the phosphor of Example 1. This phosphor was used for measurement of clogging and fog (B / G) when a phosphor film was formed.

(Treatment of blue phosphor) Average particle size 7.5 μm
Blue phosphor for color CRT (ZnS: Ag, C
l) is suspended in water, and 1.2 w
t% cobalt aluminate blue pigment and 1500 ppm
Was added and the mixture was sufficiently stirred and then dehydrated to adhere the blue pigment to the phosphor surface. Then, water was added again to the phosphor, and 300 was added to the slurry.
0 ppm silica sol (manufactured by Nissan Chemical Industries, trade name ST-Z)
L: average particle diameter 80 mμ) and 1000 ppm of “silica-modified compound particles” (trade name SZ: silica-
The pH was adjusted by adding a zirconia-based, average particle size of 10 mμ) and an aqueous solution of zinc sulfate to attach “silica-modified compound particles” to the phosphor surface.

Next, a cationized polyvinyl alcohol (K-20, manufactured by Nippon Gosei Co., Ltd.), which is an "organic compound having a quaternary ammonium group," is contained in the water slurry of the phosphor.
0) was previously dissolved in water, and 500 ppm of this was added to adhere to the phosphor surface. Then, it was dehydrated, dried, and sieved with a 500-mesh sieve to disperse the particles, thereby obtaining the phosphor of the present invention. The clogging of the phosphor and the measurement of fog (B / G) of the other color when a phosphor film was formed using this phosphor were provided.

Example 2 Example 2 was repeated except that the amount of chitosan added was 1500 ppm in the step of attaching the “compound containing a quaternary ammonium salt” to the green phosphor (ZnS: Cu, Al). In the same manner as in Example 1, a green phosphor was produced and used together with the blue phosphor of Example 1 to measure the clogging of the phosphor and the fog (B / G) of the other color when a phosphor film was formed. Was served.

Example 3 In Example 1, in the step of attaching the “organic compound containing a quaternary ammonium salt” to the blue phosphor (ZnS: Ag, Cl), the cationic polyvinyl alcohol was used. A blue phosphor was produced in the same manner as in Example 1 except that 1000 ppm was added, and the phosphor was used together with the green phosphor of Example 1 to form a phosphor film. G).

Example 4 In Example 1, "silica-modified compound particles" were added to the blue phosphor (ZnS: Ag, Cl).
In the step of adhering, "silica-modified compound particles" (manufactured by Catalyst Kasei Co., Ltd., trade name: S-ZL;
T, average particle size 5 mμ, silica-titania type) 1000
A blue phosphor was produced in the same manner as in Example 1 except that ppm was added, and clogging of the phosphor and fogging of other colors (B / B) when a phosphor film was prepared using the green phosphor of Example 1 together with the phosphor.
G).

Example 5 In Example 1, "silica-modified compound particles" were added to the green phosphor (ZnS: Cu, Al).
In the step of adhering “silica-modified compound particles” (manufactured by Nippon Aerosil Co., Ltd., trade name MOX-80: average particle diameter 25 m).
μ, silica-alumina-based) instead of “silica-modified compound particles” (trade name: USBBB-120, manufactured by Catalyst Kasei Co., Ltd .; average particle size 10 μm, silica-alumina-based) 1000 ppm
A green phosphor was manufactured in the same manner as in Example 1 except that the phosphor was added, and clogging of the phosphor and other color surface fogging (B / G) when a phosphor film was prepared using the blue phosphor of Example 1 )
Was used for the measurement.

Example 6 In Example 1, the step of adhering the “silica-modified compound particles” to the green phosphor (ZnS: Cu, Al) was carried out using “silica-modified compound particles” (manufactured by Nippon Aerosil Co., Ltd.). MOX-80: average particle size 25m
When a green phosphor was produced in the same manner as in Example 1 except that the addition amount of μ, silica / alumina) was increased to 3000 ppm, and a phosphor film was formed using the blue phosphor obtained in Example 1 Clogging of phosphor and fogging of other colors (B /
G) was measured.

[Examples 7 and 8] In Example 1, in the step of attaching an “organic compound having an amino group” to the green phosphor (ZnS: Cu, Al), an acid treatment having an amino group instead of chitosan was performed. A green phosphor was produced in the same manner as in Example 1 except that gelatin (manufactured by Miyagi Chemical Co., Ltd.) and polydiaryl quaternary ammonium (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) were added to produce a green phosphor of Example 7. When the phosphor and the green phosphor of Example 8 were manufactured and used together with the blue phosphor obtained in Example 1 to form a phosphor film, the clogging of the phosphor and the fog (B / G) of other color surfaces were reduced. It was used for measurement.

[Embodiment 9] In Embodiment 1, the green fluorescent light was used.
(Silica-modified compound particles) in the body (ZnS: Cu, Al)
In the step of adhering silica, yttria-based particles (powder
1 mole of silica and Y _TwoO_Three1300 ° C mixture with 1 mole
And then pulverized to adjust the average particle size to about 0.5μm
Example 1 except that 3000 ppm was added.
A green phosphor was produced in the same manner as described above, and the blue phosphor obtained in Example 1 was produced.
Phosphor clogging when creating a phosphor film with phosphor
And other color surface fog (B / G).

Example 10 In Example 1, the step of adhering the “silica-modified compound particles” to the green phosphor (ZnS: Cu, Al) was carried out using silica-ZnO-based particles (1 mol of powdered silica and 2 mol of ZnO). Was baked at 1300 ° C. and then pulverized to adjust the average particle diameter to about 0.5 μm), except that 3000 ppm was added to produce a green phosphor. The obtained blue phosphor was used together with a blue phosphor to prepare a phosphor film, which was used for measurement of clogging of the phosphor and other-color surface fog (B / G).

[Comparative Example 1] In Example 1, the adhesion of the cationized polyvinyl alcohol of the “organic compound having a quaternary ammonium group” was omitted by the surface treatment of the blue phosphor (ZnS: Ag, Cl). A blue phosphor was produced in the same manner as in Example 1 except that the phosphor was used together with the green phosphor obtained in Example 1 to form a phosphor film. ).

Comparative Example 2 In Example 1, a green phosphor (ZnS: Cu, Al) and a blue phosphor (ZnS: A) were used.
g, Cl), respectively, except that the chitosan and the cationized polyvinyl alcohol attached to the green phosphor and the blue phosphor were produced in the same manner as in Example 1, respectively.
These phosphors were used to measure the clogging of the phosphor and the fogging of other colors (B / G) when a phosphor film was prepared.

Comparative Example 3 A phosphor was produced in the same manner as in Example 1 except that the silica-modified compound particles were omitted in the surface treatment of the blue phosphor of Example 1, and these phosphors were used. The clogging of the phosphor at the time of forming the phosphor film and the measurement of the other color surface fog (B / G) were performed.

(Evaluation) Examples 1 to 10 and Comparative Example 1
Evaluation of the film characteristics (the degree of filling of the phosphor in the phosphor film, the fogging of other colors) and the surface charge (isoelectric point of zeta potential and blow-off charge) of each of the phosphor films obtained in Steps (1) to (3) did. Table 1 shows the results. In addition, each evaluation method in Table 1 is as follows, respectively.

1) Phosphor Film Properties: "Filling degree": Each color phosphor is dispersed in an aqueous solution containing polyvinyl alcohol (PVA), ammonium dichromate (ADV) and a surfactant, and a phosphor coating slurry is prepared. Was prepared, first, a BM was provided on the inner surface of the face plate of the cathode ray tube by a known method. Next, the face
A precoat layer made of PVA was formed in order to make the splat and slurry well blended. Then three color phosphors,
That is, G (green) and B (blue) phosphor coating slurries were sequentially applied, and a fluorescent film was formed by an optical printing method (exposure and development) to form a fluorescent screen of a color cathode ray tube. The degree of filling of the phosphor in the phosphor film obtained at that time is analyzed by image analysis of the density of an image based on light transmission in the phosphor film when irradiated with a predetermined light source. Since the light transmission amount was small, the filling degree of the phosphor was evaluated based on the light transmission amount. In the table, 〇: good filling degree △: normal filling degree ×: poor filling degree

"Other color surface fogging": At the time of forming the fluorescent film in each of the above Examples and Comparative Examples, the phosphor particles to be subsequently applied remain on and adhere to the previously applied fluorescent film.
The extent to which the color purity of the previously formed fluorescent film deteriorates was measured by a stereoscopic microscope, and the number of adhered fluorescent materials was measured by visual observation. B / G: In the fog of B (blue) on the fluorescent film surface of G (green), 〇: Fog was hardly confirmed. Δ: Fog was slight, and the fog of other colors was normal. X: A lot of fog, and the fog of other color was remarkable

2) Surface charge: "Isoelectric point of zeta potential": The isoelectric point of the zeta potential of the phosphor is 0.01 N in the water slurry of the phosphor using a Zetasizer C manufactured by Malvern. Of KCl as an electrolyte, and then caseide and hydrochloric acid are added as appropriate to give p
An H-zeta curve is obtained, and the p value at which the zeta potential becomes zero is obtained.
The H value was taken as the isoelectric point.

"Blow-off charge": The blow-off charge of the phosphor is subjected to a predetermined surface treatment, and then the dried phosphor is passed through a stainless steel 500 mesh sieve. Next, polyvinyl alcohol (PV) as the phosphor and the carrier particles is used.
A particle having a particle diameter of 200 to 800 μm coated on the surface of A)
After putting the powder in a wide-mouth bottle, the phosphor is brought into contact with the PVA by vibrating, and then the phosphor and the PVA coating are performed using a blow-off powder charge measuring device (Model TB-200, manufactured by Toshiba Chemical Corporation). The mixture of beads was put in a measurement container (Faraday gauge), and this was blown with a high-pressure nitrogen gas for a predetermined time to blow off (blow-off) the fluorescent substance to be measured, and then to the Faraday gauge. The charge amount of di was determined. The charge (μC / g) generated upon contact with the PVA particles obtained by converting the charge value at that time was defined as the blow-off charge amount.

[0048]

[Table 1]

[0049]

According to the present invention, by adopting the above-mentioned structure, it is possible to secure a high phosphor filling degree of the phosphor film and to provide a phosphor with little fog and excellent color purity and contrast. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J29 / 20 H01J29 / 20

Claims (5)

[Claims] An amino group and / or a fourth group are provided on the phosphor surface.
A phosphor, comprising an organic compound containing a quaternary ammonium group and silica-modified compound particles attached thereto. 2. The gelatin, chitosan, hemicellulose and casein, wherein the organic compound containing an amino group and / or a quaternary ammonium group has a plurality of amino groups, and a plurality of quaternary ammonium groups. Having,
2. The phosphor according to claim 1, wherein the phosphor is at least one selected from polyvinyl alcohol, polyvinylamine and poly (di) arylamine. 3. A silica-alumina-based, silica-titania-based, silica-zirconia-based, silica-yttria-based, silica-ZnO-based, and silica-BaO-based silica component in which the silica component constituting the silica-modified compound particles is inorganic. The phosphor according to claim 1, wherein the phosphor is at least one selected from the group consisting of: 4. A silica component constituting the silica-modified compound particles has a self-dispersibility in water, is a colloidal sol having an average particle diameter of 5 to 25 μm, and has a zeta potential of the silica-modified compound particles. The phosphor according to any one of claims 1 to 3, wherein the phosphor has an isoelectric point of 3 or more. 5. A phosphor having a zeta potential isoelectric point of 7 or less and a surface coated with polyvinyl alcohol having a particle diameter of 200 to 800 μm. The phosphor according to any one of claims 1 to 4, wherein the phosphor is charged with a blow-off charge of at least / g.