Device and method for testing mechanoluminescence efficiency based on integrating sphere

Abstract

The invention discloses a mechanoluminescence efficiency testing device and method based on an integrating sphere, and the device comprises a standard light source which is used for generating a standard light signal; the integrating sphere is used for collecting optical signals generated by the standard light source and the test sample; the test sample is an elastic film with mechanoluminescence performance, and mechanoluminescence is realized through stretching; the optical fiber spectrometer is used for converting an optical signal output from the integrating sphere into a digital signal; the mechanical load applying device is used for applying tensile acting force to the test sample, so that the test sample is deformed to generate photon emission; in the first working state, the standard light source is arranged in front of the integrating sphere; in the second working state, the standard light source is removed, the test sample is tightly attached right in front of the light inlet hole of the integrating sphere, and the mechanical load applying device is used for applying tensile acting force to the test sample. The mechanoluminescence efficiency testing device and the mechanoluminescence efficiency testing method provided by the invention have universality, and are applicable to different mechanoluminescence materials with stretchability.

Description

Technical Field

[0001] This invention relates to the field of mechanoluminescent material performance testing technology, specifically to a mechanoluminescence efficiency testing device and method based on an integrating sphere. Background Technology

[0002] Mechatronic materials are a class of advanced sensing materials that can convert mechanical energy into photons upon mechanical stimulation. They only require simple mechanical stimulation to produce a luminescent response without the need for other types of energy (such as light, heat, or electricity), offering advantages such as reliable sensing, real-time monitoring, and convenience. They hold immense application potential in areas such as passive nighttime lighting, human-computer interaction, mechanical structure health monitoring, and optical anti-counterfeiting. Although numerous mechatronic materials and a range of potential applications have been reported, significant shortcomings remain in objectively and systematically evaluating the performance and applications of different mechatronic materials. This is primarily due to the lack of standardized testing methods in the field of mechatronic material research, particularly for characterizing mechatronic intensity. Different testing methods or devices yield different results, making material performance evaluation and new material development extremely inconvenient.

[0003] An integrating sphere is a key device for optical measurement and characterization of materials, its core principle based on the uniform scattering and integration effect of light. The integrating sphere plays a crucial role in measuring photoluminescence quantum efficiency, including internal quantum efficiency (IQE) and external quantum efficiency (EQE). Photoluminescence quantum efficiency is an important indicator of the luminescence intensity of fluorescent materials. By uniformly collecting all light signals emitted by the sample (including direct and scattered light), and combining this with the calibration of the light source and detector, the integrating sphere provides an effective solution for measuring photoluminescence efficiency. Its testing principle is based on the following formula:

[0004]

[0005] Where, η pL N represents the photoluminescence quantum efficiency (here, the external quantum efficiency). E N represents the number of emitted photons. I The number of incident photons is given. Since both input and output energy are photons, the above formula clearly reflects the utilization rate of the photoluminescent material for incident photons without energy conversion. The integrating sphere can uniformly distribute the incident and emitted photons and guide them into the optical fiber and detector.

[0006] By utilizing the photon homogenization and conduction functions of the integrating sphere and through calibration with a standard light source, the number of photons emitted by the material can be obtained. Nevertheless, mechanoluminescence efficiency is the efficiency by which a material converts input mechanical energy into light energy. Due to the conversion between different energy forms involved, the above formula (1) cannot be used directly; at the same time, modifications to the testing device based on the integrating sphere are also required.

[0007] Based on the fundamental principles of mechanoluminescence, mechanoluminescence efficiency is defined as:

[0008]

[0009] Where, η ML For mechanoluminescence efficiency, EM represents the input mechanical energy, and EP represents the emitted photon energy. The input mechanical energy is the amount of work done by the mechanical action on the mechanoluminescent material, and the emitted photon energy is the total energy of photons emitted by the material during the mechanical action.

[0010] Using the above formula (2), it is expected to be possible to determine the mechanoluminescence efficiency, solving the problem that it is difficult to compare the mechanoluminescence efficiency of different materials. However, so far, no mechanoluminescence efficiency testing device or method based on integrating sphere has been reported. The main difficulty is that the existing quantum efficiency testing methods do not take into account the conversion of different energy types and are not suitable for mechanoluminescence efficiency testing. Summary of the Invention

[0011] To address the aforementioned problems, this invention provides a mechanoluminescence efficiency testing device and method based on an integrating sphere.

[0012] To achieve the above objectives, the present invention provides the following technical solution:

[0013] A mechanoluminescence efficiency testing device based on an integrating sphere includes:

[0014] Standard light source, used to generate standard light signals;

[0015] An integrating sphere is used to collect light signals generated by a standard light source and a test sample; the test sample is an elastic film with mechanoluminescence properties, which achieves mechanoluminescence through stretching.

[0016] A fiber optic spectrometer, which is connected to an integrating sphere via optical fiber, is used to convert the optical signal output from the integrating sphere into a digital signal;

[0017] A mechanical load application device is used to apply tensile force to a test sample, causing it to deform and emit photons.

[0018] The mechanoluminescence efficiency testing device based on an integrating sphere includes a first working state and a second working state;

[0019] In the first working state, the standard light source is positioned directly in front of the integrating sphere;

[0020] In the second working state, the standard light source is removed, the test sample is tightly attached to the front of the light inlet of the integrating sphere, and a tensile force is applied to the test sample through the mechanical load application device.

[0021] Furthermore, the mechanical load application device can apply a tensile force to the test sample and accurately obtain the energy of the mechanical action applied to the test sample.

[0022] As one possible implementation, the mechanical load application device is further selected as a free-fall device, which is positioned directly below the test sample and connected to the test sample via a clamp; wherein, the free-falling object sample selected for the free-fall device can be of different materials, and the mass of the object sample of different materials needs to be confirmed.

[0023] Furthermore, the standard spectral parameters of the standard light source and the photon energy corresponding to each wavelength range in the spectrum are known; specifically, the standard light source can be a calibrated D50 light source, D65 light source, or D75 light source, etc.

[0024] Furthermore, the fiber optic spectrometer also includes a signal processing module, which converts the optical signals acquired by the fiber optic spectrometer into digital signals and transmits them to a computer terminal.

[0025] Furthermore, the test sample is a mechanoluminescent elastic film, which is a composite material formed by mechanoluminescent powder material and organic elastomer. When subjected to mechanical force, it will emit photons, and the emission intensity is positively correlated with the magnitude of the mechanical force.

[0026] Furthermore, the mechanoluminescent powder material includes: ZnS:Cu, BaMgAl 12 O 17 :Eu, Sr2Ga2GeO7:Cr, Ca2Ga2SiO7:Tb, B2O3-SiO2-ZnO:Ln, SrGa 12 O 19 :Cr, Sr3Al2O5Cl2:Eu, CaF2:Tb, Sr5(PO4)3Cl:Eu, M5(PO4)3X:Eu, β-SiAlON:Eu, Y3Al5O 12 Ce, Lu3Al5O 12 At least one of Ce;

[0027] Where Ln is Tb, Eu, Dy, Ho, Er, Sm, Pr, Nd, Tm, Ce, Gd or Yb, M is Ca, Sr or Ba, and X is Cl or Br;

[0028] The organic elastomer includes any one of polydimethylsiloxane, epoxy resin, polymethyl methacrylate, and Ecoflex.

[0029] Furthermore, in the first working state, the center position of the standard light source and the center position of the integrating sphere's light inlet are on the same horizontal line.

[0030] This invention also provides a method for testing mechanoluminescence efficiency based on an integrating sphere, using the aforementioned mechanoluminescence efficiency testing device based on an integrating sphere; the method includes the following steps:

[0031] S1: Place the standard light source directly in front of the integrating sphere, with the center of the standard light source and the center of the integrating sphere at the same level. Turn on the standard light source and collect spectrum I through the integrating sphere and fiber optic spectrometer. 灯 (λ) and integration time t 积 ;

[0032] S2: Remove the standard light source, place the test sample firmly against the front of the integrating sphere's light inlet, and apply force to the test sample using a mechanical loading device to cause it to undergo elastic deformation and emit light. Collect the spectrum I using the integrating sphere and fiber optic spectrometer. 样 (λ) and integration time t 积 ';

[0033] S3: Based on the collected spectral and integration time data and the total mechanical energy exerted on the test sample by the mechanical load application device, calculate the mechanoluminescence efficiency η of the test sample.

[0034] Furthermore, the expression for the mechanoluminescence efficiency η is as follows:

[0035] η = E 样总 / E M

[0036] Among them, E M E is the total mechanical energy exerted by the mechanical load application device on the test sample. 样总 The energy of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as: E 样总 =P 样总 ×t 积 ';

[0037] Among them, P 样总 The integral power of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as follows: λ1 and λ2 represent the emission peak ranges of the mechanoluminescent powder material in the test sample;

[0038] P 样总 The expression for (λ) is:

[0039] Among them, P 灯总 (λ) is obtained through the correspondence between the power and wavelength of light emitted by a standard light source; k1 = S 孔 / S 灯 S 灯 =4πr 灯 2 S 孔 r represents the area of ​​the light-gathering aperture of the integrating sphere. 灯 This represents the distance between the standard light source and the aperture of the integrating sphere; k2 = S 孔 / S 样 S 样 This indicates the area of ​​the luminescent region after the test sample is stretched.

[0040] The beneficial effects of this invention are as follows:

[0041] This invention utilizes an integrating sphere, through structural modifications (simultaneously meeting the requirements of standard light source application, mechanical loading, and precise photon detection) and the measurement of multiple types of physical parameters (including photon energy and mechanical energy), to overcome the limitations of traditional integrating sphere testing of fluorescence quantum efficiency. It establishes a convenient, universal, and accurate standardized platform for mechanoluminescence efficiency. The establishment of this mechanoluminescence testing equipment will fill the gap in objective evaluation of the performance and applications of mechanoluminescent materials, helping researchers to intuitively, concretely, and systematically understand mechanoluminescence and analyze its principles. It will deepen research on the properties of mechanoluminescent materials, propelling mechanoluminescence from laboratory mechanism research to industrial applications and leading to more innovative applications. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of a mechanoluminescence efficiency testing device based on an integrating sphere.

[0044] Figure 2 The spectrum I collected by the fiber optic spectrometer from the standard light source via the integrating sphere 灯 (λ);

[0045] Figure 3The light generated when the ZnS:Cu@PDMS thin film is subjected to stress is collected by a fiber optic spectrometer via an integrating sphere. 样 (λ);

[0046] Figure 4 The relationship between the power and wavelength of a standard light source at rated power (P) 灯总 (λ);

[0047] Figure 5 The relationship between the power of mechanoluminescence generated by ZnS:Cu@PDMS thin films under mechanical load and the wavelength (P) 样总 (λ).

[0048] The labels in the attached diagram are as follows:

[0049] Standard light source-11; Integrating sphere-12; Fiber optic spectrometer-13; Test sample-14; Mechanical load application device-15. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of 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 some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] See attached document Figure 1 As shown, this embodiment provides a mechanoluminescence efficiency testing device based on an integrating sphere, comprising:

[0052] A standard light source 11 is used to generate a standard optical signal. The standard light source 11 has known standard spectral parameters and the photon energy corresponding to each wavelength range in the spectrum. In this embodiment, the standard light source 11 is a rigorously calibrated halogen lamp ICS-600-J9 with a rated voltage of 12V and a rated current of 2.6A. It is understood that in other embodiments, the standard light source may also be a rigorously calibrated D50, D65, or D75 light source, etc. The standard light source 11 can provide a standard spectrum and the photon energy corresponding to each wavelength range in the spectrum.

[0053] The integrating sphere 12 is used to weaken and collect the light signals generated by the standard light source 11 and the test sample 14; in this embodiment, the diameter of the light-entry aperture of the integrating sphere is 1 cm. The test sample 14 is an elastic film with mechanoluminescence properties, which achieves mechanoluminescence through stretching.

[0054] Specifically, test sample 14 is a composite material formed by mechanoluminescent powder and organic elastomer. It emits photons when subjected to mechanical force, and the emission intensity is positively correlated with the magnitude of the applied mechanical force. The mechanoluminescent powder material includes, but is not limited to: ZnS:Cu, BaMgAl. 12 O 17 :Eu, Sr2Ga2GeO7:Cr, Ca2Ga2SiO7:Tb, B2O3-SiO2-ZnO:Ln, SrGa 12 O 19 :Cr, Sr3Al2O5Cl2:Eu, CaF2:Tb, Sr5(PO4)3Cl:Eu, M5(PO4)3X:Eu, β-SiAlON:Eu, Y3Al5O 12 Ce, Lu3Al5O 12 At least one of Ce; wherein Ln is Tb, Eu, Dy, Ho, Er, Sm, Pr, Nd, Tm, Ce, Gd or Yb, M is Ca, Sr or Ba, and X is Cl or Br.

[0055] Organic elastomers include, but are not limited to, polydimethylsiloxane, epoxy resin, polymethyl methacrylate, Ecoflex, etc.

[0056] The fiber optic spectrometer 13 is connected to the integrating sphere 12 via an optical fiber and is used to convert the optical signal output from the integrating sphere 12 into a digital signal. Specifically, the fiber optic spectrometer 13 includes a signal processing module, which converts the optical signal acquired by the fiber optic spectrometer 13 into a digital signal and transmits it to a computer terminal.

[0057] The mechanical load application device 15 is used to apply a tensile force to the test sample 14, causing it to deform and emit photons. Specifically, the mechanical load application device 15 can apply a tensile force to the mechanoluminescent elastic film test sample 14, and needs to accurately measure the energy of the mechanical force applied to the mechanoluminescent elastic film. The mechanical load application device 15 can be a free-fall device, which provides an application device capable of estimating the mechanical load applied to the test sample. The free-fall device is positioned directly below the mechanoluminescent elastic film and is connected to the test sample 14 by a clamp. The free-falling object sample selected for the falling ball device can be of different materials, and the mass of the object sample of different materials needs to be confirmed.

[0058] The mechanoluminescence efficiency testing device based on an integrating sphere includes a first working state and a second working state.

[0059] In the first working state, the standard light source is set directly in front of the integrating sphere, and the center of the standard light source 11 is on the same horizontal line as the center of the light inlet of the integrating sphere.

[0060] In the second working state, the standard light source is removed, the test sample is tightly attached to the front of the light inlet of the integrating sphere, and a tensile force is applied to the test sample through the mechanical load application device.

[0061] This embodiment also provides a mechanoluminescence efficiency testing method based on an integrating sphere, using the aforementioned mechanoluminescence efficiency testing device based on an integrating sphere; the method includes the following steps:

[0062] S1: Place the standard light source 11 directly in front of the integrating sphere, with the center of the standard light source 11 and the center of the integrating sphere at the same level. Turn on the standard light source and collect spectrum I through the integrating sphere 12 and the fiber optic spectrometer 13. 灯 (λ) and integration time t 积 ;

[0063] S2: Remove the standard light source, place the test sample firmly against the front of the integrating sphere's light inlet, and apply force to the test sample using a mechanical loading device to cause it to undergo elastic deformation and emit light. Collect the spectrum I using the integrating sphere and fiber optic spectrometer. 样 (λ) and integration time t 积 ';

[0064] S3: Based on the collected spectral and integration time data, and the total mechanical energy exerted by the mechanical load application device 15 on the test sample 14, the mechanoluminescence efficiency η of the test sample 14 is calculated; specifically, the expression for the mechanoluminescence efficiency η is as follows:

[0065] η = E 样总 / E M

[0066] Among them, E M E is the total mechanical energy exerted by the mechanical load application device on the test sample. 样总 The energy of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as: E 样总 =P 样总 ×t 积 ';

[0067] Among them, P 样总 The integral power of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as follows: λ1 and λ2 represent the emission peak ranges of the mechanoluminescent powder material in the test sample;

[0068] P 样总 The expression for (λ) is:

[0069] Among them, P 灯总(λ) is obtained through the correspondence between the power and wavelength of the light emitted by the standard light source 11; k1 = S 孔 / S 灯 S 灯 =4πr 灯 2 S 孔 r represents the area of ​​the light-gathering aperture of the integrating sphere 12. 灯 This represents the distance between the standard light source 11 and the light entrance aperture of the integrating sphere; k2 = S 孔 / S 样 S 样 This indicates the area of ​​the luminescent region after the test sample is stretched.

[0070] The present invention will be further described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto:

[0071] In this embodiment, a mechanoluminescent test sample 14, namely ZnS:Cu@PDMS, is preferably formed by combining mechanoluminescent powder ZnS:Cu and PDMS. PMMS possesses excellent flexibility and elasticity, preventing damage under significant mechanical deformation, while also exhibiting good transparency. The mass ratio of the mechanoluminescent powder ZnS:Cu to PDMS is between 1:1 and 1:2.

[0072] The thickness of test sample 14 is 0.1 mm to 1 mm. In this embodiment, the thickness of test sample 14 is 0.5 mm, and the length and width are 40 mm and 20 mm, respectively. In other embodiments, the shape of test sample 14 is not limited to a rectangle, but can also be a square, circle, ellipse or other irregular shape, etc.

[0073] In this embodiment, the preparation process of test sample 14 is as follows: A PDMS precursor and curing agent with a mass ratio of 10:1 are mixed in a plastic beaker. ZnS:Cu metronidazole powder and PDMS are added to the mixture at a mass ratio of 1:2, and the mixture is stirred thoroughly for 5 minutes at room temperature. The plastic beaker is transferred to a vacuum drying oven and evacuated for 5 minutes to remove air bubbles. The mixture is poured evenly into a 4cm*4cm*0.5mm acrylic mold, and the mold is transferred to an 80℃ oven for curing for 30 minutes. After naturally cooling to room temperature, test sample 14 with a thickness of 0.5mm is obtained. In other embodiments, the preparation method of test sample 14 is not limited to the above method.

[0074] In this embodiment, the test sample 14 is placed tightly against the front of the light inlet of the integrating sphere 12, and the mechanical load application device 15 is connected to the test sample 14 using a clamp.

[0075] The mechanical load application device 15 is connected to the test sample 14 via a clamp and is placed directly below the test sample 14. In this embodiment, the mechanical load device 15 is a free-fall device, and the weight used in the free-fall device is a weight.

[0076] The standard light source 11 is placed 750mm directly in front of the integrating sphere, with the center of the standard light source 11 and the center of the integrating sphere at the same level. The power supply module output voltage is adjusted to 12V and the current to 2.6A to illuminate the standard light source. After passing through the integrating sphere 12 and the fiber optic spectrometer 13, the collected spectrum is I. 灯 (λ), integration time t 积 The duration is 2s, and the spectrum is shown in the attached image. Figure 2 As shown.

[0077] Remove the standard light source 11, place the test sample 14 firmly against the front of the light inlet of the integrating sphere 12, and connect the weight to the test sample 14 using a clamp. Allow the weight to fall freely, causing the test sample 14 to generate mechanoluminescence under tensile force. The emitted light passes through the integrating sphere 12 and the fiber optic spectrometer 13, and the collected spectrum is I. 样 (λ), integration time t 积 The value is 2s, and the spectrum is shown in the attached image. Figure 3 As shown.

[0078] The weight used in the free-fall device is a 256g weight, which is connected to the test sample 14 via a clamp. The weight falls freely from a height of 6mm.

[0079] Integrating sphere aperture diameter d 孔 It is 10mm thick, and its area is S. 孔 =1 / 4πd 孔 2 =78.5mm 2 The distance between the standard light source 11 and the light entrance aperture of the integrating sphere is 750 mm. Treating it as a point light source, and taking the distance between the standard light source 11 and the light entrance aperture as the radius of the sphere, its sphere area is S. 灯 =4πr 灯 2 =7.06*10 6 mm 2 Therefore, the light entering integrating sphere 12 accounts for k1 = S of the light output by the standard light source at rated power. 孔 / S 灯 =1.11*10 -5 .

[0080] After being stretched by a mechanical load, the luminescent area of ​​the test sample is rectangular, with a length of 40 mm and a width of 20 mm. Since both sides of the composite film emit light after being stretched, the total area of ​​the luminescent region is S. 样=40mm * 20mm * 2 = 1600mm 2 Therefore, the light emitted by the composite film entering the integrating sphere 12 under the stretching effect of the weight during free fall is k2 = S. 孔 / S 样 =4.91*10 -2 .

[0081] The relationship between the power emitted by standard light source 11 and its wavelength at rated power (P) 灯总 (λ) As attached Figure 4 As shown.

[0082] The optical power P entering the integrating sphere from the standard light source 11 灯 (λ)=P 灯总 (λ)*k1; The light power P emitted by test sample 14 after being subjected to mechanical load and entering the integrating sphere is P. 样 (λ)=P 样总 (λ)*k2.

[0083] Under the same test conditions, for each wavelength, the ratio of the light signal intensity I(λ) detected by the spectrometer to the actual light power P(λ) entering the integrating sphere 11 remains constant, that is:

[0084]

[0085] therefore, The relationship between the total power of mechanoluminescence generated by test sample 14 after being subjected to mechanical load and the wavelength is as follows: The results are attached. Figure 5 As shown.

[0086] The emission peak of ZnS:Cu is located in the 400 to 650 nm range. The integral power of the mechanoluminescence generated by the test sample 14 after being subjected to mechanical load for a certain period of time is:

[0087] The energy of the mechanoluminescence produced by test sample 14 under mechanical load for a given period of time is: E 样总 =P 样总 ×t 积 = 1.752 * 10 -7 J.

[0088] The work done by gravity when the weight falls freely (i.e., the total mechanical energy done by the mechanical load application device on the test sample) is E. M =m*g*h=256*10 -3 *9.8*6*10 -3 =0.151J.

[0089] Mechanoluminescence efficiency η = E样总 / E M =1.752*10 -7 / 0.151=1.16*10 -6 .

[0090] In summary, the advantages of the above-mentioned mechanoluminescence efficiency testing method include: 1. The above-mentioned mechanoluminescence efficiency testing method is universal and applicable to various mechanoluminescent materials with stretchability; 2. The method uses an integrating sphere and is compatible with the photoluminescence quantum efficiency testing method.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mechanoluminescence efficiency testing device based on an integrating sphere, characterized in that, include: A standard light source (11) is used to generate standard light signals; An integrating sphere (12) is used to collect light signals generated by a standard light source (11) and a test sample (14); the test sample (14) is an elastic film with mechanoluminescence properties, which achieves mechanoluminescence by stretching; A fiber optic spectrometer (13) is connected to an integrating sphere (12) via an optical fiber and is used to convert the optical signal output from the integrating sphere (12) into a digital signal. Mechanical load application device (15) is used to apply tensile force to the test sample (14) to cause it to deform and generate photon emission; The mechanoluminescence efficiency testing device based on an integrating sphere includes a first working state and a second working state; In the first working state, the standard light source is positioned directly in front of the integrating sphere; In the second working state, the standard light source is removed, the test sample is tightly attached to the front of the light inlet of the integrating sphere, and a tensile force is applied to the test sample through the mechanical load application device.

2. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 1, characterized in that, The mechanical load application device (15) can apply a tensile force to the test sample (14) and can accurately obtain the energy of the mechanical action applied to the test sample (14).

3. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 2, characterized in that, The mechanical load application device (15) is a free fall device, which is located directly below the test sample (14) and is connected to the test sample (14) by a clamp.

4. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 1, characterized in that, The standard spectral parameters of the standard light source (11) and the photon energy corresponding to each wavelength range in the spectrum are known.

5. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 1, characterized in that, The fiber optic spectrometer (13) also includes a signal processing module, which converts the optical signal acquired by the fiber optic spectrometer (13) into a digital signal and transmits it to a computer terminal.

6. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 1, characterized in that, The test sample (14) is a mechanoluminescent elastic film, which is a composite material formed by mechanoluminescent powder material and organic elastomer. When subjected to mechanical force, it will emit photons, and the emission intensity is positively correlated with the magnitude of the mechanical force.

7. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 6, characterized in that, The mechanoluminescent powder material includes: ZnS:Cu, BaMgAl 12 O 17 :Eu, Sr2Ga2GeO7:Cr, Ca2Ga2SiO7:Tb, B2O3-SiO2-ZnO:Ln, SrGa 12 O 19 :Cr, Sr3Al2O5Cl2:Eu, CaF2:Tb, Sr5(PO4)3Cl:Eu, M5(PO4)3X:Eu, β-SiAlON:Eu, Y3Al5O 12 Ce, Lu3Al5O 12 At least one of Ce; Where Ln is Tb, Eu, Dy, Ho, Er, Sm, Pr, Nd, Tm, Ce, Gd or Yb, M is Ca, Sr or Ba, and X is Cl or Br; The organic elastomer includes any one of polydimethylsiloxane, epoxy resin, polymethyl methacrylate, and Ecoflex.

8. The mechanoluminescence efficiency testing device based on an integrating sphere according to claim 1, characterized in that, In the first working state, the center position of the standard light source (11) and the center position of the integrating sphere's light inlet are on the same horizontal line.

9. A method for testing mechanoluminescence efficiency based on an integrating sphere, characterized in that, The method utilizes the mechanoluminescence efficiency testing device based on an integrating sphere as described in any one of claims 1 to 8; the method comprises the following steps: S1: Place the standard light source (11) directly in front of the integrating sphere, with the center of the standard light source (11) and the center of the integrating sphere at the same level. Turn on the standard light source and collect the spectrum I through the integrating sphere (12) and the fiber optic spectrometer (13). 灯 (λ) and integration time t 积 ; S2: Remove the standard light source, place the test sample firmly against the front of the integrating sphere's light inlet, and apply force to the test sample using a mechanical loading device to cause it to undergo elastic deformation and emit light. Collect the spectrum I using the integrating sphere and fiber optic spectrometer. 样 (λ) and integration time t 积 '; S3: Based on the collected spectral and integral time data and the total mechanical energy applied to the test sample (14) by the mechanical load application device (15), calculate the mechanoluminescence efficiency η of the test sample (14).

10. The method for testing mechanoluminescence efficiency based on an integrating sphere according to claim 9, characterized in that, The expression for the mechanoluminescence efficiency η is as follows: η=E 样总 / AND M Among them, E M E is the total mechanical energy exerted by the mechanical load application device on the test sample. 样总 The energy of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as: E 样总 =P 样总 ×t 积 '; Among them, P 样总 The integral power of the mechanoluminescence produced by the test sample during the duration of mechanical load application is expressed as follows: λ1 and λ2 represent the emission peak ranges of the mechanoluminescent powder material in the test sample; P 样总 The expression for (λ) is: Among them, P 灯总 (λ) is obtained through the correspondence between the power and wavelength of the light emitted by the standard light source (11); k1 = S 孔 / S 灯 S 灯 =4πr 灯 2 S 孔 r represents the area of ​​the light-gathering aperture of the integrating sphere (12). 灯 This represents the distance between the standard light source (11) and the light entrance aperture of the integrating sphere; k2 = S 孔 / S 样 S 样 This indicates the area of ​​the luminescent region after the test sample is stretched.

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