Organic-inorganic hybrid copper-based halide scintillator, preparation and application thereof

Abstract

The invention belongs to the technical field of preparation and application of semiconductor materials, and discloses an organic-inorganic hybrid copper-based halide scintillator, preparation and application thereof, wherein the chemical general formula of the scintillator is AxCuyXz, A is [(CH3)(CH2)n]4N<+>, Cu is a cuprous ion Cu<+>, and X is halogen and is selected from at least one of Cl, Br and I. Compared with the prior art, the single crystal scintillator has the advantages that the variety of the single crystal scintillator can be effectively expanded, the emission spectrum can be adjusted in a visible light region, the fluorescence quantum yield (PLQY) reaches up to 96.7%, and the single crystal scintillator can be applied to the fields of high-energy ray detection, X-ray medical imaging and security inspection, nondestructive testing, industrial flaw detection and the like. The preparation process is simple, the cost is low, and large-scale industrial production can be realized. The flexible film obtained on the basis of the method can be particularly applied to flexible X-ray imaging, and very high imaging resolution and an excellent imaging effect are obtained.

Description

technical field [0001] The invention belongs to the technical field of semiconductor material preparation and application, and more specifically relates to an organic-inorganic hybrid copper-based halide scintillator and its preparation and application, especially applicable to flexible X-ray imaging. Background technique [0002] Scintillators are a class of materials that can emit visible light after absorbing high-energy particles, and play a very important role in the field of radiation detection. The preferred solution for detectors in CT imaging systems is the scintillator-based indirect detector, the key part of which is the scintillator that converts incident high-energy X-ray photons into visible light. As the key core material of medical imaging equipment, scintillators have received extensive attention. After decades of development and research, scintillator materials exhibit excellent scintillation properties and are widely used in medical imaging, luggage securi...

AI Technical Summary

Problems solved by technology

But CsPbX 3 As a scintillator, perovskite nanocrystals still have their own shortcomings and deficiencies, such as the toxic element lead, which limits its commercial development; there is a serious self-absorption phenomenon, which limits the light extraction efficiency when it is made into a thin film, which leads to light output. Low; the three-dimensional lattice structure is not conducive to enhancing the quantum confinement effect of excitons, which is not conducive to the improvement of luminous efficiency; the stability of perovskite nanocrystals is poor, which is not conducive to practical applications.

[0005] In the prior art, researchers have obtained the scintillator material CsCu 2 x 3 , CsAg 2 x 3 , RbCu 2 x 3 (Can refer to Chinese patent document CN109943322A), but: (1) the all-inorganic copper-based halide material of (1) this class, the material that prepares is all powder form, very inconvenient when being used for scintillator application, is unfavorable for powder and Detectors (such as photomultiplier tubes) are integrated to detect X-rays, and the powder is in an amorphous state, which is inconvenient to operate, and cannot be used to prepare flexible films; (2) and, in the above-mentioned reported all-inorganic copper-based halide patents Part of the preparation method will use high-temperature and high-pressure hydrothermal kettle and muffle furnace, which has certain dangers in the operation process. If the operation is not done properly, the lid of the hydrothermal kettle will often not be unscrewed, or the lid will be directly damaged due to pressure problems. If it is collapsed, improper operation will easily cause explosive hazards, and it is reported that strong acidic reagents such as hydroiodic acid will be used in the patent. In the preparation step, the reaction temperature is required to be slowly lowered from 150 ° C to room temperature, and the cooling rate is 2 ° C / h, it can be seen that the material preparation process in the reported patent is complicated and difficult to control, and the requirements for the operation process are too high. At the same time, strong acidic reagents are used, as well as dangerous high-temperature and high-pressure equipment such as hydrothermal kettles and muffle furnaces; (3) Although the all-inorganic copper-based halide materials reported in this patent respond to X-rays, it is difficult to directly prepare flexible films due to the very loose powder state, and cannot be used for flexible X-ray imaging.

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