An organic ion gel with high ionic conductivity, stretchability and long phosphorescent lifetime based on anion-induced phase separation strategy and preparation and application thereof

Abstract

The application discloses a kind of full-color organic ion gel based on anion-induced phase separation strategy of high ionic conductivity, stretchability and long phosphorescence lifetime and application thereof, which comprises: introducing anions in a polymer ion solution containing a large number of hydroxyl groups, inducing molecular chain rearrangement by freeze-thaw and low-temperature drying, and constructing an ion liquid enrichment zone and a polymer enrichment zone, wherein the highly solvated ion liquid enrichment zone is a soft phase, which bears elastic deformation and ion transport function, and the polymer enrichment zone is a hard phase, which bears mechanical load and induces phosphorescence emission.The application solves the problems of poor mechanical properties, non-stretchability and short phosphorescence lifetime of existing phosphorescent materials, and synergistically improves the mechanical properties and phosphorescent properties of ion gel.The prepared ion gel has excellent environmental tolerance, recyclability and responsiveness;using its multicolor phosphorescent display and responsive electrical signals, it can be used to construct soft robots and information encryption devices with dual-channel information interaction.

Description

TECHNICAL FIELD

[0001] The present application relates to a phosphorescent material with tensile properties, in particular to a high ionic conductivity, stretchable and long phosphorescent lifetime organic ion gel based on anion-induced phase separation strategy and its preparation and application. BACKGROUND

[0002] Traditional room temperature phosphorescent materials are mostly inorganic, such as rare earth materials, etc., which have high cost, high toxicity and limited application range; in recent years, organic phosphorescent materials have been widely concerned due to their excellent processing properties, low toxicity and other advantages. Among them, in order to achieve efficient phosphorescent emission, a rigid polymer network is usually used to fix the triplet state of the luminescent group. As a result, most phosphorescent materials are rigid and brittle materials without deformation ability. In view of the above problems, self-assembly, polymer-induced crystallization and other strategies are used to construct elastic hydrogels with room temperature phosphorescent properties. However, they still have the disadvantages of easy evaporation of water and poor low-temperature resistance. Ion gel is a material system with polymer as three-dimensional network structure and ionic liquid as solvent, which has the advantages of non-volatility, flame retardancy, high ionic conductivity, etc., and has been widely concerned. On this basis, the construction of ion gel with long phosphorescent lifetime and excellent mechanical properties is of great significance to the next generation of bionic robots, human-computer interaction and other fields. However, the above goal is not easy to achieve, because the rigid structure required by long phosphorescent lifetime is in conflict with the flexibility of ion gel. Therefore, a technical means is urgently needed to simultaneously realize the synergistic improvement of mechanical properties and phosphorescent properties in ion gel. SUMMARY

[0003] The purpose of the present application is to provide a high ionic conductivity, stretchable and long phosphorescent lifetime organic ion gel based on anion-induced phase separation strategy and its preparation and application, to solve the problems of poor mechanical properties, non-stretchability and short phosphorescent lifetime of existing phosphorescent materials, and to realize the purposes of high ionic conductivity (≥1 S / m), environmental tolerance, recyclability, long phosphorescent lifetime (≥100 ms) and stretchability (≥400%). The multi-color phosphorescent imaging and stimulus-responsive electrical signals are used to construct electronic skin and encrypted keyboard based on color and electrical signal dual-channel interaction.

[0004] In order to achieve the above purpose, the present application provides a preparation method of stretchable phosphorescent material, which comprises:

[0005] (1) configuring a high-molecular solution containing hydroxyl, adding a luminescent group solution after the solution is clear, adding inorganic salt and stirring until the solution is clear to obtain a precursor solution; the high-molecular containing hydroxyl is any one or more than two of cellulose, chitosan, cellulose derivative, polyvinyl alcohol, polyacrylic acid and polymethacrylic acid; the ionic liquid is any one or more than two of 1-ethyl-3-methyl imidazolium chloride, 1-ethyl-3-methyl imidazole bromide or 1-ethyl-3-methyl imidazole acetate, 1-allyl-3-methyl imidazole chloride and 1-butyl-3-methyl imidazole chloride; the luminescent group is any one or more than two of isothiocyanate, rhodamine, pyrene tetramic anhydride, polyacrylic acid, polyacrylamide, naphthalene dicarboxylic anhydride and pyrene butyric acid; the inorganic salt is any one or more than two of sodium carbonate, sodium sulfate, trisodium citrate, sodium chloride, potassium chloride and potassium sulfate; the concentration of inorganic salt is 0.1% to 2%, and the mass ratio of the ionic liquid, the luminescent group solution and the inorganic salt is (10 to 100) : 1 : 1.

[0006] (2) obtaining an organic ionic gel after the precursor solution is frozen and thawed and dried at low temperature.

[0007] Preferably, in the high-molecular solution containing hydroxyl, the concentration of the high-molecular solution containing hydroxyl is 0.1% to 15%, and the mass ratio of the high-molecular solution containing hydroxyl and the ionic liquid is 100 : (1 to 99).

[0008] Preferably, the concentration of the luminescent group solution is 0.1% to 5%. With the increase of inorganic salt, the toughness and stress of the ionic gel are increased, but excessive inorganic salt will decrease the toughness and stress of the ionic gel.

[0009] Preferably, the high-molecular containing hydroxyl is polyvinyl alcohol, the ionic liquid is 1-ethyl-3-methyl imidazolium chloride, the luminescent group is polyacrylamide, and the inorganic salt is sodium chloride.

[0010] Preferably, in the high-molecular solution containing hydroxyl, the mass ratio of the high-molecular containing hydroxyl and the solvent is (0.1 to 1) : 10.

[0011] Preferably, the freezing and thawing temperature is -30°C to 0°C; the drying temperature is 40°C to 80°C; and the drying time is 0.1h to 12h.

[0012] The present application provides a stretchable phosphorescent material prepared by the preparation method.

[0013] Preferably, the stretchable phosphorescent material has a microphase separation structure.

[0014] The application provides application of the stretchable phosphor material as described in preparation of electronic skin, anti-counterfeiting patterns and stress and strain sensors.

[0015] Preferably, the application comprises a wearable electronic device.

[0016] The application provides an organic ion gel with high ionic conductivity, stretchability and long phosphorescent lifetime based on an anion-induced phase separation strategy, and preparation and application thereof, solves the problems of poor mechanical property, non-stretchability and short phosphorescent lifetime of existing phosphorescent materials, and has the following advantages:

[0017] 1. The construction of stretchable room-temperature phosphorescent ion gel is realized, in addition to high ionic conductivity (≥1 S / m), the phosphorescent lifetime is more than 110 ms, the tensile strength is 9 MPa, and the elongation at break is more than 400%;

[0018] 2. Excellent environmental tolerance, high elasticity (elongation at break more than 300%) and phosphorescent emission performance at zero temperature.

[0019] 3. Repeated processing, still excellent phosphorescent performance, and non-decay of phosphorescent lifetime. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a phosphorescent graph of the application example 1 under the stretching condition.

[0021] Figure 2 It is a SEM graph of the gel of the application examples 1-2 and the comparative examples 1-2.

[0022] Figure 3 It is a stress graph of the gel of the application examples 1-2 and the comparative examples 1-3.

[0023] Figure 4 It is a phosphorescent lifetime graph of the gel of the application examples 1-2 and the comparative examples 1-2.

[0024] Figure 5 It is a full-color phosphorescent graph of the application examples 1 and 3.

[0025] Figure 6 It is a phosphorescent graph of the application example 3 under the stretching condition.

[0026] Figure 7 It is a mechanical property graph of the application examples 1 and 3 at low temperature (-20 DEG C).

[0027] Figure 8 It is a phosphorescent graph of the application examples 1 and 3 before and after recycling.

[0028] Figure 9 It is a situation of the gel of the application example 1 responding to external stimulation at room temperature.

[0029] Figure 10 Application demonstration chart for the gel of the present application Example 4.

[0030] Figure 11 Application demonstration chart for the gel of the present application Example 5.

[0031] Figure 12 Conductivity chart for the gels of the present application Examples 1-2 and Comparative Examples 1-3.

[0032] Figure 13 Toughness and tensile strength chart for the gels of the present application Examples 1-2 and Comparative Examples 1-3. DETAILED DESCRIPTION

[0033] The technical solutions in the examples of the present application will be described clearly and completely below. Obviously, the described examples are only some of the examples of the present application, but not all the examples. Based on the examples in the present application, all other examples obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] The sources of the reagents involved in the following examples are as follows:

[0035] Polyvinyl alcohol (PVA-1799) (polymerization degree 1700, alcoholysis degree 99%), polyacrylamide (PAM), N,N-dimethylformamide (DMF) and methyl sulfoxide (DMSO) were all purchased from Chengdu Kelin Chemical Co., Ltd.

[0036] Sodium chloride (NaCl) (purity 99.5%), 1-ethyl-3-methylimidazolium chloride and 1,8-naphthalene dicarboxylic anhydride (1,8-NA) were all purchased from Shanghai Maikelin Biochemical Co., Ltd. (China).

[0037] 1-pyrene butyric acid (PyBA) was purchased from Shanghai Haohong Science and Technology Co., Ltd.

[0038] Example 1

[0039] A preparation method of an organic ion gel with high ionic conductivity, stretchability and long phosphorescent lifetime based on an anion-induced phase separation strategy, the method comprising:

[0040] (1) 2 g of polyvinyl alcohol (PVA) was dissolved in 10 mL of deionized water to obtain a PVA solution, 2 g of 1-ethyl-3-methylimidazolium chloride was added to the PVA solution, and after the solution was clear, 2 mL of a polyacrylamide (PAM) solution with a mass fraction of 5% was added, and finally 0.3 g of sodium chloride was added and stirred until the solution was clear to obtain a precursor solution.

[0041] (2) The precursor solution was transferred to a tetrafluoroethylene mold, frozen and thawed at -20°C, and then kept warm in a 60°C oven for 6 hours to obtain an ion gel, which was denoted as PVA / PAM-NaIL 1 gel.

[0042] Example 2

[0043] The preparation method of an organic ionic gel with high ionic conductivity, stretchability and long phosphorescence lifetime based on anion-induced phase separation strategy is basically the same as that in Example 1, except that:

[0044] In step (1), the amount of sodium chloride added is adjusted from 0.3g to 0.5g;

[0045] The gel obtained by the same procedure as in Example 1 is designated as PVA / PAM-NaIL 2.

[0046] Comparative Example 1

[0047] The preparation method of an organic ionic gel is basically the same as that in Example 1, except that:

[0048] In step (1), sodium chloride is not added;

[0049] The gel obtained by the same procedure as in Example 1 is denoted as PVA / PAM-IL.

[0050] Comparative Example 2

[0051] The preparation method of a room temperature phosphorescent thin film is basically the same as that in Example 1, except that:

[0052] In step (1), 1-ethyl-3-methylimidazolium chloride is not added;

[0053] The thin film obtained by the same operation as in Example 1 is denoted as PVA / PAM-Na.

[0054] Comparative Example 3

[0055] The preparation method of an organic ionic gel is basically the same as that in Example 1, except that:

[0056] In step (1), the amount of sodium chloride added is adjusted from 0.3g to 0.6g;

[0057] The gel obtained by the same procedure as in Example 1 is designated as PVA / PAM-NaIL 3.

[0058] Example 3

[0059] The preparation method of an organic ionic gel with high ionic conductivity, stretchability and long phosphorescence lifetime based on anion-induced phase separation strategy is basically the same as that in Example 1, except that:

[0060] In step (1), the 2 mL volume and 5% mass polyacrylamide (PAM) solution is adjusted to 2 mL volume and 5% mass o-carbamoylbenzoic acid (NPA) or 2 mL volume and 5% mass phenylbutyric acid (PyBA).

[0061] Following the same procedures as in Example 1, the resulting gels were designated as PVA / NPA-NaIL and PVA / PyBA-NaIL.

[0062] Example 4

[0063] The preparation method of a dual-signal-path soft robot motion monitoring material is basically the same as that in Example 1, except that:

[0064] Following the same procedure as in Example 1, the obtained gels were encapsulated in polydimethylsiloxane (PDMS) and then adhered to the joints of the soft robot's manipulator.

[0065] Example 5

[0066] The preparation method of the anti-counterfeiting encrypted keyboard is basically the same as that in Example 1, except that:

[0067] Following the same procedure as in Example 1, the obtained gels were placed in molds and kept at 100°C and 5 kPa pressure for 1 hour. After being encapsulated with PDMS, the gels were connected to wires.

[0068] SEM characterization of materials in Experiment Example 1

[0069] The gels of Examples 1-2 and Comparative Examples 1-2 of the present invention were characterized by SEM. The morphology of the ion gels was studied using a 10.0 kV field emission SEM (ZEISS GeminiSEM 360).

[0070] like Figure 2 The images show SEM images of the gels from Examples 1-2 and Comparative Examples 1-2 of this invention. PVA / PAM-NaIL 1 is the gel prepared in Example 1; PVA / PAM-NaIL 2 is the gel prepared in Example 2; PVA / PAM-IL is the gel prepared in Comparative Example 1; and PVA / PAM-Na is the gel prepared in Comparative Example 2. The blue areas in the images represent regions enriched with polymer chains, and the red areas represent regions enriched with ionic liquids. Figure 2 It can be seen that Examples 1 and 2 exhibit obvious phase separation structures, while Comparative Examples 1 and 2 do not show obvious microphase separation structures. This is because the introduction of salting-out anions can generate strong interactions with PVA molecular chains, inducing the formation of hydrogen bonds in PVA molecular chains on the one hand, and excluding free ionic liquids from the molecular chain enrichment region on the other hand, thus forming a unique microphase separation structure.

[0071] Mechanical properties of materials in Experiment Example 2

[0072] The mechanical properties of the gels from Examples 1-2 and Comparative Examples 1-2 of this invention were characterized using a universal testing machine (UTM-4103, China) at room temperature to test tensile properties. The hydrogels were cut into rectangular samples (50 mm × 10 mm × 2 mm) and measured at a strain rate of 10 mm / min. The sample length between the clamps was initially 30 mm. The tensile modulus of the hydrogel was calculated based on the slope of the stress-strain curve at 5%–15% strain; the area enclosed by the stress-strain curve represents the toughness of the hydrogel.

[0073] like Figure 3 As shown, stress diagrams of the gels from Examples 1-2 and Comparative Examples 1-3 of the present invention are presented, wherein PVA / PAM-NaIL 1 is the gel prepared in Example 1; PVA / PAM-NaIL 2 is the gel prepared in Example 2; PVA / PAM-IL is the gel prepared in Comparative Example 1; PVA / PAM-Na is the gel prepared in Comparative Example 2; and PVA / PAM-NaIL 3 is the gel prepared in Comparative Example 3. Figure 3 It can be seen that the PVA / PAM-NaIL 2 gel of Example 2 of the present invention has a tensile strength greater than 9 MPa when the elongation at break is approximately 430%. Furthermore, the elongation at break and toughness of Examples 1-2 are significantly higher than those of Comparative Examples 1-2. This is because in the microphase separation structure, the ionic liquid-rich region is highly solvated, with a large free volume, macroscopically exhibiting a three-dimensional network structure with elastic deformation capabilities; while the polymer chain-rich region, due to the presence of multiple hydrogen bonds, has a small free volume, macroscopically exhibiting a hard phase, which can serve as an energy-carrying unit, thus improving the mechanical properties of the ionic gel. Comparative Examples 1-2, which lack a microphase separation structure, lack effective energy-carrying units and have poor mechanical properties. Additionally, the excessive use of inorganic salts in Comparative Example 3 resulted in a decrease in both stress and strain.

[0074] like Figure 13 The diagrams shown depict the toughness and tensile strength of the gels from Examples 1-2 and Comparative Examples 1-3 of this invention. PVA / PAM-NaIL 1 is the gel prepared in Example 1; PVA / PAM-NaIL 2 is the gel prepared in Example 2; PVA / PAM-IL is the gel prepared in Comparative Example 1; PVA / PAM-Na is the gel prepared in Comparative Example 2; and PVA / PAM-NaIL 3 is the gel prepared in Comparative Example 3. Figure 13 It is known that the toughness and stress of ionogels increase with the increase of inorganic salts. However, excessive inorganic salts will decrease both the toughness and stress of ionogels.

[0075] like Figure 7The diagram shows the mechanical properties of Examples 1 and 3 of the present invention at low temperature (-20°C), where PVA / PAM-NaIL 1 is the gel prepared in Example 1; PVA / PAM-IL is the gel prepared in Comparative Example 1; and PVA / PAM-Na is the gel prepared in Comparative Example 2. Figure 7 It is known that the gel prepared in Example 1 of the present invention has a linear polymer as the main chain, namely PVA (polyvinyl alcohol), at low temperature (-20℃), and the resulting material has high strength and high toughness mechanical properties (elongation at break is about 340% and tensile strength is 7.5MPa), and becomes a stretchable material.

[0076] Phosphorescence lifetime of the material in Experiment Example 3

[0077] The phosphorescence lifetime of the gels in Examples 1-2 and Comparative Examples 1-2 of this invention was characterized by measuring the excitation wavelength of 365 nm using an FLS-980 photoluminescence spectrometer (Edinburgh Instruments, UK).

[0078] like Figure 1 The image shown is a phosphorescence pattern of Embodiment 1 of the present invention under tensile conditions. Figure 1 It can be seen that the ionogel exhibits obvious blue phosphorescence after being irradiated with a 365nm ultraviolet lamp under stretching conditions.

[0079] like Figure 4 The figures show phosphorescence lifetime diagrams of the gels from Examples 1-2 and Comparative Examples 1-2 of the present invention, where PVA / PAM-NaIL 1 is the gel prepared in Example 1; and PVA / NPA-NaIL and PVA / PyBA-NaIL are the gels prepared in Example 3. Figure 4 It can be seen that the RTP lifetime of PVA / PAM-NaIL ion gel is significantly increased, with the most significant increase in PVA / PAM-NaIL 2, which has the longest lifetime of 112.4 milliseconds.

[0080] like Figure 5 The image shows full-color phosphorescence images of Embodiments 1 and 3 of the present invention. Figure 5 It can be seen that the phosphorescence lifetime of Examples 1-2 of the present invention is significantly higher than that of Comparative Examples 1-2. This is because in the microphase separation structure, the polymer chain enrichment region with highly aggregated molecular chains and obvious rigidity can generate aggregation-induced emission. At the same time, this rigid structure can effectively fix the triplet state of the luminescent group, thereby improving the phosphorescence lifetime.

[0081] like Figure 6 The image shown is a phosphorescence pattern of Embodiment 3 of the present invention under tensile conditions. Figure 6 It is known that PVA / NPA-NaIL and PVA / PyBA-NaIL ionogels can maintain bright, ultra-long-lasting room-temperature phosphorescence under different strain conditions.

[0082] As Figure 8 shown, phosphor images of the present application example 1 and example 3 before and after recovery, wherein PVA / NPA-NaIL and PVA / PyBA-NaIL are gels prepared in example 3, PVA / PAM-NaIL is a gel prepared in example 1; UV on is the ultraviolet lamp on, UV off is the ultraviolet lamp off. It can be seen from Figure 8 that PVA / PAM-NaIL, PVA / NPA-NaIL and PVA / PyBA-NaIL ion gels have good recyclability after hot pressing. After one cycle, the full-color afterglow can be easily identified by the naked eye.

[0083] Conductivity of materials in experimental example 4

[0084] The conductivity of the gels of the present application examples 1-2 and comparative examples 1-2 was tested, and the specific method was as follows: measured by an electrochemical workstation (CHI760E, China Chenhua) with an applied voltage of 1V and a frequency of 1kHz, the size of the rectangular hydrogel sample tested was 50mmx10mmx2mm. The conductivity (σ) was calculated by the following formula:

[0085]

[0086] wherein R is the measured resistance, L is the length, and A is the cross-sectional area of the hydrogel sample.

[0087] As Figure 12 shown, the conductivity diagram of the gels of the present application examples 1-2 and comparative examples 1-3, wherein PVA / PAM-NaIL 1 is a gel prepared in example 1; PVA / PAM-NaIL 2 is a gel prepared in example 2; PVA / PAM-IL is a gel prepared in comparative example 1; PVA / PAM-Na is a gel prepared in comparative example 2; PVA / PAM-NaIL 3 is a gel prepared in comparative example 3. It can be seen from Figure 12 that the ionic conductivity of the gel PVA / PAM-NaIL 2 prepared in the present application example 2 is 1.04S / m, which is higher than PVA / PAM-NaIL 1 and PVA / PAM-NaIL 3, and also has little difference with the conductivity of the gel PVA / PAM-IL of comparative example 1.

[0088] External stimulus response and application display of materials in experimental example 5

[0089] The gel of the present application example 1 was tested for external stimulus response at room temperature, and the specific method was as follows: the external electrical signal of the PVA-based ion gel under external stimulus was recorded by an electrochemical workstation (CHI760E, China Chenhua), the applied voltage was 1V, and the frequency was 1kHz. In order to continuously measure the resistance during stretching, the ion gel was fixed on a self-made stretching platform with electrical leads at both ends.

[0090] like Figure 9 As shown, the gel of Example 1 of this invention responds to external stimuli at room temperature. A represents the relative change in resistance (ΔR / R0) with increasing strain, observed through continuous cyclic stretching and release tests. The results show that the resistance of the PVA / PAM-NaIL ion gel can accurately and reversibly respond to various strains (10% to 100%); B shows the linear relationship between strain and electrical signal, with a correlation coefficient of 0.995; C shows a stable and reliable relative resistance change under 15 kPa compression; D shows the relative resistance change detected by the PVA / PAM-NaIL ion gel corresponding to different degrees of finger flexion (30°, 60°, and 90°); E shows the relative resistance change detected by the PVA / PAM-NaIL ion gel corresponding to wrist flexion; and F shows the relative resistance change detected by the PVA / PAM-NaIL ion gel corresponding to human walking. Figure 9 It can be seen that PVA / PAM-NaIL ion gel can obtain stable electrical signals under different deformation conditions, which indicates that ion gel has excellent reliability for use in intelligent mechanical conduction devices.

[0091] The application of the gels in Examples 4 and 5 of this invention is demonstrated. Specifically, stretchable PVA-based ionic gels with different phosphorescent colors are placed at the joints of the robotic hand. Different phosphorescent colors can provide additional positional information; for example, red represents the thumb area, green represents the index finger, and blue represents the middle finger. By recognizing the color images of the "finger" movements, preliminary gesture information of the robotic hand can be obtained.

[0092] like Figure 10 As shown in the diagram, the application of the gel in Embodiment 4 of the present invention is illustrated. A shows the phosphorescent deformation, electrical signal changes, and gesture changes when grasping a ball; B shows the phosphorescent deformation, electrical signal changes, and gesture changes when grasping paper; and C shows the phosphorescent deformation, electrical signal changes, and gesture changes when grasping a cylinder. Figure 10 It is known that the ultra-long afterglow and bright room-temperature phosphorescence color of ion gels are easily identifiable by the naked eye. Combined with electrical signals, users can more intuitively and accurately identify the body language information of soft robots.

[0093] The present invention uses a stretchable gel from Example 5 to create a keyboard.

[0094] like Figure 11 The image shown illustrates the application of the gel in Embodiment 5 of the present invention. Figure 11It is known that when the UV excitation stops, the keyboard switches to the encrypted mode and the specific information is encoded in different room temperature phosphor colors. The relative change in resistance when a key is pressed can be used as a transmission signal. Only the correct pressing of the keys marked with the "blue" phosphor letters will unlock the keyboard, as these keys will generate the necessary electrical signal. Otherwise, it will be considered a false touch and no information will be transmitted. The vowels A, E, I, O and U are displayed in "red" phosphor on the keyboard because they are very important when spelling a word. If an electrical signal is detected from these keys before the keyboard is unlocked, an alarm is triggered.

[0095] Although the present application has been described in detail by the foregoing preferred embodiments, it is to be understood that such foregoing description is to be considered as illustrative only of the principles of the application and not intended to limit the scope of the application. Various modifications and alterations to this application will become apparent to those skilled in the art, having the benefit of the above description. It is intended that all such modifications and alterations be considered as falling within the scope of the application, as defined by the appended claims.

Claims

1. A method for preparing an organic ionogel with high ionic conductivity, stretchability, and long phosphorescent lifetime based on an anion-induced phase separation strategy, characterized in that, The method comprises: (1) configuring a high-molecular ion solution containing hydroxyl groups, adding a luminescent group solution after the solution is clear, adding an inorganic salt and stirring until the solution is clear to obtain a precursor solution; The high-molecular ion solution containing hydroxyl groups contains polyvinyl alcohol as the high-molecular group containing hydroxyl groups; The ionic liquid in the high-molecular ion solution containing hydroxyl groups is 1-ethyl-3-methyl imidazolium chloride; The luminescent group is polyacrylamide; The inorganic salt is sodium chloride; The concentration of the inorganic salt is 0.1% to 2%, and the mass ratio of the ionic liquid, the luminescent group solution and the inorganic salt is (10 to 100):1:1; (2) obtaining an organic ion gel after the precursor solution is frozen and thawed and dried.

2. The production method according to claim 1, characterized by, The concentration of the high-molecular group containing hydroxyl groups in the high-molecular ion solution containing hydroxyl groups is 0.1% to 15%, and the mass ratio of the high-molecular group containing hydroxyl groups and the ionic liquid is 100:(1 to 99).

3. The production method according to claim 2, characterized by, The concentration of the luminescent group solution is 0.1% to 5%.

4. The method of claim 1, wherein, The mass ratio of the high-molecular group containing hydroxyl groups and the solvent in the high-molecular ion solution containing hydroxyl groups is (0.1 to 1):

10.

5. The preparation method according to claim 1, characterized in that, The freezing and thawing temperature is -30°C to 0°C; the drying temperature is 40°C to 80°C; and the drying time is 0.1h to 12h.

6. A stretchable phosphorescent material prepared by the preparation method of any one of claims 1 to 5.

7. The stretchable phosphorescent material of claim 6, wherein, The stretchable phosphorescent material has a microphase separation structure.

8. Use of the stretchable phosphorescent material of claim 6 in the preparation of electronic skin, anti-counterfeiting patterns and stress-strain sensors.

9. Use according to claim 8, characterized in that, The use includes wearable electronic devices.

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