CN114784202B - Wearable flexible low-temperature-resistant self-driven electroluminescent system and construction method thereof - Google Patents
Wearable flexible low-temperature-resistant self-driven electroluminescent system and construction method thereof Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 52
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000741 silica gel Substances 0.000 claims abstract description 27
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 27
- 239000000017 hydrogel Substances 0.000 claims abstract description 24
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000011244 liquid electrolyte Substances 0.000 claims abstract description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 108010010803 Gelatin Proteins 0.000 claims description 9
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- 229920000159 gelatin Polymers 0.000 claims description 9
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- 238000000034 method Methods 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000001509 sodium citrate Substances 0.000 claims description 8
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
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- 229920001971 elastomer Polymers 0.000 abstract description 5
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- 235000011187 glycerol Nutrition 0.000 description 12
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
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- 238000002834 transmittance Methods 0.000 description 3
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- 238000001514 detection method Methods 0.000 description 2
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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
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- 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
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Abstract
The invention discloses a wearable flexible low-temperature-resistant self-driven electroluminescent system and a construction method thereof. The self-healing self-driven electroluminescent device is formed by taking self-healing and high-conductivity hydrogel as an upper electrode and a lower electrode, taking sandwich ZnS: cu fluorescent powder embedded polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) elastomer as a luminescent layer, and integrating the self-healing self-driven electroluminescent device with a friction nano generator constructed by taking silica gel encapsulated glycerol/KI solution as a liquid electrolyte to form a wearable flexible low-temperature-resistant self-driven electroluminescent system. The self-driven electroluminescent system constructed has stretchability (200%) and long-term freeze resistance. After being stored for six months at the low temperature of minus 20 ℃, the system can still emit bright blue-green light, and the system can be worn on different parts of a human body, and the worn friction nano generator is used for collecting the biomechanical energy to be converted into electric energy so as to drive and lighten the electroluminescent device.
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 considerable interest from researchers because of their ease of integration into 110/220V, 50/60 Hz ac power systems without the need for complex back-end electronics processing, as potential alternatives to dc-driven organic light emitting diodes. However, the electroluminescent devices reported at present mostly use an external alternating current power supply to supply power, the whole equipment is complex, the wearability of the whole device is difficult to realize, and the further application of the electroluminescent devices in practical life is limited. The friction nano generator is used as a power supply device of the electroluminescent device, so that energy generated in daily life of people is collected to supply power to the electroluminescent device, and the consumption of traditional energy sources is reduced.
Electroluminescent devices are important display devices, and have very wide applications in the fields of electronic devices, flexible displays, wearable devices, household appliances, and the like. Conventional electroluminescent devices generally use 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 under 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 actual life, the electroluminescent device needs to still work normally under severe conditions, so that the self-driven electroluminescent system with the wearable flexibility and low temperature resistance is researched and developed, and has 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 at low temperature.
In order to solve the problems, the invention adopts the following technical scheme:
a construction method of a wearable flexible low-temperature-resistant self-driven electroluminescent system comprises the following steps:
(1) Preparation of 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 mixture; wherein, the mass ratio of the gelatin to the NaCl is 1:1.17, and 9mL of water is needed for each 1g of gelatin;
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 formed in the step a, and soaking the hydrogel film into the solution in the step b for 2.5 to 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 luminescent layer; the mass ratio of PVDF-HFP particles to ZnS: cu powder is 1:1-1.6; 3mL of acetone was required per 0.5g PVDF-HFP particle; preferably, the ZnS: cu powder is used in an amount of 0.6 g, the PVDF-HFP particles have a mass of 0.5g, and the ZnS: cu powder has a particle diameter of 14.5.+ -. 0.2. Mu.m.
e. C, forming an electrode/luminescent layer/electrode three-layer sandwich structure by the electrode obtained in the step c and the luminescent layer in the step d, wherein the three-layer sandwich structure is the flexible low-temperature-resistant electroluminescent device;
(2) Preparation of a wearable low-temperature-resistant friction nano generator:
s1, pouring the uniformly mixed liquid silica gel and a matched curing agent thereof into a mold, and curing the liquid silica gel in room temperature to form silica gel with a concave middle part;
s2, peeling off the silica gel prepared in the step S1 from the die, placing a copper wire on the surface with the recess, extending the copper wire out of the silica gel, sealing two silica gel sheets with the recess together by liquid silica gel, and forming a cavity in the middle;
s3, injecting liquid electrolyte formed by dissolving KI in glycerol (Gly) into the cavity, so as to construct the wearable low-temperature-resistant friction nano generator;
(3) Construction of self-driven electroluminescent system
The copper wire of the friction nano generator is connected with one electrode layer of the flexible low-temperature-resistant 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 a self-driven electroluminescent system is constructed.
Further, in step S1, the curing agent occupies 3% of the volume of the liquid silica gel.
Further, the preparation process of the KI-Gly liquid electrolyte is as follows: KI was dissolved in glycerol (Gly) and the concentration of KI in glycerol (Gly) was 20wt%.
The wearable flexible low-temperature-resistant self-driven electroluminescent system constructed by the method has the advantages that 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 luminescent layer is 30mm multiplied by 30mm, and the thickness of the luminescent layer is 110 mu m; the size of the silica gel sheet in the friction nano generator is 50mm multiplied by 300mm, the thickness is 4mm, the size of the concave is 30mm multiplied by 260mm, and the depth is 1.8mm.
The method successfully prepares the wearable low-temperature-resistant friction nano generator.
According to the application 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, after the friction nano generator converts mechanical energy of human body movement into electric energy, the electroluminescent device is powered, and then the electroluminescent device displays bright blue-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, so that the traditional alternating current power supply is replaced; 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 luminescent layer, so that the whole device has excellent flexibility and stretchability; the low temperature resistant characteristic of the hydrogel can also have higher conductivity at low temperature, and the friction nano generator is formed by taking low temperature resistant KI/glycerol liquid electrolyte as an electrode, and still has higher output at-20 ℃, so that the prepared electroluminescent device driven by the wearable low temperature resistant 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, man-machine interaction, medical detection, intelligent robots and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of a wearable flexible low temperature resistant self-driven electroluminescent system of the present invention;
fig. 2 is an SEM image of the light-emitting layer in example 1;
FIG. 3 is a stress-strain curve of a hydrogel electrode;
FIG. 4 is the light transmittance of a hydrogel electrode;
FIG. 5 is a flow chart of the preparation of a wearable low temperature resistant friction nano-generator;
fig. 6 is a light emission spectrum of the electroluminescent device in example 1;
fig. 7 is a luminescence spectrum of a flexible low temperature resistant electroluminescent device according to the relative content of ZnS: cu, which is a phosphor, by changing the content of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles in the fixed luminescent layer in example 2;
FIG. 8 is a luminescence spectrum of a friction nano-generator of example 1 providing different voltages and different frequencies driving an electroluminescent device;
FIG. 9 is an optical image of the flexible low temperature resistant electroluminescent device of example 1 emitting light under different stretching;
FIG. 10 is a graph showing the change in conductivity at different temperatures of a hydrogel electrode of a flexible low temperature-resistant electroluminescent device of example 1;
FIG. 11 is an electrical output of a wearable low temperature friction-resistant nano-generator at a low temperature of-20 ℃;
fig. 12 is an optical image of the electroluminescent device of example 1 that is lit at low temperatures to emit light;
FIG. 13 is a long-term (6 months) stability test of the electroluminescent device of example 1 under low temperature conditions of-20 ℃;
FIG. 14 is an optical image of the light emitted by the patterned electroluminescent device of example 3;
fig. 15 is an optical image of the self-driven electroluminescent system of example 4 being worn on a different part of the human body to emit light.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
Example 1
A construction method of a wearable flexible low-temperature-resistant self-driven electroluminescent system comprises the following steps:
step one, 1g gelatin and 1.17 g NaCl particles were dissolved in 9mL 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 ℃ to freeze for half an hour to form the mixed solution.
Step two, mixing the glycerol and the water according to the 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 thirdly, taking out the hydrogel film formed in the first step, and soaking the hydrogel film into the solution obtained in the second step for 3 hours to obtain the electrode with the size of 30mm multiplied by 30mm and the thickness of 0.8mm.
Figures 3 and 4 show the light transmittance and stretchability of the hydrogels, respectively, and the stress strain of the prepared hydrogel electrodes is 280%, and the light transmittance can reach 92%, which meets the conditions required for stretchable electroluminescent device electrodes.
Step four, 0.5G polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) (purchase manufacturer: sorpe vitamin; model: G757) particles were dissolved in 3ml acetone, then 0.6G ZnS: cu powder (purchase manufacturer: shanghai Kogyo electro-optical technology Co., ltd.; particle size: 14.5.+ -. 0.2 μm) was added to the acetone, the resulting mixture was placed on a magnetic stirrer and stirred at a speed of 1000 r/min for at least 6 hours, finally the mixed solution was poured into a mold, dried at room temperature for 6 hours to form a film, and the SEM image of the luminescent layer was shown in FIG. 2, wherein ZnS: cu phosphor was completely embedded in the PVDF-HFP elastomer film, and the luminescent layer having a size of 30mm×30mm and a thickness of 110 μm was peeled off from the mold.
And fifthly, constructing an electrode/luminescent layer/electrode three-layer sandwich structure by the hydrogel electrode obtained in the step three and the luminescent layer obtained in the step four. As shown in figure 1, the electroluminescent device prepared by the invention consists of two transparent hydrogel electrodes and a luminescent layer, wherein the transparent hydrogel electrodes are NaCl doped with degradable gelatin hydrogel, and the luminescent layer mainly consists of ZnS: cu fluorescent powder embedded in a polymer elastomer polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) film. Fig. 6 shows the luminescence spectrum of the electroluminescent device, and the luminescence peak wavelength of the flexible low temperature resistant electroluminescence is 503 and nm.
Step six, pouring the uniformly mixed liquid silica gel (purchased from the Taida chemical raw materials Co., ltd., liquid silica gel model 883) and curing agent (the curing agent accounts for 3% of the volume of the liquid silica gel, purchased from the Taida chemical raw materials Co., ltd., the curing agent model 009) into a die with the size of 50mm multiplied by 300mm and the thickness of 4mm, wherein the middle part of the die is provided with a dent, and placing the die into room temperature for curing for 5 hours, thereby forming a silica gel sheet with the size of 50mm multiplied by 300mm and the thickness of 4mm, wherein the dent size in the silica gel sheet is 30mm multiplied by 260mm, and the depth is 1.8mm.
Step seven, peeling off the silica gel prepared in the step six from the die, placing a copper wire with the diameter of 0.2mm on the side with the recess, extending the copper wire out of the silica gel, and sealing two identical silica gels together by using liquid silica gel to form a cavity with the size of 30mm multiplied by 260 mm.
Step eight, 30ml of KI-Gly liquid electrolyte (KI is dissolved in glycerin (Gly) and the concentration of KI in the glycerin (Gly) is 20 wt%) is injected into the cavity, so that the wearable low-temperature-resistant friction nano generator is constructed. The structure of the obtained wearable low-temperature-resistant friction nano generator is shown in figure 5.
And step nine, connecting a copper wire of the friction nano generator with one electrode layer of the flexible low-temperature-resistant electroluminescent device, grounding the other electrode layer, and when the friction nano generator works, rubbing (equivalent to grounding) on the hand of an operator, as shown in fig. 1, realizing the integration of the friction nano generator and the electroluminescent device, thereby constructing the self-driven electroluminescent system.
Fig. 8 shows the corresponding luminescence intensity variation of the flexible low temperature resistant electroluminescent device (PVDF-HFP particles in an amount of 0.5g and zns: cu phosphor powder in an amount of 0.6 g) at different voltages and different frequencies provided by the tribo-nano-generator. As can be seen from fig. 8, the luminescence intensity of the flexible low temperature resistant electroluminescent device increases gradually with increasing voltage and frequency, and the spectrometer can detect the luminescence signal of the electroluminescent device at the lower frequency of 3.3 Hz when the voltage is 150V.
Fig. 9 shows luminescence optical images of flexible low temperature resistant electroluminescent devices at different levels of stretch. As can be seen from fig. 9, the flexible low temperature resistant electroluminescent device still works normally without significant change in brightness when stretched to 140%. This indicates that the flexible low temperature resistant electroluminescent device has excellent stretchability.
Fig. 10 shows the change in electrical conductivity of the electrodes of the flexible low temperature resistant electroluminescent device at different temperatures. As can be seen from fig. 10, as the temperature decreases, the movement rate of ions decreases, and the conductivity of the electrode of the electroluminescent device decreases, but still has a certain conductivity, so that the conditions required as the electrode of the electroluminescent device can be satisfied.
Fig. 11 shows that the wearable tribo-nano-generator still has a high electrical output at-20 ℃ and can provide the electrical energy required by the electroluminescent device at low temperature.
Fig. 12 shows an optical image of a flexible low temperature resistant electroluminescent device illuminated at low temperature. As can be seen from fig. 12, the luminescence of the flexible low temperature-resistant electroluminescent device is not affected as the temperature is reduced, and the flexible low temperature-resistant electroluminescent device can still operate normally when the temperature is reduced to-20 ℃.
Fig. 13 shows the optical stability of luminescence of the flexible electroluminescent device at-20 c, and as can be seen from fig. 13, the electroluminescent device can still emit bright blue-green light after being stored for 6 months in an environment of-20 c, and exhibits long-term stable luminescence performance.
Example 2
Five parts by mass of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) particles (manufacturer: sorpe; model: G757) of 0.5. 0.5G were dissolved in 3ml acetone, respectively, then 0.5G, 0.6G, 0.7G, 0.8G ZnS: cu phosphor powder (manufacturer: shanghai wet photoelectric technology Co., ltd.; particle size of 14.5.+ -. 0.2 μm) were added to the acetone, respectively, and the resultant mixture was placed on a magnetic stirrer and stirred at 1000 r/min for at least 6 hours, and then the solution was poured into a mold, and dried at room temperature for 6 hours to form a light-emitting layer having a size of 30mm×30mm and a thickness of 110. Mu.m. Finally, the formed light-emitting layer and the hydrogel electrode prepared in example 1 are combined in the order of electrode/light-emitting layer/electrode to form a flexible low-temperature-resistant electroluminescent device with a three-layer sandwich structure, and the light-emitting spectrum of the corresponding flexible low-temperature-resistant electroluminescent device is tested, and the result is shown in fig. 7.
Fig. 7 shows the effect of ZnS: cu phosphor content on luminous intensity in a wearable flexible low temperature resistant self-driven electroluminescent system (PVDF-HFP usage of 0.5 g). As can be seen from fig. 7, as the ZnS: cu phosphor amount increases, the luminous intensity of the flexible low temperature resistant electroluminescent device increases and then decreases. When the content of ZnS: cu phosphor is 0.6 and g, the luminous intensity of the flexible low-temperature-resistant electroluminescent device is the highest, and as the content of ZnS: cu phosphor is further increased, the luminous intensity of the flexible low-temperature-resistant electroluminescent device is weakened. With the increase of ZnS: cu fluorescent powder content, the electric field generated by the externally applied friction nano generator can excite more photon emission, thereby resulting in the increase of luminous intensity; when the content of ZnS: cu phosphor further increases, the aggregation of excessive luminescent particles may hinder luminescence.
Example 3
Step one, 1g gelatin and 1.17 g NaCl particles were dissolved in 9mL 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 freezing in a refrigerator at-4deg.C for half an hour to form.
Step two, mixing the glycerol and the water according to the 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 thirdly, taking out the hydrogel film formed in the first step, and soaking the hydrogel film into the solution obtained in the second step for 3 hours to obtain the panda pattern electrode, wherein the panda pattern electrode is 30mm multiplied by 55mm and has the thickness of 0.8mm.
Step four, using the preparation method of the light-emitting layer in example 1, a light-emitting layer with a size of 30mm×30mm and a thickness of 110 μm was obtained.
And fifthly, 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 optical images corresponding to the light emission of the 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 collects mechanical energy from human body movements, such as hand shots, elbow bends and knee bends, and the corresponding electroluminescent device shows real-time light emission, which represents 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 consumption of energy sources is reduced; in addition, the hydrogel is used as an electrode, the prepared hydrogel not only has high conductivity, the conductivity is 1.6S/m, but also has high transparency and stretchability, the selected friction nano generator still has certain conductive capacity at the temperature of minus 20 ℃, and the selected friction nano generator still has excellent electrical output at the temperature of minus 20 ℃, so that the luminous condition of the prepared wearable flexible low-temperature-resistant self-driven electroluminescent system at the temperature of minus 20 ℃ is not obviously changed. 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, man-machine interaction, medical detection, intelligent robots and the like.
Claims (7)
1. The construction method of the wearable flexible low-temperature-resistant self-driven electroluminescent system is characterized by comprising the following steps of:
(1) Preparation of 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 mixture;
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 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 from the template to obtain a composite luminescent layer; the mass ratio of PVDF-HFP particles to ZnS: cu powder is 1:1-1.6; 3mL of acetone was required per 0.5g PVDF-HFP particle;
e. c, forming an electrode/luminescent layer/electrode three-layer sandwich structure by the electrode obtained in the step c and the luminescent layer in the step d, wherein the three-layer sandwich structure is the electroluminescent device;
(2) Preparation of a wearable low-temperature-resistant friction nano generator:
s1, pouring the uniformly mixed liquid silica gel and a matched curing agent thereof into a mold, and curing the liquid silica gel in room temperature to form silica gel with a concave middle part;
s2, peeling off the silica gel prepared in the step S1 from the die, placing a copper wire on the surface with the recess, extending the copper wire out of the silica gel, sealing two silica gel sheets with the recess together by liquid silica gel, and forming 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 system
And connecting the copper wire of the friction nano generator with one electrode layer of the electroluminescent device, and grounding the other electrode layer to realize the integration of the friction nano generator and the electroluminescent device, thereby constructing the self-driven electroluminescent system.
2. The method for constructing a 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 each 1g of gelatin.
3. The method for constructing 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 mu m.
4. The method for constructing a wearable flexible low-temperature-resistant self-driven electroluminescent system according to claim 1, wherein in step S1, the curing agent occupies 3% of the volume of the liquid silica gel.
5. The method for constructing the wearable flexible low-temperature-resistant self-driven electroluminescent system according to claim 1, wherein the preparation process of the KI-Gly liquid electrolyte is as follows: KI was dissolved in glycerol and the concentration of KI in glycerol was 20wt%.
6. The wearable flexible low-temperature-resistant self-driven electroluminescent system constructed by the method according to any one of claims 1 to 5, wherein the size of an electrode in an electroluminescent device is 30mm×30mm, the thickness of the electrode is 0.8mm, the size of a light-emitting layer is 30mm×30mm, and the thickness of the light-emitting layer is 110 μm; the size of the silica gel sheet in the friction nano generator is 50mm multiplied by 300mm, the thickness is 4mm, the size of the concave is 30mm multiplied by 260mm, and the depth is 1.8mm.
7. Use of the self-driven electroluminescent system of claim 6 in a wearable device.
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