A flexible light-emitting device and a method for fabricating the same

Abstract

The application discloses a flexible light-emitting device and a preparation method thereof. The flexible light-emitting device comprises a flexible substrate layer, a flexible ion gel layer and a light-emitting layer which are sequentially stacked. The material of the flexible ion gel layer comprises a gel base and an ionic liquid. The gel base is selected from one or more of fluoro rubber, silica gel and hydrogel. The ionic liquid is selected from one or more of 1-ethyl-3-methyl imidazole bis-trifluoromethyl sulfonimide salt ionic liquid, 1-butyl-3-vinylimidazole tetrafluoroborate ionic liquid and 1-methyl-3-butyl imidazole hexafluorophosphate ionic liquid. The flexible ion gel layer and the flexible substrate layer are used as the electrode layer of the device as a whole, the thickness of the whole device is small and the flexibility is ensured. Compared with the common rigid light-emitting device, the flexibility of the flexible light-emitting device is greatly improved, and the application scene of the device is greatly improved. Compared with the common flexible light-emitting device, the single electrode method is used, so that the light-emitting resolution of the device is improved, and the displayed image can be controlled by setting a ground conductor on the light-emitting layer according to the need.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flexible electronic technology, and in particular to a flexible light-emitting device and a preparation method thereof. BACKGROUND

[0002] With the continuous improvement of people's living standards, the demand for light-emitting devices in various fields of life and industry is becoming more and more diversified. The existing light-emitting devices are mostly rigid light-emitting devices, which are not suitable for places with high conformability, narrowness or bending requirements, and have the problems of large size and difficulty in freely adjusting the size of the light-emitting device. The existing flexible light-emitting technology often needs to use specific electrodes and can only realize light-emitting of specific shapes, which cannot be applied to occasions with high resolution and variability of light-emitting patterns, and is limited in many application scenarios.

[0003] Therefore, it is necessary to provide a flexible high-resolution light-emitting device. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a flexible light-emitting device and a preparation method thereof, to solve the problem that the existing flexible light-emitting technology often needs to use specific electrodes and can only realize light-emitting of specific shapes.

[0005] The technical scheme adopted by the present application to solve the above technical problems is as follows:

[0006] In a first aspect of the present application, a flexible light-emitting device is provided, which comprises a flexible substrate layer, a flexible ion gel layer and a light-emitting layer arranged in sequence.

[0007] The material of the flexible ion gel layer comprises a gel base and an ionic liquid, the gel base is selected from one or more of fluoroelastomer, silicone and hydrogel, and the ionic liquid is selected from one or more of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid, 1-butyl-3-vinylimidazolium tetrafluoroborate ionic liquid and 1-methyl-3-butylimidazolium hexafluorophosphate ionic liquid.

[0008] Preferably, the flexible substrate layer comprises a substrate and an electrode arranged in sequence, the electrode is arranged in close contact with the flexible ion gel layer, and the material of the substrate is selected from one of polyethylene terephthalate, polyimide and polyurethane, and the material of the electrode is selected from one of silver, copper and carbon.

[0009] Preferably, the light-emitting material in the light-emitting layer is selected from one or both of ZnS:Cu fluorescent powder and ZnS:Mn fluorescent powder.

[0010] Preferably, the light emitting layer further comprises a dielectric material selected from one or more of barium titanate, aluminum oxide, strontium titanate.

[0011] In a second aspect of the present application, a method for preparing the flexible light emitting device is provided, the method comprising the following steps:

[0012] preparing a flexible substrate layer;

[0013] adding a cross-linking agent solution to a mixed solution of a gel base solution and an ionic liquid to obtain a flexible ionic gel solution, and spin-coating the ionic gel solution on the surface of the flexible substrate layer to obtain a flexible ionic gel layer;

[0014] mixing a light emitting material, a dielectric material and a curing agent to obtain a light emitting solution, and spin-coating the light emitting solution on the surface of the flexible ionic gel layer to obtain the flexible light emitting device.

[0015] Preferably, the cross-linking agent solution comprises a cross-linking agent and a solvent, and the concentration of the cross-linking agent is 4.76 wt%, the cross-linking agent is selected from one or more of 1,8-octanediamine, bisphenol AF / benzyltriphenylphosphonium chloride, and the solvent is selected from one or more of N-methyl-2-pyrrolidone, dimethyl sulfoxide and ethanol.

[0016] Preferably, the concentration of the gel base solution in the flexible ionic gel solution is 30 wt%-40 wt%.

[0017] Preferably, the mass ratio of the ionic liquid to the gel base is 1:2, 1:1, 2:1 or 3:1.

[0018] Preferably, the mass ratio of the light emitting material, the dielectric material and the gel base is (1:0:1)-(1:2:1).

[0019] Preferably, in the step of spin-coating the ionic gel solution on the surface of the flexible substrate layer, the spin-coating speed is 500-3000 revolutions per minute, and in the step of spin-coating the light emitting solution on the surface of the flexible ionic gel layer, the spin-coating speed is 500-4000 revolutions per minute.

[0020] Advantages:

[0021] The application discloses a flexible light-emitting device and a preparation method thereof, in order to meet the preparation requirement of the flexible light-emitting device, the application uses a flexible ion gel layer and a flexible substrate layer as the electrode layer of the device, the overall device thickness is small and the flexibility is ensured; compared with the common rigid light-emitting device, the flexibility of the flexible light-emitting device provided by the application greatly improves the applicable scene of the device; compared with the common flexible light-emitting device, the application uses a single electrode method, so that the light-emitting resolution of the device is improved, and the displayed image can be controlled on the light-emitting layer according to the requirement. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structure diagram of the flexible light-emitting device prepared by the preferred embodiment of the application is shown, 1 is a flexible substrate layer, 2 is a flexible ion gel layer, and 3 is a light-emitting layer.

[0023] Figure 2 A silver frame schematic diagram of the PET / Ag substrate layer in the preferred embodiment of the application is shown.

[0024] Figure 3 A performance test result diagram of the flexible light-emitting device prepared by the embodiments 1-8 of the application is shown, (a) is the change of the light-emitting brightness with the voltage size under 1 kHz, and (b) is the change of the light-emitting with the frequency under 1200V peak-peak AC voltage. DETAILED DESCRIPTION

[0025] The application provides a flexible light-emitting device and a preparation method thereof, in order to make the purpose, technical scheme and effect of the application more clear and definite, the application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the application and are not used to limit the application.

[0026] The embodiment of the application provides a flexible light-emitting device, as shown in the figure, the flexible light-emitting device comprises a flexible substrate layer 1, a flexible ion gel layer 2 and a light-emitting layer 3 which are sequentially stacked. Figure 1 The flexible light-emitting device comprises a flexible substrate layer 1, a flexible ion gel layer 2 and a light-emitting layer 3 which are sequentially stacked.

[0027] The material of the flexible ion gel layer comprises a gel base and an ionic liquid, the gel base is selected from one or more of fluoro rubber, silica gel and hydrogel, and the ionic liquid is selected from one or more of 1-ethyl-3-methyl imidazole bis-trifluoromethyl sulfonimide salt ionic liquid, 1-butyl-3-vinyl imidazole tetrafluoroborate ionic liquid and 1-methyl-3-butyl imidazole hexafluorophosphate ionic liquid.

[0028] The embodiment of the present application realizes the overall flexibility of the device by designing the flexible ion gel layer and the light-emitting layer, solves the poor conformability problem of common light-emitting devices; the flexible light-emitting device prepared by the embodiment of the present application has the characteristics of high light-emitting resolution, solves the poor image recognition degree problem of the commercially available optical fingerprint collection equipment; the embodiment of the present application realizes the contact light-emitting of the device through the structural design of the flexible light-emitting device, solves the problem that the common electroluminescent device is too dependent on the electrode shape and has low resolution, specifically, the existing electroluminescent device is generally of an electrode-light-emitting-electrode structure, and basically the light-emitting region is the light-emitting region of the overlapping region of the two electrodes, and after removing one electrode, the embodiment of the present application can control the shape of the other electrode, and when pressing the finger, the finger is equivalent to the electrode, so the light-emitting overlapping part of the fingerprint region can emit light.

[0029] The embodiment of the present application uses fluororubber and other substances to prepare the flexible ion gel layer, has good tensile property and corrosion resistance, and at the same time has good high-temperature resistance and can withstand 200 DEG C high temperature. Using the flexible ion gel layer as the electrode layer can increase the flexibility of the whole light-emitting device, can withstand certain bending and be attached to different surfaces, and at the same time can be well attached to the light-emitting layer, to ensure the resolution of light-emitting.

[0030] In some embodiments, the flexible substrate layer comprises a substrate and an electrode arranged in a stacked manner, the electrode is attached to the flexible ion gel layer, the material of the substrate is selected from one of polyethylene terephthalate, polyimide and polyurethane, and the material of the electrode is selected from one of silver, copper and carbon.

[0031] The flexible substrate layer is used to make the input alternating current more evenly distributed in the flexible ion gel layer, so that the light-emitting region is more extended. And the size and pattern of the electrode in the layer are changed, and a larger electrode area can increase the contact area with the gel electrode, to provide more uniform alternating current distribution.

[0032] In some embodiments, the light-emitting material in the light-emitting layer is selected from one or both of ZnS:Cu fluorescent powder and ZnS:Mn fluorescent powder.

[0033] The light-emitting material will affect the light-emitting performance and light-emitting type of the flexible light-emitting device. Specifically, the addition of ZnS:Cu powder can make the light-emitting color of the light-emitting device present blue-green, and the addition of ZnS:Mn powder can make the light-emitting color of the light-emitting device present orange-red, and with the addition of the light-emitting material, the overall light-emitting uniformity and intensity will be improved.

[0034] In some embodiments, the light-emitting layer further comprises a dielectric material, and the dielectric material is selected from one or more of barium titanate, aluminum oxide and strontium titanate.

[0035] By introducing a certain amount of dielectric material with high dielectric constant, the electric field in the light-emitting layer can be concentrated. Specifically, barium titanate has a small size, which can be dispersed around the luminescent material particles after being added, thereby enhancing the electric field intensity around the luminescent material under alternating electric field conditions and enhancing the overall light-emitting capability.

[0036] The preparation method of the flexible light-emitting device is provided, and the preparation method comprises the following steps:

[0037] Preparation of a flexible substrate layer;

[0038] A cross-linking agent solution is added to a mixed solution of a gel base solution and an ionic liquid to obtain a flexible ionic gel solution, and the ionic gel solution is spin-coated on the surface of the flexible substrate layer to obtain a flexible ionic gel layer.

[0039] A luminescent material, a dielectric material, and a curing agent are mixed to obtain a luminescent solution, and the luminescent solution is spin-coated on the surface of the flexible ionic gel layer to obtain the flexible light-emitting device.

[0040] In some embodiments, the cross-linking agent solution comprises a cross-linking agent and a solvent, and the concentration of the cross-linking agent is 4.76 wt%. The cross-linking agent is selected from one of 1,8-octanediamine, bisphenol AF, and benzyltriphenylphosphonium chloride, and the solvent is selected from one or more of N-methyl-2-pyrrolidone, dimethyl sulfoxide, and ethanol.

[0041] The amount of the added cross-linking agent changes the curing speed of the flexible ionic gel layer. Too much cross-linking agent added will cause the gel to cure too quickly during mixing, which is not convenient for subsequent spin-coating into a film. Too little cross-linking agent added will cause the gel to be difficult to form a film, increasing the film formation time.

[0042] In some embodiments, the concentration of the gel base solution in the flexible ionic gel solution is 30 wt%-40 wt%.

[0043] In some embodiments, the mass ratio of the ionic liquid to the gel base is 1:2, 1:1, 2:1, or 3:1.

[0044] The amount of the added ionic liquid affects the conductivity and modulus of the flexible ionic gel layer, thereby changing the light-emitting intensity of the flexible light-emitting device. Specifically, as the ionic liquid is added, the conductivity of the flexible ionic gel layer gradually increases, and the gel modulus gradually decreases

[0045] In some embodiments, the mass ratio of the luminescent material, the dielectric material, and the gel base is (1:0:1)-(1:2:1).

[0046] The ratio of the above components will affect the light emitting intensity and transparency of the flexible light emitting device. Specifically, when the dielectric material ratio is small, the light emitting intensity of the light emitting device gradually increases with the addition of the node material; when the dielectric material ratio is too high, the light emitting intensity of the light emitting device reaches a peak, and then will decrease. The transparency of the device will continue to decrease with the increase of the dielectric material ratio.

[0047] In some embodiments, the speed of spin coating in the step of spin coating the ion gel solution on the surface of the flexible substrate layer is 500-3000 revolutions per minute, and the speed of spin coating in the step of spin coating the light emitting solution on the surface of the flexible ion gel layer is 500-4000 revolutions per minute.

[0048] The spin coating speed will affect the thickness of the flexible ion gel layer and thus the light emitting intensity of the flexible light emitting device; the spin coating speed will affect the thickness of the light emitting layer and thus the light emitting intensity and transparency of the flexible light emitting device, etc.

[0049] The technical solutions in the embodiments of the present application will be described below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments, and are only used to illustrate the present application and do not limit the present application at all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] Embodiment 1

[0051] A flexible light emitting device is prepared, comprising the following steps:

[0052] (1) Preparation of polyethylene terephthalate / silver (PET / Ag) flexible substrate layer: silver paste is printed on the PET hydrophilic surface using screen printing, the pattern adopts a 4.5 cm×4.5 cm hollow silver frame, see Figure 2 , in which one corner extends out a silver electrode for external power supply, and after printing, an oven is used for drying at 110°C for standby;

[0053] (2) Preparation of flexible ionogel layer: the PET / Ag substrate prepared above is fixed on the glass substrate using a traceless tape, which should limit the spin coating area along the silver frame; 0.05 g of 1,8-octanediamine is dissolved in 1 g of N-methyl-2-pyrrolidone (NMP) as a crosslinking agent, and ultrasonic treatment is performed for 5 minutes, then 10 g of 30 wt% concentration of type 26 fluororubber / acetic acid ethyl ester solution and 3 g of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imidate ionic liquid are added, and magnetic stirring is performed at 300 rpm for 20 minutes, the obtained solution is spin coated on the PET / Ag substrate after ultrasonic defoaming, the rotation speed is 2000 rpm, and the time is 20 seconds, the traceless tape is removed after spin coating, and the product is cured at 110°C for 1 hour to obtain the flexible ionogel layer;

[0054] (3) Preparation of light-emitting layer: the flexible ionogel layer prepared above is fixed on the glass substrate using a traceless tape, and the range of the tape should be slightly larger than the flexible ionogel layer; the Ecoflex 00-30 precursor and the crosslinking agent are mixed in a mass ratio of 1:1, and then stirred with a glass rod for 5 minutes to obtain an Ecoflex solution, the ZnS:Cu fluorescent powder and the barium titanate powder are mixed with the Ecoflex solution in a mass ratio of 1:1:1, and then stirred with a glass rod for 15 minutes, the obtained solution is placed in a vacuum degassing machine for 15 minutes to eliminate bubbles, and then spin coated on the flexible ionogel layer, the spin coating speed is 2000 rpm, and the time is 20 seconds, the traceless tape is removed after spin coating, and the product is cured at 80°C for 15 minutes to obtain the flexible light-emitting device.

[0055] Example 2

[0056] A flexible light-emitting device is prepared, comprising the following steps:

[0057] (1) Preparation of polyethylene terephthalate / silver (PET / Ag) flexible substrate layer: silver paste is printed on the PET hydrophilic surface using silk screen printing, and the pattern adopts a 4.5 cm×4.5 cm hollow silver frame, wherein a silver electrode is extended from a corner for external power supply, and the printing is completed using an oven at 110°C for drying for standby;

[0058] (2) Preparation of flexible ionogel layer: the PET / Ag substrate prepared above was fixed on a glass substrate using a traceless tape, and the tape should limit the spin coating area along the silver frame; a solution with a mass ratio of bisphenol AF: benzyltriphenylphosphonium chloride: ethanol of 1:4:35 was prepared as a crosslinking agent, ultrasonic treatment for 5 minutes, 0.8 g was taken and 10 g of 40 wt% concentration of fluororubber type 26 / ethyl acetate solution and 4 g of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imidazolium ionic liquid were added, and a planetary centrifuge was used at 2100 rpm for 5 min to mix it uniformly, the obtained solution was spin coated on the PET / Ag substrate after ultrasonic defoaming, the rotation speed was 1500 rpm, and the time was 20 seconds, the traceless tape was removed after spin coating, and it was cured at 110°C for 1 hour to prepare the flexible ionogel layer;

[0059] (3) Preparation of light-emitting layer: the flexible ionogel layer prepared above was fixed on a glass substrate using a traceless tape, and the tape should limit the range to be slightly larger than the flexible ionogel layer; the Ecoflex 00-30 precursor and the crosslinking agent were mixed according to a mass ratio of 1:1, and a glass rod was used to stir for 5 minutes to obtain an Ecoflex solution, the ZnS:Cu fluorescent powder and barium titanate powder were mixed with the above Ecoflex solution according to a mass ratio of 1:1:1, and a glass rod was used to stir for 15 minutes, the obtained solution was placed in a vacuum degassing machine for 15 minutes to eliminate bubbles, and then spin coated on the flexible ionogel layer, the spin coating speed was 2000 rpm, and the time was 20 seconds, the traceless tape was removed after spin coating, and it was cured at 80°C for 15 minutes to prepare the flexible light-emitting device.

[0060] Example 3

[0061] A flexible light-emitting device was prepared, comprising the following steps:

[0062] (1) Preparation of polyethylene terephthalate / silver (PET / Ag) flexible substrate layer: silver paste was printed on the PET hydrophilic surface using silk screen printing, and the pattern adopted a 4.5 cm×4.5 cm hollow silver frame, and a silver electrode was extended from a corner for external power supply, and after printing, an oven was used for drying at 110°C for standby;

[0063] (2) Preparation of flexible ionogel layer: the PET / Ag substrate prepared above was fixed on a glass substrate using a traceless tape, and the traceless tape should limit the spin-coating area along the silver frame; a solution with a mass ratio of bisphenol AF: benzyltriphenylphosphonium chloride: ethanol of 1:4:35 was prepared as a crosslinking agent, ultrasonic treatment was performed for 5 minutes, 0.8 g was taken and 10 g of a 40 wt% concentration of fluororubber type 26 / ethyl acetate solution and 4 g of 1-ethyl-3-methylimidazolium bistrifluoromethylsulfonylimide ionic liquid were added thereto, a planetary centrifuge was used for centrifugation at 2100 rpm for 5 min to uniformly mix them, the obtained solution was spin-coated on the PET / Ag substrate after ultrasonic defoaming, the rotation speed was 1500 rpm, and the time was 20 seconds, the traceless tape was removed after spin-coating, and the sample was cured at 110°C for 1 hour to obtain the flexible ionogel layer;

[0064] (3) Preparation of light-emitting layer: the flexible ionogel layer prepared above was fixed on a glass substrate using a traceless tape, and the traceless tape should limit the range to be slightly larger than the flexible ionogel layer; polydimethylsiloxane (Dow Corning DC184) precursor and crosslinking agent were mixed according to a mass ratio of 10:1, and a glass rod was used for stirring for 5 minutes to obtain a polydimethylsiloxane solution, ZnS:Cu fluorescent powder and barium titanate powder were mixed with the above polydimethylsiloxane solution according to a mass ratio of 1:1:1, a glass rod was used for stirring for 20 minutes, the obtained solution was placed in a vacuum defoaming machine for 15 minutes to eliminate bubbles, and then spin-coated on the flexible ionogel layer, the spin-coating speed was 2000 rpm, and the time was 20 seconds, the traceless tape was removed after spin-coating, and the sample was cured at 80°C for 15 minutes to obtain the flexible light-emitting device.

[0065] Example 4

[0066] A flexible light-emitting device was prepared, and the steps of this embodiment were basically the same as those of Example 1, except that no dielectric material was added in step (3).

[0067] Example 5

[0068] A flexible light-emitting device was prepared, and the steps of this embodiment were basically the same as those of Example 1, except that in step (2), 6 g of 1-ethyl-3-methylimidazolium bistrifluoromethylsulfonylimide ionic liquid was used, i.e., the mass ratio of fluororubber to 1-ethyl-3-methylimidazolium bistrifluoromethylsulfonylimide ionic liquid was 1:2.

[0069] Example 6

[0070] The preparation of a flexible light-emitting device is basically the same as that in Example 1, except that in step (2), 9g of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt ionic liquid is used, that is, the mass ratio of fluororubber to 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt ionic liquid is 1:3.

[0071] Example 7

[0072] The preparation of a flexible light-emitting device is basically the same as that in Example 1, except that in step (3), the mass ratio of ZnS:Cu fluorescent powder, barium titanate powder and Ecoflex solution is 1:0.5:1.

[0073] Example 8

[0074] The preparation of a flexible light-emitting device is basically the same as that in Example 1, except that in step (3), the mass ratio of ZnS:Cu fluorescent powder, barium titanate powder and Ecoflex solution is 1:2:1.

[0075] The flexible light-emitting devices prepared in Examples 1-8 were subjected to performance tests. The test method was to connect the silver electrode extending on the PET / Ag substrate with an AC power supply. When the light-emitting layer was touched with a finger, a clear and bright fingerprint light pattern could be seen on the bottom surface. The light intensity could be changed with the applied voltage, and the light emission frequency could be changed with the applied AC frequency.

[0076] like Figure 3 As shown, Figure 3 (a) shows the change in luminance as a function of voltage at 1 kHz. The figure shows that the overall luminous intensity increases with increasing voltage. Figure 3 In Figure (b), the change in light emission with frequency under a peak-to-peak AC voltage of 1200V is shown. The figure indicates that as the voltage and frequency increase, the light emission color gradually changes from green to blue.

[0077] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A flexible light-emitting device, characterized in that, The flexible light-emitting device comprises a flexible substrate layer, a flexible ionogel layer and a light-emitting layer which are sequentially stacked; The material of the flexible ionogel layer comprises a gel base and an ionic liquid, the gel base is selected from one or more of fluoroelastomer, silicone gel and hydrogel, and the ionic liquid is selected from one or more of 1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl imide) ionic liquid, 1-butyl-3-vinylimidazolium tetrafluoroborate ionic liquid and 1-methyl-3-butylimidazolium hexafluorophosphate ionic liquid. The flexible substrate layer comprises a substrate and an electrode which are stacked, the electrode is arranged in close contact with the flexible ionogel layer, the material of the substrate is selected from one of polyethylene terephthalate, polyimide and polyurethane, and the electrode is a hollow silver frame, one corner of the electrode extends out of a silver electrode for external power supply. When the flexible light-emitting device is used, the silver electrode is connected by an alternating current power supply, and a clear and bright light-emitting pattern can be seen on the bottom surface by touching the light-emitting layer with a finger.

2. The flexible light-emitting device according to claim 1, wherein The light-emitting material in the light-emitting layer is selected from one or both of ZnS:Cu fluorescent powder and ZnS:Mn fluorescent powder.

3. The flexible light-emitting device according to claim 2, wherein The light-emitting layer further comprises a dielectric material selected from one or more of barium titanate, aluminum oxide and strontium titanate.

4. A method of fabricating the flexible light-emitting device according to claim 1, characterized by, The preparation method comprises the following steps: Preparation of a flexible substrate layer; A crosslinking agent solution is added to a mixed solution of a gel base solution and an ionic liquid to obtain a flexible ionogel solution, and the ionogel solution is spin-coated on the surface of the flexible substrate layer to obtain a flexible ionogel layer; A light-emitting material, a dielectric material and a curing agent are mixed to obtain a light-emitting solution, and the light-emitting solution is spin-coated on the surface of the flexible ionogel layer to obtain the flexible light-emitting device.

5. The method for fabricating a flexible light-emitting device according to claim 4, characterized in that, The crosslinking agent solution comprises a crosslinking agent and a solvent, and the concentration of the crosslinking agent is 4.76wt%, the crosslinking agent is selected from one of 1,8-octanediamine and bisphenol AF / benzyl triphenyl phosphonium chloride, and the solvent is selected from one or more of N-methyl-2-pyrrolidone, dimethyl sulfoxide and ethanol.

6. The method for fabricating a flexible light-emitting device according to claim 4, characterized in that, In the flexible ionogel solution, the concentration of the gel base solution is 30wt%-40wt%.

7. The method for fabricating a flexible light-emitting device according to claim 4, characterized in that, The mass ratio of the ionic liquid to the gel base is 1:2, 1:1, 2:1 or 3:

1.

8. The method for fabricating a flexible light-emitting device according to claim 4, characterized in that, The mass ratio of the light-emitting material, the dielectric material and the gel base is (1:0:1)-(1:2:1).

9. The preparation method of the flexible light-emitting device according to claim 4, wherein In the step of spin-coating the ionogel solution on the surface of the flexible substrate layer, the spin-coating speed is 500-3000 revolutions per minute, and in the step of spin-coating the light-emitting solution on the surface of the flexible ionogel layer, the spin-coating speed is 500-4000 revolutions per minute.

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