Spectroscopy of RE doped single crystalline films of perovskites and garnets
Date, time: 14 May 2025, 1:00 p.m.
Speaker: Prof. dr hab. Tomasz Runka (Institute of Materials Research and Quantum Engineering, Faculty of Materials Science and Technical Physics, Poznan University of Technology)
Abstract: The development of the microimaging technique using X-ray or synchrotron radiation in industry requires the use of scintillation screens with high spatial resolution [1,2]. Therefore, scintillation screens based on single crystalline films (SCFs) grown using liquid-phase epitaxy (LPE) method play an important role in detectors used for 2D/3D imaging in X-ray synchrotrons with spatial resolution in the micron and submicron range [1]. Single crystalline films of rare-earth doped perovskites and garnets are very good candidates for these applications. The development of scintillation materials with emission in the visible range, e.g. SCFs of the Gd1- xLuxAlO3 perovskite doped with Eu3+ , Tb3+ and Ce3+ ions, with careful optimization of the composition (xvalue) to minimize the lattice mismatch and to obtain high optical quality needed for X-ray imaging, has already been implemented in the European Synchrotron Radiation Facility (ESRF) as part of the project to develop new scintillating screens for X-ray imaging detectors [3-6]. However, Ce3+ doped Y3Al5O12 (YAG:Ce) SCFs on undoped Y3Al5O12 (YAG) and Lu3Al5O12 (LuAG) substrate have been found to be a materials with wide and promising applications, e.g. cathodoluminescent screens, screens for the visualization of X-ray images, scintillators and luminescent converters [7]. In this talk I present Raman and high-resolution luminescence spectroscopy study to characterize the cross-section of the Eu3+ doped Gd0.6Lu0.4AlO3 SCF/YAP SC, GdAlO3 SCF/YAP SC, LuAlO3 SCF/YAP SC and Ce3+ doped Y3Al5O12 SCF/YAG and LuAG SC, especially, the region known as transition layer i.e. in the range close to the interface between SCF and SC substrate.
References:
Chairman: Prof. UAM dr hab. Aleksandra Trzaskowska
https://mtpr.amu.edu.pl/event/prof-tomasz-runka-politechnika-poznanska/