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Glass film containing rare-earth-ion-doped lithium iodide microcrystalline and preparation method thereof

A rare earth ion and glass thin film technology, which is applied in the field of rare earth ion doped lithium iodide microcrystal glass thin film and its sol-gel preparation field, can solve problems such as device development limitations, overcome incomplete uniformity, and prevent decomposition High effect with volatilization and high transmittance

Inactive Publication Date: 2016-02-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually thin film and fibrous materials are the most suitable raw materials for making such devices, so the current form of scintillation materials will have great restrictions on the development of future devices

Method used

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  • Glass film containing rare-earth-ion-doped lithium iodide microcrystalline and preparation method thereof
  • Glass film containing rare-earth-ion-doped lithium iodide microcrystalline and preparation method thereof
  • Glass film containing rare-earth-ion-doped lithium iodide microcrystalline and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of the glass film containing rare earth ion-doped lithium iodide microcrystals comprises the following specific steps:

[0041] (1) The preparation raw materials are in molar ratio: tetraethoxygermanium: niobium ethylate: lithium iodide: cerium iodide=79: 24: 8: 1, take by weighing each preparation raw material that total amount is the analytical purity of 20 grams, stand-by;

[0042] (2), the hydrolysis of tetraethoxygermanium: the tetraethoxygermanium weighed in the step (1) is dissolved in dehydrated alcohol, and the mol ratio of dehydrated alcohol and tetraethoxygermanium is 2.5: 1, fast Add acetylacetone, the volume ratio of tetraethoxygermanium to acetylacetone is 0.8:1, and carry out strong magnetic stirring, gradually drop distilled water, the molar ratio of distilled water to tetraethoxygermanium is 0.8:1, adjust with concentrated nitric acid The pH value reaches 4-5, and the hydrolysis reaction is carried out at room temperature for 1 h...

Embodiment 2

[0051] It is basically the same as Example 1, except that in the step (1), the raw materials are prepared according to the following molar ratios: tetraethoxygermanium: niobium ethylate: lithium iodide: europium iodide=76: 16: 12: 4, respectively Weigh each raw material for preparation; in step (7), the pulling speed of the glass substrate in the gel solution is controlled at 1 mm / s, and the pulling is repeated 5 times, and the interval between each pulling is 15 minutes; step (8) In the process, the temperature is raised to 100°C at a rate of 50°C per hour, and then the furnace is heated to 340°C at a rate of 50°C per hour; in step (9), the furnace is gradually heated to 380°C, and the reaction is carried out 1 hour, the molar composition of the obtained glass film is: 76GeO 2 -8Nb 2 o 5 -12LiI-4EuI 3 .

[0052] For prepared Eu-containing 3+ Ion-doped lithium iodide microcrystalline glass film was tested for performance, and the XRD pattern of the glass film after hydrog...

Embodiment 3

[0054] It is basically the same as Example 1, except that in the step (1), the raw materials are prepared according to the following molar ratios: tetraethoxygermanium: niobium ethylate: lithium iodide: terbium iodide=78: 20: 10: 2, respectively Weigh each raw material for preparation; in step (7), the pulling speed of the glass substrate in the gel solution is controlled at 0.6 mm / s, and the pulling is repeated 3 times, and the interval between each pulling is 15 minutes; step (8) In the process, the temperature is raised to 100°C at a rate of 40°C per hour, and then the furnace is heated to 340°C at a rate of 40°C per hour; in step (10), the furnace is gradually heated to 370°C, and the reaction is carried out After 2 hours, the molar composition of the obtained glass film is: 78GeO 2 -10Nb 2 o 5 -10LiI-2TbI 3 .

[0055] For prepared Tb-containing 3+ Ion-doped lithium iodide microcrystalline glass film was tested for performance, and the XRD pattern of the glass film af...

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Abstract

A disclosed glass film containing rare-earth-ion-doped lithium iodide microcrystalline is characterized in that the glass film comprises the following compositions in percent by mole: 76-79 mol% of germanium oxide, 8-12 mol% of niobium pentoxide, 8-12 mol% of lithium iodide, and 1-4 mol% of a rare-earth iodide, wherein the rare-earth iodide is one of cerium iodide, europium iodide and terbium iodide. The advantages comprise that a sol-gel technology is a low-temperature wet-chemical-process glass preparation technology, the glass is obtained through hydrolysis of a precursor raw material and a polymerization chemical reaction process, the film material can be prepared under a certain liquid viscosity condition, and the low-temperature synthesis condition is capable of effectively preventing the iodide raw material from being decomposed and volatilized; and because of volatilization and decomposition of the solvent, certain micropores are generated in the glass prepared through the sol-gel method, and the micropores provide good environment for generation of nanometer iodide microcrystalline, and thus crystallized-particle nonuniformity and glass devitrificationcaused by incomplete uniformity of melt-glass chemical compositions and crystallization processing temperature are overcome to a certain degree.

Description

technical field [0001] The invention relates to a rare-earth ion-doped microcrystal glass film, in particular to a rare-earth ion-doped lithium iodide (LiI) microcrystal glass film used as a scintillation material and a sol-gel preparation method thereof. Background technique [0002] Scintillation material is a photofunctional material that can emit visible light under the excitation of high-energy rays (such as x-rays, γ-rays) or other radioactive particles, and can be widely used in nuclear medicine diagnosis, security inspection, anti-terrorism, high-energy physics and geological exploration and other fields. In recent years, with the rapid development of fields such as medical imaging and security inspection, there is a large demand for new scintillation materials with high performance. Excellent scintillation materials mainly have the following properties: high luminous efficiency, high material density, fast fluorescence decay, good radiation resistance and low produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/22
Inventor 江东升夏海平盛启国冯治刚王成张健何仕楠汤庆阳
Owner NINGBO UNIV