UV emitting single crystalline film scintillators grown by LPE method: current status and perspective
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UV emitting single crystalline film scintillators grown by LPE method: current status and perspective Yuriy Zorenko1,3; Vitaliy Gorbenko1; Volodymyr Savchyn1; Taras Voznyak1; Miroslaw Batentschuk2; Albrecht Winnacker2; Qi Xia2; Christoph Brabec2 1 Electronic Department of Ivan Franko National University of Lviv, 79017 Lviv, Ukraine; 2 Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany 3 Institute of Physics, Kazimierz Wielki University in Bydgoszcz, 85-090 Bydgoszcz, Poland ABSTRACT This work is dedicated to the development of new type of UV phosphors based on single crystalline films (SCF) of aluminum garnet compounds grown by liquid phase epitaxy (LPE). The development of two types of UV emitting SCF scintillators is reported in this work: 1) Pr-doped SCF of Y-Lu-Al garnet having the intensive Pr3+ f-d luminescence in the 300-400 nm spectral ranges with a decay time of about 13-18 ns; 2) SCF of Y-Lu-Al-garnet doped with Sc3+ isoelectronic impurity emitting in the 290-400 nm range due to the formation of the ScY,Lu and ScAl centers with a luminescence decay time in the order of several hundred ns. INTRODUCTION This work is related to the development of new type of phosphors based on single crystalline films (SCF) of oxide compounds (aluminum garnets and perovskites, sapphire, silicates, tungstates, i.e.) grown by liquid phase epitaxy (LPE). The field of applications of such phosphors is rapidly extending in last decade and includes now screens for visualization of x-ray images, α– and β-scintillators, cathodoluminescent light sources, laser media as well as converters of LED radiation [1, 2]. The main goal of our work is to report on the development of UV emitting SCF scintillating screens based on aluminum garnet compounds. The shift of emission spectra of SCF to the UV range with respect to recently developed YAG:Ce and LuAG:Ce SCF scintillastors with emission in the visible (450-750 nm) range [1] in principle can result in an increase of the light yield (LY) and energy resolution of scintillators. Specifically, using the UV-emitting SCF scintillating screens can significantly improve the spatial resolution of detectors for visualization of X-ray images [3]. Development of the raster scanning optical microscope technique also requires different UV cathodoluminescent light sources for the investigation of biological objects. The Pr3+ and Sc3+ ions show intensive emission in the UV range in single crystal (SC) of YLu-Al garnets [4, 5]. The single crystalline films (SCF) of these compounds also are considered now for application as cathodoluminescent (CL) screen and scintillating screens for highresolution 2D-imaging [6, 7]. Our work is dedicated to grown by the liquid phase epitaxy (LPE) method and detail studying the luminescence and scintillation properties of Pr3+ and Sc3+ doped SCFs of Y3Al5O12 (YAG) and Lu3Al5O12 (LuAG) garnets. The following main features of the Pr3+ and Sc3+ luminescence in these SCF are considered in this work: (i) dependence of intens
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