JP2000328054A - Phosphor - Google Patents

Abstract

(57) [Problem] To provide a phosphor which can be used as a substitute for a sulfide phosphor. The phosphor is a composite oxide of Sr and In SrIn ₂ O ₄
When the SrIn ₂ O ₄ is excited by an electron beam, the excitation energy causes Pr to emit light according to the energy level, for example, a red light having a wavelength of about 610 (nm). The light is emitted. Moreover, it is included in the phosphor
Al dissolves in SrIn ₂ O ₄ , for example, to reduce lattice defects existing in the solid solution, thereby further increasing the emission intensity. Therefore, it does not contain S, which significantly deteriorates the life of the display tube due to deterioration of the cathode, and also has harmful Cd
Although it is a non-sulfide phosphor (oxide phosphor) that does not contain any, it can obtain the same or higher luminance with the same chromaticity as (Zn, Cd) S: Ag, Cl, which is a similar red light-emitting phosphor it can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor, and more particularly, to a fluorescent display (Va) excited by a low-speed electron beam of 1 (kV) or less.
The present invention relates to an improvement in a phosphor that can be suitably used for a display device such as a cuum fluorescent display (VFD) or a field emission display (Field Emission Display: FED).

[0002]

2. Description of the Related Art For example, a display device of a type in which a phosphor is excited by a low-speed electron beam such as VFD or FED to emit light is inexpensive, has a long life, and has high luminance. ZnO: Zn phosphor is used. In addition, for the purpose of enabling multicolor display in combination with or instead of this phosphor, an oxide material such as a green-emitting ZnGa ₂ O ₄ : Mn phosphor,
Sulfide materials such as blue light-emitting ZnS: Zn and ZnS: Ag, green light-emitting ZnS: Cu, Al, and red light-emitting (Zn, Cd) S: Ag, Cl are also used.

[0003]

However, among the above phosphors, sulfide phosphors containing sulfide as a main component are:
For example, when used in a VFD, there is a problem that a life of only about 1000 (hours) can be obtained at most. V
The source of electrons that excite the phosphor in the FD is a filamentary cathode (cathode) suspended above the FD. The sulfide phosphor is easily decomposed by the collision energy of the electrons, and the sulfur (S) contained therein is decomposed. Adheres to the surface of the cathode to reduce its electron emission characteristics. For this reason, the sulfide phosphor itself has almost no change in characteristics and has a long life, but the life of the VFD is limited by the rate of deterioration of the cathode and is short. In addition, among the sulfide phosphors, phosphors that emit red light that are not realized with oxide phosphors include:
Contains toxic Cd. Therefore, if the phosphor is discarded in the process of manufacturing the phosphor, the process of manufacturing a product to which the phosphor such as VFD is applied, and the stage of discarding the product, it is not preferable in terms of environmental pollution and toxicity to the human body. There is also a problem.

Incidentally, as a non-sulfide phosphor, for example, Sn
Various phosphors such as O ₂ : Eu and Y ₂ O ₃ : Eu have been proposed, but none of them have low luminance and can be used as a substitute for the sulfide phosphor. Therefore, at present, only the sulfide phosphor is used in addition to the two oxide phosphors, and various types of red and the like, which are non-sulfide and cannot be realized by the two oxides, are used at present. There has been a demand for a phosphor having a luminescent color.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a phosphor which can be used in place of the above-mentioned sulfide phosphor.

[0006]

Means for Solving the Problems The gist of the phosphor of the present invention for achieving the above object is that a phosphor mainly contains a composite oxide of an alkaline earth metal and In, a rare earth element and a group 3 element. An element is contained as a subcomponent.

[0007]

According to the present invention, since the phosphor is composed mainly of a composite oxide of an alkaline earth metal and In and containing a rare earth element, the composite oxide is irradiated with an electron beam or the like. Is excited, the excitation energy causes the rare-earth element to emit light in a luminescent color corresponding to its type. However, since the rare-earth element further contains a group 3 element, the luminescence intensity is increased. Therefore, high luminance can be obtained while being a non-sulfide phosphor containing no S 2, so that the sulfide phosphor can be suitably substituted.

[0008]

In another embodiment of the present invention, preferably, the alkaline earth metal is one or more elements selected from Mg, Ca, Sr, and Ba.

[0009] Preferably, the rare earth element is Ce,
One or more elements selected from Pr, Sm, Eu, Tb, Ho, Er, and Tm.

[0010] Preferably, the rare earth element is added in the range of 0.05 to 5 (mol%) with respect to the main component. With this configuration, the addition amount of the rare earth element is sufficiently small with respect to the main component amount, and the luminance decrease due to concentration quenching is kept in a small range, so that sufficiently high luminance can be obtained. In addition, "concentration quenching" means that when the concentration of the rare earth element in the phosphor becomes higher than the optimum value, the rate at which light generated from the rare earth element is absorbed by the surrounding rare earth element itself and is not emitted to the outside. It refers to a phenomenon in which the luminance increases and the luminance decreases. In the case of the configuration of the present invention, the concentration of the rare earth element is less than 0.05 (mol%), the light emission amount of the rare earth element is small and the luminance is insufficient, but the concentration is 5 (mol%). When the value exceeds, the luminance becomes insufficient due to concentration quenching. More preferably, the amount of the rare earth element added is 0.4 (mol%) or less. If you do this,
Luminance reduction due to density quenching is further suppressed, and higher luminance can be obtained.

Preferably, the group 3 element is Al, G
a and one or more elements selected from Tl.

Preferably, the Group 3 element is added in a range of 0.5 to 40 (mol%) with respect to the main component. In this case, since the ratio of the Group 3 element is kept to a sufficiently small amount within a range where the addition effect can be obtained, a sufficiently high luminance can be obtained. In addition, 3
If the amount of the group element is less than 0.5 (mol%), the luminance cannot be sufficiently increased as compared with the case where the element is not contained. Conversely, if it exceeds 40 (mol%), a large amount of a compound of an alkaline earth metal and a Group 3 element that does not contribute to light emission will be present, so that the amount of excitation energy is reduced and the brightness is rather lowered. It will be. More preferably, the amount of the Group 3 element is in the range of 1 to 30 (mol%). In this case, higher luminance can be obtained.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a fluorescent substance according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a part of the fluorescent display tube 10 cut away.
is there. In the figure, a fluorescent display tube 10 has a predetermined light emitting pattern.
Phosphor layer 20 formed on the substrate_S, 20_D, 20_NDuplicate
Insulation of glass, ceramics, enamel, etc. provided in several places
A substrate 12 made of a body material and a glass
Pacer 14, transparent cover / glass plate 16, and plural
Anode terminal 18_P, A plurality of grid terminals 18_G, Caso
Lead terminal 18_K, And auxiliary grid terminal 18 _SGAnd
Board 12, spacer 14, and cover
-The glass plates 16 are mutually sealed by glass.
An airtight container is constructed and enclosed inside by those members.
An enclosed vacuum space is formed.

The display surface 19 of the fluorescent display tube 10 covered by the vacuum space of the substrate 12 has "8" in seven segments.
A plurality of phosphor layers 20 _S representing a character shape, one phosphor layer 20 _D representing a dot shape, one phosphor layer 20 _N representing a “1” character shape, and the like are arranged. Each of the phosphor layers 20 _S , 20 _D , and 20 _N is surrounded by a grid electrode 22 and an auxiliary grid electrode 24, respectively. Of the above-described phosphor layers 20 _S , 20 _D , and 20 _N , those having predetermined positions for each display digit are connected to the respective anode terminals 18 _P via the anode printed wiring 34 described later. Each of the grid electrodes 22 is connected to each of the grid terminals 18 _G via a grid wiring 26, and each of the auxiliary grid electrodes 24 is connected to each of the auxiliary grid terminals 18 _SG via an auxiliary grid wiring 28.

[0016] At both ends of the substrate 12, the cathode terminal 18 a pair of filament support frame 30 having a _K (shown only one located on the right side in the figure) are fixed respectively, which filament support Between the frames 30, a plurality of thin filaments (filament cathodes) 32 functioning as a direct heating type cathode (cathode) are parallel to the longitudinal direction of the
It is stretched so as to be at a predetermined height position separated from the second display surface 19. This filament 32 is, for example,
It is composed of a tungsten wire or the like whose surface is coated with an oxide solid solution of an alkaline earth metal having a low work function such as (Ba, Sr, Ca) O 2 as an electron emission layer.

FIG. 2 and FIG. 3 are views showing the configuration near the phosphor layer 20 _S having an “8” character shape, which is one of the display patterns provided on the display surface 19, and its cross-sectional structure.
The display surface 19 of the substrate 12, an anode for printed wiring 34 connected to the anode terminal 18 _P are formed by thick film screen printing method, an evaporation method, or the like, on its, and is formed to a predetermined thickness Thickness An insulator layer 38 appropriately provided with through holes 36 penetrating in the direction is fixed. This insulator layer 3
Numeral 8 is formed by a thick film screen printing method or the like, and is composed of a low-melting glass and a coloring pigment.

On the insulator layer 38, a phosphor layer 20 is formed.
A graphite layer 40 having a pattern similar to that of _S but having a slightly larger pattern is formed at a position where the graphite layer 40 is electrically connected to the anode printed wiring 34 via the through hole 36. This graphite layer 40 functions as an anode of the display tube 10. The phosphor layer 20 is formed, for example, by printing a thick-film phosphor paste on the graphite layer 40, and an acceleration voltage is applied through the graphite layer 40. The phosphor layer 20 has R
A phosphor corresponding to a predetermined emission color is appropriately selected from various phosphors of emission colors such as (red), G (green), and B (blue), and used.

Around the phosphor layer 20 _S , a rib-like wall 44 in contact with and surrounding the outer peripheral edge is provided upright in the direction from the graphite layer 40 toward the filament 32. The rib-like wall 44 is further surrounded by an auxiliary rib-like wall 46 erected on the insulator layer 38. The rib-like wall 44 and the auxiliary rib-like wall 4
6 is made of an inorganic filler such as low melting point glass and alumina, also has its upper end either have a height similar to each other is positioned above the fluorescent layer 20 _S.
The aforementioned grid electrode 22 and auxiliary grid electrode 24
Is a thick-film conductor mainly composed of a particulate conductive material such as graphite, silver, palladium, copper, aluminum, and nickel. The rib-like wall 44 and the auxiliary rib are formed by a thick-film screen printing method or the like. A predetermined thickness is provided on the top of the wall 46. The grid electrode 22 and the auxiliary grid electrode 24 are formed by the grid wiring 26 and the auxiliary grid wiring 28 formed on the insulator layer 38, and the grid pad 48 formed continuously from them.
The auxiliary grid pad 18 is connected to the grid terminal 18 _G and the auxiliary grid terminal 18 _SG via the auxiliary grid pad 50.

Returning to FIG. 1, at the left end of the fluorescent display tube 10 in the drawing, that is, at one end in the longitudinal direction, an exhaust pipe 52 made of cylindrical glass is provided. This exhaust pipe 52 is used in the manufacturing process of the fluorescent display tube 10.
Substrate 12, spacer 14, and cover glass plate 16
After being sealed with glass to form an airtight container, it is provided for the purpose of evacuating and vacuuming from the inside thereof,
The tip is blown off by a gas burner or the like after the end of evacuation.

When driving the fluorescent display tube 10 constructed as described above, an acceleration voltage is sequentially applied to each grid electrode 22 while a predetermined heat current is constantly flowing through the filament 32, and the filament 32 is synchronized with the acceleration voltage. A plurality of phosphor layers 20
_S, 20 _D, 20 an accelerating voltage to one of those to be lit among the _N is applied through the graphite layer 40. Thus, the thermoelectrons emitted from the filament 32 are accelerated by the grid electrode 22 to which the acceleration voltage is applied. Therefore, when the acceleration voltage is also applied to the phosphor layer 20 surrounded by the thermoelectrons, the thermoelectrons are generated. It collides and emits light. The grid electrode 22 is a control electrode for controlling the arrival of thermoelectrons to the phosphor layer 20, and the auxiliary grid electrode 24
Is for eliminating the influence of the negative electric field formed by the surrounding grid electrode 22 and for uniformly directing thermoelectrons to the phosphor layer 20. Note that the details of the driving method are not necessary for understanding the present embodiment, and thus are omitted.

By the way, in this embodiment, the above-mentioned phosphor layer 20 of any emission color is made of a non-sulfide phosphor. The blue-green light emitting phosphor layer 20 is, for example, ZnO:
The phosphor layer 20 for emitting green light is a Zn phosphor or the like.
The phosphor layer 20 is a Ga ₂ O ₄ : Mn phosphor or the like, and the red light emitting phosphor layer 20 is a SrIn ₂ O ₄ : Pr (Al) phosphor or the like, for example. That is, the red light-emitting phosphor is composed mainly of a composite oxide SrIn ₂ O ₄ having a perovskite structure of Sr and In, which are alkaline earth metals, and a rare earth element Pr acting as an activator on this,
In addition, Al which is a Group 3 (strictly, Group 3B) element that does not function as an activator but has a brightness improving action is included as a subcomponent. Therefore, a composite oxide of Sr and In
From being included Pr in SrIn ₂ O _4, when the SrIn ₂ O ₄ is excited by the electron beam (thermionic) at its excitation energy
Pr is an emission color corresponding to the energy level, for example, wavelength 610
It emits red light of about (nm). At this time, since the Al contained in the phosphor is dissolved in SrIn ₂ O ₄ and the like, lattice defects existing in the phosphor are reduced, so that the emission intensity is further increased. Therefore, although it is a non-sulfide phosphor (oxide phosphor) that does not contain S and does not contain harmful Cd, which deteriorates the life of the display tube 10 because the cathode 32 is deteriorated, the same red light emission fluorescence is obtained. Body (Z
n, Cd) S: The same or higher luminance can be obtained with the same chromaticity as Ag, Cl.

The SrIn ₂ O ₄ : Pr (Al) phosphor is manufactured, for example, as follows. That is, first, in the weighing step S1, a predetermined amount of a raw material serving as an Sr source, a raw material serving as an In source, a raw material serving as a Pr source, and a raw material serving as an Al source are weighed. As the starting material, an appropriate one is used.For example, SrCO ₃ is used as an Sr source, and
In ₂ O ₃ , PrCl ₃ as Pr source, and Al ₂ O as Al source
₃ etc. can be used. In addition, PrCl ₃ and Al ₂ O ₃
Means that the ratio to SrIn ₂ O ₄ after synthesis is 0.1 (mol
%) And about 3 (mol%). Next, in the mixing step S2, the weighed raw materials are put into a mixing stirrer or the like, and are sufficiently mixed. In the subsequent firing step (reaction step) S3, the mixed raw material powder is filled in an alumina crucible or the like and fired in an electric furnace. The firing conditions are appropriately determined according to the composition of the starting materials, the composition of the phosphor to be generated, and the like.For example, 1000 to 1400 in an oxidizing atmosphere.
It is appropriate to bake at about (° C) and about 1 to 9 (hours). Thereby, the SrIn ₂ O ₄ : Pr (Al) phosphor is synthesized.
Thereafter, in a pulverizing step S4, the product can be pulverized to an appropriate roughness in an alumina mortar or the like to obtain a powdered phosphor.

Although the SrIn ₂ O ₄ : Pr (Al) phosphor has some conductivity, it has insufficient conductivity as a phosphor of the display tube 10. Therefore, when forming the phosphor layer 20 using this phosphor powder, for example, a finer powder of In ₂ O ₃ or the like is mixed with the phosphor powder as a conductive treatment material. The necessary mixing amount is appropriately determined according to the particle size ratio, the composition of the phosphor, etc., for example, 12 (wt%)
The degree is appropriate. The mixture is mixed with an appropriate vehicle to form a paste, applied to the graphite layer 40 by a thick film screen printing method or the like, and then dried and fired to form the phosphor layer 20. The drying is suitably performed at, for example, about 120 (° C.) and about 30 (minutes), and the firing is performed at a temperature of about 500 (° C.).

The mixing amount of PrCl ₃ and Al ₂ O ₃ is determined based on, for example, the following experiment. First, the results of an experiment in which the latter addition amount is studied will be described. Table 1 below shows the mixing ratio. In this example, the amount of Pr added (converted value) was set to a constant value of about 0.3 (mol%),
Was changed in the range of 1 to 40 (mol%). In the table, "Pr addition amount" and "Al addition amount" in the two columns on the left are derived by calculation of the molar ratio to SrIn ₂ O ₄ to be synthesized. ). That is, the ratio of Sr to In is constant, and SrCO ₃ , In ₂ O ₃ , and PrCl ₃ are No. 1 to No. 7,
The mixing ratio was the same. FIG. 4 shows an XRD (X-ray diffraction) pattern of the phosphor powder of No. 2 among the phosphor powders generated in each of the preparations. From the XRD pattern shown in the figure, SrIn
It was confirmed that ₂ O ₄ was synthesized. The XRD pattern is substantially the same, although illustration is omitted for other formulation compositions.

[Table 1] N0. | Pr addition amount Al addition amount | SrCO ₃ In ₂ O ₃ PrCl ₃ Al ₂ O ₃₁ | 0.3 (mol%) 1 (mol%) | 1.936 (g) 3.641 (g) 0.01 (g) 0.007 (g) 2 ↑ ↑ 3 ↑ ↑ ↑ 0.020 3 ｜ ↑ 5 ↑ ↑ ↑ 0.033 4 ↑ ↑ 7 ↑ ↑ ↑ 0.047 5 ↑ 10 ↑ ↑ ↑ 0.067 6 ↑ ↑ 20 ↑ 44 ↑ 0.144 7 ｜ ↑ 40 ｜ ↑ ↑ 88 0.288

FIG. 5 shows the relative luminance of each composition described above in relation to the amount of Al added. The brightness of the phosphor is determined by preparing the display tube 10 shown in FIG.
Light emission was performed under the same driving conditions with an applied voltage of 0 (V) being 30 (V), and measurement was performed using, for example, a color luminance meter manufactured by Topcon Corporation. The relative luminance 100 (%) in the figure is the practical luminance required for the display tube 10, in other words, if it has a relative luminance of 100 (%) or more, it is preferably used as the phosphor of the display tube 10. be able to. As shown in the figure,
In the range of 0.5 (mol%) to 41 (mol%), the relative luminance becomes 100 (%) or more, which indicates that the relative luminance is appropriate for the phosphor layer 20 of the display tube 10. When the amount of Al added is in the range of 1.2 to 28 (mol%),
Although the relative luminance is further increased to 150 (%) or more, the luminance tends to gradually decrease with the addition amount of 10 (mol%) or more. This decrease in luminance is presumed to be due to the fact that a compound of Sr and Al was generated due to excessive addition of Al and the proportion of the main component to be excited was reduced. For this reason, the peak of the brightness is 3 (mol
%), This value was adopted as the optimum value in this embodiment.

Table 2 below shows a formulation in which the amount of Pr added was examined. In this blending experiment,
The amount of Al added was set to a constant value of about 3 (mol%), which was optimal in Table 1, and SrCO ₃ ,
In ₂ O ₃ was also used as a constant amount as in Table 1. Also in the preparation of this example, when the crystals were analyzed by the X-ray diffraction method,
Although not shown, XRD patterns similar to those in Table 1 were obtained. That is, in any of the following formulations
SrIn ₂ O ₄ is synthesized.

[0029] [Table 2] N0 |. Pr amount Al amount _{| SrCO 3 In 2 O 3 PrCl} 3 Al 2 O 3 8 | 0.05 (mol%) 3 (mol%) | 1.936 (g) 3.641 (g) 0.001 (g) 0.020 (g) 9 0.1 0.1 ↑ ↑ ↑ 0.003 ｜ 10 0.2 0.2 ↑ ↑ ↑ 0.006 ↑ 11 0.5 0.5 ↑ ↑ ↑ 0.016 ↑ 12 1 1 ｜ ↑ ↑ 0.032 ↑ 13 2 2 ｜ ↑ ↑ 0.064 ↑ 14 ｜ 5 ｜ ↑ ↑ 60 0.160

FIG. 6 shows the result of measuring the luminance of the display tube 10 by forming the phosphor layer 20 using the phosphors synthesized by the above-mentioned Nos. 8 to 14, and plotting the amount of Pr added. It is expressed for the axis. As shown in the figure, in the range where the amount of Pr added is 0.1 (mol%) or less, the luminance increases as the amount of addition increases, but when the amount exceeds 0.1 (mol%), the luminance sharply decreases, and the luminance decreases 0.5 (mol%). ) In the above range, the brightness tends to gradually decrease. For this reason, in the range of about 0.05 (mol%) to 4.25 (mol%), a relative luminance of 100 (%) or more can be obtained.
In particular, it can be seen that in the range of 0.05 to 0.4 (mol%), a higher luminance of 150 (%) or more is obtained. From this experimental result, in the present embodiment, the optimal addition amount of Pr is 0.1 (mo
l%). FIG. 7 shows an emission spectrum in the case of the optimum composition determined in this way, that is, the composition of the example used for the display tube 10 of FIG. The peak of the spectrum of this composition is at about 610 (nm), and the color coordinates are x = 0.624 and y = 0.000 on the CIE chromaticity diagram.
324. That is, a conventional red light-emitting phosphor (Z
The color coordinates of n, Cd) S: Ag, Cl were almost the same as x = 0.620 and y = 0.378, and it was confirmed that the chromaticity was the same. Also,
The emission luminance is also about the same as this sulfide phosphor, and has sufficiently high luminance, so that it can be sufficiently used as a substitute phosphor.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above-described embodiment, an example in which Sr is used as the alkaline earth metal has been described. However, when other alkaline earth metals such as Mg, Ca, and Ba are used, the same applies. A high-performance phosphor can be obtained. Also,
One alkaline earth metal may be used alone, or two or more alkaline earth metals may be used in combination. The composition of the phosphor is appropriately changed according to the type of element used.
That is, the optimum values of the constituent elements shown in the above-described embodiments are limited to the case of the compositions shown in the embodiments, and there are different optimum values for the main component (base) and the sub-component compositions. .

In the embodiment, the case where Pr is used as a rare earth element has been described. However, Ce, Sm, E
Even if other rare earth elements such as u, Tb, Ho, Er, and Tm are used, a phosphor with high luminance and long life can be obtained similarly. These rare earth elements determine the emission wavelength and emission color of the phosphor of the present invention, and a desired emission color can be obtained by selecting an arbitrary element. When two or more kinds of elements are used at the same time, a phosphor having a wide emission wavelength can be obtained by appropriately setting the mixing ratio.

Further, in the examples, as the group 3 element
Although the case where Al is used has been described, the luminance of the phosphor can be similarly increased by using other Group 3 elements, such as Ga, Tl, and In. As for the Group 3 element, two or more kinds may be simultaneously mixed. Note that the composition of the phosphor is appropriately changed depending on the types of the rare earth element and the group 3 element.

In the embodiments, the powdered phosphor of the present invention is used to form the phosphor layer 20 of the fluorescent display tube 10. However, various kinds of display devices including a phosphor layer such as an FED and the like can be used. The powder phosphor of the present invention can be similarly used for a fluorescent tube and the like.

The phosphor of the present invention is, for example, 250 to 350.
Since it can be excited even by ultraviolet light having a wavelength of about (nm), it can be suitably used for a gas discharge panel or the like in which a phosphor is excited by ultraviolet light.

Although not specifically exemplified, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a fluorescent display tube in which a powdered phosphor of one embodiment of the present invention is used for a phosphor layer.

FIG. 2 is an enlarged view showing a light emitting pattern provided on a display surface of the fluorescent display tube of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a diagram showing an example of an XRD pattern of a phosphor according to one embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a blended composition of a phosphor of one embodiment of the present invention and relative luminance.

FIG. 6 is a diagram showing a relationship between a blended composition of a phosphor of one embodiment of the present invention and relative luminance.

FIG. 7 is a diagram showing an emission spectrum of a phosphor of an example of the present invention.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Noriyoshi Shibata Inventor 2-4-1 Rokuno, Atsuta-ku, Nagoya-shi, Aichi F-Term in the Fine Ceramics Center 4H001 XA08 XA12 XA13 XA20 XA31 XA38 XA49 XA56 XA81 YA58 YA59 YA62 YA63 YA65 YA67 YA68 YA69 5C036 EE01 EE19 EF02 EF05 EG36 EH12

Claims (6)

[Claims] 1. A phosphor comprising a composite oxide of an alkaline earth metal and indium (In) as a main component and a rare earth element and a Group 3 element as subcomponents. 2. The fluorescence according to claim 1, wherein the alkaline earth metal is one or more elements selected from magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba). body. 3. The rare earth element includes cerium (Ce), praseodymium (Pr), samarium (Sm), eurobium (Eu), terbium (Tb), holmium (Ho), erbium (Er), and thulium (Tm). The phosphor according to claim 1, wherein the phosphor is one or more elements selected from the group consisting of: 4. The rare earth element is based on the main component.
2. The phosphor according to claim 1, which is contained in a range of 0.05 to 5 (mol%). 5. The group 3 element is aluminum (Al),
2. The phosphor according to claim 1, wherein the phosphor is one or more elements selected from gallium (Ga) and thallium (Tl). 6. The group 3 element is present in an amount of 0.1 to the main component.
2. The phosphor according to claim 1, which is contained in a range of 5 to 40 (mol%).