CN114784202A - Wearable flexible low-temperature-resistant self-driven electroluminescence system and construction method thereof - Google Patents
Wearable flexible low-temperature-resistant self-driven electroluminescence system and construction method thereof Download PDFInfo
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- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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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
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- 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
- H10K71/15—Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used
Abstract
The invention discloses a wearable flexible low-temperature-resistant self-driven electroluminescent system and a construction method thereof. The wearable flexible low-temperature-resistant self-driven electroluminescent system is formed by integrating the electroluminescent device and a friction nano generator constructed by taking a silica gel packaged glycerol/KI solution as a liquid electrolyte. The self-driven electroluminescent system constructed has stretchability (200%) and long-term freezing resistance. After being stored for six months at the low temperature of minus 20 ℃, the system can still emit bright blue-green light, can be worn on different parts of a human body, and collects biological mechanical energy and converts the biological mechanical energy into electric energy to drive and lighten an electroluminescent device by a worn friction nano generator.
Description
Technical Field
The invention belongs to the technical field of wearable flexible photoelectricity, and particularly relates to a wearable flexible low-temperature-resistant self-driven electroluminescence system and a construction method thereof.
Background
In recent years, ac-driven electroluminescent devices have attracted the interest of a wide range of researchers because they can be easily integrated into 110/220V, 50/60 Hz ac power systems without complex backend electronics processing, and can be used as a potential replacement for dc-driven organic light emitting diodes. However, most of the electroluminescent devices reported at present use an external ac power supply to supply power to the electroluminescent devices, the overall equipment is complex, and it is difficult to achieve the wearability of the whole device, which limits the further application of the electroluminescent devices in actual life. The friction nano generator is used as a power supply device of the electroluminescent device, energy generated in daily life of people is collected to supply power to the electroluminescent device, and consumption of traditional energy is reduced.
As an important display device, the electroluminescent device has very wide application in the fields of electronic equipment, flexible displays, wearable equipment, household appliances and the like. The conventional electroluminescent device generally uses a thin film formed by mixing carbon nanotubes, silver nanowires, graphene and the like with a flexible elastomer as a conductive electrode. However, the cost of using such conductive electrodes is high, and at large strains, the resistance increases dramatically, resulting in failure of the light emitting device. On the other hand, in order to meet the application in real life, the electroluminescent device needs to work normally under severe conditions, so that research and development of a wearable flexible low-temperature-resistant self-driven electroluminescent system have important practical application significance.
Disclosure of Invention
The invention provides a wearable flexible low-temperature-resistant self-driven electroluminescent system and a construction method thereof, and the construction method of an electroluminescent device mainly solves the problem that the electroluminescent device prepared in the prior art is difficult to work normally under the low-temperature condition.
In order to solve the problems, the invention adopts the technical scheme that:
a construction method of a wearable flexible low-temperature-resistant self-driven electroluminescent system comprises the following steps:
(1) preparing a flexible low-temperature-resistant electroluminescent device:
a. dissolving gelatin and NaCl in deionized water, heating the obtained mixture to 55-65 ℃, stirring until the mixture is completely dissolved, pouring the mixed solution into a template, and placing the template in a refrigerator for freezing to form the template; wherein the mass ratio of the gelatin to the NaCl is 1:1.17, and each 1g of the gelatin needs 9mL of water;
b. mixing glycerol and water in a mass ratio of 1:1, adding sodium citrate, and uniformly stirring, wherein the sodium citrate accounts for 18-22% of the total mass of the glycerol and the water;
c. taking out the hydrogel film frozen and formed in the step a, and soaking the hydrogel film into the solution obtained in the step b for 2.5-3.5 hours;
d. dissolving polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles in acetone, adding ZnS: Cu powder into the acetone, stirring the obtained mixture for at least 6 hours, pouring the mixed solution into a template, drying at room temperature, and stripping from the template to obtain a composite light-emitting layer; the mass ratio of the PVDF-HFP particles to the ZnS-Cu powder is 1: 1-1.6; 3mL of acetone is required for every 0.5g of PVDF-HFP particles; preferably, the dosage of ZnS: Cu powder is 0.6 g, the mass of PVDF-HFP particles is 0.5g, and the particle size of ZnS: Cu powder is 14.5 +/-0.2 mu m.
e. Taking the electrode obtained in the step c and the light emitting layer obtained in the step d to form an electrode/light emitting layer/electrode three-layer sandwich structure, wherein the three-layer sandwich structure is a flexible low-temperature-resistant electroluminescent device;
(2) preparing a wearable low-temperature-resistant friction nano generator:
s1, pouring the uniformly mixed liquid silica gel and the matched curing agent into a mould, and placing the mould at room temperature for curing to form the silica gel with a concave middle part;
s2, peeling the silica gel prepared in the step S1 from the mold, placing a copper wire on the side with the recess, wherein the copper wire extends out of the silica gel, and then sealing the two silica gel sheets with the recess together by using liquid silica gel to form a cavity in the middle;
s3, injecting liquid electrolyte formed by dissolving KI in glycerol (Gly) into the cavity, and thus constructing the wearable low-temperature-resistant friction nano generator;
(3) construction of self-driven electroluminescent systems
Connecting a copper wire of the friction nano generator with one electrode layer of the flexible low-temperature-resistant electroluminescent device, and grounding the other electrode layer to realize the integration of the friction nano generator and the electroluminescent device, thereby constructing a self-driven electroluminescent system.
Further, in step S1, the curing agent accounts for 3% of the liquid silicone gel by volume.
Further, the preparation process of the KI-Gly liquid electrolyte comprises the following steps: KI was dissolved in glycerol (Gly) with a concentration of 20wt% in glycerol (Gly).
According to the wearable flexible low-temperature-resistant self-driven electroluminescent system constructed by the method, the size of an electrode in an electroluminescent device is 30mm multiplied by 30mm, the thickness of the electrode is 0.8mm, the size of a light emitting layer is 30mm multiplied by 30mm, and the thickness of the light emitting layer is 110 mu m; the size of the silica gel sheet in the friction nanometer generator is 50mm multiplied by 300mm, the thickness is 4mm, the size of the depression is 30mm multiplied by 260mm, and the depth is 1.8 mm.
The wearable low-temperature-resistant friction nano-generator is successfully prepared by the method.
According to the use method of the flexible low-temperature-resistant electroluminescent device, the friction nano generator is connected with one electrode of the electroluminescent device, the other electrode of the electroluminescent device is grounded, the friction nano generator converts mechanical energy of human body movement into electric energy and then supplies power to the electroluminescent device, and then the electroluminescent device displays bright blue and green light.
The invention provides a wearable flexible low-temperature-resistant self-driven electroluminescent system. The electroluminescent device uses a friction nano generator to supply power to the electroluminescent device, and replaces a traditional alternating current power supply; in addition, the flexible low-temperature-resistant electroluminescent device takes hydrogel with self-healing and high conductivity as an electrode, and takes a mixed film of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) elastomer and ZnS: Cu fluorescent powder as a light-emitting layer, so that the whole device has excellent flexibility and stretchability; due to the low temperature resistance of the hydrogel, the hydrogel can have high conductivity at low temperature, and the used friction nano generator is formed by taking low temperature resistant KI/glycerol liquid electrolyte as an electrode and still has high output at the temperature of-20 ℃, so that the prepared electroluminescent device driven by the wearable low temperature resistance friction nano generator has good long-term freezing resistance. The wearable flexible low-temperature-resistant self-driven electroluminescent system is expected to have important practical values in the aspects of display, wearable electronic equipment, human-computer interaction, medical detection, intelligent robots and the like.
Drawings
FIG. 1 is a schematic diagram of a wearable flexible low temperature resistant self-driven electroluminescent system of the present invention;
FIG. 2 is an SEM image of a light-emitting layer in example 1;
FIG. 3 is a stress-strain curve of a hydrogel electrode;
FIG. 4 is a light transmittance of a hydrogel electrode;
FIG. 5 is a flow chart of the preparation of the wearable low temperature friction resistant nano-generator;
FIG. 6 is a light emission spectrum of an electroluminescent device in example 1;
fig. 7 shows the light emission spectrum of the flexible low temperature resistant electroluminescent device corresponding to the relative content of the phosphor ZnS to Cu, which is obtained by fixing the content of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles in the light emitting layer in example 2;
FIG. 8 is the light emission spectrum of the electroluminescent device driven by the tribo-nanogenerator of example 1 with different voltages and different frequencies;
FIG. 9 is an optical image of the flexible low temperature resistant electroluminescent device of example 1 emitting light under different tensions;
FIG. 10 is the change of the conductivity of the hydrogel electrode of the flexible low temperature resistant electroluminescent device in example 1 at different temperatures;
FIG. 11 is the electrical output of the wearable low temperature friction resistant nano-generator at low temperature of-20 ℃;
fig. 12 is an optical image of the electroluminescent device of example 1 lit to emit light at low temperatures;
FIG. 13 is a long-term (6-month) stability test of luminescence of the electroluminescent device of example 1 under a low temperature condition of-20 ℃;
fig. 14 is an optical image of the luminescence of the patterned electroluminescent device of example 3;
fig. 15 is an optical image of the self-driven electroluminescent system of example 4 worn on different parts of the human body to emit light.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example 1
A construction method of a wearable flexible low-temperature-resistant self-driven electroluminescence system comprises the following steps:
step one, 1g of gelatin and 1.17 g of NaCl particles were dissolved in 9mL of deionized water, and the resulting mixture was heated to 60 ℃ and stirred until completely dissolved. Pouring the mixed solution into a template, and placing the template in a refrigerator at the temperature of-4 ℃ for freezing for half an hour to form.
Step two, mixing glycerol and water in a mass ratio of 1:1, adding sodium citrate, and uniformly stirring, wherein the sodium citrate accounts for 20% of the total mass of the glycerol and the water.
And step three, taking out the hydrogel film frozen and formed in the step one, and soaking the hydrogel film in the solution obtained in the step two for 3 hours to obtain an electrode with the size of 30mm multiplied by 30mm and the thickness of 0.8 mm.
Fig. 3 and 4 show the light transmittance and stretchability of the hydrogel, respectively, and the stress strain of the prepared hydrogel electrode is 280%, and the light transmittance can reach 92%, which meets the requirements of stretchable electroluminescent device electrodes.
And step four, dissolving 0.5G of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) (purchase factory: Solavet; model: G757) particles in 3ml of acetone, adding 0.6G of ZnS: Cu powder (purchase factory: Shanghai Kelvin electro-optical technology Co., Ltd.; particle size: 14.5 + -0.2 μm) to the acetone, stirring the resulting mixture on a magnetic stirrer at a speed of 1000 r/min for at least 6 hours, pouring the mixed solution into a mold, and drying the mixture at room temperature for 6 hours to form a film, wherein an SEM image of the luminescent layer is shown in FIG. 2, wherein FIG. 2 shows that ZnS: Cu fluorescent powder is completely embedded in a PVDF-HFP elastomer film, and a luminescent layer having a size of 30mm x 30mm and a thickness of 110 μm is obtained by peeling the ZnS from the mold.
And step five, constructing an electrode/light-emitting layer/electrode three-layer sandwich structure by the hydrogel electrode obtained in the step three and the light-emitting layer obtained in the step four. As shown in figure 1, the electroluminescent device prepared by the invention comprises three parts, namely two transparent hydrogel electrodes and a light-emitting layer, wherein the transparent hydrogel electrodes are formed by doping NaCl into degradable gelatin hydrogel, and the light-emitting layer mainly comprises ZnS: Cu fluorescent powder embedded into a polymer elastomer polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) film. FIG. 6 shows the luminescence spectrum of an electroluminescent device, and the luminescence peak wavelength of flexible low temperature resistant electroluminescence is 503 nm.
And sixthly, pouring the uniformly mixed liquid silica gel (purchased from Taida chemical raw materials Co., Ltd., the type of the liquid silica gel is 883) and the curing agent (the curing agent accounts for 3% of the volume of the liquid silica gel, purchased from Taida chemical raw materials Co., Ltd., the type of the curing agent is 009) into a mold with the size of 50mm multiplied by 300mm and the thickness of 4mm, wherein a recess is formed in the middle of the mold, and the mold is placed at room temperature for curing for 5 hours, so that a silica gel sheet with the size of 50mm multiplied by 300mm and the thickness of 4mm is formed, wherein the recess in the silica gel sheet is 30mm multiplied by 260mm, and the depth is 1.8 mm.
And step seven, peeling the silica gel prepared in the step six from the mold, placing a copper wire with the diameter of 0.2mm on one side with the recess, extending the copper wire out of the silica gel, and then sealing two pieces of the same silica gel together by using liquid silica gel to form a cavity with the size of 30mm multiplied by 260 mm.
Step eight, injecting 30ml of KI-Gly liquid electrolyte (KI is dissolved in glycerol (Gly) and the concentration of KI in the glycerol (Gly) is 20 wt%) into the cavity, thereby constructing the wearable low-temperature-friction-resistant nano generator. The structure of the obtained wearable low-temperature friction-resistant nano generator is shown in fig. 5.
Step nine, connecting a copper wire of the friction nano generator with one electrode layer of the flexible low-temperature-resistant electroluminescent device, and grounding the other electrode layer, wherein when the friction nano generator works, the friction is performed on the hand of an operator (equivalent to grounding), as shown in fig. 1, the integration of the friction nano generator and the electroluminescent device is realized, and thus a self-driven electroluminescent system is constructed.
FIG. 8 shows the corresponding variation of luminescence intensity of the flexible low temperature resistant electroluminescent device (PVDF-HFP particles in an amount of 0.5g, ZnS: Cu phosphor powder in an amount of 0.6 g) at different voltages and different frequencies supplied from the tribo nanogenerator. As can be seen from fig. 8, the light emitting intensity of the flexible low temperature resistant electroluminescent device gradually increases with the increase of the voltage and the frequency, and the spectrometer can detect the light emitting signal of the electroluminescent device at the lower frequency of 3.3 Hz when the voltage is 150V.
Fig. 9 shows the luminescence optical images of flexible low temperature resistant electroluminescent devices under different degrees of stretching. As can be seen from fig. 9, when the flexible low temperature resistant electroluminescent device is stretched to 140%, it can still work normally without significant change in brightness. This indicates that the flexible low temperature resistant electroluminescent device has excellent stretchability.
Fig. 10 shows the change in conductivity at different temperatures for the electrodes of a flexible, low temperature-resistant electroluminescent device. As can be seen from fig. 10, as the temperature decreases, the movement rate of the ions decreases, and the conductivity of the electrode of the electroluminescent device decreases, but the electrode still has a certain conductivity, so that the required conditions for the electrode of the electroluminescent device can be satisfied.
Fig. 11 shows that the wearable triboelectric nanogenerator still has a high electrical output at-20 ℃, and can provide the electric energy required by the electroluminescent device under the condition of low temperature.
Fig. 12 shows an optical image of a flexible low temperature resistant electroluminescent device lit to emit light at low temperatures. As can be seen from fig. 12, as the temperature decreases, the light emission of the flexible low temperature-resistant electroluminescent device is not affected, and when the temperature decreases to-20 ℃, the flexible low temperature-resistant electroluminescent device can still work normally.
Fig. 13 shows the optical stability of the luminescence of the flexible electroluminescent device at-20 ℃, and it can be seen from fig. 13 that the electroluminescent device can still emit bright blue-green light and show long-term stable luminescence performance when stored for 6 months in an environment of-20 ℃.
Example 2
Five parts of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles (purchased factory: Solavet; model: G757) with the mass of 0.5G are respectively dissolved into 3ml of acetone, then ZnS: Cu fluorescent powder (purchased factory: Shanghai Ke Runtion electro-optical technology Limited; particle size: 14.5 +/-0.2 mu m) with the mass of 0.5G, 0.6G, 0.7G and 0.8G are respectively added into the acetone, the obtained mixture is placed on a magnetic stirrer to be stirred for at least 6 hours under the condition of 1000 r/min, then the solution is poured into a mold and dried for 6 hours under the condition of room temperature to form a film, and a luminescent layer with the size of 30mm x 30mm and the thickness of 110 mu m is obtained. Finally, the formed light-emitting layer and the hydrogel electrode prepared in example 1 were combined in the order of electrode/light-emitting layer/electrode to form a flexible low-temperature-resistant electroluminescent device having a three-layer sandwich structure, and the light emission spectrum of the corresponding flexible low-temperature-resistant electroluminescent device was measured, with the result shown in fig. 7.
FIG. 7 shows the effect of the content of ZnS: Cu phosphor in wearable flexible low temperature resistant self-driven electroluminescent system (PVDF-HFP 0.5 g) on the luminous intensity. As can be seen from FIG. 7, with the increase of the amount of ZnS: Cu fluorescent powder, the luminous intensity of the flexible low temperature resistant electroluminescent device is increased and then reduced. When the content of the ZnS: Cu fluorescent powder is 0.6 g, the luminous intensity of the flexible low-temperature-resistant electroluminescent device reaches the highest, and the luminous intensity of the flexible low-temperature-resistant electroluminescent device is weakened with the further increase of the consumption of the ZnS: Cu fluorescent powder. With the increase of the content of ZnS-Cu fluorescent powder, an electric field generated by an additional friction nano generator can excite more photons to emit, so that the luminous intensity is increased; when the content of ZnS: Cu phosphor is further increased, the aggregation of excessive luminescent particles may hinder luminescence.
Example 3
Step one, 1g of gelatin and 1.17 g of NaCl particles were dissolved in 9mL of deionized water, and the resulting mixture was heated to 60 ℃ and stirred until completely dissolved. Pouring the mixed solution into a panda pattern template, and placing the panda pattern template in a refrigerator at the temperature of-4 ℃ for freezing for half an hour to form.
Step two, mixing glycerol and water in a mass ratio of 1:1, adding sodium citrate, and uniformly stirring, wherein the sodium citrate accounts for 20% of the total mass of the glycerol and the water.
And step three, taking out the hydrogel film frozen and formed in the step one, and soaking the hydrogel film into the solution obtained in the step two for 3 hours to obtain the panda pattern electrode, wherein the size of the panda pattern electrode is 30mm multiplied by 55mm, and the thickness of the panda pattern electrode is 0.8 mm.
And step four, obtaining the light-emitting layer with the size of 30mm multiplied by 30mm and the thickness of 110 mu m by using the preparation method of the light-emitting layer in the embodiment 1.
Step five, constructing an electrode/light-emitting layer/electrode three-layer sandwich structure by using the hydrogel electrode obtained in the step three and the light-emitting layer obtained in the step four, and testing an optical image of light emission of the corresponding patterned electroluminescent device, wherein the result is shown in fig. 14.
Example 4
The self-driven electroluminescent system constructed in example 1 was worn on different parts of the human body, and as a result, as shown in fig. 15, the self-driven electroluminescent system collected mechanical energy from human body movements, such as hand clapping, elbow bending and knee bending, and the corresponding electroluminescent device showed real-time light emission, which represents the practical application of the self-driven electroluminescent system in wearable display.
The invention provides a wearable flexible low-temperature-resistant self-driven electroluminescent system. The display device is different from the traditional electroluminescent device, and the friction nano generator is used for supplying power to the display device, so that the energy consumption is reduced; in addition, the hydrogel is used as an electrode, the prepared hydrogel not only has high conductivity which is 1.6S/m, but also has high transparency and stretchability, the hydrogel still has certain conductivity at the temperature of-20 ℃, and the selected friction nano generator still has excellent electrical output at the temperature of-20 ℃, so that the prepared wearable flexible low-temperature-resistant self-driven electroluminescent system has no obvious change in the light emitting condition at the temperature of-20 ℃. The wearable flexible low-temperature-resistant self-driven electroluminescent system is expected to have important practical values in the aspects of display, wearable electronic equipment, human-computer interaction, medical detection, intelligent robots and the like.
Claims (7)
1. A construction method of a wearable flexible low-temperature-resistant self-driven electroluminescent system is characterized by comprising the following steps:
(1) preparing a flexible low-temperature-resistant electroluminescent device:
a. dissolving gelatin and NaCl in deionized water, heating the obtained mixture to 55-65 ℃, stirring until the mixture is completely dissolved, pouring the mixed solution into a template, and placing the template in a refrigerator for freezing to form the template;
b. mixing glycerol and water in a mass ratio of 1:1, adding sodium citrate, and uniformly stirring, wherein the sodium citrate accounts for 18-22% of the total mass of the glycerol and the water;
c. taking out the hydrogel film frozen and formed in the step a, and soaking the hydrogel film into the solution in the step b for 2.5-3.5 hours;
d. dissolving PVDF-HFP particles in acetone, adding ZnS-Cu powder into the acetone, stirring the obtained mixture for at least 6 hours, pouring the mixed solution into a template, drying at room temperature, and stripping the template to obtain a composite light-emitting layer; the mass ratio of the PVDF-HFP particles to the ZnS-Cu powder is 1: 1-1.6; 3mL of acetone is required for every 0.5g of PVDF-HFP particles;
e. taking the electrode obtained in the step c and the light-emitting layer in the step d to form an electrode/light-emitting layer/electrode three-layer sandwich structure, wherein the three-layer sandwich structure is an electroluminescent device;
(2) preparing a wearable low-temperature-resistant friction nano generator:
s1, pouring the uniformly mixed liquid silica gel and the matched curing agent into a mould, and placing the mould at room temperature for curing to form the silica gel with a concave middle part;
s2, peeling the silica gel prepared in the step S1 from the mold, placing a copper wire on the side with the recess, wherein the copper wire extends out of the silica gel, and then sealing the two silica gel sheets with the recess together by using liquid silica gel to form a cavity in the middle;
s3, injecting liquid electrolyte formed by dissolving KI in glycerol into the cavity, so as to construct the wearable friction nano-generator;
construction of self-driven electroluminescent systems
The copper wire of the friction nano generator is connected with one electrode layer of the electroluminescent device, and the other electrode layer is grounded, so that the integration of the friction nano generator and the electroluminescent device is realized, and the self-driven electroluminescent system is constructed.
2. The method for constructing the wearable flexible low-temperature-resistant self-driven electroluminescent system according to claim 1, wherein in the step a, the mass ratio of gelatin to NaCl is 1:1.17, and 9mL of water is required for every 1g of gelatin.
3. The construction method of the wearable flexible low-temperature-resistant self-driven electroluminescent system according to claim 1, wherein the dosage of ZnS: Cu powder is 0.6 g, the mass of PVDF-HFP particles is 0.5g, and the particle size of ZnS: Cu powder is 14.5 +/-0.2 μm.
4. The method for constructing the wearable flexible low temperature resistant self-driven electroluminescent system according to claim 1, wherein in step S1, the curing agent is 3% by volume of the liquid silicone gel.
5. The method for constructing the wearable flexible low-temperature-resistant self-driven electroluminescent system according to claim 1, wherein the KI-Gly liquid electrolyte is prepared by the following steps: KI was dissolved in glycerol, and the concentration of KI in glycerol was 20 wt%.
6. The wearable flexible low temperature-resistant self-driven electroluminescent system constructed by the method of any one of claims 1 to 5, wherein the size of an electrode in an electroluminescent device is 30mm x 30mm, the thickness of the electrode is 0.8mm, the size of a light-emitting layer is 30mm x 30mm, and the thickness of the light-emitting layer is 110 μm; the size of the silica gel sheet in the friction nanometer generator is 50mm multiplied by 300mm, the thickness is 4mm, the size of the depression is 30mm multiplied by 260mm, and the depth is 1.8 mm.
7. Use of the self-driven electroluminescent system of claim 6 in a wearable device.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180090709A1 (en) * | 2015-06-19 | 2018-03-29 | Peking University Shenzhen Graduate School | Planar electroluminescent devices and uses thereof |
| CN112087836A (en) * | 2020-08-06 | 2020-12-15 | 复旦大学 | Flexible electroluminescent device capable of changing color dynamically and preparation method thereof |
| CN113629201A (en) * | 2021-07-02 | 2021-11-09 | 河南大学 | Construction method of triboelectrification induced electroluminescent device capable of identifying fingerprints and having brightness superior to commercial LED |
| CN113724919A (en) * | 2021-08-24 | 2021-11-30 | 上海科润光电技术有限公司 | Self-luminous flexible wearable device for real-time monitoring |
| CN113923814A (en) * | 2021-09-17 | 2022-01-11 | 河南大学 | Self-driven electroluminescent system based on patterned metal film electrode and construction method thereof |
-
2022
- 2022-02-28 CN CN202210184507.1A patent/CN114784202B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180090709A1 (en) * | 2015-06-19 | 2018-03-29 | Peking University Shenzhen Graduate School | Planar electroluminescent devices and uses thereof |
| CN112087836A (en) * | 2020-08-06 | 2020-12-15 | 复旦大学 | Flexible electroluminescent device capable of changing color dynamically and preparation method thereof |
| CN113629201A (en) * | 2021-07-02 | 2021-11-09 | 河南大学 | Construction method of triboelectrification induced electroluminescent device capable of identifying fingerprints and having brightness superior to commercial LED |
| CN113724919A (en) * | 2021-08-24 | 2021-11-30 | 上海科润光电技术有限公司 | Self-luminous flexible wearable device for real-time monitoring |
| CN113923814A (en) * | 2021-09-17 | 2022-01-11 | 河南大学 | Self-driven electroluminescent system based on patterned metal film electrode and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 史强;张俊英;王长征;王利;: "ZnGa_2O_4∶Mn~(2+)粉末的电致发光性能", 材料科学与工程学报, no. 06, 20 December 2010 (2010-12-20) * |
| 陈佳;李长胜;郭素文;郑岩;: "ZnS:Cu电致发光薄膜的交流电压传感特性", 激光杂志, no. 11, 25 November 2016 (2016-11-25) * |
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