CN111261792B - Electroluminescent device - Google Patents
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- CN111261792B CN111261792B CN202010032793.0A CN202010032793A CN111261792B CN 111261792 B CN111261792 B CN 111261792B CN 202010032793 A CN202010032793 A CN 202010032793A CN 111261792 B CN111261792 B CN 111261792B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
Abstract
The present invention relates to an electroluminescent device. The electroluminescent device comprises an electron emission layer, wherein the electron emission layer is made of conductive silver paste, and the conductive silver paste is formed by mixing a mixture of silver nano particles and silver nano wires with a high polymer material; the energy storage reflecting layer is attached to the electron emission layer; the electronic excitation layer is attached to the energy storage reflecting layer; an electron recovery layer attached to the electron excitation layer; the first electrode is attached to the electron emission layer, and the second electrode is attached to the electron recovery layer. The electroluminescent device is a low-voltage electroluminescent device, and the potential safety hazard of the electroluminescent device can be reduced within the safe voltage range of a human body by operating voltage, so that the application field is widened.
Description
Technical Field
The present invention relates to an electroluminescent device, and more particularly, to a low voltage electroluminescent device.
Background
Electroluminescent devices are receiving more and more attention due to their advantages of high flexibility, light weight, low power consumption, and fast response speed. However, the direct driving voltage of the electroluminescent device is generally AC 60 v-150v, which is easy to age the material and form a breakdown point, greatly affecting the product life. And because the driving voltage is far higher than the safety voltage of a human body, the driving voltage has larger electric shock potential safety hazard when being applied, and the application of the driving voltage in products which are in close contact with the human body is seriously limited.
For this reason, there is a need in the art for an electroluminescent device that can be driven at a lower voltage.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the present invention, there is provided an electroluminescent device comprising: the electron emission layer is made of conductive silver paste, and the conductive silver paste is formed by mixing a mixture of silver nano particles and silver nano wires with a high polymer material; the energy storage reflecting layer is attached to the electron emission layer; the electronic excitation layer is attached to the energy storage reflecting layer; an electron recovery layer attached to the electron excitation layer; and a first electrode and a second electrode, the electron emission layer being attached to the first electrode, the second electrode being attached to the electron recovery layer.
In one example, the electron emission layer is made of the conductive silver paste by coating, printing, or electroplating.
In one example, the sheet resistance of the conductive silver paste is less than or equal to 10 -4 Ω。
In one example, the energy storage reflecting layer comprises a thin film layer formed by compounding a high polymer material and reflecting ceramic micro powder.
In one example, the polymer material of the energy storage and light reflection layer comprises one or more of epoxy resin, phenolic resin, acrylate and polyurethane.
In one example, the reflective ceramic micro powder comprises a mixture of one or more of crystalline barium sulfate, crystalline barium carbonate, crystalline barium titanate, strontium titanate doped with copper oxide.
In one example, the electron excitation layer includes a thin film layer formed by compounding a polymer material and a fluorescent material microcapsule.
In one example, the high molecular material of the electron excitation layer comprises modified epoxy resin with the transmittance of 99% or more, polyacrylate, polyurethane or one or more mixtures.
In one example, the fluorescent material microcapsule includes mixture particles of sulfide and rare earth having a particle diameter of 1 μm to 100 μm.
In one example, the electron recycling layer includes a sheet resistance value of 3 × 10 or less -2 Omega transparent conductive layer.
In one example, the electron emission layer, the energy storage reflective layer, the electron excitation layer and the electron recovery layer are assembled by silk screen printing, and the thickness of each layer is 0.01mm-0.03mm.
In one example, the electroluminescent device is linear, the energy storage reflective layer covers the electron emission layer, the electron excitation layer covers the energy storage reflective layer, and the electron recovery layer covers the electron excitation layer.
In one example, the electroluminescent device further comprises a central electrode, an outer electrode, and a protective layer, wherein the electron emission layer covers the central electrode, the outer electrode is coupled to the electron recycling layer, and the protective layer covers the electron recycling layer and the outer electrode.
In one example, the electroluminescent device is planar.
In one example, the electroluminescent device further comprises a first encapsulation protection layer and a second encapsulation protection layer, the first encapsulation protection layer and the second encapsulation protection layer respectively covering the first electrode and the second electrode.
The scheme provides a safe voltage-driven, ultrathin and long-life electroluminescent product and device by improving the materials of all functional coatings of the electroluminescent device. The conventional working voltage of the electroluminescent product provided by the invention is AC 5V-36V, and the electroluminescent product can work in a human body safety voltage range. The frequency is 100-20000HZ, and the luminance range is 20cd-100cd/m 2 . On the other hand, the electroluminescent device of the invention can resist high voltage, when the electroluminescent device works at AC 36v-150v, the brightness of the electroluminescent device is higher than that of the conventional product, and can reach 100cd-200cd/m 2 Is higher than the same voltageThe brightness of the frequency-driven conventional product is improved by 10-20%.
Due to the fact that low-voltage alternating current is adopted for driving, the aging period of the luminescent material is greatly delayed, and the service life of the luminescent product is prolonged by more than 30%. The product is more energy-saving, the potential safety hazard of high-voltage driving of the product is eliminated, the application range of the product is greatly expanded, and the product is particularly suitable for application in scenes with high requirements on safety and light-emitting service life.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
Fig. 1 shows a block diagram of a low voltage electroluminescent device according to an aspect of the present invention; and
fig. 2 shows a block diagram of a low voltage electroluminescent device according to another aspect of the invention.
Reference numerals
100. 200: electroluminescent device
110. 210: electron emission layer
120. 220, and (2) a step of: energy storage reflecting layer
130. 230: electron excitation layer
140. 240: electron recovery layer
1501: a first electrode
1502: second electrode
2501: center electrode
2502: external electrode
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
Fig. 1 shows a block diagram of a low voltage electroluminescent device 100 according to an aspect of the present invention. The low voltage electroluminescent device 100 shown in fig. 1 is planar.
The conventional working voltage of the low-voltage electroluminescent device 100 is AC 5V-36V, and the low-voltage electroluminescent device can be used for electroluminescent products which can work in a human body safety voltage range, so that the safety is greatly improved. Due to the fact that low-voltage alternating current is adopted for driving, the aging period of the luminescent material is greatly delayed, and the service life of the luminescent product is prolonged by more than 30%. The product is more energy-saving, eliminates the potential safety hazard of higher voltage drive, greatly widens the application range, and is particularly suitable for the application of scenes with higher requirements on safety and luminous life.
As shown in fig. 1, the electroluminescent device 100 may include an electron emission layer 110, an energy-storing light-reflecting layer 120, an electron excitation layer 130, and an electron recovery layer 140. Specifically, the energy-storing reflecting layer 120 is seamlessly and uniformly attached to the electron emission layer 110, the electron excitation layer 130 is seamlessly and uniformly attached to the energy-storing reflecting layer 120, and the electron recovery layer 140 is seamlessly and uniformly attached to the electron excitation layer 130.
The electron emission layer 110 may be made of a high-conductivity material, and particularly, may be made of a silver paste of high conductivity. In particular, in order to reduce the operating voltage of the electroluminescent device 100, the high conductivity silver paste of the present invention may be formed by mixing a mixture of silver nanoparticles and silver nanowires with a polymer material.
The traditional conductive paste is mainly formed by compounding nano silver particles and macromolecules, and the conductive efficiency of the prepared paste does not reach the expected value due to the insulating effect of the macromolecules, so that the resistance of the paste is high, partial voltage is shared, the voltage at the end of a light-emitting device is reduced, and the brightness is low.
The conductive silver paste of the scheme is mainly formed by mixing silver nanoparticles and silver nanowires, so that the insulating effect of a polymer on the silver particles is reduced, the conductive efficiency of the conductive paste is greatly improved, the brightness of a light-emitting device is improved, and the purpose of low-voltage light emission is achieved. In this case, the sheet resistance of the high-conductivity silver paste is less than 10 by using the mixture of the silver nanoparticles and the silver nanowires as the main component -4 Ω。
The silver nanowire is a nano-scale wire with transverse diameter less than 100 nm and unlimited longitudinal length and has excellent conductivity. In the scheme, the silver nanowires and the nano silver particles are mixed by a physical method, and the nano silver particles are filled among the nanowires, so that the conductivity is greatly improved.
The energy storing and light reflecting layer 120 may be attached to the electron emission layer 110. The energy storage reflecting layer 120 is an ultrathin layer formed by compounding a high-transmission low-resistance polymer material and superfine and high-purity reflecting ceramic micro powder, and has excellent capability of storing electrons and reflecting light.
The light transmittance of the high-transmittance low-resistance polymer material is higher than 99%, and the sheet resistance is less than or equal to 10 omega. Preferably, the polymer material may include one or more of thermosetting high transparent epoxy resin, phenolic resin, acrylate, polyurethane, etc. The materials have good transparency and high electron storage capacity, and are favorable for uniform arrangement of the reflective ceramic micro powder crystals according to a certain sequence in the film forming process.
The purity of the high-purity reflective ceramic micro powder can be more than 99.3%. Preferably, the high-purity reflective ceramic micropowder may include high-purity crystalline barium sulfate, high-purity crystalline barium carbonate, high-purity crystalline barium titanate, srTiO 3 One or more of them is doped with CuO in a certain proportion, so that it possesses high dielectric constant (for example, 2X 10) 5 ) To provide ultra-high dielectric properties. The dielectric loss of the high-purity reflective ceramic micro powder is less than or equal to 0.5 percent, so that a large amount of electrons can be stored during low-voltage driving and can be used for exciting an electron excitation material to generate energy level transition to release photons.
The electron excitation layer 130 may include an ultra-thin film layer formed by combining a super-transparent polymer material and a fluorescent material microcapsule. The super-transparent high polymer material can comprise one or a mixture of more of modified epoxy resin, polyacrylate, polyurethane and the like, the polymer has low resistance, and the light transmittance can be higher than 99%.
The fluorescent material microcapsule is a mixture of sulfide and rare earth, and can be formed by sintering at 1000-1200 ℃ and has a particle size of 1-100 μm. Here, rare earth as an excitation factor can reduce the transition resistance of the material, so that the material can undergo transition at low voltage to emit light.
The electron recycling layer 140 may include a square resistance value of 3 × 10 or less -2 Omega transparent conductive layer. In one example, the electron recycling layer 140 can be made of a high-transparency, ultra-thin transparent conductive paste coating, printing, evaporation coating, or an ultra-thin high-transparency conductive gauze or transparent metal grid closely covered.
The material composition and properties of the main functional layers of the electroluminescent device 100 are described above. In one example, the layers may be assembled by screen printing, the layers having a thickness of 0.01-0.03mm. In other examples, the layers may be assembled by various processes such as spraying, electroplating, printing, and the like.
The electroluminescent device 100 may further include electrodes for conducting electricity, such as a first electrode 1501 and a second electrode 1502, the first electrode 1501 may be coupled to the electron emission layer 110, and the second electrode 1502 may be coupled to the electron recovery layer 140. In the example shown in fig. 1, the first electrode 1501 and the electrode 1502 may be metal conductive layers attached to the surfaces of the electron emission layer 110 and the electron recovery layer 140.
In an example, the electroluminescent device 100 may further include an encapsulation protective layer (not shown in the figure), and specifically may include a first encapsulation protective layer and a second encapsulation protective layer covering the first electrode and the second electrode, respectively. The packaging protective layer is an insulating, moisture-proof and wear-resistant thin layer with a certain thickness formed by polyurethane, epoxy resin, polyacrylate and the like.
Fig. 2 shows a block diagram of a low voltage electroluminescent device 200 according to another aspect of the invention.
As shown in fig. 2, the electroluminescent device 200 may include an electron emission layer 210, an energy storage light reflection layer 220, an electron excitation layer 230, and an electron recovery layer 240. Specifically, the energy storage reflecting layer 220 is seamlessly and uniformly attached to the electron emission layer 210, the electron excitation layer 230 is seamlessly and uniformly attached to the energy storage reflecting layer 220, and the electron recovery layer 240 is seamlessly and uniformly attached to the electron excitation layer 230.
As shown in fig. 2, the low voltage electroluminescent device 200 is in the form of a wire, which may be in the form of a light emitting yarn. The electroluminescent device 200 may comprise a central electrode 2501 and an outer electrode 2502 for conducting electricity. The electron emission layer 210 may surround the central electrode 2501, the energy-storing reflective layer 220 may be coated outside the electron emission layer 210, the electron excitation layer 230 may be coated outside the energy-storing reflective layer 220, and the electron recovery layer 240 may be coated outside the electron excitation layer 230.
In one example, the low voltage electroluminescent device 200 may further include a protective layer 260 tightly covering the central electrode 2501, the electron emission layer 210, the energy storage reflective layer 220, the electron excitation layer 230, the electron recycling layer 240, and the outer electrode 2502. The encapsulation protection layer 260 may be polyurethane, epoxy, polyacrylate, etc. formed into an insulating, moisture-proof, wear-resistant thin layer having a certain thickness.
The central electrode 2501 and the outer electrode 2502 may be ultra-fine metal wires (copper wires, stainless steel wires, aluminum wires, etc.), organic or inorganic polymer-based silver-plated, copper, nickel, etc. conductive wires, and the like.
The electron emission layer 210 may be made of a high-conductivity material, and particularly, may be made of a silver paste of high conductivity. In particular, in order to reduce the operating voltage of the electroluminescent device 200, the high conductivity silver paste of the present invention may be formed by mixing a mixture of silver nanoparticles and silver nanowires with a polymer material.
The traditional conductive paste is mainly formed by compounding nano silver particles and macromolecules, and the conductive efficiency of the prepared paste does not reach the expected value due to the insulating effect of the macromolecules, so that the resistance of the paste is high, partial voltage is shared, the voltage at the end of a light-emitting device is reduced, and the brightness is low.
The conductive silver paste of the scheme is mainly formed by mixing the silver nanoparticles and the silver nanowires, so that the insulating effect of a polymer on the silver particles is reduced, the conductive efficiency of the conductive paste is greatly improved, the brightness of a light-emitting device is further improved, and the purpose of low-voltage light emission is achieved. In this case, the sheet resistance of the high-conductivity silver paste is 10 or less by using a mixture of silver nanoparticles and silver nanowires as a main component -4 Ω。
The silver nanowire is a nano-scale wire with transverse diameter less than 100 nm and unlimited longitudinal length and has excellent conductivity. In the scheme, the silver nanowires and the nano silver particles are mixed by a physical method, and the nano silver particles are filled among the nanowires, so that the conductivity is greatly improved.
The energy storing light reflecting layer 220 may be attached to the electron emission layer 210. The energy storage reflecting layer 220 is an ultrathin layer formed by compounding a high-transmission low-resistance polymer material and superfine and high-purity reflecting ceramic micro powder, and has excellent capability of storing electrons and reflecting light.
The light transmittance of the high-transmittance low-resistance polymer material is higher than 99%, and the sheet resistance is less than or equal to 10 omega. Preferably, the polymer material may include one or more of thermosetting high transparent epoxy resin, phenolic resin, acrylate, polyurethane, etc. The materials have good transparency and high electron storage capacity, and are favorable for uniform arrangement of the reflective ceramic micro powder crystals according to a certain sequence in the film forming process.
The purity of the high-purity reflective ceramic micro powder can be more than 99.3%. Preferably, the high-purity reflective ceramic micropowder may include high-purity crystalline barium sulfate, high-purity crystalline barium carbonate, high-purity crystalline barium titanate, strontium titanate (SrTiO) 3 ) One or more of them is doped with CuO in a certain proportion, so that it possesses high dielectric constant (for example, 2X 10) 5 ) To provide ultra-high dielectric properties. The dielectric loss of the high-purity reflective ceramic micro powder is less than or equal to 0.5 percent, so that a large amount of electrons can be stored in low-voltage driving and the high-purity reflective ceramic micro powder is used for exciting an electron excitation material to generate energy level transition to release photons.
The electron excitation layer 230 may include an ultra-thin film layer formed by combining an ultra-transparent polymer material and a fluorescent material microcapsule. The super-transparent high polymer material can comprise one or a mixture of more of modified epoxy resin, polyacrylate, polyurethane and the like, the polymer has low resistance, and the light transmittance can be higher than 99%.
The fluorescent material microcapsule is a mixture of sulfide and rare earth, and can be formed by sintering at 1000-1200 ℃ and has a particle size of 1-100 μm. Here, rare earth as an excitation factor can reduce the transition resistance of the material, so that the material can undergo transition at low voltage to emit light.
The electron recycling layer 240 may include a sheet resistance value of less than or equal to3×10 -2 Omega transparent conductive layer. In one example, the electron recycling layer 240 can be made of a high-transparency, ultra-thin transparent conductive paste coating, printing, evaporation coating, or an ultra-thin high-transparency conductive gauze or transparent metal grid closely covered.
The material composition and properties of the main functional layers of the electroluminescent device 200 are described above. In one embodiment, the functional coatings can be attached to the center electrode by printing, encapsulating, spraying, etc., and then combined with the outer electrode.
In the scheme, by improving the materials of all functional coatings of the electroluminescent device, a safe voltage-driven ultrathin long-life electroluminescent product and device are provided. The conventional working voltage of the electroluminescent product provided by the invention is AC 5V-36V, and the electroluminescent product can work in a human body safety voltage range. The frequency is 100-20000HZ, and the luminance range is 20cd-100cd/m 2 . On the other hand, the electroluminescent device of the invention can resist high voltage, when the electroluminescent device works at AC 36v-150v, the brightness of the electroluminescent device is higher than that of the conventional product and can reach 100cd-200cd/m 2 Compared with the conventional product driven by the same voltage frequency, the brightness is improved by 10-20%.
Due to the fact that low-voltage alternating current is adopted for driving, the aging period of the luminescent material is greatly delayed, and the service life of the luminescent product is prolonged by more than 30%. The product is more energy-saving, the potential safety hazard of high-voltage driving of the product is eliminated, the application range of the product is greatly expanded, and the product is particularly suitable for application in scenes with high requirements on safety and light-emitting service life.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. An electroluminescent device, comprising: the electron emission layer is made of conductive silver paste, and the conductive silver paste is formed by mixing a mixture of silver nano particles and silver nano wires with an insulating high polymer material; the energy storage reflecting layer is attached to the electron emission layer and used for storing electrons and reflecting light; the electronic excitation layer is attached to the energy storage reflecting layer; an electron recovery layer attached to the electron excitation layer; and the first electrode and the second electrode, the electron emission layer is attached to the first electrode, the second electrode is attached to the electron recovery layer, and the electroluminescent device is planar.
2. An electroluminescent device as claimed in claim 1, wherein said electron emission layer is made of said conductive silver paste by coating, printing or electroplating.
3. The electroluminescent device of claim 1, wherein the sheet resistance of the conductive silver paste is 10 or less -4 Ω。
4. The device of claim 1, wherein the energy-storing and light-reflecting layer comprises a thin film layer formed by compounding a polymer material and a light-reflecting ceramic micropowder.
5. An electroluminescent device as claimed in claim 4, wherein the polymeric material of the energy storing light reflecting layer comprises one or more of epoxy, phenolic, acrylate, polyurethane.
6. An electroluminescent device as claimed in claim 4, wherein the reflective ceramic micro powder comprises a mixture of one or more of crystalline barium sulfate, crystalline barium carbonate, crystalline barium titanate, strontium titanate doped with copper oxide.
7. The electroluminescent device of claim 1, wherein said electron excitation layer comprises a thin film layer formed by combining a polymer material and a fluorescent material microcapsule.
8. An electroluminescent device as claimed in claim 7, wherein the polymer material of the electron excitation layer comprises a modified epoxy resin, polyacrylate, polyurethane or a mixture of one or more thereof having a transmittance of 99% or more.
9. An electroluminescent device as claimed in claim 7, wherein the fluorescent material microcapsule comprises particles of a mixture of sulfide and rare earth having a particle diameter of 1 μm to 100 μm.
10. An electroluminescent device as claimed in claim 1, wherein the electron-withdrawing layer comprises a sheet resistance of 3 x 10 or less -2 Omega transparent conductive layer.
11. An electroluminescent device as claimed in any one of claims 1 to 10, wherein the electron emission layer, the energy storing light reflecting layer, the electron excitation layer and the electron recovery layer are each assembled by screen printing, each layer having a thickness of 0.01mm to 0.03mm.
12. An electroluminescent device as claimed in any one of claims 1 to 10, further comprising first and second encapsulating protective layers covering the first and second electrodes respectively.
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