Application of (C7H7N2) 2PbBr4 fluorescent material

Abstract

The invention relates to the technical field of luminescent materials, and particularly discloses application of a (C7H7N2) 2PbBr4 fluorescent material. The invention also discloses application of the (C7H7N2) 2PbBr4 fluorescent material in pressure calibration. Through pressure engineering, the wide-range emission of the fluorescence of the (C7H7N2) 2PbBr4 fluorescent material from purple blue light to yellow green light can be effectively adjusted. The (C7H7N2) 2PbBr4 fluorescent material after pressure application has good optical properties, and has potential application values in the fields of pressure sensors, biological imaging, information storage and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of luminescent materials, and in particular to the application of (C7H7N2)2PbBr4 fluorescent materials. Background Art

[0002] In recent years, all-inorganic and organic-inorganic hybrid perovskite materials have attracted widespread attention in the field of optoelectronics, especially as luminescent materials. Among them, organic-inorganic hybrid perovskite materials are favored due to their simple synthesis, low cost, high luminescence efficiency, and adjustable color. (C7H7N2)2PbBr4 is a typical organic-inorganic hybrid perovskite material with excellent fluorescence properties. Its emission spectrum can be adjusted by changing the type of organic cations, halogen atoms, or doping metal ions, but the adjustment method is relatively complicated.

[0003] Therefore, it is necessary to provide the application of (C7H7N2)2PbBr4 fluorescent material, so as to simplify the method of adjusting the emission spectrum, improve the fluorescence efficiency and enhance the fluorescence stability. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention proposes the application of (C7H7N2)2PbBr4 fluorescent material, thereby simplifying the method of adjusting the emission spectrum, improving the fluorescence efficiency, and enhancing the fluorescence stability.

[0005] A first aspect of the present invention provides application of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0006] A second aspect of the present invention provides a method for applying a (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0007] Specifically, the following steps are included:

[0008] The (C7H7N2)2PbBr4 fluorescent material is placed in a sealed sample chamber of a high-pressure device, and pressure is applied to the anvil at room temperature to detect the fluorescence spectrum.

[0009] Preferably, the applied pressure is 0.43 to 10.27 GPa.

[0010] Preferably, the applied pressure is 0.43 GPa, 1.08 GPa, 1.69 GPa, 2.00 GPa, 2.53 GPa, 3.18 GPa, 3.93 GPa, 4.99 GPa, 6.98 GPa, 9.07 GPa, or 10.27 GPa.

[0011] Preferably, the high-pressure device also includes a gasket and silicone oil.

[0012] Preferably, the material of the gasket is T301 stainless steel.

[0013] Preferably, the silicone oil is dimethyl silicone oil. Dimethyl silicone oil is used as a pressure transmission medium to fully ensure that the pressure in the cavity is hydrostatic pressure.

[0014] Preferably, the anvil is a diamond anvil.

[0015] Preferably, the pressure calibration object of the applied pressure is a ruby ​​fluorescence peak. After the fluorescent material is placed in the sealed sample chamber of the high pressure device, a ruby ​​ball is placed in it, and the pressure in the sample chamber is calibrated using the ruby ​​fluorescence spectrum.

[0016] Preferably, the method for detecting fluorescence spectrum comprises the following steps:

[0017] The ruby ​​is excited by an excitation light source, and the signal is received from the anvil surface on the top anvil through the optical fiber connected to the spectrometer. The pressure value is calculated according to the fluorescence peak of the ruby, and then the excitation light beam is passed through (C7H7N2)2PbBr4 to record the fluorescence spectrum corresponding to the pressure value.

[0018] Further preferably, the excitation light source is a 355nm excitation light source.

[0019] A third aspect of the present invention provides application of (C7H7N2)2PbBr4 fluorescent material in the field of pressure sensors.

[0020] The fourth aspect of the present invention provides the application of (C7H7N2)2PbBr4 fluorescent material in the field of biological imaging.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The present invention can effectively adjust the fluorescence emission of (C7H7N2)2PbBr4 fluorescent material from purple-blue light to yellow-green light through pressure engineering. After applying pressure, the (C7H7N2)2PbBr4 fluorescent material has good optical properties and has potential application value in the fields of pressure sensors, biological imaging, information storage, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The fluorescence spectra of (C7H7N2)2PbBr4 fluorescent materials under the conditions of Example 2 and Comparative Example 1;

[0024] Figure 2 The fluorescence spectrum of (C7H7N2)2PbBr4 fluorescent material under the conditions of Example 2 and Example 3;

[0025] Figure 3This is the fluorescence spectrum of (C7H7N2)2PbBr4 fluorescent material under the conditions of Example 4;

[0026] Figure 4 This is a fluorescence photograph of the (C7H7N2)2PbBr4 fluorescent material under the conditions of Example 5;

[0027] Figure 5 This is the CIE chromaticity coordinate diagram of the (C7H7N2)2PbBr4 fluorescent material under the conditions of Example 5;

[0028] Figure 6 This is the CIE chromaticity coordinate color analysis diagram of the (C7H7N2)2PbBr4 fluorescent material under the conditions of Example 5. DETAILED DESCRIPTION

[0029] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0030] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0031] The synthesis of (C7H7N2)2PbBr4 fluorescent material is as follows: benzimidazole (47.7mg, 0.4mmol), PbBr2 (74.9mg, 0.2mmol) and 4mL HBr are heated to 80℃ for 2h, and the solid is completely dissolved. The solvent is then removed under nitrogen flow. The obtained yellow solid is washed with ethyl acetate. The yellow single crystal is obtained by evaporating the solvent at room temperature, which is the (C7H7N2)2PbBr4 fluorescent material.

[0032] Example 1

[0033] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0034] The (C7H7N2)2PbBr4 fluorescent material was placed in a sealed sample chamber of a diamond anvil (DAC) with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. A microporous sample chamber with a diameter of 150μm was obtained at the center of the pit using an electric spark puncher. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration used the standard ruby ​​fluorescence method. The diamond anvil pressurized the sample to 10.27GPa. In the in-situ high-pressure fluorescence experiment, a 10mW 355nm excitation beam was used to pass through the (C7H7N2)2PbBr4 fluorescent material. The optical fiber collected the fluorescence emitted by the anvil face and recorded the fluorescence spectrum corresponding to the pressure value.

[0035] Example 2

[0036] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0037] The (C7H7N2)2PbBr4 fluorescent material was placed in a sealed sample chamber of a diamond anvil (DAC) with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. A microporous sample chamber with a diameter of 150μm was obtained at the center of the pit using an electric spark puncher. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration used the standard ruby ​​fluorescence method. The diamond anvil gradually pressurized the sample to 1.08GPa. In the in-situ high-pressure fluorescence experiment, a 10mW 355nm excitation beam was used to pass through the (C7H7N2)2PbBr4 fluorescent material. The optical fiber collected the fluorescence emitted by the anvil face, and the fluorescence spectra at pressures of 0.43GPa and 1.08GPa were recorded.

[0038] Example 3

[0039] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0040] The (C7H7N2)2PbBr4 fluorescent material was placed in a sealed sample chamber of a diamond anvil (DAC) with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. An electric spark puncher was used to obtain a microporous sample chamber with a diameter of 150μm in the center of the pit. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration used the standard ruby ​​fluorescence method. The diamond anvil gradually pressurized the sample to 1.69GPa. In the in-situ high-pressure fluorescence experiment, a 10mW 355nm excitation beam was used to pass through the (C7H7N2)2PbBr4 fluorescent material. The optical fiber collected the fluorescence emitted by the anvil face and recorded the fluorescence spectrum at a pressure of 1.69GPa.

[0041] Example 4

[0042] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0043] The (C7H7N2)2PbBr4 fluorescent material was placed in a diamond anvil (DAC) sealed sample chamber with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. A microporous sample chamber with a diameter of 150μm was obtained at the center of the pit using an electric spark punch. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration adopted the standard ruby ​​fluorescence method. The diamond anvil gradually pressurized the sample to 10.27 GPa. The in situ high-pressure fluorescence experiment used a 10 mW 355 nm excitation beam to pass through the (C7H7N2)2PbBr4 fluorescent material. The optical fiber collected the fluorescence emitted by the anvil surface and recorded the fluorescence spectra at pressures of 1.69 GPa, 2.00 GPa, 2.53 GPa, 3.18 GPa, 3.93 GPa, 4.99 GPa, 6.98 GPa, 9.07 GPa, and 10.27 GPa.

[0044] Example 5

[0045] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0046] The (C7H7N2)2PbBr4 fluorescent material was placed in a diamond anvil (DAC) sealed sample chamber with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. An electric spark puncher was used to obtain a microporous sample chamber with a diameter of 150μm in the center of the pit. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration used the standard ruby ​​fluorescence method. The diamond anvil gradually pressurized the sample to 10.27GPa.

[0047] Fluorescence photographs at different pressure points were taken by a camera under a Nikon Ti-U microscope, and the fluorescence photographs were recorded at pressures of 0.43 GPa, 1.08 GPa, 1.69 GPa, 2.00 GPa, 2.53 GPa, 3.18 GPa, 3.93 GPa, 4.99 GPa, 6.98 GPa, 9.07 GPa, and 10.27 GPa.

[0048] The spectral data of the (C7H7N2)2PbBr4 fluorescent material measured under the spectrum were marked in the CIE chromaticity coordinate diagram through calculation, and the chromaticity coordinates were recorded at pressures of 0.43 GPa, 1.08 GPa, 1.69 GPa, 2.00 GPa, 2.53 GPa, 3.18 GPa, 3.93 GPa, 4.99 GPa, 6.98 GPa, 9.07 GPa, and 10.27 GPa.

[0049] Comparative Example 1

[0050] Application and method of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

[0051] The (C7H7N2)2PbBr4 fluorescent material was placed in a diamond anvil (DAC) sealed sample chamber with an anvil face diameter of 400μm. A T301 stainless steel gasket was selected and a 40μm thick pit was pre-pressed. A microporous sample chamber with a diameter of 150μm was obtained at the center of the pit using an electric spark punch. After the (C7H7N2)2PbBr4 fluorescent material was loaded into the sample chamber, dimethyl silicone oil was used as the pressure transmission medium, and then a ruby ​​ball was loaded to determine the actual pressure in the sample chamber. The pressure calibration used the standard ruby ​​fluorescence method. The diamond anvil gradually pressurized the sample to 1atm.

[0052] Fluorescence photos at different pressure points were taken by a camera under a Nikon Ti-U microscope, and the fluorescence photos were recorded when the pressure was 1 atm.

[0053] The spectral data of the (C7H7N2)2PbBr4 fluorescent material measured under the spectrum are marked in the CIE chromaticity coordinate diagram through calculation, and the chromaticity coordinates when the pressure is 1atm are recorded.

[0054] Depend on Figures 1 to 3 It can be seen that when the pressure ranges from 0.43 to 10.27 GPa, as the pressure increases, the luminescence peak gradually blue-shifts.

[0055] Depend on Figure 4 It can be seen that when the pressure ranges from 0.43 to 10.27 GPa, as the pressure increases, the fluorescence of the (C7H7N2)2PbBr4 fluorescent material emits a wide range of light from purple-blue to yellow-green.

[0056] Depend on Figure 5 It can be seen that the color change range and the corresponding trend can be clearly seen, and different pressure points can be clearly distinguished at each coordinate.

[0057] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution obtained by any modification, equivalent replacement, improvement, etc. made by a person skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection determined by the claims.

Claims

1. Application of (C7H7N2)2PbBr4 fluorescent material in pressure calibration.

2. The method of application according to claim 1, characterized in that: The following steps are involved: The (C7H7N2)2PbBr4 fluorescent material is placed in a sealed sample chamber of a high-pressure device, and pressure is applied to the anvil at room temperature to detect the fluorescence spectrum.

3. The method according to claim 2, characterized in that The applied pressure is 0.43 to 10.27 GPa.

4. The method according to claim 2, characterized in that: The high-pressure device also includes a gasket and silicone oil.

5. The method according to claim 4, characterized in that The material of the gasket is T301 stainless steel.

6. The method according to claim 4, characterized in that The silicone oil is dimethyl silicone oil.

7. The method according to claim 2, characterized in that The anvil is a diamond anvil.

8. The method according to claim 2, characterized in that: The method for detecting fluorescence spectrum comprises the following steps: The ruby ​​is excited by an excitation light source, and the signal is received from the anvil surface on the top anvil through the optical fiber connected to the spectrometer. The pressure value is calculated according to the fluorescence peak of the ruby, and then the excitation light beam is passed through (C7H7N2)2PbBr4 to record the fluorescence spectrum corresponding to the pressure value.

9. Application of (C7H7N2)2PbBr4 fluorescent material in the field of pressure sensors. 10.Application of (C7H7N2)2PbBr4 fluorescent material in biological imaging.

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