Spectroscopy of RE doped single crystalline films of perovskites and garnets

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:[1] T. Martin, A. Koch, J. Synchrotron Radiat. 13 (2006) 180-194. 

[2] A. Koch, C. Raven, P. Spanne, A. Snigirev, J. Opt. Soc. Am. A 15 (1998) 1940-1951. 

[3] F. Riva, P.-A. Douissard, T. Martin, F. Carlá, Yu. Zorenko, C. Dujardin, Cryst. Eng. Comm. 18 (2016) 608-615. 

[4] Yu. Zorenko, et al., J. Cryst. Growth. 457 (2017) 220-226

[5] Yu. Zorenko, V. Gorbenko, T. Zorenko, K. Paprocki, F. Riva, P.A. Douissard, T. Martin, Ya. Zhydachevskii, A. Suchocki, A. Fedorov, Cryst. Eng. Comm. 20 (2018) 937-945. 

[6] V. Gorbenko, T. Zorenko, K. Paprocki, F. Riva, P.-A. Douissard, T. Martin and Yu. Zorenko, Cryst. Eng. Comm. 21 (2019) 1433-144. 

[7] A. Markovskyi, P. Radomski, W. Dewo, V. Gorbenko, A. Fedorov, T. Runka, Y. Zorenko, Mat. Res. Bull. 182 (2025) 113141.

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