A self-activated multi-mode response stress luminescence material, a preparation method and application thereof

Abstract

This invention provides a self-excited multimode responsive stress-luminescent material, its preparation method, and its applications. The chemical formula of this material is: Sr 1‑x‑y ZnOS:xPr 3+ ,ySm 3+ Where x and y are Pr 3+ and Sm 3+ The molar percentage content is 0 ≤ x ≤ 0.02, 0 ≤ y ≤ 0.03, and x and y are not simultaneously zero. This invention prepares the material using a high-temperature solid-state method, achieving Pr in a SrZnOS matrix. 3+ / Sm 3+ Co-doping with two rare-earth ions endows the material with simultaneous responsiveness to force, heat, and light stimuli, without requiring pre-charging from an external light source. This material combines stress distribution imaging and temperature sensing capabilities, achieving multi-dimensional response and visualization of luminescent signals, significantly enhancing its information carrying capacity. It holds broad application prospects in fields such as intelligent sensing, advanced anti-counterfeiting, and industrial monitoring.

Description

Technical Field

[0001] This invention belongs to the field of inorganic luminescent materials technology, specifically relating to a self-excited multimode responsive stress luminescent material, its preparation method, and its application. Background Technology

[0002] Stress-luminescent materials are a unique class of functional materials capable of converting mechanical energy (such as impact, friction, bending, stretching, or compression) into photon emission. The earliest record of mechanoluminescence dates back to 1605, when Francis Bacon described the light emission caused by scratching or breaking hard candy in his book "The Advancement of Learning." Due to their unique force-to-light conversion properties, these materials can achieve self-excited sensing without an external power source, offering broad application prospects in fields such as information security, artificial skin, structural health monitoring, and biomedicine.

[0003] However, traditional luminescent materials typically emit light in a fixed wavelength range under a single excitation mode. This "one-excitation-one-emission" emission mode results in low signal identifiable dimensions, severely limiting their in-depth application in fields such as information anti-counterfeiting and complex environment sensing. With the increasing demands for integrated material functions in optoelectronic technology, there is an urgent need to develop novel luminescent material systems that integrate multiple response mechanisms. By achieving differentiated output of emission colors under multi-dimensional excitation, the information carrying capacity of materials can be significantly enhanced, opening up new avenues for their application in intelligent sensing and high-end anti-counterfeiting.

[0004] Therefore, multimodal stress-luminescent materials capable of responding to multiple external stimuli (such as force, heat, and light) simultaneously have become a research hotspot. The core advantage of such materials lies in their multidimensional tunability and environmental responsiveness in luminescence performance. By introducing multiple luminescent centers, the material can effectively control the luminescence color and intensity under mechanical stress, and this luminescence behavior can be further modulated by other external conditions. For example, Chen et al. developed the SrZnOS:Tb,Eu system and achieved stress-luminescence temperature imaging without external light source excitation (see: Chen C, Zhuang Y, Li X, et al. Achieving remote stress and temperature dual‐modal imaging by double‐lanthanide‐activated mechanoluminescent materials[J]. Advanced Functional Materials, 2021, 31(25): 2101567.); Jiang et al. reported SrF2:Eu 2+ ,Sm3+ The system utilizes Eu 2+ (Blue light) and Sm 3+ The intensity ratio of (red light) enables synchronous decoupled sensing of stress and temperature (see: Jiang Y, Fang S, Lang T, et al. Breaking the Cross‐Sensitivity Limit: Simultaneous Stress and Temperature Dual‐Mode Sensing Via Colorimetric Mechanoluminescence in SrF2:Eu). 2+ ,Sm 3+ [J]. Laser & Photonics Reviews, 2026, 20(1): e01643.).

[0005] Despite some progress in the research of multimode responsive stress-luminescent materials, the following technical bottlenecks remain: narrow operating temperature range, relatively low sensitivity, and limited visualization applications. Regarding the SrZnOS matrix, existing research mainly focuses on single rare-earth ion doping. For example, Li et al. reported Pr... 3+ Stress luminescence properties of single-doped SrZnOS (Li T, Yang Yunling, Fan Yuting, et al. By Pr 3+ Stress-induced color modulation of SrZnOS and its stress-induced luminescence mechanism [J]. Journal of Luminescence, 2021, 42(6): 818-828.); luminescence properties can be modulated by co-doping with alkaline earth metal ions (see: Jia J, Wang D, Gao X, et al. Alkaline-earth-metal-ion blending enhanced mechanoluminescence of lanthanide ions in MZnOS hosts for stress sensing and anticounterfeiting [J]. Journal of Materials Chemistry C, 2023, 11(13): 4351-4356.). However, none of the above studies have involved Pr 3+ / Sm 3+ The technical solution of achieving multi-mode response of force, heat and light through dual rare earth co-doping, and the development of multi-mode responsive stress luminescent materials with high sensitivity, wide temperature range response and visualization function based on SrZnOS matrix, have not yet been systematically reported.

[0006] Therefore, developing a novel dual-rare-earth-doped SrZnOS stress-luminescent material to achieve dual functions of self-excited stress distribution imaging and visualized temperature sensing is of great significance for promoting the application of stress-luminescent materials in fields such as intelligent sensing, anti-counterfeiting authentication, and industrial monitoring. This application introduces Pr into the SrZnOS matrix simultaneously... 3+ and Sm 3+ This study demonstrates that materials can respond synergistically to a variety of physical stimuli, exhibiting significant and substantial characteristics and advancements, and possessing good industrial applicability and broad application prospects. Summary of the Invention

[0007] To address the technical bottlenecks in existing stress-luminescent materials, such as their inability to simultaneously respond to multiple external stimuli (force, heat, and light), narrow operating temperature range, low relative sensitivity, and limited visualization applications, this invention provides a self-excited multimode responsive stress-luminescent material, its preparation method, and its applications. The aim is to achieve the integration of stress distribution imaging and visualized temperature sensing functions without the need for external light source pre-charging.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A self-excited multimode responsive stress-luminescent material with the general chemical formula: Sr 1-x-y ZnOS:xPr 3+ ,ySm 3+ Where x is Pr 3+ The molar percentage content, y is Sm 3+ The molar percentage content, and 0≤x≤0.02, 0≤y≤0.03, where x and y are not both zero.

[0010] The "multimodal response type" mentioned in this invention refers to the stress-luminescent material being able to respond simultaneously to three external stimuli: force, heat, and light; the "self-excitation" refers to the stress-luminescent material being able to emit light directly under mechanical stress without the need for pre-charging by an external light source.

[0011] The self-excited multimode responsive stress-luminescent material disclosed in this invention is prepared by a high-temperature solid-state method, including the following steps:

[0012] When the material is a single-doped material (i.e., one of x and y is zero):

[0013] S1: Weigh out the strontium-containing compound, zinc-containing compound, sulfur-containing compound, praseodymium source or samarium source and flux according to the element stoichiometric ratio, grind them thoroughly, add an appropriate amount of deionized water or anhydrous ethanol, place the mixture on a magnetic stirrer and stir thoroughly, and dry to obtain mixed powder;

[0014] S2: Place the obtained mixed powder in an inert atmosphere and calcine it at a temperature of not less than 1000 ℃ for 6 to 8 hours;

[0015] S3: Grind the calcined product to obtain the self-excited multimode responsive stress luminescent material.

[0016] When the material is a co-doped material (i.e., neither x nor y is zero):

[0017] After completing steps S1 and S2 above, the calcined product is ground and placed again in an inert atmosphere for secondary calcination at a temperature not lower than 1000℃ for 6-8 hours to reduce impurity phases in the sample. The product after secondary calcination is ground to obtain the self-excited multimode responsive stress luminescent material.

[0018] In step S1, the strontium-containing compound is preferably at least one of strontium carbonate, strontium oxide, and strontium nitrate; the zinc-containing compound and the sulfur-containing compound are preferably zinc sulfide; the praseodymium source is preferably at least one of praseodymium oxide and praseodymium chloride; the samarium source is preferably at least one of samarium oxide and samarium chloride; the flux is preferably lithium carbonate, and the molar ratio of lithium carbonate to zinc sulfide is 0.01:1. In step S2, the inert atmosphere is preferably at least one of nitrogen and argon.

[0019] The present invention also provides a stress-emitting film comprising the above-mentioned self-excited multimode responsive stress-emitting material and a polymer matrix material. The polymer matrix material is epoxy resin or polydimethylsiloxane (PDMS). When epoxy resin is used, the mass ratio of the stress-emitting material to epoxy resin is 1:(0.5~8); when PDMS is used, the mass ratio of the stress-emitting material to PDMS is 1:(0.5~5).

[0020] The present invention also provides a stress sensor, comprising the above-mentioned PDMS stress luminescent film and two polyethylene terephthalate (PET) films, wherein the stress luminescent film is encapsulated between the two PET films to form a sandwich structure.

[0021] The present invention also provides a temperature sensor comprising the aforementioned PDMS stress-emitting film, wherein the stress-emitting film has a dumbbell-shaped structure, and the temperature sensor has a temperature measurement range of 298 ~ 498 K and a relative sensitivity of 0.847% K. -1 .

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) This invention implements Pr in a SrZnOS matrix. 3+ / Sm 3+By co-doping with two rare earth ions and adjusting the doping ratio, the stress emission color of the material at room temperature can be continuously changed from green to red, achieving multi-dimensional tunability of the emission color.

[0024] (2) The material of the present invention can respond to three external stimuli at the same time: force, heat and light, and does not require pre-charging of external light source, thus overcoming the defects of traditional stress luminescent materials that have single function and rely on external excitation.

[0025] (3) This material possesses dual functions of stress distribution imaging and temperature sensing. The stress sensor fabricated from it can achieve advanced authentication by recording the pressure distribution during writing; the temperature sensor fabricated from it achieves a maximum relative sensitivity of 0.847% K over a wide temperature range of 298–498 K. -1 It is superior to most existing stress-luminescent temperature sensing materials.

[0026] (4) This material can achieve quantitative temperature detection (by recording the luminescence intensity ratio I). R It can also obtain real-time temperature by using a fitting function, and can also realize semi-quantitative visual temperature detection (by using the characteristic that the color of stress emission changes from green to orange-red as the temperature rises, the temperature range can be directly judged by the naked eye), meeting the needs of rapid on-site detection and low-cost application.

[0027] (5) The high-temperature solid-state method is adopted, the process conditions are controllable, the equipment requirements are low, the cost is low, and the resulting material has high purity and good crystallinity, making it easy to mass-produce. Attached Figure Description

[0028] Figure 1 (a) XRD patterns of samples from Examples 1 to 8; Figure 1 (b) is the SEM image of the sample in Example 8.

[0029] Figure 2 (a) is the normalized emission spectrum (λ) of the sample in Example 8. ex =292 nm, λ ex =407 nm). Figure 2 (b) shows the CIE color coordinate diagrams of the sample in Example 8 under excitation at 292 nm and 407 nm. The inset shows the photographs of the sample under each of the two excitations.

[0030] Figure 3 This is a schematic diagram of a homemade device used to study the relationship between stress emission spectra and load force.

[0031] Figure 4 (a) Normalized stress emission spectra of samples in Examples 1, 2, 4, 5, 6, and 8 under a load of 100 N. The inset shows photographs of the corresponding epoxy resin films being scraped with tweezers. Figure 4(b) is the CIE color coordinate diagram corresponding to the stress emission of samples in Examples 1, 2, 4, 5, 6, and 8.

[0032] Figure 5 This is a schematic diagram of a stress emission spectroscopy measurement system at different operating temperatures.

[0033] Figure 6 (a) is the stress emission spectrum of the sample in Example 4 at different temperatures from 298 to 523 K. All stress emission spectra are normalized to the intensity at 520 nm. Figure 6 (b) is the stress luminescence intensity ratio I of the sample in Example 4. R (I) 652 / I 520 The curve of stress luminescence as a function of operating temperature (T) is shown in the figure, and the illustration shows the CIE color coordinate diagram of stress luminescence at different temperatures. Figure 6 (c) represents the absolute sensitivity (S) of the sample temperature sensing in Example 4. A ) and relative sensitivity (S R The curve showing the change of temperature; Figure 6 (d) The stress luminescence intensity ratio of the sample in Example 4 to I during five heating-cooling cycles. R The stability test results are shown in the figure.

[0034] Figure 7 This is a flow chart of the PDMS membrane preparation process.

[0035] Figure 8 (a) is a photograph of the stress sensor recorded by handwriting in a darkroom and the corresponding stress distribution diagram. The inset on the right is a photograph of the stress sensor under white light. Figure 8 (b) Photographs of the PDMS film of the sample in Example 4 being scratched at different temperatures. Detailed Implementation

[0036] All raw materials used in this invention can be purchased through commercial channels or prepared according to conventional methods known to those skilled in the art, and their sources are not particularly limited.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.98 ZnOS:0.02Pr 3+ The high-temperature solid-state method was used for preparation, and the specific steps are as follows:

[0040] S1: Weigh out 4.3403 g of strontium carbonate (SrCO3), 2.9238 g of zinc sulfide (ZnS), and 0.1021 g of praseodymium oxide (Pr6O3). 11 0.0222 g of lithium carbonate (Li2CO3). The weighed raw materials were ground in an agate mortar for 5 to 10 minutes. After grinding, anhydrous ethanol was added, and the mixture was stirred on a magnetic stirrer for 5 to 10 minutes. The stirred raw materials were then dried in an oven and transferred to a corundum crucible.

[0041] S2: Place the corundum crucible in a high-temperature tube furnace, introduce argon gas as a protective atmosphere, heat to 1050 ℃ at a heating rate of 8 ℃ / min, and calcine at this temperature for 6 h. After naturally cooling to room temperature, thoroughly grind the sintered product to obtain the self-excited multimode responsive stress luminescent material.

[0042] The preparation method of epoxy resin stress luminescent film is as follows: Weigh 1.8 g of epoxy resin A, 0.6 g of epoxy resin B, and 0.48 g of the above-mentioned self-excited multimode responsive stress luminescent material, and mix them evenly in a container. Pour the mixed slurry into a cylindrical polyethylene mold (30 mm in diameter and 5 mm in height), and allow it to dry and cure naturally to obtain epoxy resin stress luminescent film.

[0043] Example 2

[0044] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.97 ZnOS: 0.03Sm 3+ The preparation method is basically the same as in Example 1, except that 4.2960 g of strontium carbonate is weighed and praseodymium oxide is replaced with 0.1569 g of samarium oxide (Sm2O3). The remaining steps are the same as in Example 1.

[0045] Example 3

[0046] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.979 ZnOS: 0.02Pr 3+ 0.001Sm 3+ The preparation method employs a two-stage calcination process, with the specific steps as follows:

[0047] S1: Weigh out 4.3359 g of strontium carbonate, 2.9238 g of zinc sulfide, 0.1021 g of praseodymium oxide, 0.0052 g of samarium oxide, and 0.0222 g of lithium carbonate. Grind the weighed raw materials in an agate mortar for 5-10 min, add anhydrous ethanol, stir magnetically for 5-10 min, dry, and then transfer to a corundum crucible.

[0048] S2: Place the corundum crucible in a high-temperature tube furnace, introduce argon gas, heat to 1000℃ at a heating rate of 8℃ / min, and hold for calcination for 6 hours. After naturally cooling to room temperature, grind the sintered product and transfer it back to the corundum crucible.

[0049] S3: The corundum crucible was placed again in a high-temperature tube furnace and calcined a second time under the same conditions (argon atmosphere, 1000 ℃ for 6 h). After naturally cooling to room temperature, the product was thoroughly ground to obtain the self-excited multimode responsive stress luminescent material.

[0050] Example 4

[0051] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.977 ZnOS: 0.02Pr 3+ 0.003Sm 3+ The preparation method is basically the same as in Example 3, except that 4.3270 g of strontium carbonate and 0.0157 g of samarium oxide are weighed, and the rest of the steps are the same as in Example 3.

[0052] The preparation method of PDMS stress-luminescent film is as follows: Weigh 0.8 g of PDMS base component, 0.08 g of curing agent, and 0.88 g of the above-mentioned self-excited multimode responsive stress-luminescent material, and mix them evenly in a container. Pour the mixed slurry into a mold, place it in a vacuum oven, first evacuate the vacuum for 5 to 10 minutes to remove air bubbles, and then dry it at 80 ℃ for 1 hour to obtain PDMS stress-luminescent film.

[0053] Example 5

[0054] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.975 ZnOS: 0.02Pr 3+ 0.005Sm 3+ The preparation method is basically the same as in Example 3, except that 4.3182 g of strontium carbonate and 0.0262 g of samarium oxide are weighed, and the rest of the steps are the same as in Example 3.

[0055] Example 6

[0056] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.9725ZnOS: 0.02Pr 3+ 0.0075Sm 3+ The preparation method is basically the same as in Example 3, except that 4.3071 g of strontium carbonate and 0.0392 g of samarium oxide are weighed, and the rest of the steps are the same as in Example 3.

[0057] Example 7

[0058] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.965 ZnOS: 0.02Pr 3+ 0.015Sm 3+ The preparation method is basically the same as in Example 3, except that 4.2739 g of strontium carbonate and 0.0785 g of samarium oxide are weighed, and the rest of the steps are the same as in Example 3.

[0059] Example 8

[0060] A self-excited multimode responsive stress-luminescent material with the chemical formula Sr 0.96 ZnOS: 0.02Pr 3+ 0.02Sm 3 + The preparation method differs from Example 3 only in that 4.2517 g of strontium carbonate and 0.1046 g of samarium oxide are weighed; the rest is the same as in Example 3.

[0061] Figure 1 (a) shows the XRD patterns of the samples in Examples 1 to 8. All diffraction peaks are highly consistent with the standard card (ICSD#431819) of SrZnOS. Only trace amounts of SrS impurity phase are present. No other secondary phases or amorphous phases are clearly observed, indicating that the samples have high purity and good crystallinity. Figure 1 (b) is a SEM image of the sample in Example 8, showing that its morphology is fragmented and the particle size is mainly distributed between 10 and 40 μm.

[0062] Figure 2 The normalized emission spectrum (λ) of the sample in Example 8 ex =292 nm, λ ex =407 nm). Figure 2 (b) shows the CIE color coordinates of the sample in Example 8 under excitation at 292 nm and 407 nm. The inset shows photographs of the sample under each of the two excitations. It can be seen that the emission color of the sample differs significantly under different excitation wavelengths, thus confirming that the co-doped SrZnOS possesses dual-mode photoluminescence characteristics.

[0063] Figure 3This is a schematic diagram of a self-made device used to study the relationship between stress emission spectra and load force. The device consists of a rotating motor, a loading unit, a fiber optic spectrometer, and a data acquisition terminal.

[0064] Figure 4 (a) Normalized stress emission spectra of samples in Examples 1, 2, 4, 5, 6, and 8 under a load of 100 N. The inset shows photographs of the corresponding epoxy resin films being scraped with tweezers. Figure 4 (b) CIE chromaticity coordinate diagrams corresponding to the stress emission of samples in Examples 1, 2, 4, 5, 6, and 8. By adjusting Pr... 3+ / Sm 3+ The doping ratio can be adjusted to achieve a continuous change in stress-emitting color from green and yellow to orange and red at room temperature.

[0065] Figure 5 This is a schematic diagram of a stress emission spectroscopy measurement system at different operating temperatures. The system consists of a heating module, a fiber optic spectrometer, and a data acquisition terminal.

[0066] Figure 6 (a) shows the stress emission spectra of the sample in Example 4 at different temperatures from 298 to 523 K. All stress emission spectra were normalized to the intensity at 520 nm. Figure 6 (b) is the stress luminescence intensity ratio I of the sample in Example 4. R (I) 652 / I 520 The curve showing the change of temperature with operating temperature (T), and the corresponding fitting formula: Where ΔE is the energy difference between the two thermally coupled energy levels, k B is the Boltzmann constant, T represents the operating temperature, and A and C are fitting constants. Figure 6 (b) The illustration shows the CIE color coordinate diagram of stress emission of the sample in Example 4 at different temperatures, which shows that the stress emission color of the sample can change continuously from green to orange-red as the temperature increases.

[0067] Figure 6 (c) represents the absolute sensitivity (S) of the sample temperature sensing in Example 4. A ) and relative sensitivity (S R The curve shows the change in temperature over time. From the graph, we can see that the maximum relative sensitivity of the sample is 0.847% K. -1 ; Figure 6 (d) The stress luminescence intensity ratio of the sample in Example 4 to I during five heating-cooling cycles. R The stability test results show that the sample has good stability.

[0068] Figure 7This is a flow chart of the PDMS membrane preparation process, which mainly consists of three steps: mixing, molding, and drying.

[0069] Figure 8 (a) is a photograph of the stress sensor recorded by handwriting in a darkroom and the corresponding stress distribution diagram. The inset on the right is a photograph of the stress sensor under white light. Figure 8 (b) Photographs of the PDMS film of the sample in Example 4 being scratched at different temperatures. Figure 8 (a) and Figure 8 (b) shows the use of the sample in stress sensors and temperature sensors, respectively.

Claims

1. A self-excited multimode responsive stress-luminescent material, characterized in that, The chemical formula of the self-excited multimodal responsive stress-luminescent material is Sr. 1-x-y ZnOS:xPr 3+ ,ySm 3+ Where x is Pr 3+ The molar percentage content, y is Sm 3+ The molar percentage content is such that 0≤x≤0.02, 0≤y≤0.03, and x and y are not both zero.

2. The self-excited multimode responsive stress-luminescent material according to claim 1, characterized in that, The self-excited multimode responsive stress-luminescent material can respond simultaneously to three external stimuli: force, heat, and light, without requiring pre-charging from an external light source.

3. The self-excited multimode responsive stress-luminescent material according to claim 1, characterized in that, When the self-excited multimode responsive stress-luminescent material is a single-doped material, one of x and y is zero; when the self-excited multimode responsive stress-luminescent material is a co-doped material, neither x nor y is zero.

4. A method for preparing a self-excited multimode responsive stress-luminescent material according to any one of claims 1 to 3, characterized in that, Includes the following steps: S1: Weigh out the strontium-containing compound, zinc-containing compound, sulfur-containing compound, praseodymium source, samarium source and flux according to the element stoichiometric ratio, grind them thoroughly and add an appropriate amount of deionized water or anhydrous ethanol. Place the mixture on a magnetic stirrer and stir thoroughly. Dry to obtain mixed powder. S2: Place the obtained mixed powder in an inert atmosphere and calcine it at a temperature of not less than 1000 °C for 6 to 8 hours; When the self-excited multimode responsive stress luminescent material is a single-doped material, the calcined product is ground to obtain the self-excited multimode responsive stress luminescent material. When the self-excited multimode responsive stress luminescent material is a co-doped material, the calcined product is ground and then placed in an inert atmosphere again for calcination at a temperature not lower than 1000 °C for 6 to 8 hours. The product after the second calcination is then ground to obtain the self-excited multimode responsive stress luminescent material.

5. The preparation method according to claim 4, characterized in that, The strontium-containing compound is selected from at least one of strontium carbonate, strontium oxide, and strontium nitrate; the zinc-containing compound and the sulfur-containing compound are zinc sulfide; the praseodymium source is selected from at least one of praseodymium oxide and praseodymium chloride; the samarium source is selected from at least one of samarium oxide and samarium chloride; the flux is lithium carbonate, and the molar ratio of lithium carbonate to zinc sulfide is 0.01:

1.

6. A stress-emitting film, characterized in that, The stress-emitting film comprises the self-excited multimode responsive stress-emitting material as described in any one of claims 1 to 3, and a polymer matrix material.

7. The stress-emitting film according to claim 6, characterized in that, The polymer matrix material is epoxy resin, and the mass ratio of the self-excited multimode responsive stress luminescent material to the epoxy resin adhesive is 1:(0.5~8).

8. The stress-emitting film according to claim 6, characterized in that, The polymer matrix material is polydimethylsiloxane, and the mass ratio of the self-excited multimode responsive stress luminescent material to polydimethylsiloxane is 1:(0.5~5).

9. A stress sensor, characterized in that, The stress sensor includes the stress-emitting film as described in claim 8, and two polyethylene terephthalate films, wherein the stress-emitting film is encapsulated between the two polyethylene terephthalate films to form a sandwich structure.

10. A temperature sensor, characterized in that, The temperature sensor includes the stress-emitting film as described in claim 8, the stress-emitting film having a dumbbell-shaped structure, and the temperature sensor having a temperature measurement range of 298 ~ 498 K and a relative sensitivity of 0.847% K. -1 .

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