Method for preparing thallium-doped caesium iodide (CsI:T1) film

Abstract

The invention relates to a preparation technology of a functional film material and provides a method for preparing a thallium-doped caesium iodide (CsI:T1) film. According to the method, the high-performance 50-100 micrometer thallium-doped caesium iodide (CsI:T1) film which is attached to the substrate very well and compatible with a CMOS (Complementary Metal-Oxide-Semiconductor transistor) process can be prepared on a substrate uniformly and compactly by adopting a thermal evaporation mode, and the thallium-doped caesium iodide (CsI:T1) film can be widely applied to X-ray detectors.

Description

technical field [0001] The invention relates to a preparation technology of a functional thin film material, and provides a preparation method of a thallium-doped cesium iodide (CsI:Tl) thin film. Background technique [0002] Since X-ray was discovered by Roentgen, it has shown more and more uses in front of human beings, from the initial X-ray photosensitive negative film to the later X-ray photodetection device, from aerospace to high-energy physics, from military to medical treatment and so on. From production to life to scientific research and space exploration, this terrifying ray shows its unique charm. Among them, the detection technology used by X-ray is the most important development direction among them. [0003] CsI:Tl is a scintillator material with excellent performance. It not only has high light output but also has good radiation intensity. It is easy to match the spectrum with silicon photocells. It has excellent mechanical properties and relatively low pro...

AI Technical Summary

Problems solved by technology

At this stage, the scintillator materials used in the detection of X-rays in my country, whether it is CsI:Tl or NaI:Tl, are still in the stage of bulk materials. In the Chinese patent 94112210.7 "drop method to grow large-sized cesium iodide (CsI ) crystal technology", Chinese patent 97112901.0 "Cesium iodide-based scintillation material and its preparation method", Chinese patent 200310109480.7 "Thallium-doped cesium iodide crystal growth technology using simple powder as deoxidizer" and Chinese patent 96116387.9 "Non-vacuum "Technology for growing thallium-doped cesium iodide crystals by descent method" are all new technologies and new processes for preparing cesium iodide crystals. The preparation technology of cesium iodide crystals is very mature, but there is no preparation of thallium-doped cesium iodide in China. Report on (CsI:Tl) Thin Films

Due to the application of thallium-doped cesium iodide crystal as a bulk material, there are defects in the application, namely: large volume, not light, not easy to integrate, and additional connection equipment (such as optical fiber) is required to connect with the detector, etc.

Therefore, the CsI:Tl crystal used in X-ray detection and other applications has a large volume and needs to be improved in various aspects, especially in terms of integration.

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