CN117279410A - Stretchable alternating current electroluminescent device based on ionic material - Google Patents

Stretchable alternating current electroluminescent device based on ionic material Download PDF

Info

Publication number
CN117279410A
CN117279410A CN202311098046.7A CN202311098046A CN117279410A CN 117279410 A CN117279410 A CN 117279410A CN 202311098046 A CN202311098046 A CN 202311098046A CN 117279410 A CN117279410 A CN 117279410A
Authority
CN
China
Prior art keywords
layer
stretchable
flexible
ionic
electroluminescent device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311098046.7A
Other languages
Chinese (zh)
Inventor
杨赓
叶知秋
王炳儒
杨华勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang University ZJU
Original Assignee
Zhejiang University ZJU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang University ZJU filed Critical Zhejiang University ZJU
Priority to CN202311098046.7A priority Critical patent/CN117279410A/en
Publication of CN117279410A publication Critical patent/CN117279410A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
    • C08J3/096—Nitrogen containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
    • C08J3/11—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids from solid polymers
    • 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
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • 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
    • H10K50/805—Electrodes
    • 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
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/60—Forming conductive regions or layers, e.g. electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/621—Providing a shape to conductive layers, e.g. patterning or selective deposition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/43—Compounds containing sulfur bound to nitrogen
    • C08K5/435—Sulfonamides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The invention discloses a stretchable alternating current electroluminescent device based on an ionic material. The device adopts a sandwich structure, the flexible luminous layer is positioned in an interlayer of the upper ion gel layer and the lower ion gel layer, silver nanowire layers are respectively sprayed on the outer surfaces of the upper ion gel layer and the lower ion gel layer, and external wires are arranged on the silver nanowire layers at two sides and used for connecting a power supply. The stretchable alternating current electroluminescent device body is composed of a flexible stretchable luminescent layer, a flexible stretchable electrode and a flexible stretchable encapsulation layer. The flexible stretchable luminescent layer consists of a flexible substrate, luminescent powder and nano ceramic particle barium titanate for enhancing luminous intensity, and the flexible stretchable electrode mainly consists of an ion gel film and silver nanowires. The stretchable alternating current electroluminescent device has the characteristics of uniform luminous effect, good stretching performance, high stability, high tolerance, small environmental hazard and the like.

Description

Stretchable alternating current electroluminescent device based on ionic material
Technical Field
The invention relates to a flexible light-emitting device in the field of flexible sensing, in particular to a stretchable alternating current electroluminescent device based on an ionic material.
Background
As an indispensable part of human life, light emitting devices are widely used in daily life, including cellular phones, computers, televisions, electronic billboards, and the like. Current light emitting display technologies include Liquid Crystal Displays (LCDs), light Emitting Diodes (LEDs), organic Light Emitting Diodes (OLEDs), quantum dot light emitting diodes (QLEDs), organic Light Emitting Transistors (OLET), alternating Current Electroluminescence (ACEL), and the like. Light emitting devices such as LCDs and OLEDs are typically based on Indium Tin Oxide (ITO) glass, the rigid nature of which makes the display difficult to bend and stretch, nor suitable for wearable displays. Currently, the existing research on flexible light-emitting transistors generally has about 30% of stretching rate, and has larger limitation in application scenes requiring large strain. In contrast, the flexible ac electroluminescent device based on ACEL has extremely high deformability and can stably operate in a state of stretching, bending, folding, twisting or even partial damage. Ac electroluminescent devices are easier and less costly to manufacture than light emitting diodes. Although the brightness is typically lower than that of a light emitting diode, it is sufficient to apply to a display under indoor conditions. Meanwhile, many emerging fields based on flexible electronics, such as wearable health monitoring systems, electronic skin, electronic textiles, and soft robots, etc., have been widely developed.
The traditional flexible alternating current electroluminescent devices mostly have good bending characteristics, but have limited tensile properties, and it is difficult to maintain uniform and stable luminous effect under the condition of large strain. In order to achieve higher stretchability of ac electroluminescent devices, it is common to modify the electrode material or to modify the structure in two ways. If the stretchability is achieved by changing the structure of the device, the complexity of device fabrication is increased, while the light emission stability of the device is reduced. However, if the electrode material is changed to achieve good stretchability, most of the high-transparency electrode materials cannot have both high stretchability and high conductivity under a large tensile strain, and the electrode conductivity is obviously reduced or even broken along with the tensile deformation of the light-emitting device, so that the light-emitting effect is obviously affected, and the device cannot have large stretchability while ensuring the light-emitting effect.
Disclosure of Invention
In order to solve the problem that the electrode material in the existing stretchable alternating current electroluminescent device cannot ensure good stretchability and conductivity at the same time, the invention provides the stretchable alternating current electroluminescent device based on the ion material, realizes the preparation of the high-transparency electrode material which can ensure good stretchability and conductivity at the same time, realizes the preparation process simplification of the stretchable alternating current electroluminescent device, is nontoxic and harmless, and has the potential of being widely applied to the fields of wearable health monitoring systems, electronic textiles and the like.
The invention solves the problems by adopting the following technical scheme:
1. stretchable alternating current electroluminescent device based on ionic material
The stretchable alternating current electroluminescent device comprises two flexible stretchable electrodes, a packaging layer and a flexible stretchable luminescent layer; the flexible stretchable luminous layer and the two flexible stretchable electrodes are completely wrapped in the packaging layer, the flexible stretchable luminous layer is arranged between the two flexible stretchable electrodes, and the flexible stretchable luminous layer and the two flexible stretchable electrodes are arranged in a stacked mode.
The two flexible stretchable electrodes are formed by paving silver nanowire layers on the ion gel layer, and the silver nanowire layers are close to one side of the packaging layer.
The silver nanowire layer is connected with an external wire through a wire interface.
The flexible stretchable luminescent layer comprises a luminescent layer flexible substrate, luminescent powder and nano ceramic particle barium titanate, wherein the luminescent powder and the nano ceramic particle barium titanate are dispersedly doped in the luminescent layer flexible substrate.
In the ionic gel layer, the mass ratio of the component materials is dimethylacetamide: thermoplastic polyurethane elastomer: EMIM TFSI ionic liquid=: 1: .
The packaging layer is prepared from a flexible material with a low elastic modulus.
The two flexible stretchable electrodes and the packaging layer are made of transparent or semitransparent materials.
2. Preparation method of stretchable alternating current electroluminescent device based on ionic material
Step one: a, B components of the luminous layer matrix material are mixed according to the mass ratio of 1:1, uniformly mixing, adding luminescent powder and nano ceramic particle barium titanate, uniformly stirring to obtain a viscous solution, placing the viscous solution into a vacuum box, and vacuumizing the viscous solution under a negative pressure environment until no bubbles overflow in the viscous solution;
step two: attaching a mask plate on a surface to be deposited, pouring bubble-free viscous solution into the mask plate on the surface to be deposited, depositing a flexible stretchable luminous layer by adopting a knife coating mode, and finally heating and curing to obtain the flexible stretchable luminous layer;
step three: adding dimethylacetamide as a solvent into a container, slowly adding a thermoplastic polyurethane elastomer and EMIM TFSI ionic liquid, stirring for 8 hours to form uniform ionic gel solution, uniformly spin-coating the ionic gel solution on the upper and lower surfaces of the flexible stretchable luminous layer subjected to plasma surface modification, and heating for curing to form an upper ionic gel layer and a lower ionic gel layer;
step four: spraying silver nanowire solution on the surfaces of the upper layer and the lower layer of ionic gel layer, heating to volatilize solvent in the silver nanowire solution, and forming uniform silver nanowire layer on the surface of the ionic gel layer;
step five: one end of a copper wire is adhered to the two cured silver nanowire layers through silver paste, and the copper wire is heated and cured to serve as an external lead of the silver nanowire layers;
step six: a, B components of the luminous layer matrix material are mixed according to the mass ratio of 1:1, uniformly mixing, uniformly coating the mixture on the outer sides of the upper silver nanowire layer and the lower silver nanowire layer, and heating and curing to form the packaging layer.
The mass ratio of the dimethylacetamide to the thermoplastic polyurethane elastomer to the EMIM TFSI ionic liquid is (6-10): 1: (1-2).
The invention has the beneficial effects that:
the invention designs an electrode with high stretchability and high conductivity by utilizing the excellent stretchability of the ion gel electrode and the high conductivity of the silver nanowire material, and applies the electrode to a stretchable alternating current electroluminescent device. The ionic conductivity of the ionic gel is lower, and the silver nanowire electrode does not have strong stretchability, so that the problem that the ionic electrode is insufficient in conductivity and weak in stretchability is solved by combining the silver nanowire material with high conductivity with the ionic gel with high stretching rate. The electrode still has higher conductivity under the state that the tensile strain reaches 250%, and the conductivity can also restore to the initial value under the state that the electrode restores to the initial length. Under the dynamic cyclic test that the tensile strain is 7.5% -30%, the electrode can keep stable conductivity, and the conductivity cannot be weakened along with the increase of cyclic stretching times. The electrode is applied to the preparation of an inorganic alternating current electroluminescent device, can ensure conductivity, and simultaneously can obtain good tensile property and high transparency. After the surface of the luminescent layer is subjected to plasma surface modification, the electrode can be uniformly deposited on the surface of the luminescent layer, and can be tightly attached to the luminescent layer under the condition of high tensile strain, so that the stability of the whole luminescence of the flexible alternating current electroluminescent device is facilitated. In addition, the electrode has simple preparation process and less required materials, and has practical application significance.
By utilizing the superior stretchability of the ion gel electrode and the high conductivity characteristics of the silver nanowire material, the invention allows the manufacture of a stretchable alternating current electroluminescent device based on ion material with a large area and ensures stretchability and luminous effect. The user can specifically adjust the size of the stretchable alternating current electroluminescent device according to actual conditions, and the stretchable alternating current electroluminescent device has a wide application range.
In addition, the novel stretchable and high-conductivity electrode designed by the invention has the characteristics of no toxicity and no harm, can be widely applied to aspects of biological sensing, detection and the like, does not cause damage to the environment, and is environment-friendly.
Drawings
FIG. 1 is a schematic diagram of the layered structure of a stretchable alternating current electroluminescent device based on an ionic material according to the present invention;
FIG. 2 is a schematic view of a flexible stretchable electrode of the present invention;
FIG. 3 is a schematic view of the internal composition of a flexible stretchable light-emitting layer of the present invention;
FIG. 4 is a graph of resistivity versus tensile strain for a flexible stretchable electrode in accordance with the present invention;
FIG. 5 is a graph of dynamic cyclic testing of flexible stretchable electrodes of the present invention at 7.5% -30% strain;
in the figure: the flexible stretchable electrode 1, the packaging layer 2, the flexible stretchable luminescent layer 3, the external lead 4, the lead interface 5, the silver nanowire layer 11, the ion gel layer 12, the luminescent powder 31, the luminescent layer flexible substrate 32 and the nano ceramic particle barium titanate 33.
Detailed Description
The invention provides a stretchable alternating current electroluminescent device based on an ion material and a preparation method thereof, and the invention is further described in detail below in order to make the technical scheme effect of the invention clearer. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The stretchable electroluminescent device adopts a sandwich structure, has good and stable luminous intensity and excellent stretching performance, and comprises two flexible stretchable electrodes 1, a packaging layer 2 and a flexible stretchable luminous layer 3 as shown in figure 1; the flexible stretchable luminous layer 3 and the two flexible stretchable electrodes 1 are completely wrapped in the packaging layer 2, the flexible stretchable luminous layer 3 is arranged between the two flexible stretchable electrodes 1, the flexible stretchable luminous layer 3 and the two flexible stretchable electrodes 1 are arranged in a stacked mode, each layer is tightly combined with the adjacent layers, and the state of mutual lamination can still be kept under the condition that the stretching amount is large. The two flexible stretchable electrodes 1 are electrically connected to an external power source.
The two flexible stretchable electrodes 1 are formed by paving silver nanowire layers 11 on an ion gel layer 12, and one side of the silver nanowire layers 11 close to the packaging layer 2 is provided with the silver nanowire layers 11 which are not contacted with the flexible stretchable luminous layer 3, namely the stretchable alternating current electroluminescent device is symmetrically arranged on two sides by taking the flexible stretchable luminous layer 3 as the center, and the ion gel layer 12, the silver nanowire layers 11 and the packaging layer 2 are sequentially arranged from the flexible stretchable luminous layer 3 to two sides. As shown in fig. 2, the silver nanowire layer 11 is connected with the external wire 4 through a wire interface 5, and the wire interface 5 is silver paste. The external lead 4 is electrically connected to an external power source.
The flexible stretchable light-emitting layer 3 includes a light-emitting layer flexible substrate 32, a light-emitting powder 31, and a nano-ceramic particle barium titanate 33, wherein the nano-ceramic particle barium titanate 33 is used for enhancing the light-emitting intensity, and the light-emitting layer flexible substrate 32 is a flexible stretchable substrate, so that the flexible stretchable light-emitting layer has a flexible stretchable function. The luminescent powder 31 and the nano ceramic particle barium titanate 33 are dispersedly doped in the luminescent layer flexible substrate 32, the nano ceramic particle barium titanate 33 is filled in gaps among the luminescent powders 31 with larger particle diameters, the compactness of the flexible stretchable luminescent layer 3 is increased, and the luminescent intensity is further improved. The dielectric constant of the nano ceramic particle barium titanate 33 is 1400.
The mass ratio of the component materials in the ionic gel layer 12 is dimethylacetamide DMAC: thermoplastic polyurethane elastomer TPU: EMIM TFSI ionic liquid= (6-10): 1: (1-2). The ionic gel layer 12 prepared by doping the ionic liquid into the flexible substrate TPU has the function of flexibility and stretchability. The ionic gel layer 12 contains freely movable ions and has ion conductivity, and the polymer properties of the base material TPU give the ionic gel layer high stretchability.
The present embodiment overcomes the problem of insufficient conductivity of the ion electrode due to ionic conduction by combining the silver nanowire layer 11 of high conductivity with the ionic gel layer 12 of high elongation. While ensuring high tensile properties, a flexible stretchable electrode 1 of high conductivity is obtained.
In addition, the embodiment can realize the adjustment of the light-emitting brightness by adjusting the ratio of the light-emitting material to the light-emitting intensity enhancing material. In a certain range, the density of the flexible stretchable luminous layer 3 is increased and the luminous intensity is enhanced along with the increase of the proportion of the luminous material to the luminous intensity enhancing material.
In this embodiment, the change in the emission color can be achieved by changing different luminescent materials. For example, the blue electroluminescent material is Cu-doped ZnS (ZnS: cu), the orange electroluminescent material is Mn-doped ZnS (ZnS: mn), the green electroluminescent material is Tb-doped ZnS (ZnS: tb), and the like.
The encapsulation layer 2 is obtained by using a flexible material with a low elastic modulus (in particular an elastic modulus <150 kPa), and has excellent stretchability.
The two flexible stretchable electrodes 1 and the packaging layer 2 are both made of transparent or semitransparent materials.
In one embodiment, a method for preparing a stretchable alternating current electroluminescent device based on an ionic material comprises the steps of:
step one: a, B components of the luminous layer matrix material Ecoflex 00-31 are mixed according to the mass ratio of 1:1, uniformly mixing, adding luminescent powder 31 and nano ceramic particle barium titanate 33 for enhancing the luminous intensity, uniformly stirring to obtain a viscous solution, placing the viscous solution into a vacuum box, and vacuumizing the viscous solution for three minutes under negative pressure of-0.1 MPa until no bubbles overflow in the viscous solution;
step two: attaching a mask plate with a specific shape and thickness on a surface to be deposited, pouring bubble-free viscous solution into the mask plate on the surface to be deposited, depositing a flexible stretchable luminous layer 3 with controllable thickness and shape by adopting a knife coating mode, and finally heating and curing at 80 ℃ for 1 hour to obtain the flexible stretchable luminous layer 3;
step three: adding dimethylacetamide as a solvent into a container (such as a beaker), and slowly adding a thermoplastic polyurethane elastomer and EMIM TFSI ionic liquid, wherein the mass ratio of the thermoplastic polyurethane elastomer to the EMIM TFSI ionic liquid is 8:1:2; after stirring for 8 hours on a magnetic stirrer, forming uniform ionic gel solution, uniformly spin-coating the ionic gel solution on the upper and lower surfaces of the flexible stretchable luminous layer 3 subjected to plasma surface modification, heating at 80 ℃ for 8 hours, and then curing to form an upper ionic gel layer 12 and a lower ionic gel layer 12;
step four: spraying silver nanowire solution on the surfaces of the upper ionic gel layer 12 and the lower ionic gel layer 12, heating at 80 ℃ for 30 minutes, and volatilizing a solvent in the silver nanowire solution, so that a uniform silver nanowire layer 11 is formed on the surfaces of the ionic gel layers 12;
step five: one end of a copper wire is adhered to the two cured silver nanowire layers 11 through silver paste, and is heated and cured for 30 minutes at 80 ℃ to serve as an external lead of the silver nanowire layers 11;
step six: a, B components of the luminous layer matrix material Ecoflex 00-31 are mixed according to the mass ratio of 1:1 are evenly mixed and evenly smeared on the outer sides of the upper silver nanowire layer 11 and the lower silver nanowire layer 11, and then the packaging layer 2 is formed after heating and solidifying.
Further, the viscous solution containing luminescent material and luminescent intensity enhancing material mixed in the first step is prepared by mixing luminescent powder 31 and nano ceramic particle barium titanate 33 in a weight ratio of (1.0:1.0) - (1.5:0.5) g into 2g polymer substrate. Polymeric substrates include, but are not limited to, aliphatic aromatic random copolyesters (Ecoflex), polydimethylsiloxane (PDMS).
The invention is further described below:
as shown in fig. 3, an embodiment of the present invention provides a stretchable ac electroluminescent device based on an ionic material, which includes a flexible stretchable light-emitting layer 3, wherein the flexible stretchable light-emitting layer 3 uses Ecoflex 00-31 as a flexible substrate, and includes a light-emitting powder 31 and a nano ceramic particle barium titanate 33 for enhancing light-emitting intensity, and the light-emitting powder 31 emits blue fluorescence under the driving of ac voltage. Since the particle diameter of the luminescent powder 31 is about 200 times that of the nano ceramic particle barium titanate 33, doping the nano ceramic particle barium titanate 33 in the luminescent powder 31 can remarkably improve the density of the luminescent layer, and increase the electric field intensity in the luminescent layer, thereby improving the luminous intensity.
The flexible stretchable light-emitting device prepared by the preparation method has the advantages of strong stretchability, stable light-emitting performance, uniform light-emitting effect, high stability and high tolerance.
To verify the performance of the flexible stretchable electrode prepared in the present invention, the following tests were performed:
1. resistance-strain calibration test
In the invention, two external leads are prepared in a fifth mode at two ends of a silver nanowire layer of the flexible stretchable electrode 1. And (3) carrying out uniaxial tensile test on the sample by using a tensile testing machine, and simultaneously recording resistance values under different strains in real time by using a digital universal meter. As shown in fig. 4, the resistance change exhibits a higher linearity over the 250% strain range, i.e., as the tensile strain of the sample increases, the resistance value of the sample increases approximately linearly therewith. At a tensile strain of 250%, the resistance value increases by a factor of about 5.
2. Dynamic cyclic tensile property test
In the invention, two external leads are prepared in a fifth mode at two ends of a silver nanowire layer of the flexible stretchable electrode 1. And (3) carrying out dynamic cyclic tensile property test on the sample within the strain range of 7.5% -30% by using a tensile testing machine, and simultaneously recording the resistance value under cyclic strain in real time by using a digital universal meter. As shown in fig. 5, the resistance value in 20-cycle stretching always changes in an approximately linear trend, and the resistance value remains stable in a periodic variation.
Finally, it should be noted that the above-mentioned embodiments and descriptions are only illustrative of the technical solution of the present invention and are not limiting. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (9)

1. The stretchable alternating current electroluminescent device based on the ionic material is characterized by comprising two flexible stretchable electrodes (1), an encapsulation layer (2) and a flexible stretchable luminescent layer (3); the flexible stretchable luminous layer (3) and the two flexible stretchable electrodes (1) are completely wrapped in the packaging layer (2), the flexible stretchable luminous layer (3) is arranged between the two flexible stretchable electrodes (1), and the flexible stretchable luminous layer (3) and the two flexible stretchable electrodes (1) are arranged in a laminated mode.
2. The stretchable alternating current electroluminescent device based on ionic materials according to claim 1, characterized in that the two flexible stretchable electrodes (1) are each composed of a silver nanowire layer (11) laid on an ionic gel layer (12), the silver nanowire layer (11) being close to one side of the encapsulation layer (2).
3. A stretchable alternating current electroluminescent device based on ionic materials according to claim 1, characterized in that the silver nanowire layer (11) is connected to an external wire (4) via a wire interface (5).
4. A stretchable alternating current electroluminescent device based on ionic materials according to claim 1, characterized in that the flexible stretchable luminescent layer (3) comprises a luminescent layer flexible substrate (32), luminescent powder (31) and nano-ceramic particle barium titanate (33), the luminescent powder (31) and the nano-ceramic particle barium titanate (33) being doped in the luminescent layer flexible substrate (32) in a dispersed manner.
5. A stretchable ac electroluminescent device based on ionic materials according to claim 2, characterized in that in the ionic gel layer (12), the mass ratio of the component materials is dimethylacetamide: thermoplastic polyurethane elastomer: EMIM TFSI ionic liquid= (6-10): 1: (1-2).
6. Stretchable alternating current electroluminescent device based on ionic materials according to claim 1, characterized in that the encapsulation layer (2) is obtained with a flexible material having a low elastic modulus.
7. The stretchable alternating current electroluminescent device based on the ionic material according to claim 1, wherein the two flexible stretchable electrodes (1) and the encapsulation layer (2) are made of transparent or semitransparent materials.
8. The method for manufacturing a stretchable alternating current electroluminescent device based on ionic materials according to claim 1, wherein the method comprises the steps of:
step one: a, B components of the luminous layer matrix material are mixed according to the mass ratio of 1:1, uniformly mixing, adding luminescent powder (31) and nano ceramic particle barium titanate (33), uniformly stirring to obtain a viscous solution, placing the viscous solution into a vacuum box, and vacuumizing the viscous solution under a negative pressure environment until no bubbles overflow in the viscous solution;
step two: attaching a mask plate on a surface to be deposited, pouring bubble-free viscous solution into the mask plate on the surface to be deposited, depositing a flexible stretchable luminous layer (3) in a knife coating mode, and finally heating and curing to obtain the flexible stretchable luminous layer (3);
step three: adding dimethylacetamide as a solvent into a container, adding a thermoplastic polyurethane elastomer and EMIM TFSI ionic liquid, stirring for 8 hours to form uniform ionic gel solution, uniformly spin-coating the ionic gel solution on the upper and lower surfaces of the flexible stretchable luminous layer (3) subjected to plasma surface modification, and heating and curing to form an upper ionic gel layer (12) and a lower ionic gel layer;
step four: spraying silver nanowire solution on the surfaces of the upper and lower ion gel layers (12), heating to volatilize solvent in the silver nanowire solution, and forming a uniform silver nanowire layer (11) on the surfaces of the ion gel layers (12);
step five: one end of a copper wire is adhered to the two solidified silver nanowire layers (11) through silver paste, and the copper wire is used as an external lead of the silver nanowire layers (11) after being heated and solidified;
step six: a, B components of the luminous layer matrix material are mixed according to the mass ratio of 1:1 are evenly mixed and evenly smeared on the outer sides of the upper silver nanowire layer (11) and the lower silver nanowire layer, and then the packaging layer (2) is formed after heating and solidifying.
9. The preparation method of the stretchable alternating current electroluminescent device based on the ionic material according to claim 8, wherein the mass ratio of the dimethylacetamide to the thermoplastic polyurethane elastomer to the EMIM TFSI ionic liquid is (6-10): 1: (1-2).
CN202311098046.7A 2023-08-29 2023-08-29 Stretchable alternating current electroluminescent device based on ionic material Pending CN117279410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311098046.7A CN117279410A (en) 2023-08-29 2023-08-29 Stretchable alternating current electroluminescent device based on ionic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311098046.7A CN117279410A (en) 2023-08-29 2023-08-29 Stretchable alternating current electroluminescent device based on ionic material

Publications (1)

Publication Number Publication Date
CN117279410A true CN117279410A (en) 2023-12-22

Family

ID=89201702

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311098046.7A Pending CN117279410A (en) 2023-08-29 2023-08-29 Stretchable alternating current electroluminescent device based on ionic material

Country Status (1)

Country Link
CN (1) CN117279410A (en)

Similar Documents

Publication Publication Date Title
Zhou et al. Stretchable high-permittivity nanocomposites for epidermal alternating-current electroluminescent displays
Zhao et al. Fully screen-printed, multicolor, and stretchable electroluminescent displays for epidermal electronics
Yang et al. Electroluminescence of giant stretchability
Zhou et al. Bright stretchable electroluminescent devices based on silver nanowire electrodes and high-k thermoplastic elastomers
Liang et al. Elastomeric polymer light-emitting devices and displays
White et al. Ultrathin, highly flexible and stretchable PLEDs
CN107610802B (en) Transparent conductive film, photoelectric device and preparation method thereof
Yang et al. Asymmetrically Enhanced Coplanar‐Electrode Electroluminescence for Information Encryption and Ultrahighly Stretchable Displays
Wang et al. Progress and prospects in stretchable electroluminescent devices
Yang et al. Alternating current electroluminescent devices with inorganic phosphors for deformable displays
CN1794464A (en) Vertical interconnect for organic electronic devices
Zhang et al. Recent advances in flexible alternating current electroluminescent devices
CN104464517A (en) Display apparatus and method of fabricating the same
Sun et al. Flexible environment-tolerant electroluminescent devices based on nanocellulose-mediated transparent electrodes
US10944072B2 (en) Stretchable electroluminescent devices
CN107004695A (en) Organic light emitting apparatus
CN112414595A (en) Self-powered visual flexible pressure sensor based on friction electroluminescence
CN111205406A (en) Dielectric elastomer precursor solution, preparation method and application thereof, dielectric elastomer composite material, flexible device and light-emitting device
CN112087836B (en) Flexible electroluminescent device capable of dynamically changing color and preparation method thereof
CN117279410A (en) Stretchable alternating current electroluminescent device based on ionic material
CN107887524A (en) Electrode and the Organic Light Emitting Diode, liquid crystal display device and organic light-emitting display device for including it
CN111785706B (en) Flexible LED plane light-emitting device
JPWO2009047899A1 (en) LIGHT EMITTING ELEMENT AND DISPLAY DEVICE
US20220325089A1 (en) A dielectric material
Liu et al. Study on Printable Inorganic Alternating Current Electroluminescence Devices based on Different Electrode Structures.

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination