JP5267965B2 - Vanadium oxide phosphor - Google Patents

Description

The present invention relates to a phosphor made of vanadium oxide, and more particularly to a phosphor made of vanadium oxide suitable for a white LED. The present invention also emit white light to light in the ultraviolet and near ultraviolet as an excitation light, in the composition formula _A x _V y _{O z} (wherein, when y is 1, z is 2.9-3.1 is, x Is 0.8 to 1.2, A represents one or more selected from the group consisting of K, Rb, and Cs, and when y is 1 and z is 3.4 to 3.6, x is 0.9-1.1, and A represents one or more selected from the group consisting of Ca, Sr, and Ba.) .

  In recent years, white LEDs are used in mobile phones and various display devices, and at the same time, are attracting attention as indoor lighting devices instead of fluorescent lamps from the viewpoint of energy saving. White LEDs use near-ultraviolet or blue LEDs as excitation light sources, and produce white light by combining phosphors having emission intensities at various wavelengths. Specifically, a blue LED emits yellow, green, and red phosphors as excitation light to obtain white light. (Patent Document 1)

  However, the white light of white LEDs obtained by combining multiple phosphors also has problems such as color loss and strong light emission only at specific wavelengths, and efforts to improve color rendering properties are required for use as indoor lighting. Necessary. For this reason, it is most desirable that the phosphor used in the white LED for illumination has a wide emission wavelength, does not have a sharp emission peak at a specific wavelength, and further exhibits white fluorescence with as few phosphor combinations as possible. In recent years, phosphors having a relatively wide emission wavelength such as an α-sialon phosphor excited by a blue LED (Patent Document 2) have been developed. However, since the emission spectrum range is not sufficiently wide, it alone becomes white. In addition, white color can be obtained in combination with some phosphors. Thus, it was difficult to show white fluorescence with a color rendering property as good as possible with a single substance.

JP-A-11-31845 JP 2006-257326 A J. et al. Inorg. Nucl. Chem. 40 (1978) 215.

Conventionally, among the phosphors using blue or ultraviolet LEDs as an excitation light source as described above, there is no single substance that exhibits white fluorescence with good color rendering, and white is obtained by combining various fluorescent wavelengths of a plurality of substances. However, in the case of lighting applications, it is desirable to develop a single substance exhibiting white fluorescence from the viewpoint of color rendering properties and manufacturing cost.
Accordingly, an object of the present invention is to provide a phosphor that emits white light with a single substance. It is another object of the present invention to provide a phosphor that emits white light when excited by ultraviolet and near ultraviolet rays using a single substance.

In order to solve the above-mentioned problems, the present inventors have devised variously, and light emission from rare earth ions having f electrons, which is often used in phosphor materials, has been introduced without largely depending on the surrounding coordination environment. In order to show the emission spectrum corresponding to the energy level of the ion, attention was paid to the fact that the emission peak showed a relatively narrow half-value width. In order to solve the above-mentioned problems, the present inventors have worked on the synthesis of a phosphor exhibiting a broad fluorescence emission that does not depend on the f-electron emission center ion or the like. First, it is known that vanadium oxide (hereinafter sometimes referred to as V oxide) emits light due to a charge transfer transition of (VO ₄ ) ^3- in YVO ₄ or Mg ₃ (VO ₄ ) ₂ . (Non-Patent Document 1) Searching for a substance containing a VO ₄ tetrahedron in its structure, surprisingly, AVO ₃ (A represents K, Rb, Cs) that does not activate the luminescent center ion is 250. It has been found that the fluorescence spectrum emits strong white fluorescence having a maximum in the vicinity of 490 to 495 nm and broadly spreading in the range of 390 to 680 nm by excitation with ultraviolet and near ultraviolet light at ˜390 nm. Based on this knowledge, the present inventors have made further studies and finally completed the present invention.

That is, the present invention is summarized as follows.
The invention according to claim 1 has a composition formula A _x V _y O _z (wherein y is 1, z is 3.4 to 3.6, x is 0.9 to 1.1, and A is Ca, Sr. , And Ba selected from the group consisting of Ba and a vanadium oxide represented by the above-mentioned composition formula A _x V _y O _z The VO ₄ tetrahedrons share a vertex to form a dimer, and are vanadium oxides having a crystal structure in which A ions are arranged between two-dimensional layers formed from the dimer. More specifically, the invention according to claim 1 has a composition formula A _x V _y O _z (wherein y is 1, z is 3.4 to 3.6, x is 0.9 to 1.1, A Represents one or more selected from the group consisting of Ca, Sr, and Ba.) VO ₄ tetrahedrons form a dimer by sharing vertices, and the dimers are aligned. Thus, the invention is also characterized in that the vanadium oxide has a crystal structure in which a two-dimensional layer is formed in a plane substantially perpendicular to the 111 crystal axis and A ions are arranged between the two-dimensional layers.
The invention described in claim 2 is characterized in that in the phosphor according to claim 1, A may include one or more selected from the group consisting of Li, Na, and NH _4. To do.
Invention of Claim 3 is activated by 1 type, or 2 or more types chosen from Mn ^<2+ >, Sb < ³⁺ >, Bi ^<3+ >, and rare earth ions in the fluorescent substance of Claim 1 or 2. And

According to a fourth aspect of the present invention, in the phosphor according to any one of the first to third aspects, the phosphor emits white fluorescence that broadens in a range of 390 to 680 nm in fluorescence spectrum by excitation with ultraviolet or near ultraviolet light. Features.
According to a fifth aspect of the present invention, in the phosphor according to the fourth aspect, the fluorescence spectrum has a maximum in the vicinity of 490 to 495 nm.
According to a sixth aspect of the invention, in the phosphor according to the fourth or fifth aspect, the ultraviolet / near ultraviolet light is an ultraviolet / near ultraviolet light of 250 to 390 nm.
The invention according to claim 7 is characterized in that the phosphor according to any one of claims 1 to 6 is excited using an ultraviolet / near ultraviolet excitation light emitting element, and the fluorescence according to any one of claims 1 to 6 is provided. The invention according to claim 8 is characterized in that the body is excited using an electron beam excitation light emitting element.
The invention according to claim 9 is an invention of a white LED comprising the phosphor according to any one of claims 1 to 8. The invention according to claim 10 is an invention of a display device comprising the phosphor according to any one of claims 1 to 8, and the invention according to claim 11 is an invention according to claims 1 to 8. It is invention of the lighting fixture characterized by having the fluorescent substance of any one of these.

Hereinafter, the present invention will be described in detail.
The vanadium oxide referred to in the present invention has a composition formula A _x V _y O _z (wherein y is 1 and z is 2.9-3.1, x is 0.8-1.2, A Represents one or more selected from the group consisting of K, Rb, and Cs, and when y is 1 and z is 3.4 to 3.6, x is 0.9 to 1.1, A represents one or more selected from the group consisting of Ca, Sr, and Ba, and A may include one or more selected from the group consisting of Li, Na, NH ₄ , The amount of them is not particularly limited as long as the desired effect of the present invention is brought about.
The vanadium composition means a vanadium oxide having a vanadium atom, an oxygen atom, and an atom constituting A, and a composition ratio of these atoms satisfying the above numerical value in terms of an atomic equivalent ratio. Among these, particularly preferable vanadium oxides include AVO ₃ and A ₂ V ₂ O ₇ .

Among the above V oxides, a V oxide having the following crystal structure brings about a preferable effect. The crystal structure will be described with reference to FIG. 1. A VO ₄ tetrahedron is included in the structure, the VO ₄ tetrahedrons share a vertex to form a one-dimensional chain, and the one-dimensional chains are aligned to form a two-dimensional A layer is formed and has a crystal structure in which A ions are arranged between two-dimensional layers. This crystal structure is already known, and is also a crystal structure including a so-called VO ₄ tetrahedron. In addition, a and b in FIG. 1 indicate crystal axes. a and b are orthogonal or substantially orthogonal, the b-axis is perpendicular or substantially perpendicular to the layered structure, and the a-axis is parallel to the layer.
Among the above V oxides, V oxides having the following crystal structure also bring about a favorable effect. The crystal structure will be described with reference to FIG. 2. The VO ₄ tetrahedrons share a vertex to form a dimer, and the dimer is aligned and in a plane substantially perpendicular to the 111 crystal axis. A two-dimensional layer is formed, and has a crystal structure in which A ions are arranged between the two-dimensional layers. This crystal structure is already known, and is also a crystal structure including a so-called VO ₄ tetrahedron. In FIG. 2, [01-1] plane indicates a plane viewed from the 01-1 crystal axis direction.

  This crystal structure can be easily confirmed using a method for confirming a known crystal structure. For example, the crystal structure can be easily confirmed from the X-ray diffraction data of the manufactured V oxide.

The manufacturing method of the V oxide having this crystal structure can be manufactured by applying a known method.
For example, a carbonate A ₂ CO ₃ powder containing vanadium oxide V ₂ O ₅ powder and A ions has an A: V composition ratio of 1: 1 to 1.05: 1 (from an atomic equivalent ratio of 5 A. And weigh and grind and mix. The reason why A is increased to 5% is that the A component is easily sublimated during the firing process, and thus by increasing from the atomic equivalent ratio, it is easy to form a V oxide of A: V = 1: 1 (atomic equivalent ratio). is there. In the present invention, A: V is not limited to 1: 1 (atomic equivalent ratio).
A known method may be used as a means for pulverizing and mixing. For example, it is pulverized and mixed by a commonly used pulverizer such as a ball mill and a jet mill.
Next, the mixture is temporarily calcined at about 300 ° C. under atmospheric pressure, and then calcined at about 450 ° C. A known means may be adopted as the heating means. For example, a general electric furnace may be used. The temperature rising rate is desirably about 200 ° C./hour. If the rate of temperature increase is too fast, it may dissolve due to its own reaction heat, and if the rate of temperature increase is too slow, the production efficiency is poor and disadvantageous.
Another production method of the V oxide of the present invention different from the above is a method of precipitating from an aqueous solution.

The crystal structure of the V oxide referred to in the present invention includes the case where A in the layer composed of the VO ₄ tetrahedron is lost and the case where O is also slightly lost for charge compensation. The degree of A deficiency varies depending on the degree of influence caused by the manufacturing process of the V oxide, the operation when the phosphor is used, and the like, for example, even if deficient to the extent that the object of the present invention can be achieved. Good. The degree of O deficiency is also greatly affected by the degree of A deficiency, but may be deficient to the extent that the object of the present invention can be achieved.
The compositional formula of the V oxide having a crystal structure is represented by AVO ₃ , and because of the lack of A and O, A / V is 1 (atomic equivalent ratio) or less, and O / V is 3 (atomic (Equivalent ratio) or less, and within the range where the object of the present invention can be achieved.

The V oxide may be used as a phosphor as it is, but at least one or more of Mn ²⁺ , Sb ³⁺ , Bi ³⁺ and rare earth ions may be activated in the V oxide. The rare earth ions refer to ions of scandium group elements (excluding actinoids) and lanthanoid elements, and specifically include Pr ³⁺ , Ce ³⁺ , Eu ³⁺ , Eu ²⁺ , Sm ³⁺ , Tb ³⁺ , Yb ^{3+ and the} like.
The means for activating the V oxide is not particularly limited, and a known method may be adopted as appropriate. For example, there is a method in which a predetermined amount of a substance containing Mn ²⁺ , Sb ³⁺ , Bi ³⁺ , rare earth ions, and the like is weighed, mixed with the phosphor manufacturing raw material, and fired.

  The phosphor of the present invention has one major characteristic in that it has a fluorescence spectrum that is excited and broadly spreads in the visible light region, particularly showing white. In addition, the phosphor of the present invention is excited and emits white fluorescence broadly in the visible light region broadly spread in the range of 390 to 680 nm. Further, the fluorescence spectrum has a maximum in the vicinity of 490 to 495 nm, and emits white fluorescence that broadens in the range of 390 to 680 nm. The means to be excited is not particularly limited. For example, excitation means by ultraviolet / near ultraviolet light, for example, excitation means by ultraviolet / near ultraviolet light excitation at 250 to 390 nm is preferable. It can be excited by an ultraviolet / near ultraviolet LED that is an excitation light source of a white LED. Thus, the fact that the single substance of the present invention has a broad spectrum spread is epoch-making as compared with conventional phosphors.

Although the detailed light emission mechanism of the phosphor of the present invention is not yet clear, the charge transfer transition of (VO ₄ ) ^3- is considered to originate from the light emission. Further, when elemental analysis was performed on the synthesized AVO ₃ (A is Rb) by the inductively coupled plasma method (ICP method), Rb: V was approximately 1: 1 (atomic equivalent ratio). This also supports that the charge transfer transition of the (VO ₄ ) ³⁻ is more powerful than the formation of the color center due to the impurity level due to defects.

  The V oxide thus obtained is effective as a phosphor as it is, but a phosphor film can also be produced by applying a known method.

The phosphor of the present invention can be combined with a light emitting diode that emits ultraviolet / near ultraviolet light to produce a white diode (hereinafter sometimes referred to as white LED).
An example of the main part of the white LED will be described in more detail. The ultraviolet light emitting diode as a light source is covered with the phosphor of the present invention. The method and means for taking the structure covered with the phosphor are not particularly limited.
The ultraviolet / near-ultraviolet light emitted from the ultraviolet light emitting diode is incident on the phosphor and then absorbed in the phosphor, and the excited energy is emitted to the outside as white light. In the conventionally known white LED, white means that it looks white with human eyes. To the human eye, a mixture of the three primary colors of light and a mixture of two colors that are complementary colors appear white. In this case, it is slightly different from the white light realized by the continuous spectrum.
On the other hand, the white LED of the present invention is a type that produces white by emitting phosphors that emit light from blue to red under ultraviolet excitation, and can be said to be white light realized by a continuous spectrum.

  The phosphor of the present invention may be excited by an ultraviolet / near ultraviolet excitation light emitting element. Here, ultraviolet / near-ultraviolet excitation light-emitting elements are known, and any light-emitting element can be used in the present invention as long as the initial purpose can be achieved. Specifically, an optimal ultraviolet / near ultraviolet excitation light emitting element may be used as appropriate according to the performance of the phosphor and the purpose of use, and examples thereof include an organic EL element that emits ultraviolet light. It is not limited to an element.

  The phosphor of the present invention may be excited not only by ultraviolet / near-ultraviolet excitation but also by an electron beam excitation light emitting element. Here, the electron beam-excited light-emitting element is a known element, and any light-emitting element can be used in the present invention as long as the initial purpose can be achieved. Specifically, depending on the performance of the phosphor and the purpose of use, an optimal electron beam excitation light emitting element may be used as appropriate, and examples thereof include various emitters used for field emission displays, etc. It is not limited to the element.

The phosphor of the present invention has a fluorescence spectrum that is excited and broadly spreads in the visible light region, particularly showing white. In particular, the fluorescence spectrum emitted from the phosphor of the present invention by excitation light having an excitation spectrum in the range of 250 to 390 nm extends to 390 to 680 nm and emits white light. This fluorescence spectrum is an emission spectrum that is close to the spectrum of lighting fixtures currently used in the consumer and normal fluorescent lamps. Therefore, the phosphor of the present invention alone can be used as a phosphor for white LED, which is very convenient. Since the peak of the emission spectrum is in the range of 490 to 495 nm, the color temperature is high. Further, it is possible to combine with a phosphor having a strong light emission on the long wavelength side, and a warmer white color can be obtained. In addition, since it does not contain mercury or lead, there are few negative effects on the environment and human body.
Furthermore, most phosphors using ultraviolet LEDs or blue LEDs as excitation sources are 1300 ° C. or higher in air if they are oxides for synthesis, and 1600 ° C. under a high nitrogen pressure of about 10 atm if they are oxynitrides or nitrides. Often, high temperatures are required. On the other hand, since the phosphor of the present invention can be produced under mild conditions of about 450 ° C. at atmospheric pressure, it is advantageous in terms of simplicity of the production process and low production cost.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples. Regarding the data in the examples, X-ray diffraction was measured using an MXP21 diffractometer made by Mac Science, fluorescence and excitation spectrum measurements were made using Shimadzu Corporation RF5300PC spectrum meter, and composition analysis was performed using HORIBA JY138KH ULTRACE. I went.

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and rubidium carbonate Rb ₂ CO ₃ powder (rare metallic company) were mixed with a metal composition ratio of Rb: V from 1: 1 to Rb amount 5% higher than V. (Rb ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 0.7875 g), calcined at 300 ° C. for 6 hours, and then calcined at 450 ° C. for 24 hours to obtain a V oxide. The heat treatment is not pressurized unless otherwise specified (hereinafter the same). When this V oxide was subjected to composition analysis using the ICP method, a ratio of Rb: V = 0.99 (1): 1.00 (1) was obtained, and RbVO ₃ corresponding to the general formula of the present invention was formed. Confirmed that. The X-ray diffraction results for this RbVO ₃ are shown in FIG.
Further, when the obtained RbVO ₃ was excited with ultraviolet light of 250 to 390 nm, it had a maximum at 490 nm and showed white fluorescence having a broad emission spectrum in the range of 390 to 680 nm. (FIG. 4) “PL” in FIG. 3 means fluorescence, and “PLE” means excitation light (the same applies hereinafter).

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and potassium carbonate K ₂ CO ₃ powder (rare metallic company) were mixed in a metal composition ratio of K: V from 1: 1 to 5% more than the V amount of V. (K ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 1.3159 g), calcined at 300 ° C. for 6 hours, and then calcined at 450 ° C. for 24 hours to obtain a V oxide. The composition formula of the V oxide was found to be a KVO _3. The X-ray diffraction results for this KVO ₃ are shown in FIG.
Further, when the obtained KVO ₃ was excited with ultraviolet light of 250 to 390 nm, it showed white fluorescence having a maximum at 500 nm and a broad emission spectrum in the range of 390 to 680 nm. (Fig. 6)

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and cesium carbonate Cs ₂ CO ₃ powder (rare metallic company) were mixed at a metal composition ratio of Cs: V from 1: 1 to 5% higher than V by Cs. (Cs ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 0.5582 g), calcined at 300 ° C. for 6 hours, and then calcined at 450 ° C. for 24 hours to obtain a V oxide. The composition formula of this V oxide was found to be CsVO ₃ .
The X-ray diffraction results for this CsVO ₃ are shown in FIG. Further, when the obtained CsVO ₃ was excited by ultraviolet light of 250 to 390 nm, it had a maximum at 490 nm and showed white fluorescence having a broad emission spectrum in the range of 390 to 680 nm. (Fig. 8)

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and rubidium carbonate Rb ₂ CO ₃ powder (rare metallic company) were mixed with a metal composition ratio of Rb: V from 1: 1 to Rb amount 5% higher than V. (Rb ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 0.7875 g), 5 mol% (0.0631 g) of Sb ₂ O ₃ (Rare Metallic) is added and mixed, and calcined at 300 ° C. for 6 hours. And then calcined at 450 ° C. for 24 hours to obtain a V oxide. The composition formula of this V oxide was found to be RbVO ₃ . When this RbVO ₃ : Sb ₅ % was excited with an ultraviolet light of 250 to 390 nm, it showed white fluorescence having a maximum at 490 nm and a broad emission spectrum in the range of 390 to 680 nm (FIG. 9).

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and rubidium carbonate Rb ₂ CO ₃ powder (rare metallic company) were mixed with a metal composition ratio of Rb: V from 1: 1 to Rb amount 5% higher than V. (Rb ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 0.7875 g), 5 mol% (0.0249 g) of MnCO ₃ (rare metallic) was added and mixed, and calcined at 300 ° C. for 6 hours. Thereafter, firing was performed at 450 ° C. for 24 hours to obtain a V oxide. The composition formula of this V oxide was found to be RbVO ₃ : Mn 5%.
When this RbVO ₃ : Mn 5% was excited with ultraviolet light of 250 to 390 nm, it had a maximum at 502 nm and showed white fluorescence with a broad emission spectrum in the range of 390 to 680 nm. (Fig. 10)
(Comparative Example 1)

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and lithium carbonate Li ₂ CO ₃ powder (rare metallic company) were mixed with a metal composition ratio of Li: V from 1: 1 to 5% more than the amount of Li. (Li ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 2.4616 g), calcined at 400 ° C. for 6 hours, and then calcined at 500 ° C. for 24 hours to obtain a V oxide. The composition formula of this V oxide was found to be LiVO ₃ .
The X-ray diffraction results for this LiVO ₃ are shown in FIG. When the obtained LiVO ₃ was irradiated with ultraviolet light of 220 to 550 nm, very weak fluorescence was observed around 360 to 500 nm, but no luminescence that could be confirmed with the naked eye was obtained.
(Comparative Example 2)

Vanadium oxide V ₂ O ₅ powder (rare metallic company) and sodium carbonate Na ₂ CO ₃ powder (rare metallic company) were mixed with a metal composition ratio of Na: V from 1: 1 to 5% more Na than V. (Na ₂ CO ₃ : V ₂ O ₅ = 1.05 g: 1.7160 g), calcined at 400 ° C. for 6 hours, and then calcined at 500 ° C. for 24 hours to obtain a V oxide. The composition formula of this V oxide was found to be NaVO ₃ .
The X-ray diffraction results for this NaVO ₃ are shown in FIG. The obtained NaVO ₃ was irradiated with ultraviolet light of 220 to 550 nm, but only very weak fluorescence was observed in the vicinity of 400 to 500 nm, and strong light emission was not obtained.
(Comparative Example 3)

(NH ₄ ) VO ₃ (Johnson Massey) was irradiated with ultraviolet light of 220 to 550 nm, but only a very weak fluorescence was observed in the vicinity of 350 to 500 nm, and strong light emission was not obtained.

  The present invention is a phosphor exhibiting fluorescence over a wide range of 390 to 680 nm when excited by ultraviolet / near ultraviolet light in the vicinity of 250 to 390 nm. Therefore, it may be used as a white LED by an excitation light source such as an ultraviolet LED. In addition, application is also expected as a light emitting element using an organic EL that emits other ultraviolet rays, other ultraviolet light sources, an electron beam, or the like as an excitation source. Applications of the phosphor of the present invention include lighting devices such as daily lights that require white light, and display devices such as backlights used in various display devices.

It is a schematic diagram which shows a part of crystal structure of AVO ₃ It is a schematic view of a portion of the crystal structure of A ₂ V ₂ O _{7 2 is} an X-ray diffraction pattern of RbVO ₃ prepared in Example 1. FIG. The horizontal axis represents the diffraction angle, and the vertical axis represents the diffraction intensity (hereinafter the same). It is a diagram showing the emission spectrum when excited with ultraviolet light 250~390nm of RbVO ₃ prepared in Example 1. The horizontal axis represents wavelength, and the vertical axis represents light intensity (hereinafter the same). _{3 is} an X-ray diffraction pattern of KVO ₃ prepared in Example 2. FIG. Is a diagram showing the emission spectrum when excited with KVO ₃ prepared in Example 2 with ultraviolet light 250～390Nm. _{3 is} an X-ray diffraction pattern of CsVO ₃ prepared in Example 3. FIG. It is a diagram showing the emission spectrum when excited with ultraviolet light 250~390nm of CSVO ₃ prepared in Example 3. RbVO prepared in Example 4 _3: a diagram showing the emission spectrum when excited with ultraviolet light Sb5% of 250～390Nm. RbVO prepared in Example 5 _3: is a diagram showing the emission spectrum when excited with ultraviolet light Mn5% of 250～390Nm. _{2 is} an X-ray diffraction pattern of LiVO ₃ prepared in Comparative Example 1. FIG. _{3 is} an X-ray diffraction pattern of NaVO ₃ prepared in Comparative Example 2. FIG.

Claims (11)

In the composition formula _A x _V y _{O z} (wherein, y is 1, z is 3.4-3.6, with x is 0.9-1.1, A is selected from the group consisting of Ca, Sr, and Ba And a VO ₄ tetrahedron forming the composition formula A _x V _y O _z is a vertex. A vanadium oxide characterized in that it is a vanadium oxide having a crystal structure in which a dimer is formed in common and A ions are arranged between two-dimensional layers formed from the dimer. Phosphor to be used. The phosphor according to claim 1, wherein A may include one or more selected from the group consisting of Li, Na, and NH ₄ . 3. The phosphor according to claim 1, wherein the phosphor is activated by one or more selected from Mn ²⁺ , Sb ³⁺ , Bi ³⁺ , and rare earth ions. The phosphor according to any one of claims 1 to 3, wherein the phosphor emits white fluorescence that broadens in a range of 390 to 680 nm when excited by ultraviolet or near ultraviolet light. The phosphor according to claim 4, wherein the fluorescence spectrum has a maximum in the vicinity of 490 to 495 nm. 6. The phosphor according to claim 4, wherein the ultraviolet / near ultraviolet light is an ultraviolet / near ultraviolet light of 250 to 390 nm. The phosphor according to any one of claims 1 to 6, which is excited using an ultraviolet / near ultraviolet excitation light emitting element. It excites using an electron beam excitation light emitting element, The fluorescent substance of any one of Claims 1-6 characterized by the above-mentioned. A white LED comprising the phosphor according to claim 1. A display device comprising the phosphor according to claim 1. A lighting apparatus comprising the phosphor according to claim 1.