KR101457056B1 - Electroluminescence panel and method for the production thereof using sintered ceramic phosphor sheet - Google Patents

Abstract

Disclosed is an electroluminescent panel using a sintered ceramic fluorescent sheet including a fluorescent layer made of a ceramic fluorescent sheet sintered with a phosphor powder and a method of manufacturing the same. The electroluminescent panel using the sintered ceramic fluorescent sheet can be produced by dispersing the conventional phosphor powder in an organic binder or by using a thin film fluorescent film by a conventional vacuum deposition technique, A dielectric layer or an electrode layer is formed on the upper and lower surfaces of the ceramic fluorescent sheet sintered at a high density by heat treatment. Thereby improving the thermal durability, thereby prolonging the luminescent lifetime and providing reliability of the luminescent color. In addition, it can provide various colors ranging from ultraviolet light emission to white light emission, and can be used for a light source of an exposure machine, a sterilizing device, a light source of a display device, a lighting device and the like.

Fluorescent sheet, dielectric sheet, bend

Description

[0001] The present invention relates to an electroluminescence panel using a sintered ceramic fluorescent sheet and a method of manufacturing the same,

1 is a schematic view of an electroluminescent panel according to the present invention.

2 is a schematic view of another electroluminescent panel according to the present invention.

FIG. 3 is a photoluminescence spectrum of ZnGa ₂ O _4. FIG. 3 is a near-ultraviolet region emission spectrum. FIG.

FIG. 4 is a photoluminescence spectrum of Zn ₂ (Si, Ge) O ₄ : Mn ²⁺ .

5 is a photoluminescence spectrum of ZnGa ₂ O ₄ : Mn ²⁺ , which shows the spectrum of a green luminescent region.

The present invention relates to an electroluminescent device. And more particularly, to an electroluminescent panel used in a sterilizing apparatus, a light source of an exposure apparatus, various display apparatuses, and a lighting apparatus.

An electroluminescent device is an active type solid-state display device which emits light by a phenomenon in which a material emits light when an electric field is applied, that is, electroluminescence (hereinafter, referred to as 'EL'). After being discovered by OW Destriau in 1936, And has been actively applied to specific fields such as illumination and backlighting light sources because of its fast response speed, wide viewing angle, ease of manufacture, and large area.

The AC driven inorganic electroluminescent element is a surface light emitting element that uniformly emits light having a large area within 5% of the light emitting surface. In particular, the consumption current is about 0.1 mA / cm ^2, and the power consumption is as low as 10 mW / cm ² and is used as a backlight of a liquid crystal information display window of a mobile communication terminal such as a mobile phone PDA and an MP3 player. On the other hand, EL luminescence has been steadily expanding its market to various product advertisements and information display boards by taking advantage of the advantages of surface light emission. Globally, EL sheet is created on the fabric of the shop advertisement to replace the current fluorescent light and neon sign light source, and low power large area EL TV is also under development.

Conventionally, a thick film type inorganic electroluminescent device is formed by coating ITO (InO + SnO) with a first electrode layer on a transparent glass substrate, and forming a phosphor layer on the first electrode layer. In this phosphor layer, a mixed paste was prepared by mixing phosphor powder (light emitting powder or phosphor) of each of R, G and B and an organic binding resin (Resin) and dispersed and applied by a screen printing technique to a thickness of 50 to 150 μm . A dielectric layer which is mixed with the organic binder resin in an appropriate ratio on the phosphor layer and applied by a screen printing technique, a second electrode layer composed of aluminum paste, and a protective layer for protecting the second electrode layer are formed in this order.

 Such a constitutional structure of the device is structurally limited to extend the lifetime of the device due to insulation breakdown due to collision of electrons with the dielectric layer and the electrode layer when inducing light emission of the phosphor layer by applying an electric field to the device. Also, the luminance is low due to total internal reflection between thin films.

The organic bonding resin mixed with the phosphor by the heat generated when the device is driven is thermally unstable, and the organic bonding resin is degenerated or evaporated when the device is driven, so that pinholes are formed in the respective constituent layers mixed with the organic bonding resin, The adhesion of the fluorescent layer to the dielectric layer and the electrode layer is so low that the supply of electrons to the luminescent center of the phosphor is irregular and thereby the reliability of the inorganic electroluminescent device is lowered so that the application field thereof is gradually reduced In fact.

In order to solve the problems of the prior art, the present invention uses a ceramic fluorescent sheet that is sintered at a high density as a fluorescent layer of an electroluminescent panel, so that electrons can be smoothly supplied to the luminescent center of the fluorescent layer, And an object of the present invention is to provide an electroluminescent panel using the fluorescent sheet and a method of manufacturing the same.

To achieve the above object, an electroluminescent panel using the sintered ceramic fluorescent sheet of the present invention includes a fluorescent layer made of a ceramic fluorescent sheet sintered with a phosphor powder.

At this time, (Zn, Mg) (Ga , Al) 2 O 4, (Y, Ga) 2 O 3, Zn 2 (Si, Ge) O 4, Zn (S, O), (Mg, Ca, Sr, Ba ) S, (Mg, Ca, Sr, Ba) Al 2 S 4, (Y, Gd) 5 (Ga, Al) 5 O 12, (Mg, Ca, Sr, Ba) Ga 2 S 4, (Al, Ga ) N, (Ca, Sr, Ba) (Ga, Al) 2 O 4, (Ca, Sr, Ba) 3 Ga 2 O 6, (Mg, Ca, Sr, Ba) (Al, Y) 2 S 4, (Ca, Sr, Ba) ₂ (Zn, Mg) S ₃ .

Preferably, as a flux, and the phosphor powder, _{NaCl, NH 4 Cl, H 3} BO 3, B 2 O 3, LiF, Cu (C 2 H 3 O 2) 2 · H 2 O GeO 2, SiO 2, SnO 2 , AlN, GaN, Al ₂ O _3, Ga ₂ O ₃ , and In ₂ O ₃ are added.

Preferably, the fluorescent sheet is formed of a phosphor powder that emits near-ultraviolet light and is used as a light source for sterilizing or exposing light, or a phosphor powder for emitting white light, and is used as a back light source or a lighting device of a display element.

Preferably, the fluorescent sheet emits near-ultraviolet light or blue light, and a wavelength converting fluorescent film having strong absorption in each light emitting region is formed on the upper surface of the fluorescent sheet. The fluorescent film for the wavelength _{conversion, Y 3 Al 5 O 12:} Ce, Tb 3 Al 5 O 12: Ce, (Ba, Sr, Ca) 2 SiO 4: Eu, (Ba, Sr, Ca, Zn) S: Eu, and (Ba, Sr, Ca) AlON: Eu.

Preferably, the ceramic dielectric sheet sintered with the dielectric powder is thermally cemented on the fluorescent sheet.

Preferably, the fluorescent sheet is formed into a waveform.

Further, the method of manufacturing an electroluminescent panel of the present invention includes: forming a solid fluorescent sheet by pressurizing and heat-treating a phosphor powder; Forming a dielectric layer on the upper surface of the fluorescent sheet; Forming a first electrode on the dielectric layer; And forming a second electrode on the lower surface of the fluorescent sheet.

Preferably, the dielectric layer is formed by thermally adhering a ceramic dielectric sheet sintered with a dielectric powder on the upper surface of the fluorescent sheet.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the drawings.

The electroluminescent panel of the present invention can be applied to the electroluminescent panel using a solid phase fluorescent sheet prepared by pressing a phosphor powder into a sheet form as a substrate instead of a conventional glass or polymer substrate, A dielectric layer or an electrode layer is formed on the upper and lower surfaces of the sheet. Hereinafter, a method for forming a fluorescent sheet, a dielectric layer, and an electrode layer constituting the present invention will be described separately.

1. Manufacturing Method of Sintered Ceramic Fluorescent Sheet

First, the phosphor powder constituting the fluorescent sheet of the present invention can be applied to all the conventional phosphors used in the inorganic EL.

(Zn, Mg) (Ga, Al) ₂ O ₄ , (Y, Ga) ₂ O ₃ , and Zn ₂ (Si, Ge) are used as the fluorescent matrix, _{O 4, Zn (S, O} ), (Mg, Ca, Sr, Ba) S, (Mg, Ca, Sr, Ba) Al 2 S 4, (Y, Gd) 5 (Ga, Al) 5 O 12, (Mg, Ca, Sr, Ba ) Ga 2 S 4, (Al, Ga) N, (Ca, Sr, Ba) (Ga, Al) 2 O 4, (Ca, Sr, Ba) 3 Ga 2 O 6, (Mg, Ca, Sr, Ba ) (Al, Y) 2 S 4, (Ca, Sr, Ba) 2 (Zn, Mg) and the like S _3, as an active agent Tm, Ce, Mn, Tb, Eu May be used alone or in combination according to the intended use. The fluorescent matrix constituting the fluorescent sheet of the present invention, the activator thereof, and the luminescent characteristics of the fluorescent matrix of the present invention are summarized below.

Composition and Emission Color of Phosphor Powder Fluorescent matrix Activator Luminous color (Zn, Mg) (Ga, Al) ₂ O ₄ No addition (oxidation synthesis) blue No addition (reduction synthesis) Near-ultraviolet Mn2 + green (Y, Ga) ₂ O ₃ Mn2 + green Eu3 + Red Zn ₂ (Si, Ge) O ₄ Mn2 + green ZnO Zn green Tm blue Tb green Mn green ZnS Ce3 + blue Mn2 + green Tb3 + green Eu2 + Green - Red (Mg, Ca, Sr, Ba) S Ce3 + blue Mn2 + green Tb3 + green Eu2 + Green - Red (Mg, Ca, Sr, Ba) Al ₂ S ₄ Eu2 + blue _{(Y, Gd) 5 (Ga} , Al) 5 O 12 Ce3 + blue (Mg, Ca, Sr, Ba) Ga ₂ S ₄ Ce3 + blue (Al, Ga) N Tb3 + green Eu3 + Red (Ca, Sr, Ba) (Al, Ga) ₂ O ₄ Mn2 + green Eu3 + Red (Ca, Sr, Ba) ₃ Ga ₂ O ₆ Mn2 + green (Mg, Ca, Sr, Ba) (Al, Y) ₂ S ₄ Mn2 + Red Eu2 + Red (Ca, Sr, Ba) ₂ (Zn, Mg) S ₃ Mn2 + Red Eu2 + Red

For example, the electroluminescent panel of the present invention can be used as a light source for sterilizing or disposing of a phosphor powder (for example, ZnGa ₂ O ₄ when no activator is added) that emits light in a near ultraviolet to blue region of 350 nm to 410 nm In the case of using a phosphor powder emitting white light (for example, SrGa ₂ S ₄ : Ce ₃ ⁺ (Blue) + ZnSiO ₄ : Mn ₂ ⁺ (Green) + CaGa ₂ O ₄ : Eu ₃ ⁺ (red) As a backlight of a display device.

The phosphor powders can be prepared by mixing powder of uniform size through a ball mill and separating only particles of a predetermined size through a sieve in order to obtain a more uniform mixed powder.

Thereafter, the mixed powder is subjected to pressure molding to form a solid sheet, and then heat-treated in a heat-resistant crucible at 1100 to 1500 ° C for 1 to 4 hours to produce a solid-phase fluorescent sheet. If the temperature is lower than 1100 ° C, crystallization is not performed. If the temperature is higher than 1500 ° C, the composition element is volatilized. It goes without saying that the pressurization and the heat treatment process can be performed at the same time.

The phosphor powder, a flux, _{NaCl, NH 4 Cl, H 3} BO 3, B 2 O 3, LiF, Cu (C 2 H 3 O 2) 2 · H 2 O GeO 2, SiO 2, SnO 2, AlN, GaN , Al ₂ O _3, Ga ₂ O ₃ , In ₂ O _3, or the like alone or in combination, it is possible to improve the reactivity as well as the strength and durability of the fluorescent sheet.

The thus-prepared fluorescent sheet can be polished with a polishing cloth such as Al ₂ O ₃ and its thickness can be adjusted, so that both the thin film and the thick film can be obtained. If the thickness of the fluorescent sheet is less than 0.5 占 퐉, there is a large risk that the element will be destroyed due to application of an excessive electric field to the fluorescent sheet. If the thickness is more than 160 占 퐉, an appropriate electric field can not be applied to the fluorescent sheet, Mu] m.

On the other hand, another fluorescent film can be formed on the fluorescent sheet. In this case, the fluorescent sheet uses a fluorescent powder capable of emitting near-ultraviolet light or blue light, and another fluorescent film uses a fluorescent substance powder for wavelength conversion. Ultraviolet light or blue light emission of the wavelength converting phosphor excites the phosphor of the wavelength converting fluorescent film to change the wavelength.

The fluorescent film for wavelength conversion is composed of Y ₃ Al ₅ O ₁₂ : Ce, Tb ₃ Al ₅ O ₁₂ : Ce, (Ba, Sr, Ca) ₂ SiO ₄ : Eu, (Ba, Sr, Ca, (Ba, Sr, Ca) AlON: Eu.

The absorption maximum wavelength range and the maximum emission wavelength of the phosphor constituting the wavelength converting fluorescent film are shown in the following table.

Characteristics of phosphor constituting fluorescent film for wavelength conversion Phosphor Absorption maximum wavelength region Emission peak wave device Y ₃ Al ₅ O ₁₂ : Ce 430 - 470 nm 560 nm Tb ₃ Al ₅ O ₁₂ : Ce 430 - 470 nm 560 nm _{(Ba, Sr, Ca) 2} SiO 4: Eu 360 - 450 nm 510 -580 nm (Ba, Sr, Ca, Zn) S: Eu 360 - 450 nm 510 -580 nm (Ba, Sr, Ca) AlON: Eu 360 - 450 nm 510 -580 nm

For example, ZnGa ₂ O ₄ produced in an oxidizing atmosphere without the addition of an activator emits blue light at 450 nm. The phosphor for wavelength conversion, which emits yellow light, is dispersed in an epoxy resin or the like on a fluorescent sheet made of the phosphor, When coating, the white color can be realized by mixing the blue color of the fluorescent sheet and the yellow color of the fluorescent film for wavelength conversion.

In addition to forming the fluorescent sheet flat as shown in FIG. 1, the fluorescent sheet may be formed with a curved portion as shown in FIG. 2, so that the dielectric layer and the electrode layer may also be bent. Such a bent portion increases the light emitting area and prevents a reduction in luminance caused by total internal reflection, thereby greatly improving the luminance.

The bent portion may be formed during the pressure molding of the fluorescent sheet, or may be formed through a photolithography technique. In the case where the curved portion is a waveform, the smaller the period is, the more the average luminance will increase due to the increase of the light emitting area.

2. Method of forming dielectric layer

Prior to the formation of the dielectric layer, the dielectric material is heat treated in an oxygen atmosphere and powdered. For example, BaTiO ₃ is sintered at 1400 ° C for 12 hours in an oxygen atmosphere.

Thereafter, the dielectric layer can be directly formed on the fluorescent sheet by vacuum deposition or screen printing.

In addition to such a dielectric layer forming method, a method of forming a dielectric sheet and then thermally cementing it on a fluorescent sheet may be used. Specifically, the dielectric sheet is formed by pressing a dielectric powder with a mold having the same size and shape as the fluorescent sheet to form a solid sheet, and then heat-treating the sheet at 1000 to 1500 ° C. for 1 to 2 hours. Of course, the pressurizing process and the heat treatment process may be performed at the same time. The dielectric sheet thus produced is thermally bonded on the fluorescent sheet to form a dielectric layer.

At this time, the surface of the dielectric sheet is preferably polished with an abrasive to have a thickness of 0.3 to 80 탆. If the thickness is less than 0.3 탆, there is a risk that the element is broken due to application of an excessive electric field to the fluorescent sheet. If the thickness exceeds 80 탆, an appropriate electric field can not be applied to the fluorescent sheet.

3. Method of forming electrode layer

On the dielectric layer, aluminum or silver excellent in electric conductivity and excellent in reflectance is vacuum-deposited to form a rear electrode layer. An oxidation protection layer may be additionally formed on the back electrode layer to protect the back electrode layer.

On the other hand, a transparent electrode layer is formed on the other top surface of the fluorescent sheet by vacuum depositing a material having excellent transmittance and electrical conductivity for visible light such as ITO (In ₂ O ₃ + SnO ₂ ) and then heat-treating to complete the fabrication of the electroluminescent panel do.

Hereinafter, the operation and effect of the present invention will be described in detail by way of examples.

Example 1

(ZnGa ₂ O ₄  An electroluminescent panel using a fluorescent sheet)

The mixture of zinc oxide (ZnO) and gallium oxide (Ga ₂ O ₃ ) in a weight ratio of 10% of the total weight of the phosphors was put into a vessel at a ratio of 1: 1, H ₃ BO _{3 was} selected as a fusion agent, And pulverized. The pulverized mixture was heat-treated at 1100 캜 for 12 hours in a heating furnace in a reducing atmosphere with a hydrogen mixed gas to synthesize a ZnGa ₂ O ₄ phosphor emitting near ultraviolet and blue visible light. Thereafter, a phosphor powder having a particle size of 10 mu m was separated through a sheave to obtain a more uniform powder.

The obtained phosphor powder was subjected to specific heat treatment at a pressure of 10 ton / m 2 to obtain a solid sheet having a flat surface. Heat treatment was performed at 1300 ° C for 12 hours in a heat resistant crucible in a reducing atmosphere to minimize inter- And the compactness of the fluorescent sheet was increased to produce a solid fluorescent sheet having improved electrical characteristics.

The size and shape of the fluorescent sheet produced through the above process are determined according to the size and shape of the mold used in the non-heat treatment press molding, and the thickness thereof is determined according to the total mass of the mixed phosphors. The fluorescent sheet prepared in this example had a diameter of 12 mm, and when the total mass of the mixed phosphor was 150 mg, a thickness of 250 탆 was initially prepared. Thereafter, the substrate was polished with an Al ₂ O ₃ polishing cloth to adjust the thickness of the fluorescent sheet to 100 μm.

Next, the dielectric layer was selected as BaTiO ₃ , sintered in an oxygen atmosphere at 1400 ° C for 12 hours to prepare a powder, press-molded into a mold having the same size and shape as the fluorescent sheet, sintered at 1200 ° C for 2 hours, A dielectric sheet was prepared in advance and then polished with an Al ₂ O ₃ polishing cloth to prepare a dielectric sheet having a thickness of 40 μm.

Next, after the match by using the mold the adhesive side of the dielectric sheet onto the fluorescent sheet at room temperature, the ratio was raised in pressure up to 900 ℃, 900 ℃ in an oxidizing atmosphere, applying a pressure of 1 ton / m ² fluorescence sheet And a dielectric sheet.

Next, a back electrode layer having a thickness of 30 nm is formed on the dielectric sheet by vacuum vapor deposition of aluminum having an excellent electrical conductivity and a reflectance of 90% or more, and an oxidation protection layer for protecting the back electrode layer is additionally formed on the back electrode layer Respectively. ITO (In ₂ O ₃ + Sn ₂ O ₄ ), which is a material with excellent transmittance and electrical conductivity for visible light, is vacuum deposited on a fluorescent sheet to a thickness of 50 nm and vacuum deposited. An electrode layer was formed to fabricate an electroluminescent panel as shown in Fig.

 The electroluminescent panel manufactured as described above was driven at a voltage of 200 V and a frequency of 400 Hz by using an AC power supply. As a result, as shown in the emission spectrum of FIG. 3, the maximum value of about 360 nm and the half width Respectively.

From these experimental results, it can be applied for sterilizing disinfection by using UV emitted from the fluorescent sheet constituting the electroluminescence panel of the present invention, or as excitation light for the wavelength conversion phosphor excited in ultraviolet rays, Since it can be used as a light source of an ultraviolet ray exposure apparatus in which a large number of optical apparatuses are required, exposure can be performed without an optical apparatus, so that the structure of the exposure apparatus can be simplified and used in a large area.

Example 2

(Zn _2-x (Si, Ge) O ₄ : Mn ²⁺ _x  An electroluminescent panel using a fluorescent sheet)

A zinc oxide (ZnO), silica (SiO2), and manganese oxide (MnO) as a fluorescent material for emitting green 2: 1: Put in a vessel in a ratio of 0.06, a GeO ₄ as an additive in a weight ratio of 10% of the total weight of the phosphor The mixture was mixed and milled by ball milling, and then a phosphor emitting green light was prepared by a solid-phase reaction method through heat treatment at 1000 ° C for 12 hours.

A fluorescent sheet, a dielectric sheet, a back electrode layer, and a transparent electrode layer were formed on the obtained phosphor powder in the same manner as in Example 1.

The thus fabricated electroluminescent panel was driven using the same AC power supply as in Example 1. As a result, as shown in the emission spectrum of FIG. 4, the maximum value of 540 nm and the half width of 80 nm were shown.

Example 3

(ZnGa ₂ O ₄ : Mn ²⁺  An electroluminescent panel using a fluorescent sheet)

As a phosphor emitting green light, zinc oxide (ZnO), gallium oxide (Ga ₂ O ₃ ) and manganese oxide (MnO) were put into a vessel at a ratio of 1: 1: 0.00 and LiF was selected as a flux, %, Followed by ball milling, followed by pulverization. The pulverized mixture was heat-treated at 1100 占 폚 for 12 hours in a heating furnace in a reducing atmosphere with a hydrogen-mixed gas to obtain green light-emitting ZnGa ₂ O ₄ : Mn ²⁺ Phosphor powders were synthesized by synthesizing phosphors to emit green light.

A fluorescent sheet, a dielectric sheet, a back electrode layer, and a transparent electrode layer were formed on the obtained phosphor powder in the same manner as in Example 1.

The thus fabricated electroluminescent panel was driven using the same AC power supply as in Example 1. As a result, as shown in the emission spectrum of FIG. 5, the maximum value of about 510 nm and the half width of 50 nm were shown.

Example 4

(Waveform of ZnGa ₂ O ₄ : Mn ²⁺  An electroluminescent panel using a fluorescent sheet)

The fluorescent sheet of Example 3 was corrugated using a mold having a wave number of 1 per mm per cycle, and then a corrugated dielectric sheet having a shape corresponding to that of the corrugated fluorescent sheet was prepared. As shown in FIG. 5, an electroluminescent panel having a back electrode layer and a transparent electrode layer having a corrugated shape was fabricated and driven. As a result, compared with Example 3 using a flat fluorescent sheet and a dielectric sheet, the light emission luminance was improved by about 160% .

This suggests that this is a new backlight capable of overcoming the limitation of the use of backlight such as LCD due to low emission luminance of the conventional inorganic electroluminescent device.

The embodiments of the present invention described above should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

According to the electroluminescent panel using the sintered ceramic fluorescent sheet of the present invention configured as described above, since a solid fluorescent sheet is used in place of the glass or polymer substrate, the structure is simplified, The lifetime of the device is improved, and electrons are directly supplied to the electrically conductive fluorescent material to provide a highly efficient electroluminescent device.

Further, when the solid dielectric sheet is thermally adhered to the fluorescent sheet, the strength and durability are excellent. In the case of forming the curved portion in the fluorescent sheet, the light emission area is enlarged and the luminance reduction phenomenon due to the conventional total internal reflection is minimized, It becomes possible to maximize it.

Further, since the fluorescent matrix or the activator can be selected depending on the purpose of use, it can be used for various purposes such as a sterilizing apparatus, a light source of an exposure apparatus, a back light source of a display element, and a lighting apparatus.

Claims (11)

A phosphor layer made of a ceramic fluorescent sheet sintered with a phosphor powder , Wherein the fluorescent sheet emits near-ultraviolet light or blue light, and a wavelength converting fluorescent film having strong absorption in each light emitting region is further formed on the upper surface of the fluorescent sheet. The method according to claim 1, The phosphor powder, as the fluorescent matrix (Zn, Mg) (Ga, Al) 2 O 4, (Y, Ga) 2 O 3, Zn 2 (Si, Ge) O 4, Zn (S, O), (Mg , Ca, Sr, Ba) S , (Mg, Ca, Sr, Ba) Al 2 S 4, (Y, Gd) 5 (Ga, Al) 5 O 12, (Mg, Ca, Sr, Ba) Ga 2 S _{4, (Al, Ga) N} , (Ca, Sr, Ba) (Ga, Al) 2 O 4, (Ca, Sr, Ba) 3 Ga 2 O 6, (Mg, Ca, Sr, Ba) (Al, Y) ₂ S ₄ , and (Ca, Sr, Ba) ₂ (Zn, Mg) S ₃ . The method according to claim 1, The phosphor powder, _{NaCl, NH 4 Cl, H 3} BO 3, B 2 O 3, LiF, Cu (C 2 H 3 O 2) 2 · H 2 O GeO 2, SiO 2, SnO 2, AlN, GaN, Al ₂ O _3, Ga ₂ O ₃ , and In ₂ O ₃ are added to the electroluminescent panel. delete The method according to claim 1, Wherein the fluorescent sheet emits near-ultraviolet light or blue light, and a sintered ceramic fluorescent sheet used as a backlight source of a display element or a lighting device is further provided on the upper surface of the fluorescent sheet to further absorb wavelength- Electroluminescent panel. delete The method according to claim 1, A fluorescent film for the wavelength _{conversion, Y 3 Al 5 O 12:} Ce, Tb 3 Al 5 O 12: Ce, (Ba, Sr, Ca) 2 SiO 4: Eu, (Ba, Sr, Ca, Zn) S: Eu , (Ba, Sr, Ca) AlON: Eu, and the sintered ceramic fluorescent sheet. A phosphor layer made of a ceramic fluorescent sheet sintered with a phosphor powder, And a ceramic dielectric sheet obtained by sintering a dielectric powder is thermally cemented on the fluorescent sheet to form an electric field-emitting panel using the sintered ceramic fluorescent sheet. A phosphor layer made of a ceramic fluorescent sheet sintered with a phosphor powder, Wherein the fluorescent sheet is formed in a wave form. Sintering the phosphor powder to form a ceramic fluorescent sheet; Forming a dielectric layer on the upper surface of the fluorescent sheet; Forming a first electrode on the dielectric layer; And And forming a second electrode on the lower surface of the fluorescent sheet. 11. The method of claim 10, Wherein the dielectric layer is formed by thermally adhering a ceramic dielectric sheet sintered with a dielectric powder on the upper surface of the fluorescent sheet.

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