Zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof

A scintillation crystal and perovskite technology, which is applied in crystal growth, X/γ/cosmic radiation measurement, single crystal growth, etc., can solve problems such as low photoluminescence quantum yield, negative impact on human body and environment, and achieve transparency Good, good stability, high quantum luminous efficiency effect

Active Publication Date: 2020-12-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, Sn 2+ Easily oxidized to Sn at room temperature 4+ , and due to inherent crystal defects, CsSnX 3 The photoluminescence quantum yield of the crystal is very low, less than 0.5%
In the past few years, Sb-based and Bi-based perovskites have also been investigated as substitutes for lead elements in perovskites, such as Cs 3 Sb 2 Br 9 and Cs 3 Bi 2 Br 9 , but Sb and Bi ions are heavy metals, which will also have negative effects on the human body and the environment

Method used

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  • Zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof
  • Zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof
  • Zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Mix 5mL N,N-dimethylformamide (DMF) and 5mL dimethyl sulfoxide (DMSO) at a temperature of 25°C to prepare a mixed solution;

[0028] (2) Add cesium iodide and cuprous iodide with a molar ratio of 3:2 to the above mixed solution, and rotate and stir at a temperature of 25° C. for 12 hours at a rotation speed of 500 rpm to prepare a supersaturated precursor solution;

[0029] (3) Filter the above-mentioned supersaturated precursor solution with a 2 μm funnel once, and put it into a crystal growth bottle;

[0030] (4) Place the crystal growth bottle on a heating platform and heat it to 27°C, and the crystals will start to grow slowly;

[0031] (5) Control the temperature of the growth bottle to rise at a rate of 0.5° C. / day to carry out crystal growth, and stop growing when the temperature reaches 33° C.

[0032] Structure Characterization

[0033] The perovskite prepared in this embodiment 1 is carried out structural characterization to the crystal, and the result o...

Embodiment 2

[0039] (1) Mix 4mL N,N-dimethylformamide (DMF) and 6mL dimethyl sulfoxide (DMSO) at a temperature of 25°C to prepare a mixed solution;

[0040] (2) Add cesium iodide and cuprous iodide with a molar ratio of 3:3 to the above mixed solution, rotate and stir for 15 hours at a temperature of 25° C., and rotate at a speed of 1500 rpm to prepare a supersaturated precursor solution;

[0041] (3) Filter the above-mentioned supersaturated precursor solution twice with a 2 μm funnel, and put it into a crystal growth bottle;

[0042] (4) Place the crystal growth bottle on a heating platform and heat it to 27°C, and the crystals will start to grow slowly;

[0043] (5) Control the temperature of the growth bottle to rise at a rate of 1° C. / day for crystal growth, and stop growing when the temperature reaches 36° C.

Embodiment 3

[0045] (1) Mix 6mL N,N-dimethylformamide (DMF) and 4mL dimethyl sulfoxide (DMSO) at a temperature of 40°C to prepare a mixed solution;

[0046] (2) Add cesium iodide and cuprous iodide with a molar ratio of 3:2 to the above mixed solution, rotate and stir at a temperature of 40°C for 6h, and the rotation speed is 1000rpm to prepare a supersaturated precursor solution;

[0047] (3) Filter the supersaturated precursor solution 3 times with a 5 μm funnel, and put it into a crystal growth bottle;

[0048] (4) Place the crystal growth bottle on the heating platform and heat it to 42°C, and the crystal will start to grow slowly;

[0049] (5) Control the temperature of the growth bottle to rise at a rate of 1°C / day to carry out crystal growth, and stop growing when the temperature reaches 50°C.

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Abstract

The invention discloses a zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof. The zero-dimensional Cs3Cu2I5 perovskite scintillation crystal is prepared through the steps that firstly, N, N-dimethylformamide and dimethyl sulfoxide are mixed evenly to prepare a mixed solution, cesium iodide and cuprous iodide are added into the mixed solution, stirring is conducted to prepare a supersaturated precursor solution, and finally crystal growth is conducted through an inverse temperature crystallization method after the supersaturated precursor solution is filtered. When the Cs4PbI6 perovskite crystal is prepared, the inverse temperature crystallization method is adopted, operation is easy, controllability is high, repeatability is good, and large-scale industrialproduction can be achieved; meanwhile, the crystal prepared by the method is good in transparency, good in stability, high in quantum luminous efficiency and high in responsivity, and can be used fornuclear radiation detection.

Description

technical field [0001] The invention belongs to the field of perovskites, in particular to a zero-dimensional Cs 3 Cu 2 I 5 Perovskite scintillation crystals and their applications. Background technique [0002] Scintillation detectors are currently one of the most widely used nuclear radiation detectors, which detect nuclear radiation by emitting visible light after absorbing high-energy particles or rays. Over the past decade, the increasing use of X-rays in human activities due to new requirements for medical, industrial and scientific imaging, as well as the development and utilization of powerful X-ray sources such as synchrotron radiation, has stimulated the investigation of scintillation The study of materials has led to the rise of the field. Therefore, intensive research and development is ongoing, and new scintillator preparation techniques are also being developed while constantly searching for new scintillation materials or optimizing existing ones. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B7/14G01T1/202
CPCC30B7/14C30B29/12G01T1/2023
Inventor 徐强张钦栋王隽欧阳晓平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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