A rare earth organic polymer phosphorescent material and its preparation method and application

Abstract

The present invention provides a rare earth organic polymer phosphorescent material, a preparation method, and an application thereof. The inner layer of the material comprises scandium / leucine microspheres, and the outer layer comprises an inorganic salt coating. The present invention prepares an ultra-long-life rare earth organic polymer phosphorescent material by treating scandium / leucine microspheres with an inorganic salt solution. The material emits long-life room-temperature phosphorescence under ultraviolet excitation, enabling gram-scale quantitative production. Furthermore, by changing the type of inorganic salt, the phosphorescent properties of the luminescent material can be effectively adjusted. The present invention can be applied to micron-scale luminescent materials, overcoming the limitation of conventional room-temperature phosphorescent materials, which have limited application to the nanometer scale. It provides a powerful strategy for the large-scale, low-cost synthesis of ultra-long-life phosphorescent materials, and is expected to achieve in vivo biological imaging of cells.

Description

Technical Field

[0001] The present invention relates to the technical field of new materials, and in particular to a rare earth organic polymer phosphorescent material and a preparation method and application thereof. Background Art

[0002] Room temperature phosphorescent materials are a type of luminescent material that is excited by radiation at room temperature and releases energy to emit phosphorescence visible to the naked eye after the excitation stops. This type of room temperature phosphorescent material with long-lived excitons has attracted widespread attention due to its unique advantages in low background interference, enhanced signal-to-noise ratio, and long-lived emission, and has good application prospects in biosensing, information encryption, cell imaging, light-emitting diodes (LEDs), etc. However, because the triplet excitons of room temperature phosphorescent materials are sensitive to various factors (such as humidity, ambient oxygen, and rigid matrix), it is still challenging to construct room temperature phosphorescent materials with high phosphorescence quantum yield and long microsecond lifetime. To solve the above problems, people are now committed to improving the phosphorescence quantum efficiency and extending the phosphorescence lifetime of the material through molecular design or structural confinement strategies. However, such strategies still have shortcomings. The matrix is ​​often limited to the small size of the luminescent material, the preparation process is complex, and the experimental conditions are limited.

[0003] Rare earth room temperature phosphorescent organic polymer materials are an emerging class of room temperature phosphorescent materials, composed of rare earth metals and specific coordination polymers. Rare earth room temperature phosphorescent organic polymer materials have good prospects in many practical applications of room temperature phosphorescent materials. However, the existing processes have shortcomings such as complex preparation process, material size limited to the nanoscale, and low phosphorescence emission efficiency. Therefore, there is an urgent need for a rare earth room temperature phosphorescent organic polymer material with simple preparation and long life. Summary of the Invention

[0004] The purpose of the present invention is to provide a rare earth organic polymer phosphorescent material with micron size, high operability and long life. The material not only achieves long-life phosphorescence and has the ability to be produced at gram levels, but also has a simple preparation method and high operability.

[0005] The second object of the present invention is to provide a method for preparing rare earth organic polymer phosphorescent materials.

[0006] The third object of the present invention is to provide applications of rare earth organic polymer phosphorescent materials.

[0007] In order to achieve the first object mentioned above, the present invention provides a rare earth organic polymer phosphorescent material, wherein the inner layer of the material is scandium / leucine microspheres and the outer layer is an inorganic salt coating layer.

[0008] As a preferred embodiment, the inorganic salt is a metal sulfate.

[0009] As a further preferred embodiment, the metal sulfate includes sulfate of potassium, calcium, sodium, magnesium, aluminum, zinc, iron, copper or manganese. By changing the type of inorganic salt, the phosphorescent properties of the luminescent material can be effectively adjusted.

[0010] As a preferred embodiment, the material is prepared by the following method:

[0011] (1) Preparation of scandium / leucine microspheres: Scandium nitrate and leucine powder were dissolved in water, and scandium / leucine microspheres were prepared by a one-pot hydrothermal method at high temperature. The microspheres were then washed and dried.

[0012] (2) Preparation of inorganic salt @ scandium / leucine microspheres: dissolving the scandium / leucine microsphere powder obtained in step (1) in a metal sulfate solution and drying the solution to obtain an inorganic salt-treated rare earth organic polymer phosphorescent material.

[0013] In order to achieve the second object of the present invention, the present invention provides a method for preparing a rare earth organic polymer phosphorescent material, comprising the following steps:

[0014] (1) Preparation of scandium / leucine microspheres: Scandium nitrate and leucine powder were dissolved in water, and scandium / leucine microspheres were prepared by a one-pot hydrothermal method at high temperature. The microspheres were then washed and dried.

[0015] (2) Preparation of inorganic salt @ scandium / leucine microspheres: dissolving the scandium / leucine microsphere powder obtained in step (1) in a metal sulfate solution and drying the solution to obtain an inorganic salt-treated rare earth organic polymer phosphorescent material.

[0016] As a preferred embodiment, the hydrothermal temperature used in the one-pot hydrothermal method in step (1) is 160-260° C., and the hydrothermal time is 1-7 h.

[0017] As a preferred embodiment, the molar ratio of scandium nitrate to leucine powder in step (1) is (0.80-2.10):1, or preferably (0.90-1.06):1.

[0018] As a preferred embodiment, the metal sulfate in step (2) includes sulfate of potassium, calcium, sodium, magnesium, aluminum, zinc, iron, copper or manganese.

[0019] To achieve the third objective of the present invention, the present invention provides the use of a rare earth organic polymer phosphorescent material in the manufacture of information encryption products, anti-counterfeiting products, and optoelectronic devices. The ultra-long-life rare earth organic polymer phosphorescent material is irradiated with ultraviolet excitation light. Upon cessation of excitation, the rare earth organic polymer phosphorescent material emits long-life room-temperature phosphorescence.

[0020] The advantages of the present invention are that the inorganic salt@scandium / leucine microspheres provided herein can emit long-lived room-temperature phosphorescence, effectively adjusting the phosphorescent properties of the luminescent material by varying the type of inorganic salt. The inorganic salt thermal crystallization method used in the present invention has a simple operational process, a low professional threshold, high reproducibility, and can be prepared on a gram-scale scale. It can be applied to micron-sized luminescent materials, overcoming the limitation of conventional room-temperature phosphorescent materials, which are limited to the nanoscale, and providing a powerful strategy for the large-scale, low-cost synthesis of ultra-long-lifetime phosphorescent materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a diagram showing the anti-counterfeiting effect of the scandium / leucine microspheres prepared in Example 6 under ultraviolet light excitation and an LED lamp prepared based on the material Al2(SO4)3@Sc / Leu-MSs prepared in Example 6.

[0022] Figure 2 1 is the phosphorescence emission spectra of Sc / Leu-MSs with different substance ratios prepared in Example 7.

[0023] Figure 3 The luminescence of Sc / Leu-MSs, K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, and Al2(SO4)3@Sc / Leu-MSs prepared in Examples 1 to 6 respectively during and after ultraviolet light irradiation.

[0024] Figure 4 The phosphorescence lifetime change data of Sc / Leu-MSs, K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, and Al2(SO4)3@Sc / Leu-MSs under different excitations were prepared in Examples 1 to 6 respectively.

[0025] Figure 5 These are the mass change data of the inorganic salt @ scandium / leucine microspheres (K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, Al2(SO4)3@Sc / Leu-MSs) prepared in Examples 1 to 6 after being treated with inorganic salt solution and heated for recrystallization.

[0026] Figure 6This is a scanning electron micrograph of the scandium / leucine microspheres (Sc / Leu-MSs) of Example 1.

[0027] Figure 7 These are scanning electron microscope images of the ultra-long rare earth organic polymer phosphorescent materials (K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, Al2(SO4)3@Sc / Leu-MSs) prepared in Examples 1 to 6 respectively.

[0028] Figure 8 This is the three-dimensional phosphorescence spectrum of Sc / Leu-MSs in Example 1.

[0029] Figure 9 These are the three-dimensional phosphorescence spectra of K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, and Al2(SO4)3@Sc / Leu-MSs prepared in Examples 1 to 6, respectively. DETAILED DESCRIPTION

[0030] The technology of the present invention is described in detail below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only intended to help those skilled in the art understand the present invention, and are not intended to limit the present invention.

[0031] Example 1

[0032] (1) Preparation of scandium / leucine microspheres

[0033] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0034] (2) Preparation of potassium sulfate@scandium / leucine microspheres

[0035] 40 mg of Sc / Leu-MSs were dissolved in a K2SO4 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C to obtain a treated potassium sulfate@scandium / leucine microsphere (K2SO4@Sc / Leu-MSs) powder for further use.

[0036] Example 2

[0037] (1) Preparation of scandium / leucine microspheres

[0038] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0039] (2) Preparation of calcium sulfate@scandium / leucine microspheres

[0040] 40 mg of Sc / Leu-MSs were dissolved in a CaSO4 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C to obtain treated calcium sulfate@scandium / leucine microspheres (CaSO4@Sc / Leu-MSs) powder for further use.

[0041] Example 3

[0042] (1) Preparation of scandium / leucine microspheres

[0043] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0044] (2) Preparation of sodium sulfate@scandium / leucine microspheres

[0045] 40 mg of Sc / Leu-MSs were dissolved in 1.5 mmol of Na2SO4 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C to obtain the treated sodium sulfate@scandium / leucine microspheres (Na2SO4@Sc / Leu-MSs) powder for further use.

[0046] Example 4

[0047] (1) Preparation of scandium / leucine microspheres

[0048] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0049] (2) Preparation of magnesium sulfate@scandium / leucine microspheres

[0050] 40 mg of Sc / Leu-MSs were dissolved in a MgSO4 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C to obtain treated magnesium sulfate@scandium / leucine microspheres (MgSO4@Sc / Leu-MSs) powder for further use.

[0051] Example 5

[0052] (1) Preparation of scandium / leucine microspheres

[0053] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0054] (2) Preparation of zinc sulfate@scandium / leucine microspheres

[0055] 40 mg of Sc / Leu-MSs were dissolved in a ZnSO4 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C to obtain treated zinc sulfate@scandium / leucine microspheres (ZnSO4@Sc / Leu-MSs) powder for further use.

[0056] Example 6

[0057] (1) Preparation of scandium / leucine microspheres

[0058] 1.5 mmol of Sc(NO₃)₃·6H₂O and 1.5 mmol of Leu ligand were dissolved in 5.0 mL of ultrapure water. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powder for further use.

[0059] (2) Preparation of aluminum sulfate@scandium / leucine microspheres

[0060] 40 mg of Sc / Leu-MSs were dissolved in an Al2(SO4)3 salt solution by ultrasound. The water was then evaporated in a vacuum oven at 90°C, yielding a treated aluminum sulfate@scandium / leucine microsphere (Al2(SO4)3@Sc / Leu-MSs) powder for further use.

[0061] (3) Preparation of anti-counterfeiting patterns

[0062] The scandium / leucine microsphere powder is used as raw material and other fluorescent powders (Eu microcrystals, Tb microcrystals) are used to construct an anti-counterfeiting pattern. The shape of the anti-counterfeiting pattern changes after the excitation light source is removed by taking advantage of the presence or absence of phosphorescence, thereby achieving the anti-counterfeiting function. The results are as follows Figure 1 As shown in (a).

[0063] The scandium / leucine microsphere powder is ultrasonically dispersed in water to obtain a suspension as a luminescent ink for drawing anti-counterfeiting patterns. The different luminescence characteristics before and after ultraviolet excitation are used to make the color of the anti-counterfeiting pattern change after the excitation light source is removed, thereby achieving the anti-counterfeiting function. The results are as follows Figure 1 (b). Therefore, Figure 1 It can be seen that the prepared scandium / leucine microsphere powder can be used for anti-counterfeiting.

[0064] (4) Preparation of LED lamps

[0065] Using the aluminum sulfate@scandium / leucine microsphere powder as raw material, a DUV-LED lamp was prepared. When the driving current increased from 20mA to 120mA, the chromaticity coordinates, color rendering index, and color purity of the DUV-LED changed only slightly, while the emission intensity gradually increased. This demonstrates that the prepared material has great potential in the development of new DUV-LEDs. The results are shown in Figure 2. Figure 1 Therefore, from Figure 1 It can be seen that the inorganic salt@scandium / leucine microsphere powder prepared by the inorganic salt thermal crystallization strategy can be used in the field of optoelectronic devices.

[0066] Example 7

[0067] In this example, scandium / leucine microspheres with different molar ratios were prepared. The specific process was as follows:

[0068] Sc(NO₃)₃·6H₂O and Leu ligands were dissolved in 5.0 mL of ultrapure water at molar ratios of 0.80, 0.90, 1.00, 1.06, 1.20, and 2.10:1, respectively. The mixed solution was then transferred to a 25 mL Teflon-lined stainless steel autoclave and heated to 200°C for 300 minutes. The resulting product was washed and centrifuged five times at 3000 rpm for 2 minutes each, then dried in a vacuum oven to obtain scandium / leucine microspheres (Sc / Leu-MSs) powders with varying molar ratios for further use.

[0069] Test example

[0070] This experiment compares the luminescence properties of scandium / leucine microspheres with different molar ratios. All phosphorescence performance tests were performed on an Edinburgh FLS1000 steady-state transient fluorescence spectrometer. The specific process is as follows:

[0071] The phosphorescence emission spectra of scandium / leucine microspheres with different molar ratios (n(Sc:Leu)-0.80, 0.90, 1.00, 1.06, 1.20, 2.10:1) are shown in Figure 2. Figure 2 As shown. Figure 2 It can be seen that when the molar ratio of scandium nitrate to leucine is within the range of (0.80-2.10), the scandium / leucine microspheres can emit cyan phosphorescence; and when the molar ratio of scandium nitrate to leucine is within the range of (0.90-1.06), the scandium / leucine microspheres can exhibit dual emission characteristics, that is, under the same excitation, they can simultaneously emit cyan and red phosphorescence. From the above series of data, it can be seen that when the molar ratio of scandium nitrate to leucine is within the range of (0.80-2.10), the scandium / leucine microspheres have good luminescence properties and can be used as raw materials for subsequent inorganic salt thermal crystallization treatment.

[0072] This test example tests the performance of scandium / leucine microspheres and scandium / leucine microspheres treated with inorganic salts. The specific process is as follows:

[0073] The photos of scandium / leucine microspheres (Sc / Leu-MSs) and inorganic salt-treated scandium / leucine microspheres (K2SO4@Sc / Leu-MSs, CaSO4@Sc / Leu-MSs, Na2SO4@Sc / Leu-MSs, MgSO4@Sc / Leu-MSs, ZnSO4@Sc / Leu-MSs, Al2(SO4)3@Sc / Leu-MSs) during and after UV light irradiation are shown in Figure 2. Figure 3 shown.

[0074] from Figure 3 、 Figure 4 and Figure 5 It can be seen that inorganic salt treatment of scandium / leucine microspheres can produce ultra-long room-temperature phosphorescence properties. In room temperature air, the phosphorescence lifetime can be increased by up to 4.42 times, from 208.37ms (Sc / Leu-MSs) to 920.08ms (Al2(SO4)3@Sc / Leu-MSs). Furthermore, the luminescence quality of the scandium / leucine microspheres is significantly improved after inorganic salt treatment, from 40mg (Sc / Leu-MSs) to 1.0864g (Al2(SO4)3@Sc / Leu-MSs), a 27.16-fold increase.

[0075] Depend on Figure 3 、 Figure 4 and Figure 5 It can be seen that by utilizing the advantages of ultra-long phosphorescence lifetime and gram-scale production of the prepared material, the prepared ultra-long rare earth organic polymer phosphorescent material can be applied to anti-counterfeiting, information encryption, functional inks, optoelectronic devices and other fields.

[0076] The structure and performance tests of the ultra-long rare earth organic polymer phosphorescent materials prepared in Examples 1 to 6 were conducted, mainly to investigate the structural changes and phosphorescent performance changes of the target materials. All phosphorescent performance tests were conducted on an Edinburgh FLS1000 steady-state transient fluorescence spectrometer. The results are shown in the figure below. Figures 6-9 As shown in .

[0077] Figure 6 、 Figure 7 The scanning electron microscope images of the room temperature phosphorescent materials prepared in Examples 1 to 6 are shown in FIG. Figure 6 It can be seen that the prepared scandium / leucine microspheres are a quasi-microsphere structure with a rough surface. Figure 7 It can be seen that the inorganic salt-treated scandium / leucine microspheres prepared in Examples 1-6 differ significantly in their structure, depending on the type of inorganic salt used. However, they can be roughly divided into two categories: one that does not alter the microsphere structure but merely forms a coating on the surface; the other that not only forms a coating but also destroys the microsphere structure. This result further demonstrates that by varying the type of inorganic salt, the morphology of ultra-long rare earth organic polymer phosphorescent materials can be manipulated using an inorganic salt recrystallization strategy, thereby adjusting their luminescence properties.

[0078] Figure 8 、 Figure 9 The three-dimensional phosphorescence spectra of the room temperature phosphorescent materials prepared in Examples 1 to 6. Figure 8 It can be seen that the scandium / leucine microspheres are a room temperature phosphorescent material with cyan and red dual emission. Figure 9 It can be seen that the different types of inorganic salts used in the inorganic salt-treated scandium / leucine microspheres prepared in Examples 1 to 6 result in significantly different phosphorescent properties. However, these properties can be roughly divided into two categories: one in which the luminescence emission peak of the microspheres is not changed, but only the phosphorescence performance of the microspheres is improved, that is, the luminescence intensity and lifetime are both improved to a certain extent; the other in which the dual emission peak of the material is converted into a single cyan emission peak, which greatly improves the phosphorescence lifetime and intensity. The lifetime can be increased by up to 4.42 times, and the intensity can even be increased by 24.08 times. This result further demonstrates that the phosphorescence properties of ultra-long rare earth organic polymer phosphorescent materials can be regulated by changing the type of inorganic salt and utilizing the inorganic salt recrystallization strategy.

[0079] In summary, in the embodiment of the present invention, scandium / leucine microspheres are prepared by a hydrothermal method, and the organic room temperature phosphorescent material prepared by the inorganic salt heating recrystallization strategy can emit high-quality, long-life, and high-efficiency phosphorescence in room temperature air. And by changing the type of inorganic salt, the phosphorescence emission life and efficiency and other properties of the rare earth organic room temperature phosphorescent material can be regulated. At the same time, the unique ultra-long rare earth organic polymer phosphorescent material prepared can also be effectively used in information encryption, anti-counterfeiting inks, and optoelectronic devices. It can be seen that the inorganic salt thermal crystallization strategy has the advantages of simple operation process, low professional threshold, and high reproducibility. At the same time, since the long-life luminescent material prepared by this method has the characteristics of long life, high quality, and adjustable luminescent properties, it provides a powerful strategy for large-scale, low-cost synthesis of ultra-long rare earth organic polymer phosphorescent materials for application in data encryption, functional inks and other fields.

[0080] The above description is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rare earth organic polymer phosphorescent material, characterized in that: The inner layer of the material is scandium / leucine microspheres formed by coordination polymerization of scandium nitrate and leucine at high temperature through a one-pot hydrothermal method, and the outer layer is an inorganic salt coating layer. The inorganic salt is a metal sulfate, and the metal sulfate is selected from the sulfates of metal potassium, calcium, sodium, magnesium, aluminum, zinc or manganese.

2. The rare earth organic polymer phosphorescent material according to claim 1, characterized in that: The material is prepared by the following method: (1) Preparation of scandium / leucine microspheres: Scandium nitrate and leucine powder were dissolved in water, and scandium / leucine microspheres were prepared by a one-pot hydrothermal method at high temperature. The microspheres were then washed and dried. (2) Preparation of inorganic salt @ scandium / leucine microspheres: The scandium / leucine microsphere powder obtained in step (1) is dissolved in a metal sulfate solution and dried to obtain an inorganic salt-treated rare earth organic polymer phosphorescent material.

3. The method for preparing the rare earth organic polymer phosphorescent material according to claim 1, characterized in that: The following steps are involved: (1) Preparation of scandium / leucine microspheres: Scandium nitrate and leucine powder were dissolved in water, and scandium / leucine microspheres were prepared by a one-pot hydrothermal method at high temperature. The microspheres were then washed and dried. (2) Preparation of inorganic salt @ scandium / leucine microspheres: The scandium / leucine microsphere powder obtained in step (1) is dissolved in a metal sulfate solution and dried to obtain an inorganic salt-treated rare earth organic polymer phosphorescent material.

4. The method for preparing the rare earth organic polymer phosphorescent material according to claim 3, characterized in that: The hydrothermal temperature used in the one-pot hydrothermal method in step (1) is 160-260°C, and the hydrothermal time is 1-7 h.

5. The method for preparing the rare earth organic polymer phosphorescent material according to claim 3, characterized in that: The molar ratio of scandium nitrate to leucine powder in step (1) is (0.8-2.1):

1.

6. Use of the rare earth organic polymer phosphorescent material according to claim 1 in manufacturing information encryption products, anti-counterfeiting products and optoelectronic device products.

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