Optical fiber image transmitting element for X-ray detection and preparation method and application of optical fiber image transmitting element

Abstract

The invention provides an optical fiber image transmission element for X-ray detection and a preparation method and application thereof. The optical fiber image transmission element comprises an optical fiber image transmission element; the quantum dot glass layer is arranged at the image transmission end of the optical fiber image transmission element; the quantum dot glass layer adopts CsPbX3 quantum dot glass, and X is at least one of Cl, Br and I; in the CsPbX3 quantum dot glass, the surface of the CsPbX3 quantum dot is covered with a glass matrix. According to the optical fiber image transmitting element for X-ray detection, the surface of the CsPbX3 quantum dot is covered with the glass matrix, contact with water and oxygen is effectively avoided, the long-term stability of the quantum dot is improved, and the optical fiber image transmitting element has low detection lower limit and high sensitivity and is more practical.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray detection, and in particular to an optical fiber imaging element for X-ray detection, a preparation method thereof and an application thereof. Background Art

[0002] X-rays are a type of electromagnetic wave with a short wavelength ranging from 0.01nm to 10nm and an energy of 100eV to 10MeV. Based on the penetration, differential absorption, photosensitivity and fluorescence effects of X-rays, they can be widely used in environmental monitoring, geophysical detection, radiotherapy and medical diagnosis. Due to the rapid development of X-ray applications, higher demands have been placed on X-ray detection technology.

[0003] Currently, X-ray detectors mainly use CsI scintillator as the photosensitive material of the detection element, but the production cost of CsI scintillator is high, the process is complicated, and the stability is poor.

[0004] Therefore, how to provide an X-ray detection element with a simpler preparation process, lower cost and better stability is of great significance to the fields of national defense, civil use and scientific research. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical fiber imaging element for X-ray detection and its preparation method and application. The technical problem to be solved is how to provide an X-ray detection element with a simpler preparation process, lower cost and better stability, so as to be 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 the present invention, an optical fiber image transmission element for X-ray detection includes:

[0007] Fiber optic imaging element; and,

[0008] The quantum dot glass layer is arranged at one end of the optical fiber imaging element for transmitting images; the quantum dot glass layer is made of CsPbX3 quantum dot glass, where X is at least one of Cl, Br and I; in the CsPbX3 quantum dot glass, the surface of the CsPbX3 quantum dots is covered with a glass matrix.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] In some embodiments, according to the aforementioned optical fiber imaging element for X-ray detection, the components of the raw materials of the aforementioned CsPbX3 quantum dot glass include: SiO2: 30-40%; H3BO3: 20-30%; ZnO: 15-20%; Cs2CO3: 10-15%; PbX2: 5-10%; and, NaX: 5-10%.

[0011] In some embodiments, according to the aforementioned optical fiber imaging element for X-ray detection, the preparation method of the aforementioned CsPbX3 quantum dot glass comprises the following steps:

[0012] (1) preparing glass raw materials;

[0013] (2) melting the aforementioned glass raw materials to obtain a glass melt;

[0014] (3) pouring the aforementioned glass melt into a mold to obtain a precursor glass; and,

[0015] (4) The aforementioned precursor glass is annealed at 350-450° C. for 2-3 h to obtain the aforementioned CsPbX 3 quantum dot glass.

[0016] In some embodiments, according to the aforementioned optical fiber imaging element for X-ray detection, the thickness of the aforementioned quantum dot glass layer is 100-500 μm.

[0017] The purpose of the present invention and the technical problem solved by the present invention are also achieved by adopting the following technical solutions. According to a method for preparing an optical fiber image transmission element for X-ray detection proposed by the present invention, the method comprises the following steps:

[0018] Processing CsPbX3 quantum dot glass into a sheet to obtain sheet quantum dot glass;

[0019] Coupling glue is dripped at the center of the aforementioned sheet-like quantum dot glass, and the optical fiber imaging element is controlled to vertically descend until it is in full contact with the aforementioned sheet-like quantum dot glass, and then the coupling glue is solidified to prepare the aforementioned optical fiber imaging element for X-ray detection.

[0020] The purpose of the present invention and the technical problem solved by the present invention are also achieved by adopting the following technical solutions. According to a method for preparing an optical fiber image transmission element for X-ray detection proposed by the present invention, the method comprises the following steps:

[0021] Dispersing CsPbX3 quantum dots in an organic solvent to obtain a quantum dot solution; wherein X is at least one of Cl, Br and I;

[0022] Coating the aforementioned quantum dot solution on the surface of one end of the optical fiber imaging element for image transmission, drying, forming a quantum dot film, and obtaining a quantum dot optical fiber imaging element;

[0023] The end of the quantum dot optical fiber imaging element having the aforementioned quantum dot film is immersed in silica gel and allowed to stand for 4 to 5 days to form a silica layer on the surface of the aforementioned quantum dot optical fiber imaging element, and then polished to obtain the aforementioned optical fiber imaging element for X-ray detection.

[0024] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0025] In some embodiments, according to the aforementioned preparation method, the aforementioned method for preparing CsPbX3 quantum dots comprises the following steps:

[0026] PbX2 is dissolved in an organic solvent, and then oleylamine and oleic acid are added, and the mixture is reacted at 130-170°C in an inert gas atmosphere for 1-3 hours, and then cesium oleate solution is quickly injected, stirred evenly at 130-170°C, and then cooled in an ice water bath to generate the CsPbX3 quantum dots.

[0027] In some embodiments, according to the aforementioned preparation method, the aforementioned preparation method of cesium oleate solution comprises the following steps:

[0028] CsCO3 and oleic acid are mixed with an organic solvent and fully reacted at 130-170°C in an inert gas atmosphere to obtain the aforementioned cesium oleate solution.

[0029] In some embodiments, according to the aforementioned preparation method, the aforementioned preparation method of silica gel comprises the following steps:

[0030] Add silicon tetrachloride to the ethanol solution, stir thoroughly, then add hydrochloric acid and stir until there are no bubbles, to obtain the aforementioned silica gel.

[0031] The purpose of the present invention and the technical problems solved therein are also achieved by adopting the following technical solutions: The present invention proposes the application of any of the aforementioned optical fiber imaging elements for X-ray detection in the field of X-ray detection.

[0032] Through the above technical solution, the optical fiber image transmission element for X-ray detection and its preparation method and application of the present invention have at least the following advantages:

[0033] The optical fiber image transmission element for X-ray detection proposed by the present invention is provided with a quantum dot glass layer at one end of the optical fiber image transmission element for image transmission. By selecting CsPbX3 quantum dot glass as the quantum dot glass layer, wherein X is at least one of Cl, Br and I, a simple preparation process, low cost, low detection limit and high sensitivity X-ray detection element is provided. CsPbX3 quantum dots have high photoluminescence quantum yield, excellent color purity and adjustable band gap, so that they can act as photosensitive materials for absorbing X-rays, and can achieve high luminescence intensity and long-term stability, thereby improving detection sensitivity and detection life. At the same time, compared with the traditional CsI scintillator as a photosensitive material for X-ray detection, CsPbX3 quantum dot glass has a simpler preparation process and lower cost. In addition, by combining the three ions of Cl, Br and I, CsPbX3 quantum dots that can emit visible light of any wavelength can be prepared, and the combination can be selected according to the actual application scenario. In the quantum dot glass, the surface of the CsPbX3 quantum dots is covered with a glass matrix, which effectively avoids contact with water and oxygen and improves the long-term stability of the quantum dots.

[0034] 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

[0035] Figure 1 is a schematic structural diagram of an optical fiber imaging element for X-ray detection disclosed in Example 1 of the present invention;

[0036] Figure 2 is a schematic structural diagram of an optical fiber imaging element for X-ray detection disclosed in Example 2 of the present invention;

[0037] Figure 3 is a schematic structural diagram of an optical fiber imaging element for X-ray detection disclosed in Example 3 of the present invention;

[0038] Figure 4 is a radiation luminescence spectrum diagram of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection in Example 1 of the present invention;

[0039] Figure 5 is a radiation luminescence spectrum diagram of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection in Example 2 of the present invention;

[0040] Figure 6 is a radiation luminescence spectrum diagram of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection in Example 3 of the present invention;

[0041] Figure 7 is a radiation luminescence spectrum diagram of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection in Example 4 of the present invention;

[0042] Figure 8 is a radiation luminescence spectrum diagram of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection in Example 5 of the present invention;

[0043] Fig. 9 This is an X-ray diffraction test diagram of CsPbBr3 quantum dots in Example 1 of the present invention.

[0044] Description of reference numerals:

[0045] 1. Quantum dot glass layer; 2. Epoxy resin glue; 3. Fiber optic panel; 4. Fiber optic light cone; 5. Fiber optic image inverter. DETAILED DESCRIPTION

[0046] 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 X-ray detection and its preparation method and application according to the present invention, its specific implementation, structure, features 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.

[0047] 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.

[0048] The present invention provides an optical fiber imaging element for X-ray detection, which comprises:

[0049] Fiber optic imaging element; and,

[0050] Quantum dot glass layer 1, the aforementioned quantum dot glass layer 1 is arranged at one end of the aforementioned optical fiber imaging element for transmitting images; the aforementioned quantum dot glass layer 1 adopts CsPbX3 quantum dot glass, X is at least one of Cl, Br and I; in the aforementioned CsPbX3 quantum dot glass, the surface of CsPbX3 quantum dots is covered with a glass matrix.

[0051] Specifically, the optical fiber image transmission element can select an optical fiber panel 3, an optical fiber light cone 4 or an optical fiber image invertor 5, etc. CsPbX3 quantum dots have high photoluminescence quantum yield, excellent color purity and adjustable band gap, so that they can act as photosensitive materials for absorbing X-rays, achieve high luminous intensity and long-term stability, and improve detection sensitivity and detection life. In addition, by combining the three ions of Cl, Br, and I, CsPbX3 quantum dots that can emit visible light of any wavelength can be prepared, and the combination can be selected according to the actual application scenario. At the same time, compared with the traditional CsI scintillator used as a photosensitive material for X-ray detection, CsPbX3 quantum dot glass has a simpler preparation process and lower cost. In quantum dot glass, the surface of CsPbX3 quantum dots is covered with a glass matrix, which effectively avoids contact with water and oxygen and improves the long-term stability of quantum dots.

[0052] In some embodiments, the components of the raw materials of the aforementioned CsPbX3 quantum dot glass include: SiO2: 30-40%; H3BO3: 20-30%; ZnO: 15-20%; Cs2CO3: 10-15%; PbX2: 5-10%; and, NaX: 5-10%.

[0053] In some embodiments, the method for preparing the CsPbX3 quantum dot glass comprises the following steps:

[0054] (1) preparing glass raw materials;

[0055] (2) melting the aforementioned glass raw materials to obtain a glass melt;

[0056] (3) pouring the aforementioned glass melt into a mold to obtain a precursor glass; and,

[0057] (4) The aforementioned precursor glass is annealed at 350-450° C. for 2-3 h to obtain the aforementioned CsPbX 3 quantum dot glass.

[0058] Specifically, in the CsPbX3 quantum dot glass prepared by the method proposed in this embodiment, the outer ring of each perovskite grain is wrapped by an amorphous glass component, which effectively avoids contact with water and oxygen and improves the long-term stability of the quantum dots. By heating the precursor glass at 350-450°C for 2-3h to anneal, CsPbX3 can be induced to grow in situ in the glass matrix.

[0059] In some embodiments, the aforementioned quantum dot glass layer 1 has a thickness of 100-500 μm.

[0060] The purpose of the present invention and the technical problem solved by the present invention are also achieved by adopting the following technical solutions. According to a method for preparing an optical fiber image transmission element for X-ray detection proposed by the present invention, the method comprises the following steps:

[0061] Processing CsPbX3 quantum dot glass into a sheet to obtain sheet quantum dot glass;

[0062] Coupling glue is dripped at the center of the aforementioned sheet-like quantum dot glass, and the optical fiber imaging element is controlled to vertically descend until it is in full contact with the aforementioned sheet-like quantum dot glass, and then the coupling glue is solidified to prepare the aforementioned optical fiber imaging element for X-ray detection.

[0063] Specifically, the coupling glue can be epoxy resin glue 2. For example, 0.2-0.5 ml of epoxy resin glue 2 is dripped at the center of the sheet quantum dot glass using a syringe, and the protective window is controlled to slowly drop vertically until it is in full contact with the silicon dioxide film layer. At this time, the thickness of the epoxy resin glue 2 is 5-10 μm, and then it is cured at 60° C. for 3-6 hours to achieve complete curing.

[0064] The present invention provides a method for preparing an optical fiber image transmission element for X-ray detection, which comprises the following steps:

[0065] Dispersing CsPbX3 quantum dots in an organic solvent to obtain a quantum dot solution; wherein X is at least one of Cl, Br and I;

[0066] Coating the aforementioned quantum dot solution on the surface of one end of the optical fiber imaging element for image transmission, drying, forming a quantum dot film, and obtaining a quantum dot optical fiber imaging element;

[0067] The end of the quantum dot optical fiber imaging element having the aforementioned quantum dot film is immersed in silica gel and allowed to stand for 4 to 5 days to form a silica layer on the surface of the aforementioned quantum dot optical fiber imaging element, and then polished to obtain the aforementioned optical fiber imaging element for X-ray detection.

[0068] In some embodiments, the aforementioned method for preparing CsPbX3 quantum dots comprises the following steps:

[0069] PbX2 is dissolved in an organic solvent, and then oleylamine and oleic acid are added, and the mixture is reacted at 130-170°C in an inert gas atmosphere for 1-3 hours, and then cesium oleate solution is quickly injected, stirred evenly at 130-170°C, and then cooled in an ice water bath to generate the CsPbX3 quantum dots.

[0070] Specifically, for example, 0.069 g of PbBr2 is dissolved in 5 mL of octadecene, and then 0.5 mL of oleylamine and 0.5 mL of oleic acid are added, reacted at 150 ° C for 1 h in a nitrogen atmosphere, and then 0.4 mL of cesium oleate solution is quickly injected, and then stirred at 150 ° C for 10 s, and finally cooled in an ice water bath to generate CsPbBr3 quantum dots. After cooling, CsPbBr3 quantum dots can be separated from the solvent by centrifugation.

[0071] In some embodiments, the method for preparing the aforementioned cesium oleate solution comprises the following steps:

[0072] CsCO3 and oleic acid are mixed with an organic solvent and fully reacted at 130-170°C in an inert gas atmosphere to obtain the aforementioned cesium oleate solution.

[0073] Specifically, for example, 0.814 g of CsCO 3 and 2.5 mL of oleic acid are dissolved in octadecene, and the mixture is fully reacted at 150° C. in a nitrogen atmosphere to prepare a cesium oleate solution.

[0074] In some embodiments, the method for preparing the aforementioned silica gel comprises the following steps:

[0075] Add silicon tetrachloride to the ethanol solution, stir thoroughly, then add hydrochloric acid and stir until there are no bubbles, to obtain the aforementioned silica gel.

[0076] The present invention proposes the application of any of the above-mentioned optical fiber imaging elements for X-ray detection in the field of X-ray detection. For example, the optical fiber imaging element for X-ray detection proposed by the present invention can be installed on an X-ray detector for use.

[0077] 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.

[0078] 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.

[0079] Embodiment 1:

[0080] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0081] (1) preparing glass raw materials; in terms of oxide mass percentage, the glass raw materials include: 30% SiO2; 30% H3BO3; 20% ZnO; 10% Cs2CO3; 5% PbBr2; and 5% NaBr.

[0082] (2) Pour 10 g of high-purity raw material into a mortar and grind for 20 min to fully mix it. Then pour it into a 10 ml crucible and place it in a high-temperature furnace and heat it at 1050° C. for 10 min to obtain a glass melt.

[0083] (3) The glass melt is then poured into a brass mold to obtain a precursor glass.

[0084] (4) Finally, the precursor glass is annealed at 400°C for 2 h to induce the in-situ growth of CsPbBr3 in the glass matrix to obtain CsPbBr3 quantum dot glass.

[0085] (5) Process the CsPbBr3 quantum dot glass into a sheet quantum dot glass with a diameter of 30 mm and a thickness of 1 mm. Use a syringe to drop 0.2 ml of epoxy resin glue 2 at the center of the sheet quantum dot glass, and control the optical fiber panel 3 to slowly descend vertically until it is in full contact with the quantum dot glass. At this time, the thickness of the epoxy resin glue 2 is 10 μm, and then it is cured at high temperature for 3 hours at 60°C to achieve complete curing. After curing, the quantum dot glass is polished to 100 μm to form a quantum dot glass layer 1, and an optical fiber imaging element for X-ray detection is obtained, and its structural schematic diagram is shown as follows: Figure 1 shown.

[0086] (6) The optical fiber panel 3 in step (5) is replaced with a quartz plate to prepare a quantum dot quartz plate.

[0087] The prepared CsPbBr3 quantum dot glass was subjected to X-ray diffraction test, and the results are as follows: Fig. 9 As shown in the figure, it can be seen that the peaks correspond to those of the PDF standard comparison card, proving that high-purity CsPbBr3 quantum dots have been successfully synthesized.

[0088] The luminescence intensity of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection was tested using a radiation luminescence spectrometer. The test results are as follows: Figure 4 As shown, A is a quantum dot quartz plate, and B is an optical fiber imaging element for X-ray detection. The peak positions of both are at 530nm and the peaks are sharp, indicating that the sample has high luminous intensity and high purity. The luminous intensity of the quantum dot quartz plate is 100%, and the luminous intensity of the optical fiber imaging element for X-ray detection is 80%, that is, the signal intensity loss after coupling the quantum dot glass with the optical fiber panel 3 is 20%. The quantum yield of the test quantum dot quartz plate is 40%, and the quantum yield of the optical fiber imaging element for X-ray detection is 31%.

[0089] Embodiment 2:

[0090] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0091] The difference between this embodiment and embodiment 1 is that the optical fiber panel 3 is replaced by an optical fiber light cone 4. The structural schematic diagram of the obtained optical fiber imaging element for X-ray detection is shown in FIG. Figure 2 shown.

[0092] The luminescence intensity of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection was tested using a radiation luminescence spectrometer. The test results are as follows: Figure 5As shown, A is a quantum dot quartz plate, and B is an optical fiber imaging element for X-ray detection. The peak positions of both are at 530nm and the peaks are sharp, indicating that the sample has high luminous intensity and high purity. The luminous intensity of the quantum dot quartz plate is 100%, and the luminous intensity of the optical fiber imaging element for X-ray detection is 75%, that is, the signal intensity loss after coupling the quantum dot glass with the optical fiber light cone 4 is 25%. The quantum yield of the quantum dot quartz plate is 40%, and the quantum yield of the optical fiber imaging element for X-ray detection is 30%.

[0093] Embodiment 3:

[0094] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0095] The difference between this embodiment and embodiment 1 is that the optical fiber panel 3 is replaced by an optical fiber image invertor 5. The structural schematic diagram of the obtained optical fiber image transmission element for X-ray detection is shown in FIG. Figure 3 shown.

[0096] The luminescence intensity of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection was tested using a radiation luminescence spectrometer. The test results are as follows: Figure 6 As shown, A is a quantum dot quartz plate, and B is an optical fiber imaging element for X-ray detection. The peak positions of both are at 530nm and the peaks are sharp, indicating that the sample has high luminous intensity and high purity. The luminous intensity of the quantum dot quartz plate is 100%, and the luminous intensity of the optical fiber imaging element for X-ray detection is 62%, that is, the signal intensity loss after coupling the quantum dot glass with the optical fiber light cone 4 is 38%. The quantum yield of the quantum dot quartz plate is 40%, and the quantum yield of the optical fiber imaging element for X-ray detection is 24.8%.

[0097] Embodiment 4:

[0098] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0099] The difference between this embodiment and embodiment 1 is that the quantum dot glass in this embodiment is CsPbCl3 quantum dot glass with a fluorescent color of blue light. In terms of oxide mass percentage, the CsPbCl3 quantum dot glass ratio is 30% SiO2; 30% H3BO3; 20% ZnO; 10% Cs2CO3; 5% PbCl2; 5% NaCl. 10g of high-purity raw materials are fully mixed and melted in air at 1050°C for 12min to produce a uniform glass melt. The glass melt is then poured into a brass mold to obtain a precursor glass. Finally, the precursor glass is annealed by heating at 400°C for 2h to induce in-situ growth of CsPbCl3 in the glass matrix to obtain CsPbCl3 quantum dot glass.

[0100] The luminescence intensity of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection was tested using a radiation luminescence spectrometer. The test results are as follows: Figure 7 As shown, A is a quantum dot quartz plate, and B is an optical fiber imaging element for X-ray detection. The peak positions of both are at 450nm and the peaks are sharp, indicating that the sample has high luminescence intensity and high purity. The luminescence intensity of the quantum dot quartz plate is 100%, and the luminescence intensity of the optical fiber imaging element for X-ray detection is 80.2%, that is, the signal intensity loss after coupling the CsPbCl3 quantum dot glass with the optical fiber panel 3 is 19.8%. This is because the optical fiber panel 3 has a lower absorption rate in the blue light band, so the luminescence intensity loss of the CsPbBr3 quantum dots is less than that of the green light. The quantum yield of the test quantum dot quartz plate is 40%, and the quantum yield of the optical fiber imaging element for X-ray detection is 31%.

[0101] Embodiment 5:

[0102] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0103] The difference between this embodiment and embodiment 1 is that the quantum dot glass in this embodiment is CsPbI3 quantum dot glass with a fluorescent color of red light. In terms of oxide mass percentage, the ratio of CsPbI3 quantum dot glass is 30% SiO2; 30% H3BO3; 20% ZnO; 10% Cs2CO3; 5% PbI2; 5% NaI. 10g of high-purity raw materials are fully mixed and melted in air at 1050°C for 12min to produce a uniform glass melt. The glass melt is then poured into a brass mold to obtain a precursor glass. Finally, the precursor glass is annealed at 400°C for 2h to induce in-situ growth of CsPbI3 in the glass matrix to obtain CsPbI3 quantum dot glass.

[0104] The luminescence intensity of the quantum dot quartz plate and the optical fiber imaging element for X-ray detection was tested using a radiation luminescence spectrometer. The test results are as follows: Figure 8 As shown, A is a quantum dot quartz plate, and B is an optical fiber imaging element for X-ray detection. The peak positions of both are at 630nm and the peaks are sharp, indicating that the sample has high luminescence intensity and high purity. The luminescence intensity of the quantum dot quartz plate is 100%, and the luminescence intensity of the optical fiber imaging element for X-ray detection is 79.7%, that is, the signal intensity loss after coupling the CsPbI3 quantum dot glass with the optical fiber panel 3 is 20.3%. This is because the optical fiber panel 3 has a strong absorption rate in the red light band, so the luminescence intensity loss of the CsPbBr3 quantum dots is greater than that of the green light. The quantum yield of the quantum dot quartz plate is 40%, and the quantum yield of the optical fiber imaging element for X-ray detection is 30.8%.

[0105] Embodiment 6:

[0106] This embodiment provides an optical fiber imaging element for X-ray detection and a method for preparing the same.

[0107] (1) 0.814 g of CsCO3 and 2.5 mL of oleic acid were dissolved in octadecene and reacted at 150° C. in a nitrogen atmosphere to prepare a cesium oleate solution.

[0108] (2) 0.069 g of PbBr2 was dissolved in 5 mL of octadecene, and then 0.5 mL of oleylamine and 0.5 mL of oleic acid were added. The mixture was reacted at 150 °C for 1 h in a nitrogen atmosphere. Then 0.4 mL of cesium oleate solution was quickly injected, and the mixture was stirred at 150 °C for 10 s. Finally, the mixture was cooled in an ice-water bath to generate CsPbBr3 quantum dots.

[0109] (3) After cooling, CsPbBr3 quantum dots are separated from the solvent by centrifugation.

[0110] (4) Disperse CsPbBr3 quantum dots in n-hexane to prepare a CsPbBr3 quantum dot solution. Add 0.4 ml of quantum dot solution to the surface of the optical fiber panel 3, and use the spin coating method to control the rotation speed to 500 rpm for 60 seconds to evenly coat the CsPbBr3 quantum dot solution on the surface of the optical fiber panel 3. Then heat it in an oven at 60°C for 30 minutes. Repeat 3 times to coat a quantum dot film with a thickness of 100 μm to obtain a quantum dot optical fiber panel.

[0111] (5) Add 100 ml of silicon tetrachloride to 460 ml of ethanol solution and stir thoroughly for 30 min, then add 230 ml of hydrochloric acid and stir until there are no bubbles to obtain silica gel. Soak one end of the quantum dot optical fiber panel coated with the quantum dot film in the gel, and after standing for 4-5 days, a layer of silica is formed on the surface of the quantum dot optical fiber panel. Polish the silica layer to form a quantum dot glass layer 1, and obtain an optical fiber imaging element for X-ray detection.

[0112] The prepared CsPbBr3 quantum dots were subjected to X-ray diffraction testing, and the results showed that high-purity CsPbBr3 quantum dots were successfully synthesized.

[0113] The luminous intensity of the quantum dot optical fiber panel in step (4) and the optical fiber imaging element for X-ray detection in step (5) was tested using a radiation luminescence spectrometer. The peak positions of both were at 530nm and the peaks were sharp, indicating that the samples had high luminous intensity and high purity. The luminous intensity of both was 100%, indicating that the addition of the silica layer did not affect the luminous intensity. The quantum yields of the optical fiber panel coated with the quantum dot layer in step (4) and the optical fiber imaging element for X-ray detection in step (5) were both 40%.

[0114] 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.

[0115] 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 change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An optical fiber imaging element for X-ray detection, characterized in that: It includes: Fiber optic imaging element; as well as, A quantum dot glass layer, wherein the quantum dot glass layer is arranged at one end of the optical fiber imaging element for image transmission; the quantum dot glass layer is made of CsPbX3 quantum dot glass, wherein X is at least one of Cl, Br and I; in the CsPbX3 quantum dot glass, the surface of the CsPbX3 quantum dots is covered with a glass matrix.

2. The optical fiber imaging element for X-ray detection according to claim 1, characterized in that: The components of the raw materials of the CsPbX3 quantum dot glass include: SiO2: 30-40%; H3BO3: 20-30%; ZnO: 15-20%; Cs2CO3: 10-15%; PbX2: 5-10%; and NaX: 5-10%.

3. The optical fiber imaging element for X-ray detection according to claim 2, characterized in that: The preparation method of the CsPbX3 quantum dot glass comprises the following steps: (1) preparing glass raw materials; (2) melting the glass raw materials to obtain a glass melt; (3) pouring the glass melt into a mold to obtain a precursor glass; and, (4) The precursor glass is annealed at 350-450° C. for 2-3 hours to obtain the CsPbX 3 quantum dot glass.

4. The optical fiber imaging element for X-ray detection according to claim 2, characterized in that: The thickness of the quantum dot glass layer is 100-500 μm.

5. A method for preparing an optical fiber imaging element for X-ray detection, characterized in that: It includes the following steps: Processing CsPbX3 quantum dot glass into a sheet to obtain sheet quantum dot glass; Coupling glue is dripped at the center of the sheet-like quantum dot glass, the optical fiber imaging element is controlled to vertically descend until it is in full contact with the sheet-like quantum dot glass, and then the coupling glue is solidified to prepare the optical fiber imaging element for X-ray detection.

6. A method for preparing an optical fiber imaging element for X-ray detection, characterized in that: It includes the following steps: Dispersing CsPbX3 quantum dots in an organic solvent to obtain a quantum dot solution; wherein X is at least one of Cl, Br and I; Coating the quantum dot solution on the surface of one end of the optical fiber imaging element for image transmission, drying, forming a quantum dot film, and obtaining a quantum dot optical fiber imaging element; The end of the quantum dot optical fiber imaging element having the quantum dot film is immersed in silica gel and allowed to stand for 4 to 5 days to form a silica layer on the surface of the quantum dot optical fiber imaging element, which is then polished to obtain the optical fiber imaging element for X-ray detection.

7. The preparation method according to claim 6, characterized in that: The preparation method of the CsPbX3 quantum dots comprises the following steps: PbX2 is dissolved in an organic solvent, and then oleylamine and oleic acid are added, and the mixture is reacted at 130-170°C in an inert gas atmosphere for 1-3 hours, and then cesium oleate solution is quickly injected, stirred evenly at 130-170°C, and then cooled in an ice water bath to generate the CsPbX3 quantum dots.

8. The preparation method according to claim 7, characterized in that: The preparation method of the cesium oleate solution comprises the following steps: CsCO3 and oleic acid are mixed with an organic solvent and fully reacted at 130-170° C. in an inert gas atmosphere to obtain the cesium oleate solution.

9. The preparation method according to claim 6, characterized in that: The preparation method of the silica gel comprises the following steps: Silicon tetrachloride is added to the ethanol solution, and the mixture is fully stirred. Then, hydrochloric acid is added and stirred until there are no bubbles, thereby obtaining the silica gel.

10. Application of the optical fiber imaging element for X-ray detection according to any one of claims 1 to 4 in the field of X-ray detection.

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