CN1257641A - Electroluminescent device and method for producing the same - Google Patents
Electroluminescent device and method for producing the same Download PDFInfo
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- CN1257641A CN1257641A CN98805242A CN98805242A CN1257641A CN 1257641 A CN1257641 A CN 1257641A CN 98805242 A CN98805242 A CN 98805242A CN 98805242 A CN98805242 A CN 98805242A CN 1257641 A CN1257641 A CN 1257641A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
- H05B33/145—Arrangements of the electroluminescent material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
- G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
- G09F2013/227—Electroluminescent displays for vehicles
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- Electroluminescent Light Sources (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
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Abstract
An electroluminescent device and a method for making it are disclosed. The device has a transparent substrate (1), a transparent conductive layer (2) placed on the back surface of said transparent substrate (1), a luminescent layer (8) comprising luminescent particles (7) and a matrix resin and being placed on the back surface of said transparent conductive layer (2), and a rear electrode (6) placed on the back surface of said luminescent layer (8), wherein said luminescent layer (8) has a transparent support layer (3) comprising a matrix resin and being placed on the side of said transparent conductive layer (2), an insulating layer (5) comprising an insulating material and being placed on the side of said rear electrode, and a luminescent particle layer (4) consisting essentially of particles which comprise luminescent particle (7) and are embedded in both said support layer (3) and said insulating layer (5).
Description
Invention field
The present invention relates to electroluminescent device (hereinafter being called " El element "), it has the luminescent layer that comprises light-emitting particles and matrix resin.Specifically, the present invention relates to a kind of El element with high brightness, described device based on notion be different from the notion of routine " decentralized luminescent layer ".
Background of invention
Known El element comprises so-called " decentralized luminescent layer ", and it forms by light-emitting particles (as fluorescent material) being dispersed in the matrix resin polymer of high-k (as have), is found in following publication:
For example, JP-B-59-14878 has disclosed a kind of El element, it comprises transparent base, transparent electrode layer, the insulating barrier of being made up of vinylidene fluoride class matrix resin, the luminescent layer that comprises vinylidene fluoride class matrix resin and fluorescent grain, insulating barrier and backplate same as described above, and above-mentioned these layers are with this sequential laminating.
JP-B-62-59879 has disclosed a kind of El element, and it comprises polyester film, ITO electrode, comprises the luminescent layer and the aluminium foil (backplate) of cyanoethylation ethylene-vinyl alcohol copolymer (matrix resin) and fluorescent grain, and with this sequential laminating.
Summary of the invention
Yet, this class " decentralized luminescent layer " almost can not increase brightness, because the proportion of light-emitting particles is greater than matrix resin, these light-emitting particles tend in comprising the coating that is used to form luminescent layer that light-emitting particles is scattered in substrate resin solution, therefore are difficult to light-emitting particles is evenly dispersed in the matrix resin in the luminescent layer that is formed by this coating.
And, for improve light-emitting particles in luminescent layer filling rate and increase light-emitting particles in coating during consumption, dispersed can variation.Therefore, the addition of light-emitting particles is restricted.
In addition, use the difficult coating layer thickness that increases luminescent layer of this class dispersing coating with uniform thickness.Therefore, just should increase the number of times that applies coating when increasing light emitting layer thickness, so productivity ratio descends, and be difficult to obtain the large tracts of land El element of sheet in order to improve brightness.
An object of the present invention is to provide a kind of El element, this El element has increased the filling rate of light-emitting particles in luminescent layer, has significantly improved brightness, and the problems referred to above of conventional device are solved.
Another object of the present invention provides a kind of method that is used to prepare El element, and it can make high brightness, large-area sheet El element with high production rate, and does not use above-mentioned dispersing coating.
(referring to Fig. 1) according to a first aspect of the invention the invention provides a kind of electroluminescent device, and it comprises:
A) transparent base (1),
B) transparency conducting layer (2), it is placed on the back side of described transparent base (1),
C) luminescent layer (8) comprises light-emitting particles (7) and matrix resin, be placed on the back side of described transparency conducting layer (2) and
D) backplate (6) is placed on the back side of described luminescent layer (8),
Wherein, described luminescent layer (8) comprises:
(c-1) transparent bearing bed (3), it comprises matrix resin, is placed on described transparency conducting layer (2) one sides,
(c-2) insulating barrier (5), it comprises insulating material, be placed on described backplate one side and
(c-3) light-emitting particles layer (4) is made up of a plurality of particles basically, and these particles comprise light-emitting particles (7), and embeds in described bearing bed (3) and the described insulating barrier (5).
According to a second aspect of the invention, the invention provides a kind of method that is used to make electroluminescent device, described electroluminescent device comprises transparent base (1), be placed on the transparency conducting layer (2) on described transparent base (1) back side, comprise light-emitting particles (7) and matrix resin, be placed on the luminescent layer (8) on described transparency conducting layer (2) back side, and be placed on backplate (6) on described luminescent layer (8) back side, said method comprising the steps of:
I) provide a slice transparent base (1), at the one side upper strata of this base material unification layer transparency conducting layer (2),
Ii) on described transparency conducting layer (2), apply a kind of coating that is used to form the bearing bed (3) that one deck comprises matrix resin,
Before described paint solidification, make the particle spreading that comprises light-emitting particles (7) become stratiform, and the part of each particle embed in the described coating,
Solidify described coating, one deck light-emitting particles layer (4) that forms transparent bearing bed (3) and bond with described bearing bed (3),
Iii) on described light-emitting particles layer (4), apply a kind of coating that is used to form the insulating barrier (5) that comprises insulating material, solidify described coating, form with the bonding described insulating barrier (5) of described light-emitting particles layer (4) and
Iv) backplate (6) is laminated on the described insulating barrier (5).
In El element of the present invention, light-emitting particles layer (4) contained in the luminescent layer (8) comprises the particle that contains light-emitting particles substantially, and is positioned between bearing bed (3) and the insulating barrier (5), and is two-layer bonding with this.Therefore, the filling rate of light-emitting particles increases in the luminescent layer (8), and brightness also increases significantly.
And, when use comprises step I) when preparing El element, needn't resemble the dispersing coating that uses light-emitting particles the routine techniques to iv) the inventive method, can make with high production rate have high brightness, large-area sheet El element.
Brief description of drawings
Fig. 1 is the profile of a kind of El element of the present invention.
The working of an invention scheme
Fig. 1 shows the section of an example of El element of the present invention, and it has following numeral number and element:
1: transparent base, 2: transparency conducting layer, 3: bearing bed; 4: light-emitting particles layer, 5: insulating barrier, 6: the back side 30 electrodes, 7 light-emitting particles, 8: luminescent layer.
El element
El element comprises laminates, backplate (6) that a slice has transparent base (1) and transparency conducting layer (2), is positioned at the luminescent layer (8) between this laminates and the backplate (8).The structure of this form El element is except the structure difference of luminescent layer (8), and the structure with conventional dispersion-type el device is identical substantially.
Luminescent layer (8) hereinafter will elaborate, and its structure is: comprise matrix resin transparent bearing bed (3), contain insulating material insulating barrier, be positioned at the light-emitting particles layer (4) between layer (3) and layer (5), they lump together with tight contact layer.
The gross thickness of El element is usually in the scope of 50-3000 μ m.
Transparent base
Transparent base can be identical with the used base material of dispersion-type el device, for example can use glass plate, plastic film etc.The example of plastic film is the film of following these resins: mylar, as PETG (PET), PEN (PEN) etc.; Acrylic resin is as polymethyl methacrylate, modified poly (methyl methacrylate) etc.; Fluororesin is as Kynoar of Kynoar, acryloyl group modification etc.; Polycarbonate resin; Vinyl chloride resin is as vinyl chloride copolymer; Deng.
Transparent base can be monofilm (as shown in Figure 1), but also can be multilayer film.For example, when one deck at least of multilayer film has high degree of transparency and contains a kind of dyestuff when showing that luminescent layer sends the complementary colours of color, the whiteness of light can increase.Be preferably, when only blue-green that luminescent layer sends, the example of these dyestuffs is red or pink fluorescent dye, as rhodamine 6G, rhodamine B, perylene dyestuff etc.
The two sides of transparent base is normally flat, yet if do not damage effect of the present invention, the one side that contacts with transparency conducting layer can not have prismatic.
The light transmittance that sees through transparent base is at least 60% usually, better is at least 70%, particularly is at least 80%." light transmittance " is meant the light transmittance that uses the light of 550nm to record according to the K7105 of Japanese Industrial Standards.
If do not damage effect of the present invention, transparent base can contain additive, as ultra-violet absorber, hygroscopic agent, colouring agent, fluorescent material, phosphor etc.
Transparency conducting layer
Transparency conducting layer is positioned at the back side of transparent base, with it closely contact.
Transparency conducting layer can be any transparency electrode that is used for dispersion-type el device, as ITO (tin indium oxide) film etc.The thickness of transparency conducting layer is generally 0.1-1000 μ m, surface resistivity be generally 1000-500 Ω/square, better be about 200-300 Ω/square.Light transmittance is at least 70% usually, is at least 80% preferably.
The ITO film can form with the film build method of any routine, as vapour deposition, sputter, thickener coating etc.
The ITO film is formed directly on the transparent base in the embodiment of Fig. 1, yet also can form one deck priming coat on transparent base, forms one deck ITO film then on priming coat.The method that replaces priming coat can be that the surface of transparent base is handled so that bonding ITO film with corona etc.Perhaps can on luminescent layer, form ITO film, laminated transparent base on the ITO film then.
The backplate layer is positioned at the back side of luminescent layer, promptly towards a side of insulating barrier.In the embodiment of Fig. 1, backplate directly contacts with luminescent layer.
One deck resin bed is provided between electrode and the luminescent layer overleaf, is used to improve bonding force between the two.The resin that is used for resin bed can be the polymer with high-k, hereinafter can illustrate.Resin bed can contain the organic granular of insulation.
Backplate can be the conducting film that is used for dispersion-type el device, as the metal film of aluminium, gold, silver, copper, nickel, chromium etc.; Nesa coating is as the ITO film; Deng.Metal film can be vapour deposition film, sputter coating, metal forming etc.
The thickness of backplate is usually between 5-1000 μ m.
Be made up of the electrically conducting transparent tunic and insulating barrier when being transparent when backplate, El element can be from lighting at two sides.
Bearing bed
The bearing bed that is used for luminescent layer is preferably the back side and the closely contact with it that is positioned at transparency conducting layer, thereby can easily improve the luminous efficiency of luminescent layer.
Bearing bed is the hyaline layer that contains matrix resin.Usually between 5-1000 μ m, light transmittance is at least 70% to the thickness of bearing bed usually, is at least 80% preferably.
Matrix resin can be the resin that is used for dispersion-type el device, as epoxy resin, has the polymer of high-k etc.Polymer with high-k is that those dielectric constants are at least about 5 usually, is preferably 7-25, and the polymer of 8-18 more preferably, dielectric constant are that the alternating current of using 1kHz records.When dielectric constant was too low, brightness can not increase.When dielectric constant was too high, the life-span of luminescent layer tended to shorten.
Example with polymer of high-k is vinylidene fluoride resin, cyanaloc etc.For example, the vinylidene fluoride resin can obtain by the combined polymerization of vinylidene fluoride and at least a other fluorochemical monomer.The example of other fluorochemical monomer is tetrafluoroethene, chlorotrifluoroethylene, hexafluoropropylene etc.The example of cyanaloc is cyanethyl cellulose, cyanoethylation ethylene-vinyl alcohol copolymer etc.
Bearing bed is made up of matrix resin in the embodiment of Fig. 1, if yet do not damage effect of the present invention, bearing bed can contain additive, as other resin, filler, surfactant, ultra-violet absorber, antioxidant, antiseptic, rust inhibitor, hygroscopic agent, colouring agent, phosphor etc.For example when only blue-green that the light-emitting particles layer sends, bearing bed can contain red or peach fluorescent dye, as rhodamine 6G, rhodamine B, perylene dyestuff etc.And above-mentioned other resin can be curable or viscosity.
Insulating barrier
The contained insulating material of the insulating barrier of luminescent layer can be the insulated particle that is used for dispersion-type el device, the polymer with high-k etc.
Insulating barrier is by insulated particle being dispersed in the coating that the coating that makes in the polymer of high-k forms in the embodiment of Fig. 1.The example of insulated particle is the inorganic particle of insulation, for example titanium dioxide, barium titanate etc.The polymer of high-k can be the polymer that is used for bearing bed.
Insulating barrier can form by coating being coated on backplate or the light-emitting particles layer.
When insulating barrier is that the amount of insulated particle is the 1-400 weight portion, is preferably the 10-300 weight portion when comprising the coating of polymer of insulated particle and high-k, 20-200 weight portion more preferably is in the polymer of per 100 weight portion high-ks.When the amount of insulated particle was too low, insulation effect descended, thereby brightness tends to descend.When the amount of insulated particle is too high, coating apply difficulty.
The thickness of insulating barrier is generally 5-1000 μ m.Insulating barrier can contain additive, as filler, surfactant, antioxidant, antiseptic, rust inhibitor, hygroscopic agent, colouring agent, phosphor, curable resin, tackifier etc., only otherwise the infringement insulation property.
The light-emitting particles layer
Light-emitting particles in the light-emitting particles layer can be spontaneously luminous in being in AC field the time.The fluorescent grain that is used for dispersion-type el device can be used as this class particle.The example of fluorescent material is independent fluorescent chemicals material (as ZnS, CdZnS, ZnSSe, CdZnSe etc.), and perhaps fluorescent chemicals and helper component are (as Cu, I, Cl, Al, Mn, NdF
3, Ag, B etc.) mixture.
The particle mean size of fluorescent grain is generally 5-100 μ m.Can use the granular fluorescent material of the coated film that on it, is formed with one deck glass, pottery etc.
The thickness of light-emitting particles layer is generally 5-500 μ m.When the fluorescent grain layer was made up of a plurality of particles that are placed to an individual layer, El element can easily be done very thinly.
And the light-emitting particles layer can contain at least two kinds of light-emitting particles.For example, at least two kinds of light-emitting particles that send blueness, blue-green or orange-colored light and have a discontinuous spectrum are each other mixed, can form luminescent layer thus with high whiteness.
The content of light-emitting particles is 40% (weight) preferably at least in the light-emitting particles layer.When content was lower than 40% (weight), the effect that improves brightness can reduce.When particle was made up of light-emitting particles, brightness reached maximum.What therefore, the content of light-emitting particles was good especially is 50-100% (weight).
Except that light-emitting particles, the light-emitting particles layer can also contain one or more particles, for example the particle of glass, coloured material, phosphor, polymer, inorganic oxide etc.For example, the pink coloured material of the light-emitting particles of the green light of will turning blue and glaucous complementary colours (as contain rhodamine 6G, rhodamine B etc. particle) mixes mutually, forms the luminescent layer with high whiteness.
Form luminescent layer
The laminate structures that comprises the luminescent layer of bearing bed, light-emitting particles layer and insulating barrier can followingly form:
At first, the powder coating method with any routine forms one deck light-emitting particles layer on the surface of bearing bed or insulating barrier.
For example, the particle that uses suitable method (as static suction, spraying, gravity distribution etc.) will comprise light-emitting particles when substrate layer keeps mobile is sprinkling upon on the substrate layer, and part or all that has formed particle embeds the light-emitting particles layer in bearing bed.After this, the flowability of bearing bed disappears, and bearing bed and stratum granulosum are bonding.In order to keep the flowability of bearing bed, be preferably and use following method: the coating that is formed by the solvent-laden coating that is used for bearing bed keeps the not method of drying regime, keep the method for bearing bed and the monomer methods that adds radiation-hardenable to the coating that is used for bearing bed in the temperature of softening point that is higher than the used resin of bearing bed or fusing point.These methods make the curing (drying, cooling or sclerosis) that is used to suppress the bearing bed flowability become easy.
Equally, luminescent layer can form on the insulating barrier that is made of coating.
Last one deck (bearing bed or insulating barrier) is laminated on the light-emitting particles layer that as above forms, forms three layers of ray structure that is bonded together.Final one deck is preferably by applying a kind of coating and curing that contains the material that is used to form final layer, perhaps forms laminated by pressure binding by the film that the material that is used to form final layer makes.These methods can guarantee to form glued construction, bearing bed, light-emitting particles layer and insulating barrier each between the interface on can not have any bubble.
In the embodiment of Fig. 1, the light-emitting particles layer is made up of a plurality of particles that are placed to an individual layer, and is should layer bonding with bearing bed and insulating barrier.Yet the light-emitting particles layer also can be a multilayer, and perhaps part or all of particle can be fully inserted in bearing bed or the insulating barrier.Importantly form such glued construction, wherein there is not bubble in the light-emitting particles layer on the interface between every pair of layer between bearing bed and insulating barrier.
In the light-emitting particles layer that as above forms, the material of bearing bed or insulating barrier is full of gap between particles.In this case, the filling rate of particle is at least 20% (volume) usually, better is at least 30% (volume), better is at least 40% (volume), because the reduction of filling rate can cause lowering of luminance.
" filling rate of particle " is defined as the particle cumulative volume and accounts for comprising all particles in the light-emitting particles layer and being present in the percentage of the volume of the layer of material between these particles of hypothesis herein.
In addition, each layer in bearing bed and the insulating barrier can be the laminated layer of two-layer or multilayer, only otherwise damage effect of the present invention.
The preparation of El element
The preparation method who is suitable for preparing above-mentioned El element of the present invention is described now.
At first, provide a slice transparent base, laminated in its surface transparency conducting layer.On transparency conducting layer, apply the coating that is used to form bearing bed.After this, on the coating that the particle that will contain light-emitting particles before the coating drying is applying with the stratiform spreading, particulate fraction is embedded in the bearing bed, make the coating drying then.These steps can easily form and be partially submerged into bearing bed and the light-emitting particles layer bonding with it.
These particles embed in bearing beds be make each particle at the common 1-99% of the size of vertical direction (to the bearing bed plane), better be 10-90%, be more preferably 20-80% and embed in the bearing bed.When embedding percentage less than 1% the time, stratum granulosum tends to destroyed in the process that forms insulating barrier.When the embedding percentage of particle surpasses 99%, just can not be formed uniformly stratum granulosum.
Selection be used to form bearing bed coating coating layer thickness so that the dried thickness of bearing bed in above-mentioned scope.Be used to form solids content in the coating of bearing bed usually between 5-80% (weight).From conventional organic solvent, select used solvent in the coating so that matrix resin dissolves equably.
Coating can be prepared with mixing or kneader device (as homogeneous mixer, sand mill, planetary-type mixer etc.).
The coating equipment that can be used for applying coating for example is scraping strip coating machine, roll coater, blade coating machine, die coater etc.
Drying condition depends on the solids content of solvent types and coating in the coating, and to 150 ℃ of scopes, drying time is in 5 seconds kind to 1 hour scopes in room temperature (about 25 ℃) for typical temperature.
Use said method spreading particle after applying the coating that is used to form bearing bed in 1 minute, this makes particle easily to embed.The degree of drying of coating depends on the wetability between particle and the bearing bed, represents with solids content, and in the scope of 10-95% (weight), better be 20-90% (weight) usually.
Apply the coating that is used to form insulating barrier subsequently, cover light-emitting particles layer and dry.Form glued construction thus, wherein the light-emitting particles layer embeds in bearing bed and the insulating barrier, does not have bubble on the interface between the every pair of layer.
Selection is used to form the coating layer thickness of the coating of insulating barrier, makes the dry thickness of insulating barrier in above-mentioned scope.
The solids content that is used to form the coating of insulating barrier is generally 5-70% (weight).From conventional organic solvent, select solvent for use in the coating, make insulating material dissolve equably or disperse.
Prepare that equipment used with applying this coating or instrument can with preparation and to apply the equipment or the instrument of the coating that is used to form bearing bed identical.
Drying condition depends on the solids content of solvent types and coating in the coating, and to 150 ℃ of scopes, drying time is in 5 seconds kind to 1 hour scopes in room temperature (about 25 ℃) for typical temperature.
At last, backplate is laminated on the insulating barrier.Backplate can form with said method.Wherein, being used for film forming in a vacuum method (as vapour deposition and sputter) is preferably, can be used for effectively going up at insulating barrier (it after drying in) forming backplate, and good bonding force is arranged between backplate and the insulating barrier.
Each step of above-mentioned preparation method is substantially the same with the conventional method of preparation sheet products.Therefore, use the preparation process of conventional sheet products can high production rate to make and have high brightness and large-area sheet El element.And, because said method does not resemble the dispersing coating that light-emitting particles is used in preparation the dispersion-type el device, so by using the problem that dispersing coating produced to be solved,
El element can make with the other method that is similar to said method, comprise: apply the coating that is used for insulating barrier on the backing of backplate comprising, spreading light-emitting particles before the coating drying that applies, the part of stratum granulosum is embedded in the insulating barrier, the dry then coating that is used for insulating barrier, apply the coating and the drying that are used for bearing bed, last laminated transparent base with transparency conducting layer.This method has the effect identical with said method.
The application of El element
El element of the present invention can be used as the back-lighting light source of LCD (as the liquid crystal instrument plate of automobile).In addition, the light source of El element usable as internal illumination type display of the present invention (as billboard, road sign, decoration with display etc.).
For example, image (as character, pattern etc.) is printed on the surface of light transmission piece, and this light transmission piece is placed on the El element, and its back side is in the face of the light-emitting area of El element.This light transmission piece can be with making with above-mentioned transparent base identical materials, and the light transmittance of light transmission piece is at least 20%.In this case, best bonded to each other being in the same place of the light-emitting area of the back side of light transmission piece and El element.In order to realize this purpose, use light-transmissive adhesive.The example of this class adhesive is pressure-sensitive acrylic class adhesive, temperature-sensitive acrylic adhesives etc.
Perhaps, the El element built-in display can followingly be assembled: use the as above light transmission piece of transparent base, directly form transparency conducting layer on the back side of this light transmission piece, luminescent layer is laminated on the conductive layer.
And the prismatic Rectroreflective sheet can be used as light transmission piece (or transparent base).Can give the El element built-in display with retroreflectiveness and self-luminosity with combining of Rectroreflective sheet.
To be connected with power supply respectively with two terminals that transparency conducting layer is connected with the backplate layer, apply voltage, from El element, emit beam like this to El element.
As light source, can use battery, as dry cell, storage battery, solar cell etc., perhaps provide alternating current by converter (it can change voltage or frequency) to El element by power line, electric current is changed between AC and DC.The voltage that applies is generally 3-200V.
El element of the present invention has high-luminous-efficiency, therefore can send down at the voltage lower than the necessary voltage of conventional dispersion-type el device (as 100V or lower) to have enough brightness (as 50cd/m
2Or higher) light.
When El element uses out of doors, be preferably and be coated with film that catchments (water-capturing films) (as making) or moisture barrier films (as making) by polytetrafluoroethylene by polyamide.
Embodiment 1
The preparation of El element
(thickness is 75 microns with ITO/PET laminate film (trade name: TCF-KPC 300-75 (A), by OIKE Industries, Ltd. makes); Light transmittance is 81%) as transparent base with ITO layer.This film has the transparency conducting layer of ITO, and it is that sputter is to a surface of this film and laminated formation.The thickness of ITO layer is 550nm, and surface resistivity is 250 12/ squares.
Polymer (hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-the vinylidene fluoride copolymer that will have high-k with homomixer, commodity are called " THV 200P ", its dielectric constant is 8 (under 1kHz), light transmittance is 96%) mix and solve homogeneously in the ethyl acetate, so make the coating that is used for bearing bed separately.The solids content of this coating is about 25% (weight).
The coating that is used to form bearing bed is applied on the laminated transparency conducting layer on transparent base.On the coating that before this coating drying light-emitting particles is being applied with the form spreading of an individual layer basically and embed in the coating so that about 50% diameter sinks to wherein.After this, dry this coating.Apply this coating with otch scraping article (its scraping article is set at 50 microns), rapid spreading particle after having applied this coating.Drying condition comprises that temperature is about and 65 ℃ and drying time is about 1 minute.Light-emitting particles is ZnS light-emitting particles (trade name: S-728 is made by OSRAM SYLVANIA, and particle mean size is about 23 microns).
Then, apply the coating that is used to form insulating barrier,, form insulating barrier so that this coating covers light-emitting particles layer and dry.Form glued construction thus, wherein the light-emitting particles layer embeds in bearing bed and the insulating barrier, does not have bubble on the interface between every pair of layer.
The coating that is used to form insulating barrier is prepared by the preparation method of the coating that is used to form bearing bed, different is that polymer (above-mentioned THV 200 P), insulated particle (barium titanate is made by KANTOKAGAKU) and the ethyl acetate that will have high-k mix.The weight ratio of polymer and insulated particle is 100: 80, and the solids content of coating is about 38% (weight).Apply this coating with otch scraping article (its scraping article is set at 100 microns), drying condition comprises that temperature is about and 65 ℃ and drying time is about 1 minute.
At last, be combined in layer by layer on the insulating barrier, obtain membranaceous El element of the present invention with the backplate of vacuum deposition with aluminum.In this step, vacuum deposition is to use vacuum deposition equipment " EBV-6DA " (being made by ULVAC) 10
-5Carry out 5 seconds kinds under torr or the lower decompression.
Luminous from El element
Two terminals are linked to each other with the backplate layer with the transparency conducting layer of present embodiment El element (making by above-mentioned pellet parts are cut into the square of 100mm * 100mm) respectively, and with power supply (PCR 500L, by KIKUSUI ELECTRONIC INDUSTRIES, Ltd. makes) be connected.Then, at two set conditions (condition A:100V, 400Hz; Condition B:120V applies alternating voltage to this device under 600Hz).El element sends light equably under these two kinds of conditions.
El element is placed the darkroom, use luminance meter (LS110 is made by MINOLTA) to measure brightness at 1 meter of distance transparent substrate surface.The results are shown in table 1.
Comparative example 1
Prepare El element by embodiment 1 identical method, different being to use " decentralized " luminescent layer.
The following formation of " decentralized " luminescent layer:
Polymer (100 weight portion), fluorescent grain (150 weight portion) and the ethyl acetate of the used identical high-k of embodiment 1 is mixed and disperse with homogeneous mixer, obtain being used to form the coating of luminescent layer.The solids content of this coating is about 45% (weight).Use otch scraping article (its scraping article is set at 80Km) this coating to be coated on the transparency conducting layer of transparent base, in about 1 minute of 65 ℃ of dryings.
The brightness of present embodiment El element is measured by embodiment 1 identical mode, the results are shown in table 1.
Prepare El element by embodiment 1 identical method, different is as fluorescent grain with ZnS fluorescent grain (S-723 is made by OSRAM SYLVANIA).The brightness of present embodiment El element is measured by embodiment 1 identical mode, the results are shown in table 1.
Prepare El element by embodiment 1 identical method, different is with the polymer of cyanaloc (CR-M 723, made by SHINETSU CHEMICAL) with the high-k that acts on bearing bed and insulating barrier.The brightness of present embodiment El element is measured by embodiment 1 identical mode, the results are shown in table 1.
Table 1
| Polymer with high-k | Fluorescent grain | Brightness conditions A | ????(cd/m 2) condition B | |
| Embodiment 1 | ??THV?200P | ????S-728 | ????52.2 | ????105.7 |
| | ??THV?200P | ????X-723 | ????58.9 | ????98.8 |
| | ??CR-M | ????S-728 | ????85.3 | ????146.7 |
| Comparative example 1 | ??THV?200P | ????S-728 | ????26.0 | ????44-4 |
The effect of invention
The present invention can easily improve the filling rate of light-emitting particles in the luminescent layer, the brightness of gained El element be dispersion-type el device brightness at least about 2 times.
The present invention can make the sheet El element of large tracts of land, high brightness with high production rate, and does not use any dispersing coating that is used to form luminescent layer.According to the present invention, having large-area sheet El element can following a large amount of production: wide 25-200cm, long 100-20 are provided, the transparent base sheet of the coiling of 000m, laminated successively transparent conduction tack coat, bearing bed, light-emitting particles layer, insulating barrier and backplate.
Claims (2)
1. electroluminescent device, it comprises:
A) transparent base (1),
B) transparency conducting layer (2), it is placed on the back side of described transparent base (1),
C) luminescent layer (8) comprises light-emitting particles (7) and matrix resin, be placed on the back side of described transparency conducting layer (2) and
D) backplate (6) is placed on the back side of described luminescent layer (8),
Wherein, described luminescent layer (8) comprises:
(c-1) transparent bearing bed (3), it comprises matrix resin, is placed on described transparency conducting layer (2) one sides,
(c-2) insulating barrier (5), it comprises insulating material, be placed on described backplate one side and
(c-3) light-emitting particles layer (4) is made up of a plurality of particles basically, and these particles comprise light-emitting particles (7), and embeds in described bearing bed (3) and the described insulating barrier (5).
2. method that is used to make electroluminescent device, described electroluminescent device comprises transparent base (1), be placed on the transparency conducting layer (2) on described transparent base (1) back side, comprise light-emitting particles (7) and matrix resin, be placed on the luminescent layer (8) on described transparency conducting layer (2) back side, and be placed on backplate (6) on described luminescent layer (8) back side, said method comprising the steps of:
I) provide a slice transparent base (1), at the one side upper strata of this base material unification layer transparency conducting layer (2),
Ii) on described transparency conducting layer (2), apply a kind of coating that is used to form the bearing bed (3) that one deck comprises matrix resin,
Before described paint solidification, make the particle spreading that comprises light-emitting particles (7) become stratiform, and the part of each particle embed in the described coating,
Solidify described coating, one deck light-emitting particles layer (4) that forms transparent bearing bed (3) and bond with described bearing bed (3),
Iii) on described light-emitting particles layer (4), apply a kind of coating that is used to form the insulating barrier (5) that comprises insulating material, solidify described coating, form with the bonding described insulating barrier (5) of described light-emitting particles layer (4) and
Iv) backplate (6) is laminated on the described insulating barrier (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9128626A JPH10335064A (en) | 1997-05-19 | 1997-05-19 | Electroluminescent element and its manufacture |
| JP128626/1997 | 1997-05-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1257641A true CN1257641A (en) | 2000-06-21 |
Family
ID=14989462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98805242A Pending CN1257641A (en) | 1997-05-19 | 1998-03-27 | Electroluminescent device and method for producing the same |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0992177A1 (en) |
| JP (1) | JPH10335064A (en) |
| KR (1) | KR20010012691A (en) |
| CN (1) | CN1257641A (en) |
| AU (1) | AU6782498A (en) |
| BR (1) | BR9809125A (en) |
| CA (1) | CA2289085A1 (en) |
| WO (1) | WO1998053645A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425103C (en) * | 2001-03-29 | 2008-10-08 | 富士胶片株式会社 | Electrolumine scence device |
| CN101682099B (en) * | 2007-05-30 | 2014-04-16 | 日本电气硝子株式会社 | Laminate and solar battery using the laminate |
| CN106793354A (en) * | 2016-11-21 | 2017-05-31 | 万峰 | A kind of luminous paint system |
| CN110637345A (en) * | 2017-09-19 | 2019-12-31 | 株式会社Lg化学 | Electrode substrate for transparent light emitting device display and method of manufacturing the same |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11175007A (en) * | 1997-11-21 | 1999-07-02 | Minnesota Mining & Mfg Co <3M> | Self-luminous retroreflection sheet capable and manufacture thereof |
| US6479941B1 (en) | 1998-10-30 | 2002-11-12 | 3M Innovative Properties Company | Electroluminescent device and method for the production of the same |
| JP2000133465A (en) * | 1998-10-30 | 2000-05-12 | Minnesota Mining & Mfg Co <3M> | Electroluminescent element and its manufacture |
| JP2000208275A (en) * | 1999-01-14 | 2000-07-28 | Minnesota Mining & Mfg Co <3M> | Electroluminescent element and manufacture thereof |
| US6613455B1 (en) | 1999-01-14 | 2003-09-02 | 3M Innovative Properties Company | Electroluminescent device and method for producing same |
| DE60035101T2 (en) * | 1999-01-21 | 2008-01-31 | Reflexite Corp., Avon | PERMANENT, OPEN-FLAT RETRORE-LOOKING PRISMATIC CONSTRUCTION |
| US6967053B1 (en) | 1999-01-21 | 2005-11-22 | Reflexite Corporation | Durable, open-faced retroreflective prismatic construction |
| WO2002087308A2 (en) | 2001-04-30 | 2002-11-07 | Lumimove, Inc. | Electroluminescent devices fabricated with encapsulated light emitting polymer particles |
| US7361413B2 (en) * | 2002-07-29 | 2008-04-22 | Lumimove, Inc. | Electroluminescent device and methods for its production and use |
| US7029763B2 (en) | 2002-07-29 | 2006-04-18 | Lumimove, Inc. | Light-emitting phosphor particles and electroluminescent devices employing same |
| US7506987B2 (en) | 2007-03-02 | 2009-03-24 | Technology Solutions & Invention Llc | Two-sided corner-cube retroreflectors and methods of manufacturing the same |
| EP2484797A1 (en) * | 2011-02-03 | 2012-08-08 | RC Tritec AG | Luminescent object |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4181753A (en) * | 1976-08-19 | 1980-01-01 | Brown, Boveri & Cie Aktiengesellschaft | Process for the production of electroluminescent powders for display panels and coating the powders with zinc phosphate |
| WO1988004467A1 (en) * | 1986-12-12 | 1988-06-16 | Appelberg Gustaf T | Electroluminescent panel lamp and method for manufacturing |
| US4902567A (en) * | 1987-12-31 | 1990-02-20 | Loctite Luminescent Systems, Inc. | Electroluminescent lamp devices using monolayers of electroluminescent materials |
| JPH08148278A (en) * | 1994-03-25 | 1996-06-07 | Takashi Hirate | El apparatus |
| JPH09129372A (en) * | 1995-11-01 | 1997-05-16 | Toshiba Corp | Manufacture of el element |
-
1997
- 1997-05-19 JP JP9128626A patent/JPH10335064A/en active Pending
-
1998
- 1998-03-27 CA CA002289085A patent/CA2289085A1/en not_active Abandoned
- 1998-03-27 CN CN98805242A patent/CN1257641A/en active Pending
- 1998-03-27 EP EP98913220A patent/EP0992177A1/en not_active Withdrawn
- 1998-03-27 AU AU67824/98A patent/AU6782498A/en not_active Abandoned
- 1998-03-27 WO PCT/US1998/006119 patent/WO1998053645A1/en not_active Application Discontinuation
- 1998-03-27 BR BR9809125-5A patent/BR9809125A/en not_active Application Discontinuation
- 1998-03-27 KR KR1019997010652A patent/KR20010012691A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425103C (en) * | 2001-03-29 | 2008-10-08 | 富士胶片株式会社 | Electrolumine scence device |
| CN101682099B (en) * | 2007-05-30 | 2014-04-16 | 日本电气硝子株式会社 | Laminate and solar battery using the laminate |
| CN106793354A (en) * | 2016-11-21 | 2017-05-31 | 万峰 | A kind of luminous paint system |
| CN110637345A (en) * | 2017-09-19 | 2019-12-31 | 株式会社Lg化学 | Electrode substrate for transparent light emitting device display and method of manufacturing the same |
| CN110637345B (en) * | 2017-09-19 | 2021-10-29 | 株式会社Lg化学 | Electrode substrate for transparent light emitting device display and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010012691A (en) | 2001-02-26 |
| JPH10335064A (en) | 1998-12-18 |
| AU6782498A (en) | 1998-12-11 |
| CA2289085A1 (en) | 1998-11-26 |
| WO1998053645A1 (en) | 1998-11-26 |
| EP0992177A1 (en) | 2000-04-12 |
| BR9809125A (en) | 2000-08-01 |
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