Rare earth oxide solid solution ceramic scintillator and preparation method thereof

Abstract

The invention discloses a rare earth oxide solid solution ceramic scintillator and a preparation method thereof. The main component of the ceramic scintillator is Gd2xLu2yY2(1-x-y-z)Eu2zO3 (the x is more than or equal to 0.1 and less than or equal to 0.6, the y is more than or equal to 0.1 and is less than or equal to 0.4, and the z is more than or equal to 0.01 and less than or equal to 0.1), and the ceramic scintillator has a crystal structure with a cubic Ia3 point group. Ceramic powder can be synthesized by a chemical coprecipitation method. The coprecipitation method adopts ammonia, ammonium hydrogen carbonate or a mixed solution of the ammonium water and the ammonium hydrogen carbonate as a precipitating agent, titrates the precipitating agent into a solution of gadolinium nitrate, lutecium nitrate, yttrium nitrate and europium nitrate to obtain a precipitate, and then the precipitate is dried and calcined to obtain nano-powder. The obtained powder is pressed into a ceramic blank through an isostatic compaction method, then the pressureless sintering is performed in vacuum or hydrogen atmosphere, the sintering temperature is between 1,600 and 1,900 DEG C, transparent Gd2xLu2yY2(1-x-y-z)Eu2zO3 ceramic can be obtained, a ceramic product with the needed dimension is prepared after the cutting, grinding and polishing, and the transmission rate of the ceramic in a visible region (400-800 nanometers) is more than or equal to 65 percent. The ceramic scintillator emits red light with a main wavelength of 610 nanometers under the excitation of ultraviolet light or X rays, and can be used for scintillating materials of imaging and detection of medical and industrial X rays.

Description

technical field [0001] The invention relates to a functional material and its preparation technology, in particular to a rare earth oxide solid solution ceramic scintillator and its preparation method. The invention belongs to the field of ceramic scintillation materials. Background technique [0002] Rare earth ion Eu 3+ doped cubic Gd 2 o 3 It is a very important luminescent and scintillation material. As early as 1964, Bril and Wanmaker studied its luminescent properties, and in recent years it has received widespread attention as a phosphor and thin film material. As a high-efficiency red phosphor, it has important application prospects in plasma imaging, high-definition television, projection television, flat panel display and other fields. As a scintillator, Gd 2 o 3 :Eu is a ceramic scintillator with excellent comprehensive performance, and it will have a very important application prospect in the fields of high-resolution X-CT, X-ray security inspection imagin...

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Problems solved by technology

[0004] However, the above methods all make Gd 2 o 3 : The scintillation performance of Eu becomes worse, too much LiCl or Y is added 2 o 3 It reduces the density of the material and the ability to absorb rays, and at the same time reduces the resolution of the detector. For example, GE company incorporates Y 2 o 3 Obtained (Y, Gd) 2 o 3 The density is only 5.9g / cm 3 ; while the incorporation of HfO 2 Stable Gd 2 o 3 Then make its flashing light output decrease, such as doping 5% HfO 2 50% reduction in post-UV emission intensity, limiting Gd 2 o 3 Application of materials in fields such as X-CT and security inspection equipment

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