Growth of ultimate high-density scintillating films for high-resolution X-ray imaging at synchrotrons

被引：0
|
作者：
Wollesen L. [1 ,2 ]
Douissard P.-A. [1 ]
Cook P. [1 ]
Loiko P. [3 ]
Brasse G. [3 ]
Margueritat J. [2 ]
Camy P. [3 ]
Martin T. [1 ]
Dujardin C. [2 ,4 ]
机构：
[1] ESRF - The European Synhrotron, 71 avenue des Martyrs, Grenoble
[2] Universite Claude Bernard Lyon 1, Institut Lumière Matière UMR 5306 CNRS, 10 rue Ada Byron, Villeurbanne
[3] Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen, 6 Boulevard Maréchal Juin, Caen Cedex 4
[4] Institut Universitaire de France (IUF), 1 rue Descartes, Paris Cedex 05
来源：
Optical Materials: X | 2024年 / 22卷
关键词：
High-density compounds; Liquid phase epitaxy; Scintillation; Thin films;
D O I：
10.1016/j.omx.2024.100309
中图分类号：
学科分类号：
摘要：
Scintillators are X-ray to visible light converters applied in X-ray imaging detectors used at synchrotrons. Drastically improved performances of the 4th generation synchrotron sources enable us to perform X-ray imaging experiments at higher energies. For high spatial resolution X-ray imaging (micrometer to submicrometer), thin scintillating films are required. Consequently, especially for high X-ray energies (30 keV to 100 keV), the detection efficiency is limited due to the low X-ray absorption efficiency of the thin films. We have used Liquid Phase Epitaxy (LPE) to grow thin films of one of the ultimate high-density materials, Lu2Hf2O7:Eu3+, which demonstrate scintillating properties and thus combine high spatial resolution and maximized absorption efficiency. X-ray imaging experiments demonstrate that the Modulation Transfer Function (MTF) reaches 10% at 900 lp/mm, and radiographs visually confirm the promising imaging properties. We present structural, luminescent, and scintillation characterization of Lu2Hf2O7:Eu thin films grown on ZrO2:Y substrates, showing that the films crystallize in the disordered fluorite structure and the europium ions incorporate into the structure and enhance the luminescence intensity. This contribution is a first step toward developing promising ultra-dense, hafnate-based scintillating screens for high spatial resolution X-ray imaging. © 2024 The Author(s)
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