A kind of quantum dot composite scintillator material and preparation method thereof

A scintillator material and quantum dot technology, applied in the field of nuclear radiation detection, can solve the problems of low density of porous materials, inability to transmit energy absorption, and low detection efficiency, and achieve the effects of high scintillation efficiency, easy popularization and application, and cheap mass production.

Active Publication Date: 2019-03-01
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection efficiency of this material is not high, the main reason is that the density of the porous material is low, there is no correlation coupling between the porous material matrix itself and the quantum dots, and the energy absorption of the matrix material for radiation such as gamma rays cannot be transferred to the quantum dots

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  • A kind of quantum dot composite scintillator material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2g of styrene (styrene), 40mg of dialkyl lead, 200mg of organic luminescent agent p-TP, and an oil-soluble quantum dot CdSe / ZnS luminescent material with a solid content equivalent to 200mg that has been distilled under reduced pressure (take 10ml of liquid, the content per milliliter is 20mg). In an anaerobic bottle, vacuum and flush with nitrogen, and mix with ultrasound for 2 hours. Keep warm at 30°C for 100 hours in an incubator, then slowly raise the temperature (2°C / h) to 50°C and keep it for 50 hours, then slowly raise the temperature (2°C / h) to 100°C and keep it for 50 hours to make it completely polymerized solidified. Finally, it was naturally cooled to room temperature. The final sample is obtained by removing the sample from the anaerobic bottle and cutting and polishing.

[0030] In order to fully illustrate the impact of the introduction of lead and organic luminescent agents on the scintillation characteristics, we prepared samples containing only...

Embodiment 2

[0033] A quantum dot composite scintillator material, including an organic plastic matrix PS and organic high atomic number materials dispersed in the organic plastic matrix, an organic luminescent body and a quantum dot luminescent material, wherein the organic high atomic number material used is dialkyl Lead, the content is 1wt%, the organic luminescent body is p-TP, the wavelength range is 340-380nm, the content is 5wt%, the quantum dot luminescent material is CdSe, the size is 2nm, the light emission range is 400-750nm, the content is 10wt%.

[0034] The preparation method of quantum dot composite scintillator material adopts the following steps:

[0035] (1) Disperse the vacuum-distilled organic plastic substrate, organic high atomic number material, and organic light-emitting body in a non-polar solution, quantum dot light-emitting material, in an anaerobic bottle, vacuumize and flush with nitrogen, and use ultrasonic mixing;

[0036] (2) Keep warm at 30°C in a thermosta...

Embodiment 3

[0039]A quantum dot composite scintillator material, comprising an organic plastic matrix PMMA and an organic high atomic number material dispersed in the organic plastic matrix, an organic luminescent body and a quantum dot luminescent material, wherein the organic high atomic number material used is bismuth carboxylate , the content is 3wt%, the organic luminescent body is PPO, the wavelength range is 340-380nm, the content is 10wt%, the quantum dot luminescent material is a core-shell structure quantum dot is CdSe / ZnS, the size is 5nm, and the luminous range is 400-750nm, The content is 15wt%.

[0040] The preparation method of quantum dot composite scintillator material adopts the following steps:

[0041] (1) Disperse the vacuum-distilled organic plastic substrate, organic high atomic number material, and organic light-emitting body in a non-polar solution, quantum dot light-emitting material, in an anaerobic bottle, vacuumize and flush with nitrogen, and use ultrasonic m...

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Abstract

The invention relates to a quantum dot composite scintillator material, and a preparation method thereof. The quantum dot composite scintillator material comprises an organic plastic matrix, and 1 to 5wt% of an organic high atomic number material, 5 to 15wt% of an organic luminophor, and 10 to 20wt% of a quantum dot luminescent material which are dispersed in the organic plastic matrix. Compared with the prior art, the quantum dot composite scintillator material possesses following advantages: doping of the organic high atomic number material is capable of improving blocking capacity on high energy photons; establishment of energy transferring between a matrix material and a quantum dot material is capable of achieving high scintillation efficiency of the quantum dot luminescent material under radiation excitation.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, and in particular relates to a quantum dot composite scintillator material and a preparation method thereof. Background technique [0002] Nuclear radiation detection plays an important role in high-energy physics experiments, nuclear physics experiments, nuclear medical imaging, cosmic ray detection, synchrotron radiation applications, weapon research, anti-terrorism security inspection, nuclear emergency response, etc., including many national security and large scientific devices major needs. Nuclear radiation detection includes time-resolved, energy-resolved, and space-resolved measurements of various charged particles (such as electrons, protons, alpha particles, fission fragments), neutral particles (such as neutrons) and high-energy photons (such as X-rays and gamma rays). and particle screening measurements. Among numerous nuclear radiation detection devices, scintillation det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09K11/56
CPCC09K11/06C09K11/565C09K2211/14
Inventor 刘波程传伟顾牡陈鸿张娟楠
Owner TONGJI UNIV
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