Fabrication of columnar CsI and CsI:Na scintillation films deposited by vacuum thermal evaporation at high deposition rates

摘要

Alkali halides have been increasingly used as scintillators and sensors in imaging and experimental particle physics applications. The luminescence efficiency of alkali halides is an important aspect of their application in imaging studies and related fields. Therefore, we investigate the optical, scintillation, and hygroscopic properties of cesium iodide (CsI) and sodium-doped CsI (Csl:Na) films grown via vacuum deposition at high deposition rates similar to 90 nm/s. The film deposited on a protective layer (such as: SiO2, Al, or parylene-N) exhibits the desired properties of having a columnar structure, high moisture resistance, and high luminescence. Our process quickly yields high-quality CsI and Csl:Na films with thicknesses greater than 100 gm that exhibit the desired columnar structure and luminescence effect. (C) 2015 Elsevier Ltd. All rights reserved.