Stimuli-responsive single-doped uvc-red dual-band emission material and preparation method and application thereof

Abstract

The application provides a kind of stimulation response single-doped UVC-red light dual-band emission inorganic rare earth luminescent material and its preparation method and application, preparation method includes steps: (1) Na2CO3, Sr2CO3, SiO2 and Pr2O3 are mixed according to proportion to obtain raw material mixed powder;(2) the raw material mixed powder is placed in calcining equipment and is calcined to obtain calcined material;(3) the calcined material is ground to obtain the material Na2Sr 1‑x Ba x Si2O6:y%Pr 3+ , x=0~0.35, y=0.25~2;In addition, the stimulation response single-doped UVC-red light dual-band emission material of the application can also be applied to bright-dark field imaging.The application only dopes single luminescent center in a suitable single matrix, on the one hand, reduces the negative influence of multiple doping centers on the matrix itself, makes the material properties more stable and excellent, on the other hand, also simplifies the raw materials and steps required for material preparation, adapts to the needs of industrial mass production.

Description

Technical Field

[0001] This invention relates to the field of inorganic luminescent materials technology, specifically to a stimulus-responsive single-doped UVC-red dual-band emitting material, its preparation method, and its application. Background Technology

[0002] The rapid development of the information age has placed higher demands on functional materials, which are the cornerstone of information technology. Achieving the leap from single-function to multi-function coupling has become one of the main directions of modern high-tech material development. Most of the reported rare-earth-based luminescent materials are limited to single-mode optical response or light output, which is not conducive to exploring new application directions. In contrast, multi-mode luminescent materials can achieve multiple optical responses and emission modes, and are expected to become a good way to achieve multi-functional applications.

[0003] Currently, the emission regions of multimodal luminescent materials are limited to the visible and infrared light bands. This means that the emission signal must be observed in a dark environment to avoid strong interference from ambient light. Furthermore, increasing multifunctionality often requires co-doping strategies to introduce more luminescent ions, thus increasing the cost and complexity of material design and synthesis. Therefore, achieving multimodal emission characteristics in both bright and dark fields remains a challenge for single-doped phosphors. Summary of the Invention

[0004] This invention provides a stimulus-responsive single-doped UVC-red dual-band emitting material, its preparation method, and its application, in order to solve the above-mentioned problems.

[0005] The present invention discloses a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na₂Sr 1-x Ba x Si2O6:y%Pr 3+ , x=0~0.35, y=0.25~2.

[0006] The present invention discloses a method for preparing a stimulus-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0007] Step (1): Prepare raw materials, including Na2CO3, Sr2CO3, SiO2 and Pr2O3. Mix Na2CO3, Sr2CO3, SiO2 and Pr2O3 in proportion, put them into a mortar, pour alcohol into the mortar, and then grind and mix the raw materials to obtain raw material mixed powder.

[0008] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 800-1200℃ for 2-4 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0009] Step (3): Place the calcined material into a mortar and grind it to 150-250 μm to obtain the stimulus-responsive single-doped UVC-red dual-band emitting material.

[0010] As a further preferred option of the above scheme:

[0011] In step (i), Na2CO3, Sr2CO3 and SiO2 are mixed in a molar ratio of 1:1:2.

[0012] As a further preferred option of the above scheme:

[0013] In step (i), the proportion of Pr2O3 is 0.25% to 2% of the total molar ratio of the raw material mixture powder.

[0014] As a further preferred option of the above scheme:

[0015] In step (i), the raw materials also include Ba2CO3. Na2CO3, Ba2CO3, Sr2CO3, SiO2 and Pr2O3 are mixed in a certain proportion, wherein Na2CO3, Ba2CO3, Sr2CO3 and SiO2 are mixed in a molar ratio of 1:x:1-x:2, and the proportion of Pr2O3 accounts for 0.25% to 2% of the total molar ratio of the raw material mixture powder.

[0016] As a further preferred option of the above scheme:

[0017] The proportion of Pr2O3 is 1.5% of the total molar ratio of the raw material mixture powder.

[0018] The present invention relates to the application of a stimulus-responsive single-doped UVC-red dual-band emitting material, which is used in bright and dark field imaging.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The stimulus-responsive single-doped UVC-red dual-band emitting material of the present invention is Pr 3+ Single-ion doped materials, which are doped with only a single luminescent center in a suitable single matrix, reduce the potential negative impact of multiple doping centers on the matrix itself, making the material properties more stable and superior. On the other hand, they also simplify the raw materials and steps required for material preparation, meeting the needs of large-scale industrial production.

[0021] 2. The luminescent material prepared by the method of this invention can emit light in both UVC and red bands under X-ray excitation, making it an extremely rare UVC-red dual-emission material. Furthermore, this material integrates the unique properties of long afterglow and photochromism of UVC / red light, making it a multimodal luminescent material that meets the requirements of modern high-tech material development. This material provides a new approach for multifunctional optical storage and bright / dark field imaging applications.

[0022] 3. Currently, UVC materials are extremely scarce. Due to the significant energy difference between UVC and red light emission, high-energy excitation sources like X-rays are often used to simultaneously achieve both emission. This invention innovatively proposes a material capable of emitting both UVC and red light under ultraviolet excitation. This invention utilizes a common 254nm ultraviolet light source to simultaneously excite both UVC and red light emission, greatly reducing the difficulty and cost of obtaining the required excitation source. Furthermore, this invention uses Na2CO3, Sr2CO3, SiO2, and Pr2O3 as raw materials to prepare stimulus-responsive single-doped UVC-red dual-band emission materials. These raw materials are widely available and inexpensive. The operating environment is mild, requiring no special gas atmosphere, and the operation is simple, making it suitable for large-scale industrial production. The stimulus-responsive single-doped UVC-red dual-band emission material prepared using the aforementioned raw material ratio exhibits better luminescence intensity, effectively doping emission centers, high luminescence intensity, and a wide color-changing range. It also allows the material to emit light of different wavelengths at different temperatures while maintaining luminescence intensity. No harmful substances are generated during the preparation process.

[0023] 4. The stimulus-responsive single-doped UVC-red dual-band emitting material of the present invention can emit red light normally in the dark field, while in the bright field, due to the atmospheric barrier to UVC, the UVC emitted by the material can be collected and monitored with "zero noise", which solves the current problem of imaging of inorganic rare earth luminescent materials under sunlight and further expands its application in the field of anti-counterfeiting.

[0024] 5. The stimulus-responsive single-doped UVC-red dual-band emitting material of the present invention has the following chemical formula: Na₂Sr 1-x Ba x Si2O6:y%Pr 3+ Specifically:

[0025] (1) Na₂SrSi₂O₆ is used as the matrix because: Na₂SrSi₂O₆ is prepared from Na₂CO₃, Sr₂CO₃, and SiO₂. This matrix is ​​a cyclic silicate with the following unit cell parameters: and Composed of a folded hexagonal ring [Si6O 18 ] 12-The matrix consists of six to nine oxygen ligands for coordination between alkali metal and alkaline earth metal atoms. When such a matrix is ​​doped with rare earth elements, the oxygen vacancies and Ca in the crystal structure... 2+ The presence of cation vacancies creates inherent defects, making the matrix structure more prone to forming new crystal structures with rare earth elements compared to other matrices.

[0026] (2) Furthermore, the present invention designs a method of doping rare earth element Pr in a Na2SrSi2O6 matrix. 3+ Because Pr 3+ It possesses a very unique 5d energy level among rare earth ions, which allows it to satisfy the large Stokes shift required for UVC emission when used as a light-emitting center. Meanwhile, Pr... 3+ It also has 3 P0 to 1 The red light 4f-4f transition of D2, and most of the bad emissions in this transition are quenched at room temperature, Pr 3+ Excellent red light emission became possible, and Pr 3+ After entering the crystal, it will occupy Ca 2+ The charge difference between the two sites creates defects in the crystal structure, providing vacancies for electrons to enter and enabling the sustained emission of red light and UVC.

[0027] (3) Furthermore, the present invention also incorporates rare earth element Pr doping. 3+ Alloying a matrix with Ba2CO3 yields a stimulus-responsive single-doped UVC-red dual-band emitting material, enhancing the emission intensity in the red band. This is achieved by using Ba... 2+ Small amount of Sr replaced in the host matrix 2+ Weakening the bond strength in the crystal reduces the material's ΔE, which in turn makes nonradiative transitions in UVC emission more likely. This reduced UVC emission probability, in turn, increases the likelihood of red light emission, thus enhancing red light emission. This allows for precise control of the emission intensity in both wavelength bands, making the Na₂Sr material of this invention... 1-x Ba x Si2O6:y%Pr 3+ The light emission is more flexible and can follow the Ba 3+ The changes in the content can be used to regulate the changes in the luminescence intensity of the material in two wavelength bands, making the material more controllable. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 X-ray diffraction pattern of the material prepared in Example 4 of the invention;

[0030] Figure 2 SEM-EDX image of the material prepared in Example 4 of this invention;

[0031] Figure 3 XPS full spectrum and O, Sr, Si and Na spectra of the material prepared in Example 4 of this invention;

[0032] Figure 4 The emission spectrum of the material prepared in Example 4 of this invention under 245nm light excitation;

[0033] Figure 5 The 3D emission spectrum of the material prepared in Example 4 of this invention is shown in the 235nm-255nm range.

[0034] Figure 6 The X-ray diffraction patterns are those of the materials prepared in Examples 1, 2, 3, 4 and 5 of this invention.

[0035] Figure 7 The emission spectrum of the material prepared in Example 4 of this invention under 245 nm excitation;

[0036] Figure 8 The afterglow decay curves of the material prepared in Example 4 of the present invention at 270 nm under different X-ray radiation intensities;

[0037] Figure 9 The afterglow decay curve at 608 nm for the material prepared in Example 4 of this invention under X-ray excitation;

[0038] Figure 10 The emission spectrum of the material prepared in Example 4 of this invention under X-rays;

[0039] Figure 11 The thermal emission spectrum of the material prepared in Example 4 of this invention at 300°C under X-ray energy;

[0040] Figure 12 X-ray diffraction patterns of the materials prepared in Examples 12-16 of the present invention;

[0041] Figure 13 The emission spectra of the materials prepared in Examples 12-16 of this invention under 245nm light excitation;

[0042] Figure 14 The emission spectra of the materials prepared in Examples 12-16 of this invention under X-ray excitation;

[0043] Figure 15The material prepared in Example 14 of this invention was arranged into a leaf pattern. After being charged under X-rays for 10 minutes, thermal emission and afterglow photos were taken with a regular camera in dark field, and afterglow photos were taken with a UV camera. Then, the material was photographed with light emission under 245nm excitation with a regular camera (dark field) and a UV camera (bright field). Detailed Implementation

[0044] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] The stimulus-responsive single-doped UVC-red dual-band emitting material prepared in this invention has the chemical formula: Na₂Sr 1-x Ba x Si2O6:y%Pr 3+ Where x = 0–0.35 and y = 0.25–2. The stimulus-responsive single-doped UVC-red dual-band emitting material prepared in this invention can be applied to bright and dark field imaging, solving the problem that inorganic rare-earth doped materials can only be used for imaging in dark environments.

[0046] Example 1

[0047] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 0.25, this embodiment 1 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0048] Step (1)

[0049] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 0.25% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0029g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 35 minutes to obtain a mixed powder.

[0050] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0051] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0052] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 0.25.

[0053] Example 2

[0054] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 0.5, this embodiment 2 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0055] Step (1)

[0056] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 0.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0058g of Pr₂O₃ were weighed and placed into an agate mortar. The selected agate mortar had an inner diameter of 110mm and an agate mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 38 minutes to obtain a raw material mixture powder.

[0057] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0058] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0059] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 0.5.

[0060] Example 3

[0061] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1, this embodiment 3 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0062] Step (1)

[0063] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0115g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 40 minutes to obtain a mixed powder.

[0064] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0065] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0066] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.

[0067] Example 4

[0068] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 4 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0069] Step (1)

[0070] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 42 minutes to obtain a mixed powder.

[0071] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0072] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0073] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0074] Example 5

[0075] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 2, this embodiment 5 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0076] Step (1)

[0077] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 2% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0230g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 44 minutes to obtain a mixed powder.

[0078] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0079] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0080] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 2.

[0081] Example 6

[0082] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+Given x = 0 and y = 1.5, this embodiment 6 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0083] Step (1)

[0084] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 46 minutes to obtain a mixed powder.

[0085] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0086] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 800℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0087] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0088] Example 7

[0089] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba xSi2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 7 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0090] Step (1)

[0091] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 48 minutes to obtain a mixed powder.

[0092] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0093] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1200℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0094] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0095] Example 8

[0096] The material provided in this embodiment has the chemical formula Na2Sr.1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 8 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0097] Step (1)

[0098] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 50 minutes to obtain a mixed powder.

[0099] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0100] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 2 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0101] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0102] Example 9

[0103] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 9 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0104] Step (1)

[0105] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 52 minutes to obtain a mixed powder.

[0106] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0107] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 4 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0108] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0109] Example 10

[0110] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 10 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0111] Step (1)

[0112] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 54 minutes to obtain a mixed powder.

[0113] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0114] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0115] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 150 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0, y = 1.5.

[0116] Example 11

[0117] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0 and y = 1.5, this embodiment 11 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0118] Step (1)

[0119] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0:1:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7418g of Na₂CO₃, 0g of Ba₂CO₃, 1.0332g of Sr₂CO₃, 0.8410g of SiO₂, and 0.0173g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 56 minutes to obtain a mixed powder.

[0120] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0121] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0122] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 250 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr3+ x = 0, y = 1.5.

[0123] Example 12

[0124] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.05 and y = 1.5, this embodiment 12 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0125] Step (1)

[0126] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.05:0.95:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7354g of Na₂CO₃, 0.0685g of Ba₂CO₃, 0.9731g of Sr₂CO₃, 0.8338g of SiO₂, and 0.0172g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 58 minutes to obtain a mixed powder.

[0127] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0128] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0129] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr1-x Ba x Si2O6:y%Pr 3+ x = 0.05, y = 1.5.

[0130] Example 13

[0131] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.1 and y = 1.5, this embodiment 13 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0132] Step (1)

[0133] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.1:0.9:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7291g of Na₂CO₃, 0.1357g of Ba₂CO₃, 0.9140g of Sr₂CO₃, 0.8267g of SiO₂, and 0.0170g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 60 minutes to obtain a mixed powder.

[0134] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0135] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0136] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.1, y = 1.5.

[0137] Example 14

[0138] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.15 and y = 1.5, this embodiment 14 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0139] Step (1)

[0140] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.15:0.85:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7229g of Na₂CO₃, 0.2019g of Ba₂CO₃, 0.8559g of Sr₂CO₃, 0.8199g of SiO₂, and 0.0172g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 58 minutes to obtain a mixed powder.

[0141] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0142] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0143] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.15, y = 1.5.

[0144] Example 15

[0145] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.2 and y = 1.5, this embodiment 15 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0146] Step (1)

[0147] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.2:0.8:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7169g of Na₂CO₃, 0.2669g of Ba₂CO₃, 0.7988g of Sr₂CO₃, 0.8128g of SiO₂, and 0.0167g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 56 minutes to obtain a mixed powder.

[0148] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0149] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0150] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.2, y = 1.5.

[0151] Example 16

[0152] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.25 and y = 1.5, this embodiment 16 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0153] Step (1)

[0154] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.25:0.75:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7109g of Na₂CO₃, 0.3309g of Ba₂CO₃, 0.7426g of Sr₂CO₃, 0.8060g of SiO₂, and 0.0166g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 54 minutes to obtain a mixed powder.

[0155] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0156] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0157] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.25, y = 1.5.

[0158] Example 17

[0159] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+ Given x = 0.3 and y = 1.5, this embodiment 17 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0160] Step (1)

[0161] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.3:0.7:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.7050g of Na₂CO₃, 0.3938g of Ba₂CO₃, 0.6874g of Sr₂CO₃, 0.7993g of SiO₂, and 0.0165g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 52 minutes to obtain a mixed powder.

[0162] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0163] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0164] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.3, y = 1.5.

[0165] Example 18

[0166] The material provided in this embodiment has the chemical formula Na2Sr. 1-x Ba x Si2O6:y%Pr 3+Given x = 0.35 and y = 1.5, this embodiment 18 provides a method for preparing an excitation-responsive single-doped UVC-red dual-band emitting material, comprising the following steps:

[0167] Step (1)

[0168] Na₂CO₃, Ba₂CO₃, Sr₂CO₃, and SiO₂ were mixed in a molar ratio of 1:0.35:0.65:2 to obtain a mixture. Then, Pr₂O₃ was added to the mixture, with the proportion of Pr₂O₃ being 1.5% of the total molar ratio. In this embodiment, 0.6992g of Na₂CO₃, 0.4556g of Ba₂CO₃, 0.6330g of Sr₂CO₃, 0.7928g of SiO₂, and 0.0163g of Pr₂O₃ were weighed and placed into an agate mortar with an inner diameter of 110mm and a mortar rod length of 80mm. 10ml of AR99.7 alcohol was poured into the agate mortar. The raw materials were then ground and mixed for 50 minutes to obtain a mixed powder.

[0169] In this embodiment, adding 10 ml of AR99.7 alcohol to the raw material mixture before mixing makes the raw material mixture more uniform, which facilitates the interaction between the raw material powders and results in a material with higher luminescence intensity. The agate mortar has high compressive strength and is resistant to acids and alkalis, enabling it to grind various raw materials. Furthermore, no mortar material is mixed into the ground material after grinding, thus preventing the inclusion of other impurities during the grinding process, which could affect the final stimulus-responsive dual-emission-center color-changing luminescent material. In addition, by limiting the grinding time of the raw materials, each material can be ground to the required particle size, while ensuring thorough and uniform mixing.

[0170] Step (2): Place the raw material mixed powder in a calcining device for calcination at a temperature of 1000℃ for 3 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use.

[0171] Step (III): The calcined material is placed in an agate mortar for grinding. The agate mortar used in this step is the same as that used in Step (I). The calcined material is ground to 200 μm to obtain a stimulus-responsive single-doped UVC-red dual-band emitting material with the chemical formula: Na2Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0.35, y = 1.5.

[0172] Example 19

[0173] See Figure 15, based on Example 14, in this Example 19, an application of a stimulus-responsive single-doped UVC-red light dual-band emission material is provided. The material Na2Sr 1-x Ba x Si2O6:y%Pr 3+ prepared in Example 4 is evenly spread on a hollow iron plate, and the iron sheet is removed to obtain a mixed powder of raw materials in the shape of a leaf pattern and the words "Jiangnan" for imaging applications. The stimulus-responsive single-doped UVC-red light dual-band emission material in this Example is arranged in a leaf pattern, and after being energized under X-rays for 10 minutes, thermoluminescence and afterglow photos are taken with an ordinary camera in a dark field, afterglow photos are taken with a UV camera, and then photos of the material's luminescence are taken with an ordinary camera (dark field) and a UV camera (bright field) under excitation with a 245 nm light. The results are as Figure 15 shown, indicating that the material has good imaging ability in both bright and dark fields.

[0174] Comparative analysis

[0175] Experiment 1: The stimulus-responsive single-doped UVC-red light dual-band emission materials obtained in Examples 1-5 were analyzed using an X-ray diffractometer. The results are as Figure 1 and Figure 6 shown. It can be seen from the figure that the diffraction pattern of the material Na2SrSi2O6:x%Pr 3+ (x = 0.25 - 2) is almost identical to the corresponding standard diffraction pattern (PDF#01-074-3938), indicating that at these temperatures and ratios, the introduction of Pr 3+ does not cause the formation of new phases, confirming the successful synthesis of the Na2SrSi2O6:x%Pr 3+ (x = 0.25 - 2) solid solution. <0000�27>

[0176] Experiment 3: The stimulus-responsive single-doped UVC-red light dual-band emission material prepared in Example 4 above was tested by SEM-EDX and XPS to obtain Figure 2-3 , from which it can be seen that the target product was successfully synthesized.

[0177] Experiment 3: The stimulus-responsive single-doped UVC-red light dual-band emission material prepared in Example 4 above was excited with a 240 nm excitation source to obtain [[ID=३३]] Figure 4 , from which it can be seen that under excitation with 245 nm ultraviolet light, the overall emits red light and UVC light.

[0178] Experiment 4: The stimulus-responsive single-doped UVC-red light dual-band emission material prepared in Example 4 above was subjected to 3D emission spectrum testing from 235 nm to 255 nm. The results are as Figure 5As shown, it can be seen that the material is mainly excited in the wavelength range of 235-255nm and emits light in the range of 270-300nm.

[0179] Experiment 5: The stimulation-responsive single-doped UVC-red dual-band emitting materials prepared in Examples 1-5 above were subjected to spectral testing to obtain excitation and emission spectra. The results are as follows: Figure 7 As shown in the figure, Na2SrSi2O6:x%Pr 3+ (x=0.25-2) exhibits a consistent emission peak shape under 245nm excitation, with the emission intensity being highest at x=1.5, indicating that the Pr material... 3+ The light-emitting performance is optimal when the doping content is 1.5%.

[0180] Experiment 6: The stimulus-responsive single-doped UVC-red dual-band emitting material from Example 4 was charged for 10 min under X-rays of different radiation intensities. The afterglow decay curves of the material at 270 nm and 608 nm were tested, and the results are as follows: Figure 8-9 As shown, this demonstrates that the material exhibits good afterglow under X-ray energy.

[0181] Experiment 7: The emission spectrum of the stimulus-responsive single-doped UVC-red dual-band emitting material prepared in Example 4 above was tested under X-ray excitation, such as... Figure 10 As shown, emission peaks are observed at 270 nm and 608 nm.

[0182] Experiment 8: The stimulus-responsive single-doped UVC-red dual-band emitting material from Example 4 was charged under X-rays for 10 min, and the emission spectrum of the material at 300℃ was tested. The results are as follows: Figure 11 As shown, this illustrates that the material exhibits a red light emission path under X-ray energy.

[0183] Experiment 9: The stimulus-responsive single-doped UVC-red dual-band emitting materials obtained in Examples 12-16 were analyzed using X-ray diffraction. The results are as follows: Figure 12 As shown in the figure, the material Na2Sr 1-x Ba x Si2O6: 1.5% Pr 3+ The diffraction pattern (x = 0-0.35) is almost identical to the corresponding standard diffraction pattern (PDF#01-074-3938), indicating that at these temperatures and proportions, Ba... 3+ The alloying did not induce the formation of a new phase, confirming that Na2Sr 1-x Ba x Si2O6: 1.5% Pr 3+ (x=0-0.35) Successful synthesis of solid solutions.

[0184] Experiment 10: The stimulus-responsive single-doped UVC-red dual-band emitting material prepared in Examples 12-16 above was excited using a 245nm X-ray excitation source to obtain... Figure 13-14 Therefore, it can be seen that under 245nm ultraviolet light excitation, the overall emission is red and UVC light, with an increase in the intensity of the red light band. Under X-ray excitation, the intensity of the red light band also increases, and the ultraviolet emission shifts from UVC to UVB with increasing X, achieving UVC-UVB fluorescence modulation.

[0185] The present invention has been described in detail with reference to the foregoing embodiments. Those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stimulus-responsive single-doped UVC-red dual-band emitting material, characterized in that, The chemical structural formula is: Na₂Sr 1-x Ba x Si2O6:y%Pr 3+ x = 0~0.35, y = 0.25~2.

2. A method for preparing a stimulus-responsive single-doped UVC-red dual-band emitting material according to claim 1, comprising the following steps: Step (1): Prepare raw materials, including Na2CO3, Sr2CO3, SiO2, Pr2O3 and Ba2CO3. Mix Na2CO3, Ba2CO3, Sr2CO3, SiO2 and Pr2O3 in a certain proportion, wherein Na2CO3, Ba2CO3, Sr2CO3 and SiO2 are mixed in a molar ratio of 1:x:1-x:2, and the proportion of Pr2O3 accounts for 0.25% to 2% of the total molar ratio of the raw material mixture powder. Put them into a mortar and pour alcohol into the mortar. Then grind and mix the raw materials to obtain the raw material mixture powder. Step (2): Place the raw material powder mixture in a calcining device for calcination at a temperature of 800~1200℃ for 2~4 hours. After calcination, remove the material and cool it to room temperature to obtain the calcined product for later use. Step (3): Place the calcined material into a mortar and grind it to 150~250μm to obtain the stimulus-responsive single-doped UVC-red dual-band emitting material.

3. The method for preparing the stimulus-responsive single-doped UVC-red dual-band emitting material according to claim 2, characterized in that, In step (a), Na2CO3, Sr2CO3 and SiO2 are mixed in a molar ratio of 1:1:

2.

4. The method for preparing the stimulus-responsive single-doped UVC-red dual-band emitting material according to claim 2, characterized in that, The proportion of Pr2O3 is 1.5% of the total molar ratio of the raw material mixture powder.

5. The application of a stimulus-responsive single-doped UVC-red dual-band emitting material, characterized in that, The stimulus-responsive single-doped UVC-red dual-band emitting material of claim 1 is applied to bright and dark field imaging.

Images