CN111261792B - Electroluminescent device - Google Patents

Abstract

The invention relates to an electroluminescence device. The electroluminescent device includes an electron emission layer, which is made of conductive silver paste, which is mixed with a mixture of silver nanoparticles and silver nanowires and polymer materials; an energy storage reflective layer, attached to the The electron emission layer; the electron excitation layer is attached to the energy storage reflective layer; the electron recovery layer is 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 electroluminescence device of the present invention is a low-voltage electroluminescence device, and the operating voltage is within the safe voltage range of the human body, which can reduce the potential safety hazard of the electroluminescence device and broaden the application field.

Description

Electroluminescent device

technical field

The invention relates to an electroluminescent device, in particular to a low-voltage electroluminescent device.

Background technique

Electroluminescent devices have attracted more and more attention due to their advantages of high flexibility, light weight, low energy consumption and fast response. However, the direct driving voltage of the electroluminescent device is relatively high, generally AC 60 volts to 150 volts, which is easy to age the material and form a breakdown point, which greatly affects the product life. Moreover, since the driving voltage is much higher than the safe voltage of the human body, there is a large potential safety hazard of electric shock during application, which seriously limits its application in products that are in close contact with the human body.

For this reason, there is an urgent need in the art for an electroluminescent device that can be driven at a lower voltage.

Contents of the invention

A brief summary of one or more aspects is presented below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all contemplated aspects and is intended to neither identify key or critical elements of all aspects nor attempt to 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 one aspect of the present invention, an electroluminescent device is provided, comprising: an electron emission layer, the electron emission layer is made of conductive silver paste, and the conductive silver paste is made of a mixture of silver nanoparticles and silver nanowires and The energy storage reflective layer is attached to the electron emission layer; the electron excitation layer is attached to the energy storage reflective layer; the electron recovery layer is attached to the electron excitation layer; and the first electrode and the A second electrode, the electron emission layer is attached to the first electrode, and the second electrode is 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 square resistance of the conductive silver paste is less than or equal to 10 ⁻⁴ Ω.

In one example, the energy-storing light-reflecting layer includes a film layer composed of polymer materials and light-reflecting ceramic micropowders.

In one example, the polymer material of the energy storage reflective layer includes one or more mixtures of epoxy resin, phenolic resin, acrylate, and polyurethane.

In one example, the reflective ceramic fine powder includes a mixture of one or more of crystalline barium sulfate, crystalline barium carbonate, crystalline barium titanate, and strontium titanate doped with copper oxide.

In one example, the electron excitation layer includes a film layer composed of polymer materials and fluorescent material microcapsules.

In one example, the polymer material of the electron excitation layer includes modified epoxy resin, polyacrylate, polyurethane or one or more mixtures with a light transmittance greater than or equal to 99%.

In one example, the fluorescent material microcapsules include mixture particles of sulfide and rare earth with a particle size of 1 μm-100 μm.

In an example, the electron recycling layer includes a transparent conductive layer with a square resistance value less than or equal to 3×10 ⁻² Ω.

In one example, the electron emission layer, the energy storage light-reflecting layer, the electron excitation layer and the electron recovery layer are each assembled by silk screen printing, and the thickness of each layer is 0.01mm-0.03mm.

In one example, the electroluminescent device is in the shape of a line, 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 includes a central electrode, an external electrode, and a protective layer, the electron emission layer covers the central electrode, the external electrode is coupled to the electron recovery layer, and the protective layer layer covering the electron recycling layer and the external electrode.

In one example, the electroluminescent device is planar.

In an example, the electroluminescent device further includes a first encapsulation protection layer and a second encapsulation protection layer, the first encapsulation protection layer and the second encapsulation protection layer respectively cover the first electrode and the second electrode.

This case provides a safe voltage-driven, ultra-thin, high-life electroluminescent product and device through the improvement of the materials of the various functional coatings of the electroluminescent device. The conventional working voltage of the electroluminescent product provided by the invention is AC5V-36V, which can work within the safe voltage range of the human body. The frequency ranges from 100-20000HZ, and the brightness ranges from 20cd-100cd/m ² . On the other hand, the electroluminescent device of the present invention can withstand high voltage. When working at AC 36v-150v, its brightness is higher than that of conventional products, up to 100cd-200cd/m ² , which is higher than that of conventional products driven by the same voltage frequency 10-20%.

Due to the low-voltage AC drive, the aging cycle of the luminescent material is greatly delayed, and the life of the luminescent product is increased by more than 30%. It makes the product more energy-saving, eliminates the potential safety hazard of its higher voltage drive, and greatly broadens its application range, especially suitable for applications that require high safety and luminous life.

Description of drawings

The above-mentioned features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components with similar related properties or characteristics may have the same or similar reference numerals.

Figure 1 shows a structural diagram of a low voltage electroluminescent device according to an aspect of the present invention; and

Fig. 2 shows a structural diagram of a low voltage electroluminescent device according to another aspect of the present invention.

reference sign

100, 200: electroluminescent devices

110, 210: electron emission layer

120, 220: energy storage reflective layer

130, 230: electron excitation layer

140, 240: Electronic recycling layer

1501: first electrode

1502: second electrode

2501: Center Electrode

2502: External electrode

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the drawings and specific embodiments are only exemplary, and should not be construed as limiting the protection scope of the present invention.

Fig. 1 shows a structural diagram of a low voltage electroluminescent device 100 according to one 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 in this case is AC 5V-36V, and the electroluminescent product can work within the safe voltage range of the human body, which greatly improves the safety. Due to the low-voltage AC drive, the aging cycle of the luminescent material is greatly delayed, and the life of the luminescent product is increased by more than 30%. It makes the product more energy-saving, eliminates the potential safety hazard of its higher voltage drive, and greatly broadens its application range, especially suitable for applications that require high safety and luminous life.

As shown in FIG. 1 , the electroluminescent device 100 may include an electron emission layer 110 , an energy storage light-reflecting layer 120 , an electron excitation layer 130 and an electron recovery layer 140 . Specifically, the energy storage reflective 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 storage reflective layer 120, and the electron recovery layer 140 is seamlessly and uniformly attached to the electron excitation layer. 130 on.

The electron emission layer 110 may be made of a high-conductivity material, specifically, a high-conductivity silver paste. In particular, in order to reduce the operating voltage of the electroluminescent device 100, the high-conductivity silver paste of the present invention can be formed by mixing a mixture of silver nanoparticles and silver nanowires with a polymer material.

The traditional conductive paste is mainly composed of nano-silver particles and polymers. Due to the insulating effect of polymers, the conductive efficiency of the prepared paste does not reach the expected value, which makes the resistance of the paste itself relatively large, sharing part of the voltage and making it luminous. The voltage at the device terminal becomes smaller and the brightness is lower.

The conductive silver paste in this case is mainly composed of silver nanoparticles and silver nanowires, which reduces the insulating effect of the polymer on the silver particles, greatly improves the conductive efficiency of the conductive paste, and improves the brightness of the light-emitting device. Glowing purpose. In this case, by using a mixture of silver nanoparticles and silver nanowires as the main component, the square resistance of the high conductivity silver paste is less than 10 ^-4 Ω.

Silver nanowire is a nanoscale wire with a lateral diameter of less than 100 nanometers and unlimited longitudinal length with excellent electrical conductivity. In this case, by physically mixing the silver nanowires and nano-silver particles, the nano-silver particles are filled between the nanowires, which greatly improves the conductivity.

The energy storage reflective layer 120 can be attached to the electron emission layer 110 . The energy-storage reflective layer 120 is an ultra-thin film layer composed of high-transmittance and low-resistance polymer material and ultra-fine, high-purity reflective ceramic micropowder, which has excellent ability to store electrons and reflect light.

The light transmittance of the high-transmittance and low-resistance polymer material here is higher than 99%, and the square resistance is less than or equal to 10Ω. Preferably, the polymer material here may include one or a mixture of thermosetting highly transparent epoxy resin, phenolic resin, acrylate, polyurethane, etc. These materials have good transparency and high ability to store electrons, and the process of film formation is conducive to the uniform arrangement of reflective ceramic micropowder crystals in a certain order.

The purity of high-purity reflective ceramic micropowder can be greater than 99.3%. Preferably, the high-purity reflective ceramic powder can include high-purity crystalline barium sulfate, high-purity crystalline barium carbonate, high-purity crystalline barium titanate, and a mixture of one or more of SrTiO ₃ doped with CuO in a certain proportion, so as to have Higher dielectric constant (eg, 2×10 ⁵ ) to provide ultra-high dielectric properties. Here, the dielectric loss of the high-purity reflective ceramic micropowder is ≤0.5%, which can ensure that a large amount of electrons are stored when driven at low voltage, and are used to excite electrons to excite materials to undergo energy level transitions and release photons.

The electron excitation layer 130 may include an ultra-thin film layer composed of ultra-transparent polymer materials and fluorescent material microcapsules. The ultra-transparent polymer material here may include one or a mixture of modified epoxy resin, polyacrylate, polyurethane, etc., the polymer has low resistance and the light transmittance can be higher than 99%.

Here, the fluorescent material microcapsule is a mixture doped with sulfide and rare earth, which can be sintered at a high temperature of 1000-1200 degrees Celsius, and the particle size is 1 μm-100 μm. Here, the rare earth as an excitation factor can reduce the transition resistance of the material, so that the material can undergo a transition under low pressure and emit light.

The electron recycling layer 140 may include a transparent conductive layer with a square resistance value less than or equal to 3×10 ⁻² Ω. In one example, the electron recycling layer 140 can be formed by coating, printing, or evaporating high-transparency, ultra-thin transparent conductive paste, or closely covered by ultra-thin highly transparent conductive gauze or transparent metal grid.

The material composition and characteristics of each main functional layer of the electroluminescent device 100 are described above. In one example, each layer can be assembled by silk screen printing, and the thickness of each layer is 0.01-0.03 mm. In other examples, various layers can also be assembled by spraying, electroplating, printing and other various processes.

The electroluminescent device 100 can also include electrodes for conducting electricity, such as a first electrode 1501 and a second electrode 1502, the first electrode 1501 can be coupled to the electron emission layer 110, and the second electrode 1502 can 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 encapsulation protection layers (not shown in the figure), specifically may include a first encapsulation protection layer and a second encapsulation protection layer covering the first electrode and the second electrode. . The encapsulation protective layer is made of polyurethane, epoxy resin, polyacrylate, etc. to form an insulating, moisture-proof and wear-resistant thin layer with a certain thickness.

Fig. 2 shows a structural diagram of a low voltage electroluminescent device 200 according to another aspect of the present invention.

As shown in FIG. 2 , the electroluminescent device 200 may include an electron emission layer 210 , an energy storage light-reflecting layer 220 , an electron excitation layer 230 and an electron recovery layer 240 . Specifically, the energy storage reflective 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 reflective layer 220, and the electron recovery layer 240 is seamlessly and uniformly attached to the electron excitation layer. 230 on.

As shown in FIG. 2 , the low-voltage electroluminescent device 200 is in the shape of a line, which may be in the form of a luminescent yarn. The electroluminescence device 200 may include a central electrode 2501 and an outer electrode 2502 for conducting electricity. The electron emission layer 210 can surround the central electrode 2501, the energy storage reflective layer 220 can be coated outside the electron emission layer 210, the electron excitation layer 230 can be coated outside the energy storage light reflection layer 220, and the electron excitation layer 230 can be coated Electron recycling layer 240 .

In one example, the low-voltage electroluminescent device 200 can also include a protective layer 260, which tightly covers the central electrode 2501, the electron emission layer 210, the energy storage reflective layer 220, the electron excitation layer 230, the electron recovery layer 240 and the outer electrode 2502 together. The encapsulation protection layer 260 may be polyurethane, epoxy resin, polyacrylate, etc. to form an insulating, moisture-proof and wear-resistant thin layer with a certain thickness.

The central electrode 2501 and the outer electrode 2502 can be ultra-fine metal wires (copper wires, stainless steel wires, aluminum wires, etc.), organic or inorganic polymer-based conductive wires plated with silver, copper, nickel, etc.

The electron emission layer 210 may be made of high-conductivity material, specifically, high-conductivity silver paste. In particular, in order to reduce the operating voltage of the electroluminescent device 200, the high-conductivity silver paste of the present invention can be formed by mixing a mixture of silver nanoparticles and silver nanowires with a polymer material.

The traditional conductive paste is mainly composed of nano-silver particles and polymers. Due to the insulating effect of polymers, the conductive efficiency of the prepared paste does not reach the expected value, which makes the resistance of the paste itself relatively large, sharing part of the voltage and making it luminous. The voltage at the device terminal becomes smaller and the brightness is lower.

The conductive silver paste in this case is mainly composed of silver nanoparticles and silver nanowires, which reduces the insulating effect of the polymer on the silver particles, greatly improves the conductive efficiency of the conductive paste, and improves the brightness of the light-emitting device. Glowing purpose. In this case, by using a mixture of silver nanoparticles and silver nanowires as the main component, the square resistance of the high-conductivity silver paste is less than or equal to 10 ^-4 Ω.

Silver nanowire is a nanoscale wire with a lateral diameter of less than 100 nanometers and unlimited longitudinal length with excellent electrical conductivity. In this case, by physically mixing the silver nanowires and nano-silver particles, the nano-silver particles are filled between the nanowires, which greatly improves the conductivity.

The energy storage reflective layer 220 can be attached to the electron emission layer 210 . The energy-storage reflective layer 220 is an ultra-thin film layer composed of high-transmittance and low-resistance polymer material and ultra-fine, high-purity reflective ceramic micropowder, which has excellent ability to store electrons and reflect light.

The light transmittance of the high-transmittance and low-resistance polymer material here is higher than 99%, and the square resistance is less than or equal to 10Ω. Preferably, the polymer material here may include one or a mixture of thermosetting highly transparent epoxy resin, phenolic resin, acrylate, polyurethane, etc. These materials have good transparency and high ability to store electrons, and the process of film formation is conducive to the uniform arrangement of reflective ceramic micropowder crystals in a certain order.

The purity of high-purity reflective ceramic micropowder can be greater than 99.3%. Preferably, the high-purity reflective ceramic powder may include one or more of high-purity crystalline barium sulfate, high-purity crystalline barium carbonate, high-purity crystalline barium titanate, strontium titanate (SrTiO ₃ ) doped with CuO in a certain proportion , so as to have a higher dielectric constant (for example, 2×10 ⁵ ) to provide ultra-high dielectric properties. Here, the dielectric loss of the high-purity reflective ceramic micropowder is ≤0.5%, which can ensure that a large amount of electrons are stored when driven at low voltage, and are used to excite electrons to excite materials to undergo energy level transitions and release photons.

The electron excitation layer 230 may include an ultra-thin film layer composed of ultra-transparent polymer materials and fluorescent material microcapsules. The ultra-transparent polymer material here may include one or a mixture of modified epoxy resin, polyacrylate, polyurethane, etc., the polymer has low resistance and the light transmittance can be higher than 99%.

Here, the fluorescent material microcapsule is a mixture doped with sulfide and rare earth, which can be sintered at a high temperature of 1000-1200 degrees Celsius, and the particle size is 1 μm-100 μm. Here, the rare earth as an excitation factor can reduce the transition resistance of the material, so that the material can undergo a transition under low pressure and emit light.

The electron recycling layer 240 may include a transparent conductive layer with a square resistance value less than or equal to 3×10 ⁻² Ω. In one example, the electron recycling layer 240 can be formed by coating, printing, or evaporating high-transparency, ultra-thin transparent conductive paste, or closely covered by ultra-thin highly transparent conductive gauze or transparent metal mesh.

The material composition and characteristics of each main functional layer of the electroluminescent device 200 are described above. In one example, the above-mentioned functional coatings can be fixed on the central electrode by printing, encapsulation, spraying and other methods, and then combined with the outer electrode.

In this case, by improving the material of each functional coating of the electroluminescent device, a safe voltage-driven, ultra-thin, long-life electroluminescent product and device is provided. The conventional working voltage of the electroluminescent product provided by the invention is AC 5V-36V, which can work within the safe voltage range of the human body. The frequency ranges from 100-20000HZ, and the brightness ranges from 20cd-100cd/m ² . On the other hand, the electroluminescent device of the present invention can withstand high voltage. When working at AC 36v-150v, its brightness is higher than that of conventional products, up to 100cd-200cd/m ² , which is higher than that of conventional products driven by the same voltage frequency 10-20%.

Due to the low-voltage AC drive, the aging cycle of the luminescent material is greatly delayed, and the life of the luminescent product is increased by more than 30%. It makes the product more energy-saving, eliminates the potential safety hazard of its higher voltage drive, and greatly broadens its application range, especially suitable for applications that require high safety and luminous life.

The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present 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 present 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 electroluminescence device, is characterized in that, comprises: electron emission layer, described electron emission layer is made of conductive silver paste, and described conductive silver paste is made of the mixture of silver nanoparticle and silver nanowire and high insulation Molecular materials are mixed; the energy storage reflective layer is attached to the electron emission layer for storing electrons and reflecting light; the electron excitation layer is attached to the energy storage reflective layer; the electron recovery layer is attached to the electron excitation layer. layer; and a first electrode and a 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 electroluminescence device according to claim 1, characterized in that, the electron emission layer is made of the conductive silver paste by coating, printing or electroplating. 3. An electroluminescent device according to claim 1, characterized in that the square resistance of the conductive silver paste is less than or equal to 10 ^-4 Ω. 4. An electroluminescence device as claimed in claim 1, characterized in that, the energy-storage light-reflecting layer comprises a film layer composed of polymer materials and light-reflecting ceramic micropowders. 5. A kind of electroluminescence device as claimed in claim 4, it is characterized in that, the polymer material of described energy storage reflective layer comprises one or more mixtures in epoxy resin, phenolic resin, acrylate, polyurethane . 6. A kind of electroluminescent device as claimed in claim 4, is characterized in that, described light-reflecting ceramic fine powder comprises one or more in crystalline barium sulfate, crystalline barium carbonate, crystalline barium titanate, strontium titanate and Copper oxide doped mixture. 7 . The electroluminescent device according to claim 1 , wherein the electron excitation layer comprises a film layer composed of macromolecule material and fluorescent material microcapsules. 8. A kind of electroluminescence device as claimed in claim 7, it is characterized in that, the macromolecular material of described electron excitation layer comprises the modified epoxy resin, polyacrylate, polyurethane or One or more mixtures. 9 . The electroluminescent device according to claim 7 , wherein the fluorescent material microcapsules comprise mixture particles of sulfide and rare earth with a particle size of 1 μm-100 μm. 10. The electroluminescent device according to claim 1, wherein the electron recycling layer comprises a transparent conductive layer with a square resistance value less than or equal to 3×10 ^-2 Ω. 11. A kind of electroluminescent device according to any one of claims 1-10, characterized in that, the electron emission layer, the energy storage reflective layer, the electron excitation layer and the electron recovery layer Each is assembled by silk screen printing, and the thickness of each layer is 0.01mm–0.03mm. 12. An electroluminescent device according to any one of claims 1-10, further comprising a first encapsulation protection layer and a second encapsulation protection layer, the first encapsulation protection layer and the The second encapsulation protection layer respectively covers the first electrode and the second electrode.

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