Preparation method and application of pure organic high-resolution glass scintillator

Abstract

The invention discloses a preparation method and application of a pure organic high-resolution glass scintillator, and belongs to the technical field of optical function materials and detection. The pure organic high-resolution glass scintillator is composed of any one of the following structural formulas: # imgabs 0 #, # imgabs 1 # or # imgabs 2 #. The pure organic high-resolution glass scintillator is a single-component luminous source, the preparation method is simple, the preparation period is short, and the pure organic high-resolution glass scintillator does not contain environment-unfriendly elements such as lead and is convenient to popularize and use. Meanwhile, the light emitting life of the pure organic high-resolution glass scintillator is less than 10 ns, the short light emitting life remarkably avoids imaging ghosting caused by radiation afterglow, the resolution is improved, and a new tool is provided for the field of X-ray detection.

Description

Technical Field

[0001] The invention relates to the field of optical functional materials and detection technology, and in particular to a preparation method and application of a pure organic high-resolution glass scintillator. Background Art

[0002] Scintillators are widely used in medical imaging, industrial nondestructive testing, and safety inspection. When exposed to ionizing radiation, scintillators have the ability to convert the absorbed radiation energy into visible light. The converted visible light can be easily detected and measured by detectors (such as photomultiplier tubes or solid-state photodetectors), thereby locating and quantifying the radiation source.

[0003] The current scintillator technology has the following main defects: 1. The preparation process of traditional single crystal scintillators is cumbersome and usually requires a high temperature environment. 2. Inorganic scintillators and emerging perovskite scintillators usually use heavy metals to enhance their ability to absorb radiation. The presence of heavy metals often has an impact on the environment and human health. 3. In pure organic scintillators, their imaging usually relies on the formation of a thin film by doping a polymer matrix. The limited doping concentration and low-density distribution of luminescent centers often lead to poor imaging effects and low resolution.

[0004] In order to meet the diversification of social functions and the progress of science and technology, scintillators need to be continuously updated in terms of performance and quality. Therefore, the present invention is committed to developing a scintillator that has the advantages of the above materials and overcomes their disadvantages. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a preparation method and application of a pure organic high-resolution glass scintillator.

[0006] According to one aspect of the present invention, a pure organic high-resolution glass scintillator is proposed, which is composed of any of the following structural formulas: , or .

[0007] According to the second aspect of the present invention, a method for preparing the pure organic high-resolution glass scintillator is proposed, and the preparation method is as follows: S1. Using Dpbp as the luminescent center, modify different halogen atoms Cl, Br or I to obtain the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I; S2, weighing the luminescent molecule and placing it in a glass groove, heating the heating platform until the temperature is stable, and then placing the glass groove on the heating platform; S3, when the luminescent molecules begin to melt into a melt, stirring with a needle to make the melt spread evenly in the glass groove; S4, turning off the power of the heating platform, and the melt in S3 is slowly cooled to room temperature along with the heating platform, and is left to stand to obtain a uniform and transparent pure organic high-resolution glass scintillator.

[0008] Furthermore, the heating table in S2 is heated to 145° C. to 155° C., and the standing time in S4 is 4 to 6 minutes.

[0009] Furthermore, the preparation method of the luminescent molecule Dpbp-Cl in S1 is as follows: .

[0010] Furthermore, the preparation method of the luminescent molecule Dpbp-Br in S1 is as follows: .

[0011] Furthermore, the preparation method of the luminescent molecule Dpbp-I in S1 is as follows: .

[0012] Furthermore, the acquisition of the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I in S1 requires a purification step, and the purification step includes extraction, rotary evaporation, column chromatography and recrystallization.

[0013] Furthermore, the extraction is performed by using dichloromethane as the organic phase and water as the aqueous phase to perform liquid-liquid extraction.

[0014] Furthermore, the column chromatography uses a mixed system of petroleum ether and dichloromethane as the mobile phase and silica gel as the stationary phase.

[0015] According to a third aspect of the present invention, an application of the pure organic high-resolution glass scintillator in the field of X-ray detection is proposed.

[0016] Beneficial effects of the present invention: The scintillator provided by the present invention has low preparation cost, simple preparation method and short preparation cycle. The scintillator does not contain environmentally unfriendly elements such as lead, has no special requirements in recycling and treatment, and is easy to promote and use.

[0017] Second, the scintillator provided by the present invention is a single-component light source, and its preparation method is to form a transparent glass state by low-temperature hot melting in a glass matrix and then cooling to room temperature.

[0018] Third, the luminescence lifetime of the scintillator provided by the present invention is less than 10 ns. The shorter luminescence lifetime significantly avoids imaging afterimages caused by radiation afterglow, which helps to improve resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A state diagram of the pure organic high-resolution glass scintillator provided by the present invention under natural light; Figure 2 The XRD pattern of the pure organic high-resolution glass scintillator provided by the present invention; Figure 3 A transmittance diagram of the pure organic high-resolution glass scintillator provided by the present invention in the visible light region; Figure 4 The photoluminescence spectrum of the pure organic high-resolution glass scintillator provided by the present invention; Figure 5 A photoluminescence lifetime decay diagram of the pure organic high-resolution glass scintillator provided by the present invention; Figure 6 The X-ray luminescence spectrum of the pure organic high-resolution glass scintillator provided by the present invention; Figure 7 This is a stability diagram of the pure organic high-resolution glass scintillator provided by the present invention under X-rays. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In view of the shortcomings of the current scintillator technology, such as complicated preparation process, heavy metal involvement and poor imaging effect, the first object of the present invention is to propose a pure organic high-resolution glass scintillator.

[0023] The second object of the present invention is to provide a method for preparing the pure organic high-resolution glass scintillator, which is simple and has a short cycle.

[0024] The third object of the present invention is to propose an application of the pure organic high-resolution glass scintillator in the field of X-ray detection, wherein the luminescence lifetime of the scintillator is less than 10 ns. The shorter luminescence lifetime significantly avoids imaging afterimages caused by radiation afterglow, which helps to improve resolution.

[0025] Example 1: Preparation of pure organic high-resolution glass scintillator

[0026] The preparation of the pure organic high-resolution glass scintillator is based on the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I. The luminescent molecule uses Dpbp as the luminescent center and is modified with different halogen atoms Cl, Br or I.

[0027] The specific preparation method of the luminescent molecule Dpbp-Cl is as follows: .

[0028] The specific preparation method of the luminescent molecule Dpbp-Br is as follows: .

[0029] The specific preparation method of the luminescent molecule Dpbp-I is as follows: .

[0030] The above reaction product is extracted with dichloromethane and water to remove inorganic matter, and then the solvent is dried and purified by column chromatography (petroleum ether, dichloro system). Finally, the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I is obtained by recrystallization with dichloromethane and petroleum ether system. Then, the pure organic high-resolution glass scintillator, i.e., the scintillator of formula (I), the scintillator of formula (II) and the scintillator of formula (III) (corresponding to scintillator Dpbp-Cl, scintillator Dpbp-Br and scintillator Dpbp-I, respectively) is prepared according to the following steps: (1) Weigh 100 mg of the luminescent molecule and place it in a glass groove of 1 cm*1 cm*0.3 cm; (2) raising the temperature of the heating platform to 150° C. and placing the glass groove containing the luminescent molecules in step (1) on the heating platform after the temperature stabilizes; (3) After placing the glass groove containing the luminescent molecules in step (2) on a hot stage for a few seconds, the luminescent molecules are observed to begin to melt, and the melt is stirred with a needle to spread evenly on the glass groove; (4) Turn off the power of the heating table and slowly cool the uniform melt obtained in S3 to room temperature along with the heating table; (5) Place at room temperature for 5 minutes to obtain the corresponding scintillator of the luminescent molecule.

[0031] The prepared pure organic high-resolution glass scintillator is as follows Figure 1 As shown, at the same time, the structural formula of the pure organic high-resolution glass scintillator is as follows: .

[0032] Example 2: Performance test of pure organic high-resolution glass scintillator

[0033] In order to explore whether the pure organic high-resolution glass scintillator obtained in Test Example 1 forms an amorphous glass body after melting, an XRD test was performed. Figure 2 As shown in FIG. 1 , the pure organic high-resolution glass scintillator has no obvious crystal structure after melting, and forms an amorphous glass body. Figure 3 As shown, the transmittance of the pure organic high-resolution glass scintillator is maintained at 80% in the range of 550 nm-2500 nm, and it shows good transparency.

[0034] The luminescence performance of the pure organic high-resolution glass scintillator was further tested. Figure 4 and Figure 5 The photoluminescence spectrum and photoluminescence lifetime decay diagram of the pure organic high-resolution glass scintillator are respectively shown. It can be obtained that the fluorescence emission peaks of the pure organic high-resolution glass scintillator are all located at 480 nm, and the fluorescence lifetime of the scintillator of formula (I) (i.e., scintillator Dpbp-Cl) is 4.5 ns; since the atomic number of Br is larger than that of Cl, resulting in a larger spin coupling constant, the fluorescence lifetime of the scintillator of formula (II) (i.e., scintillator Dpbp-Br) is 2.4 ns; similarly, due to the introduction of heavier I atoms, resulting in a larger spin coupling constant, the fluorescence lifetime of the scintillator of formula (III) (i.e., scintillator Dpbp-I) is 0.9 ns; the fluorescence lifetime of the pure organic high-resolution glass scintillator is all below 10 ns, and the shorter luminescence lifetime significantly avoids the imaging afterimage caused by radiation afterglow, thereby improving the resolution.

[0035] Figure 6 is an X-ray luminescence spectrum of the pure organic high-resolution glass scintillator, and the results show that the characteristic emission peaks of the radiation luminescence of the pure organic high-resolution glass scintillator are basically consistent with the photoluminescence. Figure 7 As shown, the pure organic high-resolution glass scintillator has good stability under X-rays.

[0036] The above describes the specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pure organic high-resolution glass scintillator, characterized in that: It is composed of any of the following structural formulas: , or .

2. A method for preparing a pure organic high-resolution glass scintillator as claimed in claim 1, characterized in that: The preparation method is as follows: S1. Using Dpbp as the luminescent center, modify different halogen atoms Cl, Br or I to obtain the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I; S2, weighing the luminescent molecule and placing it in a glass groove, heating the heating platform until the temperature is stable, and then placing the glass groove on the heating platform; S3, when the luminescent molecules begin to melt into a melt, stirring with a needle to make the melt spread evenly in the glass groove; S4, turning off the power of the heating platform, and the melt in S3 is slowly cooled to room temperature along with the heating platform, and is left to stand to obtain a uniform and transparent pure organic high-resolution glass scintillator.

3. The method for preparing a pure organic high-resolution glass scintillator according to claim 2, characterized in that: The heating stage in S2 is heated to 145° C. to 155° C., and the standing time in S4 is 4 to 6 minutes.

4. The method for preparing a pure organic high-resolution glass scintillator according to claim 2, characterized in that: The preparation method of the luminescent molecule Dpbp-Cl in S1 is as follows: 。 5. The method for preparing a pure organic high-resolution glass scintillator according to claim 2, characterized in that: The preparation method of the luminescent molecule Dpbp-Br in S1 is as follows: 。 6. The method for preparing a pure organic high-resolution glass scintillator according to claim 2, characterized in that: The preparation method of the luminescent molecule Dpbp-I in S1 is as follows: 。 7. The method for preparing a pure organic high-resolution glass scintillator according to claim 2, characterized in that: The acquisition of the luminescent molecule Dpbp-Cl, the luminescent molecule Dpbp-Br or the luminescent molecule Dpbp-I in S1 further requires a purification step, and the purification step includes extraction, rotary evaporation, column chromatography and recrystallization.

8. The method for preparing a pure organic high-resolution glass scintillator according to claim 7, characterized in that: The extraction is performed by using dichloromethane as an organic phase and water as an aqueous phase to perform liquid-liquid extraction.

9. The method for preparing a pure organic high-resolution glass scintillator according to claim 7, characterized in that: The column chromatography uses a mixed system of petroleum ether and dichloromethane as a mobile phase and silica gel as a stationary phase.

10. Application of the pure organic high-resolution glass scintillator according to claim 1 in the field of X-ray detection.

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