JP2002155275A - Fluorophor and treatment method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorophor treatment method capable of easily and efficiently removing an activator as a sulfide deposited on the surface of the fluorophor. SOLUTION: The objective fluorophor is obtained by the following process: powder of the general formula: MS (M is at least one element of Zn, Sr, Ca, Ba, Mg and Cd) is mixed with a compound of copper, silver or gold and a halogen compound; the mixture is baked at about 1,000-1,300 deg.C and ground, washed with distilled water, and dried; the thus dried powder is annealed at about 800 deg.C to obtain a fluorescent intermediate of the general formula: MS:R, X (R is at least one element of Cu, Ag and Au; and X is at least one element of Cl, Br, I); the thus obtained intermediate is added under agitation to an aqueous alcohol solution containing iodine and/or an iodine compound each having low toxicity and easy in waste liquid treatment; sulfide(s) deposited on at least the surface of the product is removed into the solution to effect washing the product; the solid resulted from a solid/liquid separation is washed, dried and classified, thus obtaining the objective fluorophor with high reflectance and emission luminance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to copper (Cu), silver (A)
g), a method for treating a phosphor having at least a surface thereof containing a sulfide containing at least one element of gold (Au) or a compound containing this sulfide as a main component, and a phosphor that has been subjected to this treatment. .

[0002]

2. Description of the Related Art Conventionally, as a thin light emitting element used for a backlight of a display of a cellular phone, for example, EL is used.
(electroluminescence) devices are known. This EL
The element emits light by dispersing dispersed EL phosphor particles in a dielectric substance and applying an AC voltage between transparent electrodes on at least one of both sides of the dispersed phosphor. The EL phosphor is made of, for example, zinc sulfide (ZnS).
And a general formula of introducing copper (Cu) or copper (Cu) and manganese (Mn) and halogen as an activator is Zn.
S: Cu, X or ZnS: Cu, Mn, X (X is
Chlorine (Cl), bromine (Br), and iodine (I)) are widely used.

Incidentally, the above zinc sulfide dispersion type EL
In the phosphor, conductive copper sulfide (Cu
_xS ) serves as a charge emission source, and emits light when an AC voltage is applied. When the EL phosphor is synthesized, copper as an activator is wet-mixed in the form of a water-soluble copper compound with zinc sulfide powder serving as a base and dried, and an alkali metal is appropriately added to grow phosphor crystal particles. The alkaline earth metal halide is dry-mixed, filled in a heat-resistant container such as quartz, and baked at 1000 to 1300 ° C., and a part of copper atoms are replaced with zinc atoms of zinc sulfide crystal to form a solid solution. As a result, a phosphor which acts as a fluorescent center and cannot be solid-solved and precipitates as conductive copper sulfide is obtained. The water-soluble copper compound added at the time of this synthesis is added in excess of about 10 times as much as the amount added at the time of synthesizing the phosphor used for the cathode ray tube of a normal color television, and as a result, A good EL phosphor can be obtained.

However, since conductive copper sulfide has a black body color, the phosphor after firing has a gray color and EL
When used as an element, light emission is remarkably absorbed, and light emission luminance is reduced. Further, the conductive copper sulfide located on the surface of the particles causes insulation breakdown of the EL element when an AC voltage is applied. For this reason, when used for EL elements, a cleaning treatment for removing conductive copper sulfide from the particle surfaces of the EL phosphor obtained after firing is performed.

[0005] As a washing treatment of the EL phosphor, there is conventionally known a method of dissolving and removing conductive copper sulfide located on the surface by contacting with an aqueous solution containing cyanide ions such as potassium cyanide.

However, the cyanide is highly toxic, and there is a problem that the treatment of the phosphor and the treatment of the waste liquid after washing are extremely complicated.

Therefore, for example, Japanese Patent Laid-Open Publication No.
Japanese Patent Application Laid-Open No. Hei 4-
No. 23886 Ethylenediaminetetraacetic acid
(EDTA; ethylenediaminetetraacetic acid), iminodiacetic acid (IDA), nitriloacetic acid
A method of washing with an aqueous solution containing a chelating agent having an acetic acid group such as NTA (nitrilotriacetic acid), an oxidizing agent and an alkaline agent, and an aqueous solution containing an ethyleneamine compound and an oxidizing agent described in JP-A-6-41525. There is known a method of cleaning with a method.

[0008]

However, Japanese Unexamined Patent Publication (Kokai) No. 51-2858989 discloses washing with an aqueous solution of ammonium hydroxide and aqueous solution of potassium polysulfide, and an aqueous solution containing a chelating agent having an acetic acid group, an oxidizing agent and an alkaline agent. In the washing treatment described in JP-A-4-23886 for washing and JP-A-6-41525 for washing with an aqueous solution containing an ethyleneamine compound and an oxidizing agent, washing using a highly toxic cyanide compound is performed. There is a problem that the removal rate of copper sulfide is not sufficient as compared with the treatment, and it is not possible to sufficiently improve the body color, the reflectance characteristics, and the emission luminance of the phosphor.

The present invention has been made in view of the above problems, and has as its object to provide a phosphor from which sulfide of an activator deposited on a surface is easily and efficiently removed, and a method for treating the phosphor.

[0010]

The phosphor according to claim 1 has a general formula of one of MS: R and MS: R, X, wherein M is zinc (Zn) or strontium.
(Sr), calcium (Ca), barium (Ba), magnesium (Mg), cadmium (Cd), and R is copper (Cu), silver (Ag), gold (A
u), at least one element of manganese (Mn), wherein X is a phosphor containing at least one element of chlorine (Cl), bromine (Br), and iodine (I), Washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound.

The general formula is MS: R and MS:
R is represented by one of X, and M is zinc (Z
n), strontium (Sr), calcium (Ca), barium (Ba), magnesium (Mg), cadmium (Cd), and R is copper (C
u), silver (Ag), gold (Au), and X is chlorine (Cl), bromine (Br), iodine
The phosphor containing at least one of the elements (I) is washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound, whereby the phosphor is precipitated on the surface and absorbs light to emit light. Sulfides that may cause a decrease in luminance and breakdown due to insulation discharge are dissolved in an alcohol aqueous solution and washed by at least one of iodine and an iodine compound having low toxicity and relatively easy waste liquid treatment. A high-luminance phosphor can be efficiently and easily obtained without dielectric breakdown.

[0012] The phosphor according to claim 2 is ZnS: Cu,
X and ZnS: a phosphor represented by any one of Cu, Mn and X, wherein X is at least one element of chlorine (Cl), bromine (Br), and iodine (I). And washed with an alcohol aqueous solution containing at least one of iodine and an iodine compound.

And ZnS: Cu, X and ZnS:
A phosphor represented by any one of Cu, Mn, and X, wherein X is at least one element of chlorine (Cl), bromine (Br), and iodine (I); By washing with an aqueous alcohol solution containing at least one of the following, sulfides that may precipitate on the surface and absorb light emission to cause a reduction in emission luminance and breakdown due to insulation discharge have low toxicity and waste liquid treatment. At least one of iodine and an iodine compound which is relatively easy
As a result, the phosphor is dissolved in an alcohol aqueous solution and washed, so that a high-luminance phosphor can be efficiently and easily obtained without causing dielectric breakdown.

The phosphor according to claim 3 is the phosphor according to claim 1 or 2, wherein the iodine compound has a general formula of A
A compound represented by I, wherein A is any one of potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), and ammonium (NH ₄ ); The formula is represented by BI ₂ , and B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and zinc (Zn).

As an iodine compound, the general formula is A
A compound represented by I, wherein A is any one of potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), and ammonium (NH ₄ ); The formula is represented by BI ₂ , and B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and a compound containing at least one of zinc (Zn) and a compound that is one of the elements, Precipitated sulfide is easily removed with high efficiency.

According to a fourth aspect of the present invention, in the phosphor according to any one of the first to third aspects, the alcohol aqueous solution contains an oxidizing agent.

[0017] By adding an oxidizing agent to the alcohol aqueous solution, the sulfide removal efficiency is improved.

The method for treating a phosphor according to claim 5 is characterized in that copper,
Silver, gold, a copper compound, a phosphor having at least a sulfide of sulfur and at least one of a silver compound and a gold compound on a surface thereof is treated with an aqueous alcohol solution containing iodine and at least one of the iodine compounds. It is to be washed.

A phosphor having at least a sulfide of at least one of copper, silver, gold, a copper compound, a silver compound and a gold compound and sulfur on a surface thereof is coated with at least one of iodine and an iodine compound. By washing with an aqueous alcohol solution containing one, sulfides on the surface of the phosphor, which may absorb light emission and cause a decrease in light emission luminance and dielectric breakdown, have low toxicity and are relatively easy to treat waste liquid. Since the phosphor is dissolved in an alcohol aqueous solution and washed by at least one of iodine and an iodine compound, a phosphor which does not cause dielectric breakdown and has high luminance can be efficiently and easily obtained.

According to a sixth aspect of the present invention, in the method for treating a phosphor according to the fifth aspect, the iodine compound is represented by the general formula AI, wherein A is potassium (K) or sodium (Na). , Rubidium (Rb), cesium (Cs), lithium (Li), ammonium (NH ₄ )
And the general formula is represented by BI ₂ , wherein B is magnesium (Mg), calcium (Ca), strontium.
(Sr), barium (Ba), and / or zinc (Zn).

And, as the iodine compound, the general formula is A
A compound represented by I, wherein A is any one of potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), and ammonium (NH ₄ ); The formula is represented by BI ₂ , and B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and a compound containing at least one of zinc (Zn) and a compound that is one of the elements, Precipitated sulfide is easily removed with high efficiency.

According to a seventh aspect of the present invention, in the method for treating a phosphor according to the fifth or sixth aspect, the alcohol aqueous solution contains an oxidizing agent.

By using an aqueous alcohol solution containing an oxidizing agent, the efficiency of sulfide removal is improved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A process for manufacturing a phosphor according to an embodiment of the present invention will be described below with reference to FIG.

First, the general formula is represented by MS, and M is zinc.
(Zn), strontium (Sr), calcium (Ca), barium (Ba), magnesium (Mg), cadmium (Cd)
At least one element of, for example, zinc sulfide (ZnS), strontium sulfide (SrS), calcium sulfide (CaS), barium sulfide (BaS), magnesium sulfide (MgS), powder such as cadmium sulfide (CdS) Then, copper as an activator, for example, a copper compound such as pentahydrate of copper sulfate is mixed to prepare a mixed powder. In preparing the mixed powder, it is preferable to prepare a mixed powder having a substantially uniform composition by, for example, adding distilled water, mixing the slurry, and then drying the slurry.

Then, a halogen as a co-activator, for example, an auxiliary agent such as magnesium chloride or strontium chloride is added to the obtained mixed powder, mixed well, and filled in a heat-resistant container such as a quartz crucible. It is fired at １1300 ° C. to obtain a sintered body.

Thereafter, the sintered body is washed with distilled water or the like to remove the flux and excess chloride, and is pulverized by a ball mill. In this pulverization, it is preferable that distilled water is added so that the particle size is substantially constant, wet pulverization is performed, and washing and drying are performed.

Then, the crushed material is filled in a heat-resistant container such as a quartz crucible, and is annealed by heating at, for example, about 800 ° C. in the air and gradually cooling to obtain a fluorescent intermediate. This fluorescent intermediate has a gray body color.

Next, the fluorescent intermediate is added to an alcohol aqueous solution containing at least one of iodine and an iodine compound prepared in advance and stirred, and after solid-liquid separation, washed with distilled water, dried and sieved. The particles are classified to a predetermined particle size by separation or the like to obtain a phosphor. In this case, an oxidizing agent may be added to the alcohol aqueous solution.

Here, as the iodine compound, the general formula is represented by AI, and A is potassium (K), sodium (Na),
Rubidium (Rb), cesium (Cs), lithium (Li),
A compound represented by any one of ammonium (NH ₄ ) and a general formula represented by BI ₂ , wherein B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and / or zinc (Zn), a compound of any one of the elements, and the general formula is represented by AI. iodine compounds and the formula can be used both iodine compound represented by BI ₂ that.

As the oxidizing agent, hydrogen peroxide (H ₂ O)
₂ ), potassium permanganate (KMnO ₄ ), sodium hypochlorite (NaClO), potassium periodate (KIO ₄ )
Peroxides, hypohalites, halogenates, perhalates, ozone-containing aqueous solutions and the like can be used. The oxidizing agent is preferably hydrogen peroxide in terms of handling.

Next, the operation of the above embodiment will be described with reference to experimental examples.

(Experimental Example) First, an experiment of washing the prepared fluorescent intermediate was conducted.

(Production of Fluorescent Intermediate) As the fluorescent intermediate,
As described above, after mixing in slurry form by adding distilled water to the powder 500g and pentahydrate _{(CuSO 4 · 5H 2 O)} 1.8g of copper sulfate zinc sulfide (ZnS), which 0.99 ° C. At 1
Dry for 2 hours to obtain a mixed powder. Then, 10 g of sodium chloride (NaCl) and magnesium chloride were added to this mixed powder.
(MgCl ₂ ) 15 g, strontium chloride (SrCl ₂ ) 1
After sufficiently stirring and mixing 5 g, the mixture is filled in a quartz crucible and fired at about 1150 ° C. for 6 hours to obtain a fired body. After washing the fired body five times with distilled water, 500 g of distilled water and 250 g of glass beads having a diameter of about 2 mm were put into a pot, and the ball was ground by a ball mill for about 30 minutes, and washed once with distilled water. Dry at about 120 ° C. for 12 hours. And
The crushed fired body is filled in a quartz crucible, and about 80 mm in air.
Anneal at 0 ° C for 1 hour to obtain a fluorescent intermediate. The fluorescent intermediate thus obtained has a gray body color.

(Washing Treatment) The obtained fluorescent intermediate was washed with an aqueous alcohol solution containing various prepared iodine and iodine compounds. That is, 500 g of the fluorescent intermediate was added to 1 liter of an aqueous alcohol solution in which alcohol and distilled water were mixed at a predetermined concentration and stirred, and iodine and an iodine compound, namely, potassium iodide (KI), sodium iodide (NaI), iodine Lithium iodide (LiI), ammonium iodide (NH ₄ I), magnesium iodide (MgI
_2), calcium iodide (CaI _2), strontium iodide (SrI _2), zinc iodide (ZnI _2), barium iodide
(BaI ₂ ) is added as shown in Table 1 and stirred for 2 hours. Then, the solid was settled and the supernatant was removed, and the supernatant was removed. After washing with distilled water three times, dehydration filtration, drying and sieving were performed to obtain a phosphor. In addition, when adding an oxidizing agent, one to which 50 ml of 34% hydrogen peroxide solution was further added was used. Table 1 shows an aqueous alcohol solution containing iodine, an iodine compound and an oxidizing agent.

Using a color difference meter (Model: TC-1500DX, manufactured by Tokyo Denshoku Co., Ltd.), the obtained phosphor was evaluated for body color, and the relative reflectance of the barium sulfate standard white plate was defined as 100%. I asked. Table 1 shows the results.

As a comparative sample, 500 g of the above-mentioned fluorescent intermediate without washing treatment (Comparative Example 1) and 500 g of the fluorescent intermediate were stirred and mixed in about 1 liter of distilled water, and 15 g of potassium cyanide was further added thereto for about 30 minutes. Let stand after stirring,
After removing the supernatant, the mixture was washed three times with distilled water, solid-liquid separated, dried and sieved, and a phosphor (Comparative Example 2) and 500 g of a fluorescent intermediate were stirred and mixed in about 1 liter of distilled water. 10 g of ethylenepentamine and 40% hydrogen peroxide 40
The mixture was left standing after stirring for about 60 minutes, the supernatant was removed, and the mixture was washed three times with distilled water, solid-liquid separated, dried, and sieved (Comparative Example 3). Was.

Further, the phosphor obtained as a luminance evaluation was dispersed in castor oil, and a gap of about 2 mm was formed between a pair of conductive glass plates.
An EL element was prepared by sandwiching the EL element at 00 μm, an alternating voltage of about 250 V, 400 Hz was applied between the conductive glass plates of the obtained EL element to emit light, and a luminance meter (manufactured by Minolta Co., Ltd., model: LS-100) was used. The brightness was measured. Table 1 shows the results.
Shown in Note that the luminance shown in Table 1 indicates a relative luminance when the luminance of the phosphor washed with potassium cyanide is set to 100%.

[0039]

[Table 1] From the results shown in Table 1, the appearance was improved by washing with an aqueous alcohol solution containing at least one of iodine and an iodine compound of the present embodiment, and further using an aqueous alcohol solution to which these oxidizing agents were added. As well as being white compared to the unwashed fluorescent intermediate,
A reflectance equal to or higher than that of a phosphor which has been conventionally washed with potassium cyanide was obtained, and it was found that the reflectance was improved by this washing treatment.

Further, the relative luminance is higher than that in the case of washing with potassium cyanide, and at least one of the iodine and the iodine compound of the present embodiment can be more easily treated than potassium cyanide, in which the waste liquid after handling and washing is complicated. It can be seen that the emission luminance is improved by about 10% and high luminance can be obtained when the cleaning treatment is performed using an aqueous alcohol solution containing one.

Further, it was confirmed that the use of an alcohol solution containing at least one of iodine and an iodine compound to which an oxidizing agent was added further improved the reflectance and emission luminance. That is,
By adding hydrogen peroxide (H ₂ O ₂ ), a reflectance of 5
Up to 7% and about 7 to 8% improvement in relative luminance were confirmed.

It is considered that the sulfide washed and removed was dissolved in the alcohol aqueous solution by a complex reaction with iodine.

As described above, the general formula is represented by MS: R or MS: R, X, and M is zinc (Zn), strontium (Sr), calcium (Ca), barium (Ba), magnesium (Mg). , Cadmium (Cd), and R is copper (Cu), silver (Ag), gold
X is at least one element of (Au), and X contains at least one element of chlorine (Cl), bromine (Br), and iodine (I), and absorbs light emission to reduce emission luminance. The phosphor, on which sulfide that may cause deterioration and dielectric breakdown is deposited on the surface, is washed with an alcohol aqueous solution containing at least one of iodine and an iodine compound, which has low toxicity and is relatively easy to treat a waste liquid. In addition, since sulfides are removed, a phosphor having high luminance without causing dielectric breakdown can be easily obtained.

Further, as the iodine compound, the general formula is AI
Wherein A is any one of potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), and ammonium (NH ₄ ); Is represented by BI ₂ and B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and a compound containing at least one of zinc (Zn) are used. Sulfides can be easily and efficiently removed.

Further, by using an alcohol solution containing at least one of iodine and an iodine compound to which an oxidizing agent is added, the sulfide removal efficiency is further improved, and the reflectance and the emission luminance are further improved. it can.

In the above embodiment, when the general formula is MS: R or MS: R, X, ZnS: Cu
Not limited to, for example, SrS: Cu used for an EL element,
CaS: Cu, BaS: Cu, Mg used for fluorescent lamps
S: Cu, ZnS: Ag used for a cathode ray tube,
ZnS: Ag, Cl, (Zn, Cd) S: Ag, Au, A
l, ZnS: Au, Al, ZnS: Au, Al, Cu, etc., M and R may be compounded instead of one element, and those having no halogen as a co-activator may be used.

The aqueous alcohol solution contains only iodine, contains only the iodine compound represented by the general formula AI, contains only a plurality of iodine compounds represented by the general formula AI, and contains iodine represented by the general formula BI _2. It may contain only a compound, may contain only a plurality of iodine compounds represented by the general formula of BI ₂ , or may be a combination thereof, and may further contain an oxidizing agent.

Further, as the iodine compound, the general formula is A
A compound represented by I, wherein A is any one of potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), and ammonium (NH ₄ ); The formula is represented by BI ₂ , and B is magnesium (M
g), calcium (Ca), strontium (Sr), barium (Ba), and zinc (Zn), not limited to those containing at least one of the compounds and other iodine. Compounds may be used. In addition, the above-mentioned iodine compound is preferable because handling is particularly easy.

In addition to these inorganic iodine compounds,
Similar effects can be obtained when an organic iodine compound such as popidone iodine (compound of polyvinylpyrrolidone and iodine) is used.

The oxidizing agent is not limited to one type but may be plural types.

[0051]

According to the phosphor of the first aspect, the general formula is represented by one of MS: R and MS: R, X, and M is zinc (Zn), strontium (Sr), Calcium (Ca), barium (Ba), magnesium (Mg),
R is at least one element of cadmium (Cd), R is at least one element of copper (Cu), silver (Ag), and gold (Au), and X is chlorine (Cl), bromine.
(Br) and a phosphor containing at least one element of iodine (I) is washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound. Sulfides that may absorb and cause a decrease in light emission brightness and dielectric breakdown may occur.
Since it is dissolved in an alcohol aqueous solution and washed with at least one of iodine and an iodine compound, which has low toxicity and is relatively easy to treat a waste liquid, a high-luminance phosphor can be efficiently and easily produced without dielectric breakdown. Obtainable.

According to the phosphor of the second aspect, ZnS:
Cu, X and ZnS: represented by any one of Cu, Mn and X, where X is chlorine (Cl), bromine (Br), iodine
The phosphor, which is at least one of the elements of (I), is washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound, so that the phosphor is precipitated on the surface, absorbs light, and emits light. Sulfides that may cause a decrease in luminance and breakdown due to insulation discharge are dissolved in an alcohol aqueous solution and washed by at least one of iodine and an iodine compound having low toxicity and relatively easy waste liquid treatment. A high-luminance phosphor can be efficiently and easily obtained without dielectric breakdown.

According to the third aspect of the present invention, there is provided the phosphor of the first aspect.
Or in addition to the effect of the phosphor described in 2, as an iodine compound, the general formula is represented by AI, and A is potassium (K), sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), Any one of ammonium (NH ₄ )
And the general formula is represented by BI ₂ , wherein B is magnesium (Mg), calcium (Ca), strontium.
(Sr), barium (Ba), and a compound containing at least one of zinc (Zn) are used, so that sulfides precipitated on the surface can be easily removed with high efficiency. Can be removed.

According to the fourth aspect of the present invention, there is provided the phosphor of the first aspect.
In addition to the effects of the phosphor described in any one of (3) to (3), the oxidizing agent is contained in the alcohol aqueous solution, so that the sulfide removing efficiency can be improved.

According to the method of treating a phosphor according to the fifth aspect, a phosphor having at least a sulfide of sulfur and at least one of copper, silver, gold, a copper compound, a silver compound and a gold compound on the surface. Since the body is washed with an alcohol aqueous solution containing at least one of iodine and an iodine compound, sulfides on the surface of the phosphor that may absorb light emission and cause a decrease in light emission luminance and dielectric breakdown may be generated. Since it is dissolved and washed in an alcohol aqueous solution by at least one of iodine and an iodine compound, which has low toxicity and is relatively easy to treat a waste liquid, it is possible to efficiently produce a phosphor which does not cause insulation discharge breakdown and has high brightness. Can be easily obtained.

According to the method for treating a phosphor according to the sixth aspect, in addition to the effect of the method for treating a phosphor according to the fifth aspect, as an iodine compound, the general formula is represented by AI, and A is potassium (K). , Sodium (Na), rubidium (Rb), cesium (Cs), lithium (Li), ammonium (NH ₄ ), and a compound represented by the general formula BI ₂ , wherein B is magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and a compound containing at least one of zinc (Zn) and a compound containing at least one of the elements. Precipitated sulfide can be easily removed with high efficiency.

According to the method for treating a phosphor according to the seventh aspect, in addition to the effect of the method for treating a phosphor according to the fifth or sixth aspect, since an alcohol aqueous solution containing an oxidizing agent is used, the sulfide removal efficiency is improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a process for manufacturing a phosphor according to an embodiment of the present invention.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Naofumi Isomura 1-15-1 Kamiogi, Suginami-ku, Tokyo Marusan Building Nemoto Special Chemical Co., Ltd. F-term (reference) 4H001 CA04 XA12 XA16 XA20 XA30 XA38 XA48 XA56 YA17 YA25 YA29 YA35 YA47 YA53 YA79

Claims (7)

[Claims] 1. The general formula is represented by one of MS: R and MS: R, X, wherein M is zinc (Zn), strontium (Sr), calcium (Ca), barium (Ba),
Magnesium (Mg), at least one element of cadmium (Cd), and R is copper (Cu), silver (Ag),
X is chlorine (Cl), bromine (Br), iodine in at least one element of gold (Au) and manganese (Mn)
A phosphor containing at least one element of (I), wherein the phosphor is washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound. 2. ZnS: Cu, X and ZnS: Cu,
Mn or X is represented by one of X and chlorine (C
1) a phosphor that is at least one element of bromine (Br) and iodine (I), and has been washed with an aqueous alcohol solution containing at least one of iodine and an iodine compound. Characterized phosphor. 3. An iodine compound represented by the general formula AI, wherein A is potassium (K), sodium (Na), rubidium.
(Rb), a compound of any one of cesium (Cs), lithium (Li), and ammonium (NH ₄ ), and a general formula represented by BI ₂ , wherein B is magnesium (Mg), calcium (Ca) ), Strontium (Sr), barium (Ba),
3. The phosphor according to claim 1, wherein the phosphor contains at least one of a compound that is one element of zinc (Zn). 4. The phosphor according to claim 1, wherein the alcohol aqueous solution contains an oxidizing agent. 5. A phosphor having at least a sulfide of sulfur and at least one of copper, silver, gold, a copper compound, a silver compound and a gold compound on a surface thereof is provided with at least one of iodine and an iodine compound. A method for treating a phosphor, characterized by washing with an aqueous alcohol solution containing a phosphor. 6. An iodine compound represented by the general formula AI, wherein A is potassium (K), sodium (Na), rubidium.
(Rb), a compound of any one of cesium (Cs), lithium (Li), and ammonium (NH ₄ ), and a general formula represented by BI ₂ , wherein B is magnesium (Mg), calcium (Ca) ), Strontium (Sr), barium (Ba),
6. The method for treating a phosphor according to claim 5, wherein the phosphor contains at least one of a compound that is one of zinc (Zn). 7. The method for treating a phosphor according to claim 5, wherein the alcohol aqueous solution contains an oxidizing agent.