Thermochromic luminescent material, method for preparing same and use thereof

Abstract

This invention discloses a thermochromic luminescent material, its preparation method, and its applications. The general chemical formula of the thermochromic luminescent material is RbCd. (1‑x) Mn x Cl3; x is the mole fraction, with a value ranging from 0 < x ≤ 15%. The thermochromic luminescent material provided by this invention exhibits significant thermochromic luminescence characteristics. At room temperature, RbCd... (1‑x) Mn x Cl3 belongs to the orthorhombic crystal system with space group Pnma. Under ultraviolet light irradiation, it exhibits red light emission. When RbCd... (1‑x) Mn x When Cl3 is heated to above 420K, its crystal structure changes to a tetragonal system with a space group of P4 / mbm, exhibiting yellow light emission. Furthermore, the fluorescence intensity of this thermochromic luminescent material increases with increasing temperature during the temperature variation process from 160K to 420K, demonstrating a significant resistance to thermal quenching. In addition, this invention provides a simple synthesis process with mild reaction conditions, abundant and inexpensive raw materials, solving the problems of lead toxicity and instability in lead-based halide crystals, and is expected to be widely used in intelligent responsive luminescence, anti-counterfeiting, and temperature measurement fields.

Description

Technical Field

[0001] This invention relates to the field of thermochromic luminescent materials technology. More specifically, it relates to a thermochromic luminescent material, its preparation method, and its applications. Background Technology

[0002] Spectral-responsive thermochromic luminescent materials (TLMs) have attracted widespread attention due to their cutting-edge applications in temperature visualization and sensing technologies. Commercially available thermocouples and infrared thermometers both have limitations. In devices using electromagnetic induction heating, traditional thermocouples are unsuitable due to material limitations, while limited penetration and unavoidable background signal interference restrict the application of infrared thermometers. Luminescent metal halide perovskites, with their tunable color and inexpensive synthesis process, have generated significant research interest in the optoelectronic field. Furthermore, the reversible color change of TLMs with temperature allows for the combination of luminescent and thermochromic materials in optical temperature indicators.

[0003] Metal halides (CsPbX3) have been extensively studied and reported in the field of thermochromic light. However, due to the toxicity of traditional lead halide perovskites, they are environmentally unfriendly in practical commercial applications, causing serious health problems even under extremely low exposure conditions. In recent years, researchers have focused on developing lead-free thermochromic luminescent materials. However, the types of publicly reported thermochromic luminescent materials are still relatively few. Therefore, the exploration of novel lead-free metal halide materials with excellent thermochromic luminescence properties, stability, and easy tunability has attracted considerable attention. Summary of the Invention

[0004] To address the aforementioned problems, the first objective of this invention is to provide a thermochromic luminescent material. The thermochromic luminescent material provided by this invention induces exciton trapping and Mn+ ionization by partially replacing cadmium ions in the RbCdCl3 crystal structure with a very small amount of manganese ions. 2+ The spin-forbidden dd transition of ions enables differentiated luminescence at room temperature and 420K, exhibiting obvious reversible thermochromic luminescence characteristics.

[0005] The second objective of this invention is to provide a method for preparing the aforementioned thermochromic luminescent material. This invention features a simple synthesis process, mild reaction conditions, abundant and inexpensive raw materials, and solves the problems of lead toxicity and instability in lead-based halide crystals. It is expected to be widely applied in the fields of intelligent responsive luminescence, anti-counterfeiting, and temperature measurement.

[0006] The third objective of this invention is to provide an application of the above-mentioned thermochromic luminescent material in intelligent response luminescence, anti-counterfeiting, and temperature detection.

[0007] The fourth objective of this invention is to provide an anti-counterfeiting material.

[0008] The fifth objective of this invention is to provide a temperature detection device.

[0009] To achieve the first objective mentioned above, the present invention adopts the following technical solution:

[0010] This invention discloses a thermochromic luminescent material, wherein the general chemical formula of the thermochromic luminescent material is RbCd. (1-x) Mn x Cl3 is a colorless needle-like single crystal;

[0011] Where x is the mole fraction, and its value ranges from 0 < x ≤ 15%.

[0012] The thermochromic luminescent material provided by this invention, through the doping of a very small amount of manganese ions, achieves a response to external environmental temperature stimuli, undergoing a change in crystal structure and exhibiting obvious reversible thermochromic luminescence characteristics. Specifically, at room temperature, the thermochromic luminescent material belongs to the orthorhombic crystal system with space group Pnma, and its emission peak is located at 575nm, exhibiting red light emission. When the thermochromic luminescent material is heated to above 420K, its crystal structure changes to the tetragonal crystal system, the space group becomes P4 / mbm, and the emission peak is located at 575nm, exhibiting yellow light emission. Furthermore, after the thermochromic luminescent material is restored from a temperature above 420K to room temperature, it is found that the thermochromic luminescent material can still maintain yellow light emission for a relatively long time; that is, it can maintain yellow light emission after being placed in air for 12 hours, and then gradually changes to red light emission. Under sealed storage (non-vacuum environment), it can maintain yellow light emission for at least 2 days, after which it gradually changes to red light emission.

[0013] The thermochromic luminescent material provided by this invention exhibits increased red fluorescence intensity and increased yellow fluorescence intensity with increasing manganese doping intensity under ultraviolet light excitation at wavelengths of 200-400 nm. When the chemical formula of the thermochromic luminescent material is RbCd... 93.91％ Mn 6.09％ In Cl3, the yellow fluorescence intensity reaches its highest level, and the quantum yield reaches 100%, confirming that the more symmetrical tetragonal phase is more favorable for Mn. 2+ The photoluminescence of the thermochromic luminescent material was also observed. Furthermore, it was discovered that the fluorescence intensity of this thermochromic luminescent material increases with increasing temperature within the range of 160K-420K, exhibiting a significant resistance to thermal quenching. Therefore, due to its excellent reversible fluorescence color-changing properties, it holds promise for widespread application in fields such as intelligent responsive luminescence, anti-counterfeiting, and temperature detection.

[0014] The experiment also found that, over the entire range of x values, i.e., 0 < x ≤ 15%, RbCd (1-x) Mnx Cl3 can retain the original crystal structure of RbCdCl3 and exhibit obvious reversible thermochromic properties. Considering the thermochromic properties, when the value of x is in the range of 0 < x ≤ 0.4% and 5 ≤ x ≤ 7%, significant differential luminescence occurs with temperature changes. Specifically, when x is in the range of 0 < x ≤ 0.4%, relatively weak red light emission is observed at room temperature, and relatively strong yellow light emission is observed at 420 K. When x is in the range of 5 ≤ x ≤ 7%, relatively strong red light emission is observed at room temperature, and relatively stronger yellow light emission is observed at 420 K. Within these ranges, obvious luminescence and color change can be observed. In one specific embodiment, to obtain higher fluorescence intensity and quantum yield, it is preferable to control the value of x to be in the range of 5-7%.

[0015] To achieve the second objective mentioned above, the present invention adopts the following technical solution:

[0016] This invention discloses a method for preparing the thermochromic luminescent material as described above, comprising the following steps:

[0017] A rubidium-containing compound, a cadmium-containing compound, and a manganese-containing compound were mixed and then heated in a hydrogen chloride solution until dissolved. The reaction mixture was then transferred to a hydrothermal reactor lined with polytetrafluoroethylene (PTFE) for hydrothermal reaction. After the reaction was completed, the mixture was cooled, filtered, and washed to obtain RbCd. (1-x) Mn x Cl3 single crystal.

[0018] Furthermore, the rubidium-containing compound is selected from one or more of rubidium-containing oxides (e.g., rubidium oxide), rubidium-containing hydroxides (e.g., rubidium hydroxide), and rubidium-containing chlorides (e.g., rubidium chloride);

[0019] The cadmium-containing compound is selected from one or more of cadmium-containing oxides (e.g., cadmium oxide), cadmium-containing hydroxides (e.g., cadmium hydroxide), and cadmium-containing chlorides (e.g., cadmium chloride);

[0020] The manganese-containing compound is selected from one or more of manganese oxides (e.g., manganese oxide), manganese hydroxides (e.g., manganese hydroxide), and manganese chlorides (e.g., manganese chloride).

[0021] Furthermore, the temperature of the hydrothermal reaction is 360-400K, and the time of the hydrothermal reaction is 2-8h.

[0022] Furthermore, the molar ratio of the rubidium-containing compound, the cadmium-containing compound, and the manganese-containing compound is 1:(0.4-0.95):(0.05-0.6). The molar ratio of the manganese-containing compound to the cadmium-containing compound should not be too large, as this may affect the crystal form of the final compound, making it difficult for it to maintain the original RbCdCl3 crystal structure and causing it to transform into other crystal phase structures.

[0023] Furthermore, the mass concentration of the hydrogen chloride solution is 20-38%.

[0024] Furthermore, the process includes drying after washing, with the drying temperature being 30-50°C and the drying time being 2-24 hours.

[0025] To achieve the third objective mentioned above, the present invention adopts the following technical solution:

[0026] This invention discloses an application of the thermochromic luminescent material described above in intelligent response luminescence, anti-counterfeiting, and temperature detection.

[0027] To achieve the fourth objective mentioned above, the present invention adopts the following technical solution:

[0028] This invention discloses an anti-counterfeiting material comprising the thermochromic luminescent material described above.

[0029] To achieve the fifth objective mentioned above, the present invention adopts the following technical solution:

[0030] This invention discloses a temperature detection device comprising the thermochromic luminescent material as described above.

[0031] The beneficial effects of this invention are as follows:

[0032] This invention discloses a thermochromic luminescent material, wherein the general chemical formula of the thermochromic luminescent material is RbCd. (1-x) Mn x Cl3, through doping with a very small amount of manganese ions, achieves a response to external environmental temperature stimuli, undergoing a change in crystal structure and exhibiting obvious reversible thermochromic luminescence properties. Specifically, at room temperature, the thermochromic luminescent material belongs to the orthorhombic crystal system with space group Pnma, and its emission peak is located at 575nm, exhibiting red light emission. When the thermochromic luminescent material is heated to above 420K, its crystal structure changes to the tetragonal crystal system, the space group becomes P4 / mbm, and the emission peak is located at 575nm, exhibiting yellow light emission. Furthermore, after the thermochromic luminescent material is restored from a temperature above 420K to room temperature, it is found that the thermochromic luminescent material can still maintain yellow light emission for a relatively long time; that is, it can maintain yellow light emission after being placed in air for 12 hours, and then gradually switch to red light emission. Under sealed storage (non-vacuum environment), it can maintain yellow light emission for at least 2 days, after which it gradually switches to red light emission.

[0033] The thermochromic luminescent material disclosed in this invention exhibits increased red fluorescence intensity and increased yellow fluorescence intensity with increasing manganese doping intensity under ultraviolet light excitation at wavelengths of 200-400 nm. When the chemical formula of the thermochromic luminescent material is RbCd... 93.91％Mn 6.09％ In Cl3, the yellow fluorescence intensity reaches its highest level, and the quantum yield can reach 100%, confirming that the more symmetrical tetragonal phase is more favorable for Mn. 2+ Photoluminescence.

[0034] The thermochromic luminescent material disclosed in this invention exhibits a significant anti-thermal quenching effect, with its fluorescence intensity increasing as the temperature rises from 160K to 420K.

[0035] The thermochromic luminescent material disclosed in this invention not only maintains the original crystal structure of RbCdCl3, but also induces exciton self-trapping and Mn... 2+ The spin of ions prohibits dd transitions, thereby enabling structural changes in response to external environmental temperature stimuli.

[0036] This invention also provides a synthesis process that is simple, has mild reaction conditions, uses abundant and inexpensive raw materials, and solves the problems of lead toxicity and instability in lead-based halide crystals. It is expected to be widely used in the fields of intelligent responsive luminescence, anti-counterfeiting, and temperature measurement. Attached Figure Description

[0037] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] Figure 1 The X-ray diffraction patterns of the samples from Examples 1 and 5 of this invention are shown below. Figure 1 In this context, 'a' represents RbCdCl3- at room temperature and RbCd... 93.91％ Mn 6.09％ The test spectrum of Cl3- at room temperature. Figure 1 In the middle, b is RbCdCl3-420 K, RbCd 93.91％ Mn 6.09％ The test spectrum of Cl3-420 K.

[0039] Figure 2 The fluorescence spectra of the samples from Examples 2-5 of this invention are shown below. Figure 2 In the middle, a is RbCd 99.65％ Mn 0.35％ Cl3-room temperature, RbCd 99.50％ Mn 0.50％ Cl3-room temperature, RbCd 98.84％ Mn 1.16％ Cl3- at room temperature and RbCd 93.91％ Mn 6.09％ Fluorescence spectrum of Cl3- at room temperature, Figure 2 b is RbCd 99.65％ Mn 0.35％ Cl3-420K, RbCd 99.50％ Mn0.50％ Cl3-420K, RbCd 98.84％ Mn 1.16％ Cl3-420K and RbCd 93.91％ Mn 6.09％ Fluorescence spectrum of Cl3-420K.

[0040] Figure 3 This is the CIE chromaticity coordinate diagram of the sample in Example 5 of the present invention.

[0041] Figure 4 The fluorescence temperature-varying emission spectrum of the sample in Example 5 of this invention is shown below. Figure 4 In the middle, a is RbCd 93.91％ Mn 6.09％ The room-temperature fluorescence emission spectrum of Cl3- Figure 4 b is RbCd 93.91％ Mn 6.09％ Fluorescence temperature-dependent emission spectrum of Cl3 at 420K.

[0042] Figure 5 This is a diagram showing the reversible effect of red light emission and yellow light emission achieved by the sample in Example 5 of the present invention under ultraviolet irradiation. Detailed Implementation

[0043] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0044] Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available products or can be prepared by known methods.

[0045] Example 1

[0046] 0.3628 g of rubidium chloride and 2.7498 g of cadmium chloride were dissolved in 15 mL of concentrated hydrochloric acid. The solution was then placed in a 50 mL high-pressure reactor lined with polytetrafluoroethylene. The reactor was placed in an oven at 380 K for hydrothermal reaction and kept at this temperature for 2 h. Afterward, the solution was allowed to cool naturally to room temperature, filtered, washed, and dried in an oven at 30 °C for 6 h to obtain colorless needle-like crystals of RbCdCl3.

[0047] The crystal structure of the sample in Example 1 without heating, i.e., the sample at room temperature, is denoted as RbCdCl3-room temperature. The powder X-ray diffraction pattern is shown below. Figure 1 According to single-crystal diffraction tests, RbCdCl3- at room temperature belongs to the orthorhombic crystal system with space group Pnma.

[0048] When the sample from Example 1 was heated to 420K to test its crystal structure, the sample was designated RbCdCl3-420K. Single-crystal diffraction testing was performed, and the powder X-ray diffraction pattern is shown below. Figure 1 In the equation b, RbCdCl3-420K is a tetragonal crystal system with space group P4 / mbm, indicating that RbCdCl3 exhibits different crystal structures at room temperature and 420K.

[0049] When irradiated with ultraviolet light and observed, RbCdCl3- did not exhibit fluorescence at room temperature or at 420K.

[0050] Example 2

[0051] 0.3628 g of rubidium chloride, 2.4748 g of cadmium chloride, and 0.2969 g of manganese chloride tetrahydrate were dissolved in 15 mL of concentrated hydrochloric acid. The solution was then placed in a 50 mL high-pressure reactor lined with polytetrafluoroethylene (PTFE). The reactor was placed in an oven at 380 K for hydrothermal reaction and held at this temperature for 2 hours. Afterward, the solution was allowed to cool naturally to room temperature, filtered, washed, and dried in an oven at 30 K for 6 hours to obtain colorless needle-like crystals. The chemical formula of these crystals was determined to be RbCd using XRD and ICP. 99.65％ Mn 0.35％ Cl3.

[0052] The crystal structures of the sample from Example 2 were tested separately after it was not heated (room temperature) and after it was heated (420K). The samples were denoted as RbCd. 99.65％ Mn 0.35％ Cl3- at room temperature and RbCd 99.65％ Mn 0.35％ Cl3-420K was found to have the same crystal structure as Example 1 under the same conditions, indicating that manganese doping did not affect its crystal structure.

[0053] Example 3

[0054] 0.3628 g of rubidium chloride, 2.1998 g of cadmium chloride, and 0.5937 g of manganese chloride tetrahydrate were dissolved in 15 mL of concentrated hydrochloric acid. The solution was then placed in a 50 mL high-pressure reactor lined with polytetrafluoroethylene (PTFE). The reactor was placed in a 380 K oven for hydrothermal reaction and held at this temperature for 2 hours. Afterward, the solution was allowed to cool naturally to room temperature, filtered, washed, and dried in a 30 °C oven for 6 hours to obtain colorless needle-like crystals. The chemical formula was determined to be RbCd using XRD and ICP methods. 99.50％ Mn 0.50％ Cl3.

[0055] The crystal structures of the sample from Example 3 were tested separately after it was not heated (room temperature) and after it was heated (420K). The sample was denoted as RbCd. 99.50％ Mn0.50％ Cl3- at room temperature and RbCd 99.50％ Mn 0.50％ Cl3-420K was found to have the same crystal structure as Example 1 under the same conditions, indicating that manganese doping did not affect its crystal structure.

[0056] Example 4

[0057] 0.3628 g of rubidium chloride, 1.3749 g of cadmium chloride, and 1.4843 g of manganese chloride tetrahydrate were dissolved in 15 mL of concentrated hydrochloric acid. The solution was then placed in a 50 mL high-pressure reactor lined with polytetrafluoroethylene (PTFE). The reactor was placed in a 380 K oven for hydrothermal reaction and held at this temperature for 2 hours. Afterward, the solution was allowed to cool naturally to room temperature, filtered, washed, and dried in a 30 °C oven for 6 hours to obtain colorless needle-like crystals. The chemical formula was determined to be RbCd using XRD and ICP methods. 98.84％ Mn 1.16％ Cl3.

[0058] The crystal structures of the sample from Example 4 were tested separately after it was not heated (room temperature) and after it was heated (420K). The sample was denoted as RbCd. 98.84％ Mn 1.16％ Cl3- at room temperature and RbCd 98.84％ Mn 1.16％ Cl3-420K was found to have the same crystal structure as Example 1 under the same conditions, indicating that manganese doping did not affect its crystal structure.

[0059] Example 5

[0060] 0.3628 g of rubidium chloride, 1.0999 g of cadmium chloride, and 1.7812 g of manganese chloride tetrahydrate were dissolved in 15 mL of concentrated hydrochloric acid. The solution was then placed in a 50 mL high-pressure reactor lined with polytetrafluoroethylene (PTFE). The reactor was placed in an oven at 380 K for hydrothermal reaction and kept at this temperature for 2 hours. Afterward, the solution was allowed to cool naturally to room temperature, filtered, washed, and dried in an oven at 30 K for 6 hours to obtain colorless needle-like crystals. The chemical formula of these crystals was determined to be RbCd using XRD and ICP methods. 93.91％ Mn 6.09％ Cl3.

[0061] The crystal structures of the sample from Example 5 were tested separately after being unheated (room temperature) and after being heated (420K), and the samples were denoted as RbCd. 93.91％ Mn 6.09％ Cl3- at room temperature and RbCd 93.91％ Mn 6.09％ Cl3-420K, results see [link / reference] Figure 1 The crystal structure was found to be consistent with that of Example 1 under the same conditions, indicating that manganese doping did not affect its crystal structure.

[0062] Comparative Example 1

[0063] 0.3628g of rubidium chloride, 0.8249g of cadmium chloride, and 2.0781g of manganese chloride tetrahydrate were dissolved in 15mL of concentrated hydrochloric acid. The solution was then placed in a 50mL high-pressure reactor lined with polytetrafluoroethylene. The reactor was placed in an oven at 380K for hydrothermal reaction and kept at this temperature for 2 hours. The solution was then allowed to cool naturally to room temperature, filtered, washed, and dried in an oven at 30℃ for 6 hours to obtain colorless needle-like crystals.

[0064] The crystal structure of the sample in Comparative Example 1, which was not heated (at room temperature), was inconsistent with the crystal structure of Example 1 under the same conditions.

[0065] The unheated sample (at room temperature) was irradiated with ultraviolet light and observed. No fluorescence was observed. The sample was heated to 420K and still showed no fluorescence, indicating that the sample of Comparative Example 1 does not have thermochromic properties.

[0066] Test Example 1

[0067] RbCd 99.65％ Mn 0.35％ Cl3-room temperature, RbCd 99.50％ Mn 0.50％ Cl3-room temperature, RbCd 98.84％ Mn 1.16％ Cl3- at room temperature and RbCd 93.91％ Mn 6.09％ Fluorescence spectroscopy of Cl3- was performed at room temperature with an ultraviolet excitation wavelength of 245 nm. The results are shown below. Figure 2 As shown in Figure a, under ultraviolet light excitation at a wavelength of 245 nm, each sample exhibits red fluorescence of varying intensities. The fluorescence intensity increases with increasing manganese doping. (RbCd) 93.91％ Mn 6.09％ The fluorescence intensity of Cl3- reaches its highest at room temperature.

[0068] RbCd 99.65％ Mn 0.35％ Cl3-420K, RbCd 99.50％ Mn 0.50％ Cl3-420K, RbCd 98.84％ Mn 1.16％ Cl3-420K and RbCd 93.91％ Mn 6.09％ Fluorescence spectroscopy was performed using Cl3-420K with an ultraviolet excitation wavelength of 278 nm. The results are shown below. Figure 2 From b, it can be seen that under ultraviolet light excitation at a wavelength of 278 nm, each sample exhibits yellow fluorescence of different intensities. The fluorescence intensity increases with the increase of manganese doping. (RbCd)99.65％ Mn 0.35％ The fluorescence quantum efficiency of Cl3-420K is 71.79%, and that of RbCd is... 93.91％ Mn 6.09％ The fluorescence intensity of Cl3-420K reaches its maximum, and its quantum efficiency can reach 100%.

[0069] Based on RbCd in Example 5 93.91％ Mn 6.09％ Cl3- at room temperature and RbCd 93.91％ Mn 6.09％ The fluorescence emission spectrum of Cl3-420K was plotted using a CIE diagram, and the results are shown below. Figure 3 From the chromaticity coordinate diagram, we know that RbCd 93.91％ Mn 6.09％ Cl3- emits red light at room temperature with chromaticity coordinates (0.609, 0.378). When the sample is heated to 420K, it emits yellow light with chromaticity coordinates (0.496, 0.450).

[0070] Test Example 3

[0071] RbCd from Example 5 were respectively 93.91％ Mn 6.09％ Cl3- at room temperature and RbCd 93.91％ Mn 6.09％ Temperature-dependent fluorescence emission spectroscopy was performed at 420K using Cl3. RbCd was also tested. 93.91％ Mn 6.09％ The fluorescence of Cl3- at room temperature was observed during the test at temperatures ranging from 160K to 480K. See the results below. Figure 4 From equation a, it can be seen that in the range of 160K-420K, the fluorescence intensity increases with increasing temperature; in the range of 420K-480K, the fluorescence intensity decreases with increasing temperature, reaching its maximum at 420K. (This is followed by an unrelated sentence about RbCd testing.) 93.91％ Mn 6.09％ The fluorescence of Cl3-420K was tested at temperatures ranging from 300K to 480K. See the results below. Figure 4 In the case of b, the fluorescence intensity decreases as the temperature increases.

[0072] Test Example 4

[0073] Figure 5 To prepare RbCd in Example 5 93.91％ Mn 6.09％ Images of Cl3- at room temperature and under 245 nm UV light irradiation at 420 K. The results showed that the RbCd prepared in Example 5... 93.91％ Mn 6.09％Cl3- emits red light at room temperature under 245nm UV light. When heated to 420K, it emits yellow light. When the sample temperature is lowered back to room temperature, it can still maintain yellow light emission after being stored in air for 12 hours. After that, it gradually returns to red light emission. If it is sealed and stored (in a non-vacuum environment), it can maintain yellow light emission for at least 2 days. This indicates that the sample of the present invention has obvious reversible thermochromic luminescence characteristics.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations and modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations and modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An application of a thermochromic luminescent material in temperature detection, characterized in that, The thermochromic luminescent material has the general chemical formula RbCd. (1-x) Mn x Cl3; x is the mole fraction, and its value ranges from 0 < x ≤ 15%.

2. The application according to claim 1, characterized in that, RbCd at room temperature (1-x) Mn x Cl3 belongs to the orthorhombic crystal system with space group Pnma. When RbCd (1-x) Mn x When Cl3 is heated to above 420 K, its crystal structure changes to a tetragonal system and its space group changes to P4 / mbm.

3. The application according to claim 1, characterized in that, At room temperature, when irradiated with an ultraviolet lamp, the thermochromic luminescent material emits red light; when heated to above 420 K, the thermochromic luminescent material emits yellow light.

4. The application according to claim 1, characterized in that, The value of x ranges from 5 to 7%.

5. A temperature detection device, characterized in that, Including thermochromic luminescent materials; The general chemical formula of the thermochromic luminescent material is RbCd. (1-x) Mn x Cl3; x is the mole fraction, and its value ranges from 0 < x ≤ 15%.

6. The temperature detection device according to claim 5, characterized in that, RbCd at room temperature (1-x) Mn x Cl3 belongs to the orthorhombic crystal system with space group Pnma. When RbCd (1-x) Mn x When Cl3 is heated to above 420 K, its crystal structure changes to a tetragonal system and its space group changes to P4 / mbm.

7. The temperature detection device according to claim 5, characterized in that, At room temperature, when irradiated with an ultraviolet lamp, the thermochromic luminescent material emits red light; when heated to above 420 K, the thermochromic luminescent material emits yellow light.

8. The temperature detection device according to claim 5, characterized in that, The value of x ranges from 5 to 7%.

Images