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Directional transmission scintillant device with surface microstructure array and preparation method of device

A microstructure array and directional emission technology, which is applied in the field of nuclear radiation detection, can solve problems such as no significant change in emission directionality and no dependence on specific angles, so as to improve light extraction efficiency, increase sensitivity and signal-to-noise ratio, and realize mass production Effect

Active Publication Date: 2018-12-21
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For scintillators whose thickness is much larger than the emission wavelength (thickness greater than 100 micrometers), there are a large number of modes in the emitting layer, and scintillators using photonic crystal structures will cause the emission angle characteristics to be averaged, showing no dependence on specific angles
For example, the patent with the publication number CN 104280761 A discloses a scheme using a photonic crystal surface structure to improve the light output efficiency, but its emission directionality does not change significantly

Method used

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  • Directional transmission scintillant device with surface microstructure array and preparation method of device
  • Directional transmission scintillant device with surface microstructure array and preparation method of device
  • Directional transmission scintillant device with surface microstructure array and preparation method of device

Examples

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preparation example Construction

[0035] A method for preparing a directional emission scintillator device with a surface microstructure array, the process flow is as follows image 3 As shown, the following steps are taken:

[0036] (1) Obtain the scintillator substrate through cutting, polishing and cleaning;

[0037] (2) Prepare a hexagonal close-packed polystyrene microsphere array on the surface of the scintillator substrate by self-assembly method;

[0038] (3) The diameter of a single polystyrene microsphere is reduced by an oxygen reactive ion beam etching method, and its central position is kept unchanged;

[0039] (4) Heating the sample at 115-120 degrees Celsius for 30-50 minutes to obtain a hemispherical structure;

[0040] (5) A conformal inorganic transparent medium layer is prepared by magnetron sputtering or atomic layer deposition technology, and a directional emission scintillator device with a surface microstructure array is prepared.

[0041] The following are further implementations.

Embodiment 1

[0043] The scintillator substrate used in this example has a surface area of ​​20X20mm 2 , (Lu,Y) with a thickness of 3mm 2 SiO 5 : Ce scintillation crystal. The structure of the polystyrene microlens array is designed as a hexagonal structure, a hemispherical structure, a bottom diameter D=10 micrometers, and a gap L between the microlenses=2 micrometers.

[0044] In order to clearly understand the luminescence enhancement effect of the microlens, we use a calculation method based on the ray tracing principle to simulate the effect of the microlens array on luminescence enhancement with different structural parameters. Figure 4 Shown is the effect of different microlens bottom diameters on the light output enhancement of the scintillator when the inter-microlens gap L=0. We found that for the diameter of 10-100 microns, the light output has a significant enhancement effect, which also shows that it is appropriate for us to set the diameter of the microlens in the range of...

Embodiment 2

[0053] A directional emission scintillator device with a surface microstructure array, including a scintillator substrate, a microlens array arranged on the surface of the scintillator substrate, a conformal inorganic transparent medium layer attached to the surface of the microlens array, the thickness of the scintillator substrate It is not less than 100 microns, and the thickness of the scintillator substrate is relatively thick, so it is different from the existing photonic crystal guided mode resonance regulation and control principle and method of luminescence directionality.

[0054] The material of the scintillator substrate used is inorganic scintillator (Lu,Y) 2 SiO 5 : Ce, the microlens array is an array of hexagonal structures formed by hemispherical monomers, the diameter of the bottom of the hemispherical monomers is 10 microns, and the distance between each hemispherical monomer is not greater than the radius of the bottom. In this embodiment, the distance is th...

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Abstract

The invention relates to a directional transmission scintillant device with a surface microstructure array and a preparation method of the device. The device comprises a scintillant substrate, a micro-lens array arranged on the surface of the scintillant substrate and a conformal inorganic transparent medium layer attached to the surface of the micro-lens array, wherein the thickness of the scintillant substrate is not smaller than 100 microns. Compared with the prior art, optical output of a scintillant in a specific direction can be remarkably improved in a radiation detector, and thereforethe sensitivity and the signal-to-noise ratio of a detection system are improved.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, and in particular relates to a directional emission scintillator device with a surface microstructure array and a preparation method thereof. Background technique [0002] Scintillator is a functional material that absorbs high-energy particles or high-energy rays and converts them into visible light. The visible light emitted by scintillators, also called scintillation light, is received by subsequent photodetection devices such as photomultiplier tubes, photodiodes and CCD devices. , so as to realize the detection of high-energy particles or high-energy rays. The scintillator is the core component of the scintillation detection system, and the luminescence characteristics of the scintillator directly determine the performance of the detection system. Scintillation detection systems play an increasingly important role in high-energy physics experiments, nuclear physics experiments, nuc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/20
CPCG01T1/2002
Inventor 刘波程传伟张娟楠顾牡陈鸿陈亮刘金良欧阳晓平
Owner TONGJI UNIV