APT Producing Rare Earth Ion Doped Scintillated Film

Inorganic scintillated material is a new optical functional material, which absorbs energy in the X-rays, rays or other high-energy particles will emit ultraviolet or visible light. An important application of the scintillated material is coupled into scintillation counter with photomultiplier tube (PMT), silicon photodiode (Si-PD) or CCD detector, and becoming an important detection equipment of high-energy and nuclear physics, nuclear medicine. Ammonium paratungstate (APT) is an important raw material for preparing inorganic scintillated material, and doping with rare earth ions to improve its properties.

The steps of APT producing rare earth ion doped scintillated film are as follows:
1. Dissolving APT into deionized water to form a solution;
2. Adding the complexing agent-- citric acid into APT solution and mixing well to obtain the first precursor containing with tungsten, the pH value supposed to be controlled among 7-10;
3. Adding the soluble salt containing with Eu and Ln into water or alcohol to form a second precursor containing with Eu and Ln, and the pH value is controlled among 2-4;
4. Mixing the first precursor and the second precursor uniformly to get a transparent sol precursor, in which the concentration of Eu plus Ln is 0.02-2.0mol/L;
5. A precursor film is formed from the precursor obtained in step 4 by spin coating or dip;
6. Calcining the precursor film at 400-700℃;
7. Carrying out the annealing treatment at 700-1000°C to obtain ion rare earth ion doped APT scintillated film.

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