Optical fiber image transmitting element for ultraviolet detection and preparation method and application thereof

Abstract

The invention provides an optical fiber image transmission element for ultraviolet detection and a preparation method and application thereof, and the preparation method comprises the steps: carrying out the pickling of the cross section of one end of the optical fiber image transmission element, enabling the cross section to form a microporous structure with the depth of 10-50 [mu] m, and obtaining a pickled optical fiber image transmission element; a fiber core of the optical fiber image transmission element is made of an easily acid-etching material, and a cladding is made of an acid-etching-resistant material; the preparation method comprises the following steps: dissolving CsX and PbX2 in an organic solvent to obtain a precursor solution; wherein X is at least one of Cl, Br and I; the precursor solution is heated, gas is introduced, the gaseous precursor solution is brought to the microporous structure, the precursor solution reacts at the microporous structure in a gaseous form to generate CsPbX3 quantum dots, the microporous structure is filled, and a filled optical fiber image transmitting element is obtained; and the protection window is arranged on the filling surface of the filling optical fiber image transmission element, so that the optical fiber image transmission element for ultraviolet detection is obtained, the optical fiber image transmission element has the advantages of high brightness and high resolution, and the efficiency and the resolution of an ultraviolet detector can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of ultraviolet detection technology, and in particular to an optical fiber image transmission element for ultraviolet detection and a preparation method and application thereof. Background Art

[0002] In modern photoelectric detection technology, ultraviolet radiation signals are generated by the corona phenomenon in outer space, flames, oil and high-voltage lines. Ultraviolet detection has a wide range of application needs in aviation, communications, civil detection and other fields. Therefore, ultraviolet detection has received more and more attention and has become another extremely important technology developed after laser detection technology.

[0003] Visible light detection technology based on charge-coupled devices (CCDs) is already very mature, and mass-produced CCDs have been applied to most industrial detection or civilian fields. Theoretically, CCDs have a certain response to light wavelengths of 0.1-1100nm, but the polysilicon electrodes of the detector itself have a strong absorption effect on light with a wavelength less than 400nm, which limits CCDs in ultraviolet detection.

[0004] Therefore, how to improve the detection efficiency and resolution of ultraviolet light by ultraviolet detectors is of great significance to national defense, civil use and scientific research fields. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical fiber imaging element for ultraviolet detection and its preparation method and application. The technical problem to be solved is how to improve the detection efficiency and detection resolution of ultraviolet light by the ultraviolet detector, so as to make it more suitable for practical use.

[0006] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. According to a method for preparing an optical fiber image transmission element for ultraviolet detection proposed by the present invention, the steps include:

[0007] (1) Acid-washing a cross section of one end of an optical fiber imaging element to form a microporous structure at the cross section, wherein the depth of the microporous structure is 10 to 50 μm, thereby obtaining an acid-washed optical fiber imaging element; wherein the core of the optical fiber imaging element is made of an acid-resistant material and the cladding is made of an acid-resistant material;

[0008] (2) dissolving CsX and PbX2 in an organic solvent to obtain a precursor solution; wherein X is at least one of Cl, Br and I;

[0009] (3) heating the aforementioned precursor solution and introducing an inert gas to bring the aforementioned precursor solution in a gaseous state to the aforementioned microporous structure, so that the aforementioned precursor solution reacts in the aforementioned microporous structure in a gaseous state to generate CsPbX3 quantum dots, which fill the aforementioned microporous structure to obtain a filled optical fiber imaging element; and,

[0010] (4) A protective window is installed on the filling surface of the aforementioned filled optical fiber imaging element to obtain an optical fiber imaging element for ultraviolet detection.

[0011] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0012] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (2), the molar ratio of CsX to PbX2 is 1:0.8-1.2.

[0013] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (2), the aforementioned organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide or N,N-dimethylacrylamide.

[0014] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (3), the temperature of heating the aforementioned precursor solution is 500-700°C.

[0015] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (3), the aforementioned gas introduced is at least one of argon and nitrogen.

[0016] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (4), the material of the aforementioned protective window is quartz, and the thickness is 2 to 3 mm.

[0017] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, the steps further include: before step (4), coating a silicon dioxide film layer on the filling surface of the aforementioned filled optical fiber imaging element.

[0018] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (4), the method for installing the aforementioned protective window is: dripping coupling glue on the aforementioned silica film layer, placing the aforementioned protective window, and then curing the aforementioned coupling glue.

[0019] The purpose of the present invention and the technical problem to be solved are also achieved by adopting the following technical solutions. According to the present invention, an optical fiber image transmission element for ultraviolet detection includes:

[0020] An optical fiber imaging element, wherein the core of the optical fiber imaging element is made of an acid-resistant material, the cladding is made of an acid-resistant material, the core of the optical fiber imaging element is concave at a cross section at one end, and a microporous structure with a depth of 10 to 50 μm is formed at the cross section;

[0021] CsPbX3 quantum dots, the aforementioned CsPbX3 quantum dots are filled in the aforementioned microporous structure; and,

[0022] A protective window, wherein the protective window is arranged on the cross section of the optical fiber imaging element filled with the CsPbX3 quantum dots.

[0023] The purpose of the present invention and the technical problems solved therein are also achieved by adopting the following technical solutions: According to the present invention, an application of the aforementioned optical fiber image transmission element for ultraviolet detection in the field of ultraviolet detection is proposed.

[0024] Through the above technical solution, the optical fiber image transmission element for ultraviolet detection and its preparation method and application of the present invention have at least the following advantages:

[0025] The preparation method of the optical fiber image transmission element for ultraviolet detection proposed by the present invention adopts an optical fiber image transmission element whose core is an acid-resistant material and whose cladding is an acid-resistant material, realizes a high-precision, high-uniform and regularly arranged microporous structure on the cross section of the optical fiber image transmission element based on the acid washing method, controls the depth of the microporous structure to be 10-50 μm, and fills the microporous structure with CsPbX3 quantum dots, wherein X is at least one of Cl, Br and I. CsPbX3 quantum dots have high photoluminescence quantum yield, excellent color purity and adjustable band gap, and control the filling thickness to be 10-50 μm, so that it acts as an ultraviolet light-sensitive material, which can achieve high luminous intensity and long-term stability, and improve detection efficiency and detection life. At the same time, after filling with CsPbX3 quantum dots, a single optical fiber can achieve efficient luminescence, effectively improving the detection resolution; the light converted by the quantum dot material in the microporous structure after ultraviolet irradiation is transmitted by the corresponding optical fiber, and each optical fiber is a separate image transmission unit. Compared with the diffuse reflection light of the stimulated emission of the traditional quantum dot material, the resolution is greatly improved. In addition, by combining Cl, Br, and I ions, CsPbX3 quantum dots that emit visible light of any wavelength can be prepared, and the combination can be selected according to the actual application scenario.

[0026] CsPbX3 quantum dots are produced by direct reaction at the microporous structure using a precursor solution containing CsX and PbX2 as raw materials by chemical vapor deposition. This method allows for rapid and dense filling of CsPbX3 quantum dots, high preparation efficiency, high purity of the generated CsPbX3 quantum dots, and good luminescence effect, which is conducive to industrial production.

[0027] The optical fiber image transmission element for ultraviolet detection prepared by the present invention has the advantages of high brightness and high resolution, effectively improves the detection efficiency and detection resolution of the ultraviolet detector, and is of great significance to the fields of national defense, civil use and scientific research.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of an optical fiber imaging element for ultraviolet detection disclosed in Example 1 of the present invention;

[0030] Figure 2 is a schematic structural diagram of an optical fiber imaging element for ultraviolet detection disclosed in Example 2 of the present invention;

[0031] Figure 3 is a schematic structural diagram of an optical fiber imaging element for ultraviolet detection disclosed in Example 3 of the present invention;

[0032] Figure 4 It is a fluorescence spectrum diagram of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in Example 1 of the present invention;

[0033] Figure 5 It is a fluorescence spectrum diagram of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in Example 2 of the present invention;

[0034] Figure 6 It is a fluorescence spectrum diagram of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in Example 3 of the present invention;

[0035] Figure 7 It is a fluorescence spectrum diagram of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in Example 4 of the present invention;

[0036] Figure 8 It is a fluorescence spectrum diagram of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in Example 5 of the present invention;

[0037] Fig. 9 It is a fluorescence spectrum diagram of the optical fiber imaging element for ultraviolet detection in Example 1 of the present invention and the P20 phosphor optical fiber imaging element in Comparative Example 2;

[0038] Fig.10 This is an X-ray diffraction test diagram of CsPbBr3 quantum dots in Example 1 of the present invention.

[0039] Description of reference numerals:

[0040] 1. Quartz window; 2. Epoxy resin glue; 3. CsPbBr3 quantum dots; 4. Acid-washed optical fiber panel; 5. Acid-washed optical fiber light cone; 6. Acid-washed optical fiber image inverter. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of an optical fiber image transmission element for ultraviolet detection and its preparation method and application according to the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0042] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0043] The present invention provides a method for preparing an optical fiber image transmission element for ultraviolet detection, such as Figures 1 to 3 As shown, the steps include:

[0044] (1) Acid-washing a cross section of one end of an optical fiber imaging element to form a microporous structure at the cross section, wherein the depth of the microporous structure is 10 to 50 μm, thereby obtaining an acid-washed optical fiber imaging element; wherein the core of the optical fiber imaging element is made of an acid-resistant material and the cladding is made of an acid-resistant material;

[0045] (2) dissolving CsX and PbX2 in an organic solvent to obtain a precursor solution; wherein X is at least one of Cl, Br and I;

[0046] (3) heating the aforementioned precursor solution and introducing an inert gas to bring the aforementioned precursor solution in a gaseous state to the aforementioned microporous structure, so that the aforementioned precursor solution reacts in the aforementioned microporous structure in a gaseous state to generate CsPbX3 quantum dots, which fill the aforementioned microporous structure to obtain a filled optical fiber imaging element; and,

[0047] (4) A protective window is installed on the filling surface of the aforementioned filled optical fiber imaging element to obtain an optical fiber imaging element for ultraviolet detection.

[0048] Specifically, in step (1), the optical fiber image transmission element may be a fiber panel, a fiber light cone or a fiber image invertor. Based on the acid resistance of the fiber core and the cladding, the acid solution used for pickling may be selected from at least one of 0.1-3.0 mol / L hydrochloric acid, nitric acid, citric acid and sulfuric acid. The pickling method can produce a regularly arranged microporous structure with holes only at the fiber core position. This method can accurately prepare micropores at the fiber core position without destroying the cladding structure to cause optical crosstalk. In addition, the diameter of the micropores is controlled by adjusting the fiber core diameter, and the depth of the micropores is controlled by adjusting the acid concentration and immersion time, so as to achieve a high-precision, highly uniform and regularly arranged micropore structure with adjustable micropore diameter and depth.

[0049] In step (2), CsPbX3 quantum dots have high photoluminescence quantum yield, excellent color purity and adjustable band gap. The filling thickness is controlled to be 10 to 50 μm, so that it acts as an ultraviolet light-sensitive material, which can achieve high luminescence intensity and long-term stability, and improve detection efficiency and detection life. At the same time, after filling CsPbX3 quantum dots, a single optical fiber can achieve efficient luminescence, effectively improving the detection resolution; the light converted by the quantum dot material in the microporous structure after ultraviolet irradiation is transmitted by the corresponding optical fiber, and each optical fiber is a separate image transmission unit. Compared with the diffuse reflection light of the stimulated emission of traditional quantum dot materials, the resolution is greatly improved. In addition, by combining the three ions of Cl, Br, and I, CsPbX3 quantum dots that emit visible light of any wavelength can be prepared, and the combination can be selected according to the actual application scenario. The concentration and mass of the precursor solution are adjusted according to the depth and diameter of the micropores. For example, 1-5 mol CsX and 1-5 mol PbX2 can be dissolved in 1-5 ml DMF in a molar ratio of 1:1 to prepare a precursor solution.

[0050] In step (3), CsPbX3 quantum dots are directly reacted and generated at the microporous structure using a precursor solution containing CsX and PbX2 as raw materials by chemical vapor deposition. For example, the precursor solution can be placed at the air inlet of a tube furnace, and the optical fiber imaging element with a microporous array is placed at the exhaust port. The gas flow rate is controlled at 80-120 mL / min, and the heating temperature of the tube furnace is controlled according to the composition of X. After the CsPbX3 quantum dots fill the microporous structure, the CsPbX3 quantum dots that are higher than the cross section of the panel are scraped off. This method allows CsPbX3 quantum dots to be filled quickly and densely, with high preparation efficiency. The generated CsPbX3 quantum dots have high purity and good luminescence effect, which is conducive to industrial production. The organic solvent can be selected to be an organic solvent that can dissolve CsX and PbX2 and is volatile and does not react with the optical fiber imaging element, and no specific restrictions are made here.

[0051] The protective window can protect the filled CsPbX3 quantum dots from being contaminated and falling off. The protective window can be made of transparent materials such as quartz, organic glass, resin, etc.

[0052] The optical fiber image transmission element for ultraviolet detection prepared by the method of the present invention has the advantages of high brightness and high resolution, which effectively improves the detection efficiency and detection resolution of the ultraviolet detector, and is of great significance to the fields of national defense, civil use and scientific research.

[0053] In some embodiments, in step (2), the molar ratio of CsX to PbX2 is 1:0.8-1.2.

[0054] Specifically, the ratio is determined by the chemical formula of CsPbX3. If the molar ratio of CsX to PbX2 is greater than 1:0.8 or less than 1:1.2, more by-products are produced in the generated CsPbX3 quantum dots. More preferably, the molar ratio of CsX to PbX2 is 1:1.

[0055] In some embodiments, in step (2), the aforementioned organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide or N,N-dimethylacrylamide.

[0056] Specifically, N,N-dimethylformamide (DMF) has excellent solubility: DMF is a polar solvent with good solubility properties. It can dissolve a variety of inorganic and organic substances and can dissolve CsX and PbX2 very well. DMF also has good chemical stability and is relatively stable at high temperatures. In addition, DMF has low viscosity and low surface tension, and its boiling point is only 153°C, which makes it easy to gasify. The physical and chemical properties of N,N-dimethylacetamide and N,N-dimethylacrylamide are similar to those of DMF.

[0057] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (3), the temperature of heating the aforementioned precursor solution is 500-700°C.

[0058] Specifically, when the temperature is lower than 500°C, the rate at which CsX and PbX2 react to form CsPbX3 quantum dots is slow; when the temperature is higher than 700°C, the evaporation rate of the precursor solution is too fast, difficult to control, and has high requirements on equipment. Therefore, the temperature of the aforementioned precursor solution is controlled at 500-700°C.

[0059] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (3), the aforementioned gas introduced is at least one of argon and nitrogen.

[0060] Specifically, argon and nitrogen are inert gases commonly used in industrial production.

[0061] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (4), the material of the aforementioned protective window is quartz, and the thickness is 2 to 3 mm.

[0062] Specifically, quartz has good light transmittance and has good hardness and wear resistance.

[0063] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, the steps further include: before step (4), coating a silicon dioxide film layer on the filling surface of the aforementioned filled optical fiber imaging element.

[0064] Specifically, the coating of the silicon dioxide film layer can better isolate water and oxygen and protect the CsPbX3 quantum dots. The thickness of the silicon dioxide film layer can be 2-5 μm.

[0065] In some embodiments, according to the aforementioned method for preparing an optical fiber imaging element for ultraviolet detection, in step (4), the method for installing the aforementioned protective window is: dripping coupling glue on the aforementioned silica film layer, placing the aforementioned protective window, and then curing the aforementioned coupling glue.

[0066] Specifically, the coupling glue can be epoxy resin glue 2. For example, use a syringe to drop 0.2-0.5 ml of epoxy resin glue 2 at the center of the silicon dioxide film layer, control the protection window to slowly drop vertically until it is in full contact with the silicon dioxide film layer, and the thickness of the epoxy resin glue 2 is 5-10 μm at this time, and then cure it at 60°C for 3-6 hours to achieve complete curing.

[0067] The present invention provides an optical fiber image transmission element for ultraviolet detection, which comprises:

[0068] An optical fiber imaging element, wherein the core of the optical fiber imaging element is made of an acid-resistant material, the cladding is made of an acid-resistant material, the core of the optical fiber imaging element is concave at a cross section at one end, and a microporous structure with a depth of 10 to 50 μm is formed at the cross section;

[0069] CsPbX3 quantum dots, the aforementioned CsPbX3 quantum dots are filled in the aforementioned microporous structure; and,

[0070] A protection window, wherein the protection window is arranged on the cross section of the optical fiber imaging element filled with the CsPbX3 quantum dots.

[0071] The present invention proposes an application of the aforementioned optical fiber image transmission element for ultraviolet detection in the field of ultraviolet detection. For example, the optical fiber image transmission element for ultraviolet detection proposed by the present invention can be installed on an ultraviolet detector for use.

[0072] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0073] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0074] In the following embodiments, the core of the optical fiber imaging element is made of an acid-etchable material. In terms of oxide molar percentage, the core components include: SiO2: 30.3-36.4%; B2O3: 18.9-20.2%; La2O3: 5.9-6.1%; the total content of BaO and CaO is: 33.7-39.4%; Al2O3: 1.6-2.3%; TiO2: 2.0-2.9%; the cladding of the optical fiber imaging element Acid-resistant materials are used, and the cladding components, calculated by molar percentage of oxides, include: SiO2: 70.5-74.5%; PbO: 12.0-12.5%; Bi2O3: 0-2.0%; the total content of Na2O, K2O, Rb2O and Cs2O is 5.8-7.7%; the total content of BaO and MgO is 4.6-6.7%; Al2O3: 1.1-3.0%; TiO2: 0-2.0%.

[0075] Embodiment 1:

[0076] This embodiment provides an optical fiber image transmission element for ultraviolet detection and a preparation method thereof. Figure 1 .

[0077] (1) The optical fiber image transmission element in this embodiment uses an optical fiber panel with a core diameter of 10 μm and a thickness of 10 mm. The cross section of the optical fiber panel is immersed in a nitric acid solution with a volume of 1 L and a concentration of 0.5 mol / L for 2 hours, so that a regularly arranged microporous structure with a micropore diameter of 10 μm and a depth of 10 μm is formed at the cross section of the optical fiber panel, thereby obtaining an acid-washed optical fiber panel 4.

[0078] (2) Dissolve 2 mol CsBr and 2 mol PbBr2 in 2 mol DMF to prepare a precursor solution.

[0079] (3) The precursor solution is placed at the air inlet of the tube furnace, and the pickled optical fiber panel 4 is placed at the exhaust port. The circulating gas is nitrogen, the gas flow rate is controlled at 100 mL / min, and the temperature of the tube furnace is 600°C. After the precursor solution is completely volatilized, it is observed that the microporous structure is completely filled. The CsPbBr3 quantum dots 3 that are higher than the panel cross section are scraped off to obtain a filled optical fiber panel.

[0080] (4) A 4 μm thick silica film layer is coated to isolate water and oxygen. 0.3 ml of epoxy resin glue 2 is dripped into the center of the silica film layer using a syringe. The 2 mm thick quartz window 1 is controlled to slowly descend vertically until it is in full contact with the silica film layer. At this time, the thickness of the epoxy resin glue 2 is 10 μm. Then, it is cured at 60°C for 5 hours to achieve complete curing, thereby obtaining an optical fiber imaging element for UV detection.

[0081] (5) The same precursor solution as in step (2) is placed at the air inlet of the tube furnace, and a quartz substrate with a thickness of 12 mm is placed at the exhaust port. The circulating gas is nitrogen, and the gas flow rate is controlled at 100 mL / min. The temperature of the tube furnace is 600°C, and a layer of 10 μm thick CsPbBr3 quantum dots 3 is deposited on the surface of the quartz substrate to obtain a quantum dot glass film quartz plate.

[0082] The prepared CsPbBr3 quantum dots 3 were subjected to X-ray diffraction test, and the results were as follows: Fig.10 As shown in the figure, it can be seen that the peaks of the PDF standard comparison card correspond one to one, proving that high-purity CsPbBr3 quantum dots 3 have been successfully synthesized.

[0083] The fluorescence spectra of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in this embodiment were tested using a fluorescence spectrometer. The test results are shown in Figure 2. Figure 4 As shown, A is the luminescence intensity curve of the quantum dot glass film quartz plate, and B is the luminescence intensity curve of the optical fiber imaging element for ultraviolet detection. The peak position of the quantum dot glass film quartz plate is at 530nm and the peak shape is sharp, and the relative luminescence intensity is 100%. The peak position of the optical fiber imaging element for ultraviolet detection is at 530nm and the peak shape is sharp, indicating that the luminescence purity of the sample is high; the relative luminescence intensity is 80%, and the luminescence intensity is only lost by 20%, indicating that the luminescence intensity of the sample is high. Using ultraviolet light as the light source to test the resolution of the optical fiber panel in this embodiment is 50.8lp / mm, and the resolution of the optical fiber imaging element for ultraviolet detection is 50.8lp / mm, indicating that there is no loss of resolution when filling quantum dots in the microporous structure.

[0084] Embodiment 2:

[0085] This embodiment provides an optical fiber image transmission element for ultraviolet detection, and its structural schematic diagram is shown in Figure 2 .

[0086] The difference between this embodiment and embodiment 1 is that the optical fiber image transmission element adopts an optical fiber light cone with a core diameter of 10 μm and a thickness of 10 mm. Furthermore, the pickled optical fiber panel 4 in embodiment 1 is an pickled optical fiber light cone 5 in this embodiment; the filled optical fiber panel in embodiment 1 is a filled optical fiber light cone in this embodiment.

[0087] The fluorescence spectra of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in this embodiment were tested using a fluorescence spectrometer. The test results are shown in Figure 2. Figure 5 As shown, A is the luminescence intensity curve of the quantum dot glass film quartz plate, and B is the luminescence intensity curve of the optical fiber imaging element for ultraviolet detection. The peak position of the quantum dot glass film quartz plate is at 530nm and the peak shape is sharp, and the relative luminescence intensity is 100%. The peak position of the optical fiber imaging element for ultraviolet detection is at 530nm and the peak shape is sharp, indicating that the luminescence purity of the sample is high; the relative luminescence intensity is 75%, and the luminescence intensity is only lost by 25%, indicating that the luminescence intensity of the sample is high. Using ultraviolet light as the light source to test the resolution of the optical fiber light cone in this embodiment is 50.8lp / mm, and the resolution of the optical fiber imaging element for ultraviolet detection is 50.8lp / mm, indicating that there is no loss of resolution when filling quantum dots in the microporous structure.

[0088] Embodiment 3:

[0089] This embodiment provides an optical fiber image transmission element for ultraviolet detection, and its structural schematic diagram is shown in Figure 3 .

[0090] The difference between this embodiment and embodiment 1 is that the optical fiber image transmission element adopts an optical fiber image inverter with a core diameter of 10 μm and a thickness of 10 mm. Furthermore, the acid-washed optical fiber panel 4 in embodiment 1 is an acid-washed optical fiber image inverter 6 in this embodiment; the filled optical fiber panel in embodiment 1 is a filled optical fiber image inverter in this embodiment.

[0091] The fluorescence spectra of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in this embodiment were tested using a fluorescence spectrometer. The test results are shown in Figure 2. Figure 6 As shown, A is the luminous intensity curve of the quantum dot glass film quartz plate, and B is the luminous intensity curve of the optical fiber imaging element for ultraviolet detection. The peak position of the quantum dot glass film quartz plate is at 530nm and the peak shape is sharp, and the relative luminous intensity is 100%. The peak position of the optical fiber imaging element for ultraviolet detection is at 530nm and the peak shape is sharp, indicating that the luminous purity of the sample is high; the relative luminous intensity is 62%, and the luminous intensity is only lost by 38%, indicating that the luminous intensity of the sample is high. Using ultraviolet light as the light source to test the resolution of the optical fiber image inverter in this embodiment is 50.8lp / mm, and the resolution of the optical fiber imaging element for ultraviolet detection is 50.8lp / mm, indicating that there is no loss of resolution when filling quantum dots in the microporous structure.

[0092] Embodiment 4:

[0093] This embodiment provides an optical fiber imaging element for ultraviolet detection and a method for preparing the same.

[0094] The difference between this embodiment and embodiment 1 is that in step (2), 2 mol CsCl and 2 mol PbCl2 are dissolved in 2 mol DMF to prepare a precursor solution; and in step (3), the temperature of the tube furnace is 700°C.

[0095] The fluorescence spectra of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in this embodiment were tested using a fluorescence spectrometer. The test results are shown in Figure 2. Figure 7 As shown, A is the luminous intensity curve of the quantum dot glass film quartz plate, and B is the luminous intensity curve of the optical fiber imaging element for ultraviolet detection. The peak position of the quantum dot glass film quartz plate is at 450nm and the peak shape is sharp, and the relative luminous intensity is 100%. The peak position of the optical fiber imaging element for ultraviolet detection is at 450nm and the peak shape is sharp, indicating that the luminous purity of the sample is high; the relative luminous intensity is 80.2%, and the luminous intensity is only lost by 19.8%, indicating that the luminous intensity of the sample is high. Using ultraviolet light as the light source to test the resolution of the optical fiber image inverter in this embodiment is 50.8lp / mm, and the resolution of the optical fiber imaging element for ultraviolet detection is 50.8lp / mm, indicating that there is no loss of resolution when filling the quantum dot glass powder in the microporous structure.

[0096] Embodiment 5:

[0097] This embodiment provides an optical fiber imaging element for ultraviolet detection and a method for preparing the same.

[0098] The difference between this embodiment and embodiment 1 is that in step (2), 2 mol CsI and 2 mol PbI2 are dissolved in 2 mol DMF to prepare a precursor solution; and in step (3), the temperature of the tube furnace is 500°C.

[0099] The fluorescence spectra of the quantum dot glass film quartz plate and the optical fiber imaging element for ultraviolet detection in this embodiment were tested using a fluorescence spectrometer. The test results are shown in Figure 2. Figure 8As shown, A is the luminous intensity curve of the quantum dot glass film quartz plate, and B is the luminous intensity curve of the optical fiber imaging element for ultraviolet detection. The peak position of the quantum dot glass film quartz plate is at 630nm and the peak shape is sharp, and the relative luminous intensity is 100%. The peak position of the optical fiber imaging element for ultraviolet detection is at 630nm and the peak shape is sharp, indicating that the luminous purity of the sample is high; the relative luminous intensity is 79.7%, and the luminous intensity is only lost by 20.3%, indicating that the luminous intensity of the sample is high. Using ultraviolet light as the light source to test the resolution of the optical fiber image inverter in this embodiment is 50.8lp / mm, and the resolution of the optical fiber imaging element for ultraviolet detection is 50.8lp / mm, indicating that there is no loss of resolution when filling the quantum dot glass powder in the microporous structure.

[0100] Comparative Example 1:

[0101] The optical fiber panel in Example 1 is used as a substrate, and a perovskite quantum dot glass film with a thickness of 10 μm is prepared on its surface to obtain a quantum dot glass film optical fiber imaging element. The specific method is: the perovskite quantum dot glass powder in Example 1 is dispersed in anhydrous ethanol to prepare a quantum dot dispersion liquid, 0.2 ml of the quantum dot dispersion liquid is dripped on the surface of the optical fiber panel, and the rotation speed is controlled to 800 rpm by spin coating, and the time is 60 seconds. After spin coating, it is heated in an oven at 60°C for 30 minutes to form a quantum dot glass film with a thickness of 10 μm on the surface of the substrate.

[0102] The resolution of the quantum dot glass film optical fiber imaging element was tested using ultraviolet light as the light source, and the result showed 45.3 lp / mm. Compared with the optical fiber imaging element for ultraviolet detection in Example 1, its resolution is lower, indicating that the perovskite quantum dot glass powder filled in the microporous structure of the optical fiber panel can effectively improve the resolution.

[0103] Comparative Example 2:

[0104] The difference between Comparative Example 2 and Example 1 is that the perovskite quantum dot glass powder is replaced with P20 phosphor to obtain a P20 phosphor optical fiber imaging element.

[0105] The fluorescence spectra of the ultraviolet detection optical fiber imaging element in Example 1 and the above-mentioned P20 phosphor optical fiber imaging element were tested using a fluorescence spectrometer. The test results are as follows: Fig. 9 As shown, B is the luminous intensity curve of the optical fiber imaging element for ultraviolet detection in Example 1, and C is the luminous intensity curve of the P20 phosphor optical fiber imaging element. Taking the luminous intensity of the optical fiber imaging element for ultraviolet detection in Example 1 as 100%, the luminous intensity of the P20 phosphor optical fiber imaging element is only 47%, indicating that its luminous intensity is low, and its half-peak width is large, indicating that its luminous purity is poor. The optical fiber imaging element provided by the present invention exhibits high luminous intensity and luminous purity, which can effectively improve the detection efficiency.

[0106] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0107] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an optical fiber imaging element for ultraviolet detection, characterized in that: The steps include: (1) Acid-washing a cross section of one end of an optical fiber imaging element to form a microporous structure at the cross section, wherein the depth of the microporous structure is 10 to 50 μm, thereby obtaining an acid-washed optical fiber imaging element; wherein the core of the optical fiber imaging element is made of an acid-resistant material and the cladding is made of an acid-resistant material; (2) dissolving CsX and PbX2 in an organic solvent to obtain a precursor solution; wherein X is at least one of Cl, Br and I; (3) heating the precursor solution and introducing an inert gas to bring the gaseous precursor solution to the microporous structure, so that the precursor solution reacts in the form of a gas at the microporous structure to generate CsPbX3 quantum dots, which fill the microporous structure to obtain a filled optical fiber imaging element; and, (4) A protective window is installed on the filling surface of the filled optical fiber imaging element to obtain an optical fiber imaging element for ultraviolet detection.

2. The preparation method according to claim 1, characterized in that: In step (2), The molar ratio of CsX to PbX2 is 1:0.8-1.

2.

3. The preparation method according to claim 1, characterized in that: In step (2), The organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide or N,N-dimethylacrylamide.

4. The preparation method according to claim 1, characterized in that: In step (3), The temperature of heating the precursor solution is 500-700°C.

5. The preparation method according to claim 1, characterized in that: In step (3), The gas introduced is at least one of argon and nitrogen.

6. The preparation method according to claim 1, characterized in that: In step (4), The material of the protection window is quartz, and the thickness is 2-3 mm.

7. The preparation method according to claim 1, characterized in that: The steps also include: before step (4), coating a silicon dioxide film layer on the filling surface of the filled optical fiber imaging element.

8. The preparation method according to claim 7, characterized in that: In step (4), the method for installing the protection window is: dripping coupling glue on the silicon dioxide film layer, placing the protection window, and then curing the coupling glue.

9. An optical fiber image transmission element for ultraviolet detection, characterized in that: It includes: An optical fiber imaging element, wherein the core of the optical fiber imaging element is made of an acid-resistant material, the cladding is made of an acid-resistant material, the core of the optical fiber imaging element is concave at a cross section at one end, and a microporous structure with a depth of 10 to 50 μm is formed at the cross section; CsPbX3 quantum dots, the CsPbX3 quantum dots are filled in the microporous structure; and, A protection window is provided on the cross section of the optical fiber imaging element filled with the CsPbX3 quantum dots.

10. Application of the optical fiber imaging element for ultraviolet detection according to claim 9 in the field of ultraviolet detection.

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