High light output scintillator surface photonic structure and preparation method

A photon structure and scintillator technology, applied in the field of nuclear radiation detection, can solve the problems of insufficient combination of surface structure and scintillator, uncertain optical properties, small covering layer thickness, etc., to achieve enhanced light extraction efficiency and scintillation light output The effect of high, high flicker light output

Inactive Publication Date: 2017-07-28
TONGJI UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent example discloses TiO 2 Overlay, TiO 2 It has two crystal structures of rutile and anatase, and the density and refractive index corresponding to the two structures are quite different, so the uncertainty of optical properties is large, which is not conducive to use, and the thickness of the covering layer is small, which will The combination between the surface structure and the scintillator is not strong enough

Method used

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  • High light output scintillator surface photonic structure and preparation method
  • High light output scintillator surface photonic structure and preparation method
  • High light output scintillator surface photonic structure and preparation method

Examples

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Effect test

Embodiment 1

[0034] Cut and polished to a size of 3×3×2cm 3 of (Lu,Y) 2 SiO 5: Ce scintillator, the emission center wavelength of the scintillator is 420nm. A two-step electrochemical anode process was used to prepare a transplantable double-pass porous anodic aluminum oxide film: a high-purity aluminum foil with a purity of 99.99wt% after vacuum annealing at 500°C for 2 hours was used as the anode, and a graphite plate was used as the cathode, with a concentration of 0.2mol The citric acid solution per liter is used as the electrolyte, and the aluminum foil is oxidized for the first time at a temperature of 10°C and a voltage of 250V, and the oxidation time is 1 hour; soaked in a mixed solution of 6.0% phosphoric acid and 1.8% chromic acid After the first oxidation of the aluminum foil for 3 hours, the barrier layer of porous alumina was removed to obtain a double-pass porous structure; then the second oxidation process was carried out under the same conditions as the first oxidation pr...

Embodiment 2

[0036] In this example, the size is 5×5×1cm 3 Bi 4 Ge 3 o 12 A scintillator, the emission center wavelength of the scintillator is 510nm. A two-step electrochemical anode process was used to prepare porous anodic aluminum oxide films: a high-purity aluminum foil with a purity of 99.99 wt% after vacuum annealing at 500 ° C for 2 hours was used as the anode, a graphite plate was used as the cathode, and lemon with a concentration of 0.5 mol / l was used. The acid solution is the electrolyte, and the aluminum foil is first oxidized at a temperature of 0°C and a voltage of 280V, and the oxidation time is 2 hours; the first oxidation is soaked in a mixed solution of 6.0% phosphoric acid and 1.8% chromic acid After 4 hours of aluminum foil, the barrier layer of porous alumina was removed to obtain a double-pass porous structure; then the second oxidation process was carried out, the conditions were consistent with the first oxidation process, and the time was 3 minutes; finally the...

Embodiment 3

[0038] This example is basically the same as Example 2, the difference is that the average pore spacing of the prepared porous anodic aluminum oxide film is about is 408nm, the average pore diameter is about 204nm, the height is 149nm, and the atomic layer deposition thickness of the high refractive index conformal dense layer is 122nm. The luminescence spectrum of the prepared sample has a certain enhancement near the peak and the whole spectrum.

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Abstract

The invention relates to a photon structure on the surface of a high light output scintillator, comprising a scintillator, porous anodized aluminum arranged on the light emitting surface of the scintillator, the outer surface of the porous anodized aluminum is covered with a high refractive index conformal dense layer, and the high refractive index conformal The refractive index n' of the dense layer is greater than the refractive index n of the porous anodized aluminum oxide. Compared with the prior art, the present invention combines the photonic structure formed by the porous anodized aluminum structure and the conformal dense layer with high refractive index on the surface of the scintillator to achieve a substantial increase in light output efficiency, and at the same time, due to the existence of the conformal dense layer, the The entire surface structure is very strongly bonded to the scintillator surface.

Description

technical field [0001] The invention belongs to the field of nuclear radiation detection, and in particular relates to a surface photon structure and a preparation method of a scintillator with high light output. Background technique [0002] Scintillation detection systems play an important role in nuclear medical imaging, high-energy physics experiments, nuclear physics experiments, security inspections, cosmic ray detection, and nuclear explosion test diagnosis. The function of the scintillator as the core functional material in the scintillation detection system is to absorb high-energy particles or high-energy rays and convert them into visible light, also known as scintillation light. Ray detection. Therefore, the conversion efficiency of the scintillator is very important to improve the detection efficiency. At present, most commonly used scintillators have high internal quantum efficiency, but because the refractive index of the scintillator is usually large (refra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K4/00G01T1/202
Inventor 刘波朱智超程传伟顾牡陈鸿
Owner TONGJI UNIV
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