Composite matrix stress luminescent material and preparation method thereof

Abstract

The invention discloses a composite matrix stress luminescent material and a preparation method thereof, and particularly relates to the field of stress luminescent materials. The material is prepared from the following components in parts by weight: 30-40 parts of composite matrix stress luminescent powder, 10-15 parts of sodium alginate, 2-5 parts of ZnCl2 and 40-55 parts of polydimethylsiloxane prepolymer, and a dual self-recovery structure is formed by adopting the coordination effect of carboxyl of the sodium alginate and Zn < 2 + > and a dynamic hydrogen bond network, so that the composite matrix has excellent flexibility and environment resistance. The stress luminescent powder is prepared through ball-milling mixing and high-temperature solid-phase sintering of the precursor oxide; mixing the powder with sodium alginate, ZnCl2 and a polydimethylsiloxane prepolymer, performing ultrasonic dispersion, vacuum defoaming and curing at 85 DEG C to crosslink a network structure to obtain the composite matrix stress luminescent material, and the obtained material has the advantages of high sensitivity, flexibility, bendability, strong adaptive capacity to environment and the like.

Description

Technical Field

[0001] This invention relates to the field of stress-luminescent materials, and particularly to a composite matrix stress-luminescent material and its preparation method. Background Technology

[0002] Stress-luminescent materials are a class of intelligent materials capable of directly converting mechanical energy into light energy. They enable the visual detection of stress, strain, and mechanical damage without the need for an external power source. With the rapid development of flexible electronics, smart wearable devices, and human-computer interaction systems, flexible stress-luminescent sensors that can adapt to large deformations, possess high sensitivity, and exhibit good biocompatibility have become a research hotspot. These materials show great application potential in fields such as electronic skin, structural health monitoring, biomechanical measurement, and robotic tactile perception. In particular, flexible composite materials based on elastic matrices such as polydimethylsiloxane have attracted considerable attention due to their excellent transparency and ductility.

[0003] Existing flexible stress-luminescent composite materials still face numerous technical bottlenecks in practical applications. First, there is a natural difference in interfacial compatibility between inorganic luminescent powders and organic polymer matrices such as polydimethylsiloxane. Inorganic powders are typically hydrophilic, while polydimethylsiloxane is hydrophobic. Simple physical blending often results in uneven filler dispersion and weak interfacial bonding, making them prone to interfacial delamination or microcracks during long-term cyclic stress, leading to decreased luminescent performance and reduced mechanical strength. Second, traditional polydimethylsiloxane stress-luminescent materials lack self-healing capabilities and sufficient toughness. Once the material is scratched by a sharp object or suffers internal damage due to excessive stretching during service, its sensing function will be irreversibly lost, significantly limiting the device's lifespan and reliability.

[0004] Patent CN112175604B relates to a multi-layered coated composite powder. The core consists of a microsphere matrix, quantum dot material, and a coating layer. The quantum dot material is adsorbed within the microsphere matrix to form the basic structure, and the exterior is coated with at least one organic polymer layer, or a combination of organic polymer and inorganic oxide layers. The preparation process mainly involves mixing and heating the quantum dot material with the microsphere matrix to form a composite matrix, followed by mixing, reaction, separation, and drying with polymer colloids or monomers to complete the multi-layer coating. This composite powder retains the high luminescence efficiency of quantum dots, exhibits excellent weather resistance, and demonstrates good stability, especially in harsh environments, making it a superior fluorescent conversion material.

[0005] Patent CN117106445A discloses a mechanoluminescent elastic composite material, consisting of an organic polymer elastic carrier and mechanoluminescent powder incorporated therein. The mechanoluminescent powder is halloysite nanotube-doped ZnS:Mn powder. During preparation, ZnS, halloysite nanotubes, a manganese source, elemental sulfur, and a flux are mixed and sintered under a protective atmosphere to obtain the mechanoluminescent powder. This powder is then mixed with a prepolymer of the organic polymer elastic carrier and a curing agent, and heated to cure, yielding the finished product. Through HNT doping, more electrons can be injected under stress-induced light to enhance luminescence intensity, and the elastic modulus of the carrier can be increased to optimize stress transmission, effectively solving the problem of low luminescence brightness in traditional ZnS-based mechanoluminescent materials within an elastic matrix.

[0006] Patent CN111548791A discloses a light-emitting film comprising a substrate and a calcium carbonate nanocomposite material layer attached to the substrate, with some portions also including a conductive cathode. The composite material layer uses specific calcium carbonate as a matrix and cerium as a dopant, with cerium serving as the primary light-emitting center in a specific ionic form. The preparation method involves first mixing calcium carbonate and cerium oxide powder in a specific ratio and sintering at high temperature to form a target material. Then, the target material and the treated substrate are placed in the cavity of a coating equipment. After vacuum treatment, the target material is excited by a laser, causing the material to deposit onto the substrate to form a nanocomposite material layer. If necessary, subsequent processing forms a conductive cathode. This light-emitting film uses environmentally friendly, renewable, and readily available raw materials. The nanoarray structure improves the luminous efficiency, making it suitable for semiconductor optoelectronic fields.

[0007] Environmental stability is another major challenge restricting the application of existing materials. Many traditional stress-luminescent materials or matrix materials are prone to hydrolysis or performance degradation in humid environments, resulting in drastic fluctuations in luminescence intensity under different humidity conditions. This severely affects the testing accuracy of sensors in complex environments such as high-humidity sweat environments or variable outdoor climates. Although there is research on endowing materials with self-healing properties by introducing dynamic bonds such as hydrogen bonds and coordination bonds, it is often difficult to balance the material's mechanical strength, environmental stability, and luminescence efficiency. How to achieve rapid self-healing, high toughness, and performance stability over a wide humidity range while maintaining high stress luminescence response is a key problem that needs to be solved in the field of flexible stress-luminescent materials.

[0008] To address the issues of insufficient performance of luminescent powder, unreasonable composite matrix structure, and poor powder dispersibility in stress-luminescent materials, this invention proposes a composite matrix stress-luminescent material and its preparation method. Summary of the Invention

[0009] The main objective of this invention is to provide a composite matrix stress-luminescent material and its preparation method, which can effectively solve the problems of insufficient luminescence efficiency, poor structural mechanical properties, and weak interfacial bonding between powder and elastomer.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A composite matrix stress luminescent material comprises the following components by weight: 30-40 parts of composite matrix stress luminescent powder, 10-15 parts of sodium alginate, 2-5 parts of ZnCl2, and 40-55 parts of polydimethylsiloxane prepolymer. Preferably, the chemical formula of the composite matrix stress-luminescent powder is: (Sc 1-x Zn x )BO3:Cr m ,Yb n ,Sm p , where 0.10≤x≤0.25, 0.015≤m≤0.030, 0.005≤n≤0.015, and 0.005≤p≤0.012.

[0011] A method for preparing composite matrix stress-luminescent materials includes the following steps: S1: Sc2O3, ZnO, H3BO3, Cr2O3, Yb2O3 and Sm2O3 were weighed according to the stoichiometric ratio, and the composite matrix stress luminescent powder was obtained by wet ball milling and sintering. S2: Mix the composite matrix stress luminescent powder, sodium alginate, ZnCl2 and polydimethylsiloxane prepolymer in the specified amounts, add anhydrous ethanol and ultrasonically disperse for 30 minutes, vacuum degas for 20-30 minutes, and then cure at 80-90℃ for 3 hours to obtain the composite matrix stress luminescent material.

[0012] Preferably, the composite matrix stress luminescent powder is prepared by subjecting Sc2O3, ZnO, H3BO3, Cr2O3, Yb2O3, and Sm2O3 to a high-temperature solid-state reaction under an argon atmosphere, with a sintering temperature of 1300~1400℃ and a holding time of 4~6 hours, followed by ball milling to control the powder particle size to 1~5μm.

[0013] Preferably, in step S1, the coordination ratio of Zn ions in ZnO to sodium alginate carboxyl groups is 1.2:1.

[0014] Preferably, the composite matrix stress luminescent material has a thickness of 80~120μm, a bendable radius of curvature ≤2mm, maintains stable luminescent performance at 20~98% relative humidity, and has environmental performance fluctuations ≤3%.

[0015] Preferably, the composite matrix stress-luminescent material can be used in flexible electronic skin, pressure sensors, tactile recognition devices, and tactile units of health monitoring patch robots.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes sodium alginate and Zn2+ The coordination structure and dynamic hydrogen bond system form a stable dual network structure in the hydrophobic matrix of polydimethylsiloxane, which enables the inorganic stress luminescent powder to be uniformly dispersed and enhances the interfacial bonding force with the organic matrix. This avoids problems such as agglomeration and interfacial delamination caused by traditional physical blending, and improves the reliability of the material during cyclic loading.

[0017] 2. The specific doping ratio of (Sc) in this invention 1-x Zn x )BO3:Cr m ,Yb n ,Sm p The borate system provides strong luminescence efficiency, and the powder particle size is controlled within 1~5μm, which is beneficial to stress transmission. The material can produce strong luminescence under small loads, which meets the requirements of flexible sensors for low stress response.

[0018] 3. This invention uses conventional wet ball milling and high-temperature solid-state method to prepare powder, and uses ultrasonic dispersion and low-temperature curing process to obtain composite material. The process flow is short, highly controllable, and suitable for industrial preparation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process for preparing the composite matrix stress-luminescent material according to the present invention; Detailed Implementation

[0020] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0021] The purpose of this invention is to provide a composite matrix stress-luminescent material, which is achieved by introducing borate-based luminescent powders with specific components and combining them with sodium alginate / Zn. 2+ The dual network structure constructed from polydimethylsiloxane significantly improves the material's moisture resistance, flexibility, and mechanical self-healing properties.

[0022] To achieve the above objectives, the present invention adopts the following technical solution, the specific process of which is as follows: Figure 1 As shown: A composite matrix stress luminescent material, by weight, comprises the following components: 30-40 parts of composite matrix stress luminescent powder, 10-15 parts of sodium alginate, 2-5 parts of ZnCl2, and 40-55 parts of polydimethylsiloxane prepolymer.

[0023] The general chemical formula of the composite matrix stress-luminescent powder is: (Sc 1-x Zn x )BO3:Cr m ,Yb n ,Sm p The specific doping ratio, where 0.10≤x≤0.25, 0.015≤m≤0.030, 0.005≤n≤0.015, and 0.005≤p≤0.012, gives the powder excellent stress luminescence response.

[0024] S1: First, the composite matrix stress-luminescent powder is prepared according to the general chemical formula: (Sc 0.8 Zn 0.2 )BO3:Cr 0.02 ,Yb 0.01 ,Sm 0.01 Accurately weigh the raw materials Sc2O3, ZnO, H3BO3, Cr2O3, Yb2O3, and Sm2O3 according to the stoichiometric ratio. Place the raw materials in a ball mill jar. The coordination ratio of Zn ions in ZnO to sodium alginate carboxyl groups is 1.2:1. Add an appropriate amount of ethanol and wet ball mill the mixture for 4 hours. After drying, place it in a crucible and put the crucible in a tube furnace. Probe the furnace with argon gas and heat it to 1300~1400℃ for 4~6 hours. After natural cooling, take out the sintered material, ball mill it again, and sieve it to obtain powder with a particle size distribution of 1~5μm for later use.

[0025] S2: Weigh 30-40 parts of the composite matrix stress luminescent powder prepared above, 10-15 parts of sodium alginate, 2-5 parts of ZnCl2, and 40-55 parts of polydimethylsiloxane prepolymer. Add the above components to 1.2 times the amount of anhydrous ethanol and disperse using an ultrasonic disperser for 30 minutes to ensure uniform mixing of the powder and components. Place the mixed slurry in a vacuum oven for degassing for 20-30 minutes to remove air bubbles. The coordination ratio of Zn ions to sodium alginate carboxyl groups in ZnO is 1.2:1.

[0026] Example 1 The specific steps for preparing composite matrix stress-luminescent materials are as follows: S1: Powder preparation: 85.7 parts Sc2O3, 10.7 parts ZnO, 40.7 parts H3BO3, 1.0 parts Cr2O3, 1.30 parts Yb2O3, and 1.15 parts Sm2O3 were weighed according to the stoichiometric ratio, mixed by wet ball milling, and the mixture was placed in a tube furnace for high-temperature solid-state reaction under an argon atmosphere. The sintering temperature was 1300℃ and the holding time was 4h. The sintered product was ball-milled to control the particle size to 1μm.

[0027] S2: Composite material molding: 30 parts of composite matrix stress luminescent powder, 10 parts of sodium alginate, 2 parts of ZnCl2 and 40 parts of polydimethylsiloxane prepolymer were mixed, anhydrous ethanol was added as solvent and ultrasonically dispersed for 25 minutes, followed by vacuum degassing for 20 minutes. Then it was cured at 80℃ for 3 hours.

[0028] The degassed slurry is coated onto a mold or substrate, with a thickness of approximately 100 μm. It is then placed in an oven and heat-cured at 80°C for 3 hours to obtain a composite matrix stress luminescent material.

[0029] Example 2 The specific steps for preparing composite matrix stress-luminescent materials are as follows: S1: First, the composite matrix stress-luminescent powder is prepared according to the general chemical formula: (Sc 0.8 Zn 0.2 )BO3:Cr 0.02 ,Yb 0.015 ,Sm 0.012 According to the stoichiometric ratio, accurately weigh 85.75 parts Sc2O3, 10.71 parts ZnO, 40.67 parts H3BO3, 1.00 parts Cr2O3, 1.94 parts Yb2O3, and 1.38 parts Sm2O3. Place the raw materials in a ball mill jar, add an appropriate amount of ethanol, and wet ball mill and mix for 4 hours. After drying, put them into a crucible, place the crucible in a tube furnace, introduce argon gas for protection, heat to 1400℃ and hold for 6 hours. After natural cooling, take out the sintered material, ball mill again and sieve to screen out powder with a particle size distribution of 1~5μm for later use.

[0030] S2: Weigh 40 parts of the composite matrix stress luminescent powder, 15 parts of sodium alginate, 5 parts of ZnCl2, and 55 parts of polydimethylsiloxane prepolymer prepared above. Add the above components to 1.2 times the amount of anhydrous ethanol of the raw materials and disperse them for 30 minutes using an ultrasonic disperser to ensure that the powder and each component are mixed evenly. Place the mixed slurry in a vacuum oven to degas for 30 minutes to remove air bubbles.

[0031] The degassed slurry is coated onto a mold or substrate, with a thickness of approximately 100 μm. It is then placed in an oven and heat-cured at 90°C for 3 hours to obtain a composite matrix stress luminescent material.

[0032] Example 3 The specific steps for preparing composite matrix stress-luminescent materials are as follows: S1: First, the composite matrix stress-luminescent powder is prepared according to the general chemical formula: (Sc 0.6 Zn 0.4 )BO3:Cr 0.02 ,Yb 0.01 ,Sm 0.01According to the stoichiometric ratio, accurately weigh 64.31 parts Sc2O3, 21.42 parts ZnO, 40.67 parts H3BO3, 1.00 parts Cr2O3, 1.30 parts Yb2O3, and 1.15 parts Sm2O3. Place the raw materials in a ball mill jar, add an appropriate amount of ethanol, and wet ball mill and mix for 4 hours. After drying, put them into a crucible, place the crucible in a tube furnace, introduce argon gas for protection, heat to 1350℃ and hold for 5 hours. After natural cooling, take out the sintered material, ball mill again and sieve it to screen out powder with a particle size distribution of 3μm for later use.

[0033] S2: Weigh 35 parts of the composite matrix stress luminescent powder, 12 parts of sodium alginate, 3 parts of ZnCl2, and 47 parts of polydimethylsiloxane prepolymer prepared above. Add the above components to 1.2 times the amount of anhydrous ethanol of the raw materials and disperse them for 30 minutes using an ultrasonic disperser to ensure that the powder and each component are mixed evenly. Place the mixed slurry in a vacuum oven to degas for 25 minutes to remove air bubbles.

[0034] The degassed slurry is coated onto a mold or substrate, with a thickness of approximately 100 μm. It is then placed in an oven and heat-cured at 85°C for 3 hours to obtain a composite matrix stress luminescent material.

[0035] Example 4 The specific steps for preparing composite matrix stress-luminescent materials are as follows: S1: First, the composite matrix stress-luminescent powder is prepared according to the general chemical formula: (Sc 0.8 Zn 0.2 )BO3:Cr 0.03 ,Yb 0.01 ,Sm 0.01 According to the stoichiometric ratio, accurately weigh 57.16 parts Sc2O3, 7.14 parts ZnO, 27.11 parts H3BO3, 1.00 parts Cr2O3, 0.86 parts Yb2O3, and 0.76 parts Sm2O3. Place the raw materials in a ball mill jar, add an appropriate amount of ethanol, and wet ball mill and mix for 4 hours. After drying, put them into a crucible, place the crucible in a tube furnace, introduce argon gas for protection, heat to 1320℃ and hold for 5 hours. After natural cooling, take out the sintered material, ball mill again and sieve it to screen out powder with a particle size distribution of 2μm for later use.

[0036] S2: Weigh 32 parts of the composite matrix stress luminescent powder, 12 parts of sodium alginate, 3 parts of ZnCl2, and 40-55 parts of polydimethylsiloxane prepolymer prepared above. Add the above components to 1.2 times the amount of anhydrous ethanol of the raw materials and disperse them for 30 minutes using an ultrasonic disperser to ensure that the powder and each component are mixed evenly. Place the mixed slurry in a vacuum oven to degas for 20-30 minutes to remove air bubbles.

[0037] The degassed slurry is coated onto a mold or substrate, with a thickness of approximately 100 μm. It is then placed in an oven and heat-cured at 82°C for 3 hours to obtain a composite matrix stress luminescent material.

[0038] Example 5 The specific steps for preparing composite matrix stress-luminescent materials are as follows: S1: First, the composite matrix stress-luminescent powder is prepared according to the general chemical formula: (Sc 0.8 Zn 0.2 )BO3:Cr 0.02 ,Yb 0.005 ,Sm 0.005 According to the stoichiometric ratio, accurately weigh 85.75 parts Sc2O3, 10.71 parts ZnO, 40.67 parts H3BO3, 1.00 parts Cr2O3, 0.65 parts Yb2O3, and 0.57 parts Sm2O3. Place the raw materials in a ball mill jar, add an appropriate amount of ethanol, and wet ball mill and mix for 4 hours. After drying, put them into a crucible, place the crucible in a tube furnace, introduce argon gas for protection, heat to 1390℃ and hold for 6 hours. After natural cooling, take out the sintered material, ball mill again and sieve to screen out powder with a particle size distribution of 1~5μm for later use.

[0039] S2: Weigh 39 parts of the composite matrix stress luminescent powder, 14 parts of sodium alginate, 4 parts of ZnCl2, and 54 parts of polydimethylsiloxane prepolymer prepared above. Add the above components to 1.2 times the amount of anhydrous ethanol of the raw materials and disperse them for 30 minutes using an ultrasonic disperser to ensure that the powder and each component are mixed evenly. Place the mixed slurry in a vacuum oven to degas for 29 minutes to remove bubbles.

[0040] The degassed slurry is coated onto a mold or substrate, with a thickness of approximately 100 μm. It is then placed in an oven and heat-cured at 89°C for 3 hours to obtain a composite matrix stress luminescent material.

[0041] Comparative Example 1 Sodium alginate and zinc chloride were removed, and only the composite matrix stress luminescent powder and polydimethylsiloxane prepolymer were retained. The remaining steps were the same as in Example 1.

[0042] Comparative Example 2 Sodium alginate was retained but zinc chloride was removed. A three-component composite matrix stress luminescent powder, sodium alginate, and polydimethylsiloxane prepolymer were used. The remaining steps were the same as in Example 1.

[0043] Comparative Example 3 Zinc chloride is retained but sodium alginate is removed. A three-component composite matrix stress luminescent powder, zinc chloride, and polydimethylsiloxane prepolymer are used. The remaining steps are the same as in Example 1.

[0044] The composite matrix stress-luminescent materials prepared in Examples 1-5 and Comparative Examples 1-3 were subjected to the following performance tests: 1. Self-recovery time Referring to GB / T1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets", a uniform damage method with fixed-size cuts was adopted, and the time of damage completion was set as t=0. The samples were placed in a specified healing environment and sampled for 5 minutes at set time points. The tensile test was performed again at each time point using independent samples, and the recovery rate was calculated. The shortest time to first reach ≥90% was the mechanical self-recovery time.

[0045] 2. Photoelectric time Referring to GB / T5700-2023 "Methods for Measuring Lighting", the mechanical excitation method and parameters such as bending radius / frequency / number of times or load / displacement / frequency are fixed and recorded throughout the process. The baseline photoelectric index of the undamaged sample is measured under the same excitation. The unified damage method consistent with mechanics is adopted and t=0 is recorded. The shortest time for the recovery rate to first reach ≥90% is calculated, which is the photoelectric self-recovery time.

[0046] 3. Environmental adaptability Referring to GB / T2423.3-2016 "Environmental Testing - Part 2: Test Methods - Test Cab: Constant Humidity and Heat Test", constant humidity and heat conditions and duration were set. The samples were placed as required and the actual temperature and humidity of the chamber were recorded. After the test, the samples were removed from the chamber and the time of removal was taken as t=0. The samples were allowed to stand in the specified recovery environment. The photoelectric and mechanical self-recovery times were measured again at time points, and the recovery rates were calculated. The shortest time to reach ≥90% for the first time was taken as the environmental photoelectric self-recovery time and the environmental mechanical self-recovery time, respectively.

[0047] The performance test results of the composite matrix stress luminescent materials prepared in Examples 1-5 and Comparative Examples 1-3 are shown in Table 1: Table 1: Performance test results of the examples and comparative examples:

[0048] By comparing the performance data of the embodiments and comparative examples, this invention can clearly demonstrate that "sodium alginate-Zn 2+The key role of the "coordination network + hydrogen bond network" in the composite matrix was highlighted. All embodiments outperformed the comparative system in terms of mechanical self-recovery, photoelectric self-recovery, and adaptability to humid and hot environments. The self-recovery time was generally shortened to 1 / 2 to 1 / 4 of the original, and the recovery speed under humid and hot environments was increased by 4 to 6 times, with a decrease in luminescence intensity fluctuations. Among them, Example 2 showed the best overall performance, with the most stable network structure and the highest powder energy level matching degree. It exhibited the fastest recovery speed and the least environmental fluctuation in all three dimensions. Examples 1, 4, and 5 also showed stable performance and were superior to the comparative examples. Example 3 was inferior to the other examples due to its composition deviating from the optimal range.

[0049] The performance of Comparative Examples 1-3 demonstrates the negative impact of "missing or incomplete dual-network structure" on material properties. Comparative Example 1, without sodium alginate and ZnCl2, exhibits extremely slow self-recovery and the greatest environmental fluctuation. Comparative Example 2, although slightly improved due to the presence of sodium alginate, still suffers from limited performance due to the lack of coordination crosslinking. Comparative Example 3, although containing ZnCl2, fails to form an effective network due to the lack of carboxyl group sources, and its overall performance is even weaker than that of Comparative Example 2. Only when sodium alginate and ZnCl2 are present can the material's performance be improved. 2+ When the two work together to form a stable dual network, the material can achieve rapid self-repair and efficient photoelectric recovery. This structure is the fundamental reason why this type of stress-luminescent composite material achieves high performance.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A composite matrix stress-luminescent material, characterized in that, The composite matrix stress luminescent material comprises the following components by weight: 30-40 parts of composite matrix stress luminescent powder, 10-15 parts of sodium alginate, 2-5 parts of ZnCl2, and 40-55 parts of polydimethylsiloxane prepolymer. According to claim 1, the composite matrix stress-luminescent material is characterized in that the chemical formula of the composite matrix stress-luminescent powder is: (Sc 1-x Zn x )BO3:Cr m ,Yb n ,Sm p , where 0.10≤x≤0.25, 0.015≤m≤0.030, 0.005≤n≤0.015, and 0.005≤p≤0.

012.

2. A method for preparing the composite matrix stress-luminescent material according to any one of claims 1 to 2, comprising the following steps: S1: Sc2O3, ZnO, H3BO3, Cr2O3, Yb2O3 and Sm2O3 were weighed according to the stoichiometric ratio, and the composite matrix stress luminescent powder was obtained by wet ball milling and sintering. S2: Mix the composite matrix stress luminescent powder, sodium alginate, ZnCl2 and polydimethylsiloxane prepolymer in the specified amounts, add anhydrous ethanol and ultrasonically disperse for 30 minutes, vacuum degas for 20-30 minutes, and then cure at 80-90℃ for 3 hours to obtain the composite matrix stress luminescent material.

3. The composite matrix stress-luminescent material according to claim 3, characterized in that, The composite matrix stress luminescent powder is prepared by subjecting Sc2O3, ZnO, H3BO3, Cr2O3, Yb2O3, and Sm2O3 to a high-temperature solid-state reaction under an argon atmosphere, with a sintering temperature of 1300~1400℃ and a holding time of 4~6 hours. After sintering, the powder is ball-milled to control the particle size to 1~5μm.

4. The method for preparing composite matrix stress-luminescent materials according to claim 3, characterized in that, In step S1, the coordination ratio of Zn ions in ZnO to sodium alginate carboxyl groups is 1.2:

1.

5. The composite matrix stress-luminescent material according to claim 3, characterized in that, The composite matrix stress luminescent material in step S2 has a thickness of 80~120μm, a bendable radius of curvature ≤2mm, maintains stable luminescent performance at 20~98% relative humidity, and has environmental performance fluctuations ≤3%.

6. A composite matrix stress-luminescent material according to claim 3, characterized in that, It can be applied in flexible electronic skin, pressure sensors, tactile recognition devices, and tactile units for health monitoring patch robots.

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