The luminescent and scintillation properties of YAlO₃ and YAlO₃:Ce single crystalline films grown by liquid phase epitaxy from BaO‐based flux

Abstract

Single crystalline films (SCFs) of undoped and Ce 3+ -doped YAlO 3 (YAP) perovskite were crystallized by liquid-phase epitaxy method onto YAP substrates for the first time from the novel lead-free BaO-B 2 O 3 -BaF 2 fluxes. The absorption, luminescence, and scintillation properties of these films are measured and compared with the films grown from the standard PbO-B 2 O 3 flux. It appears that the films obtained from the BaObased flux exhibit better luminescent and scintillation properties with respect to films grown from the PbO-based one.

Single Crystalline Film Scintillators Based on the Orthosilicate, Perovskite and Garnet Compounds

“…On the other hand, flux components are introduced in the SCF and strongly influence their luminescence and scintillation properties [19,20,24,25,28]. Usually, the SCFs prepared from the PbO-based flux, can contain lead ions preferably in the Pb 2+ charge state.…”

“…Since the PbO-based melt dissolves the Pt-crucible, Pt ions can also be introduced in the orthosilicate, perovskite or garnet lattices. As a consequence, various locally non-compensated lattice defects can be created, what may result in the decrease of the scintillation efficiency and LY of SCF scintillators [19,20,25,28].…”

“…The LY of the mentioned SCF can be optimized mainly by means of optimization of activator content in MS [19,20,25,26]. Taking [20]) and (Y,Lu)AP SCF (of about 0.7 [21]).…”

“…We also performed preliminary testing the LuAP:Ce SCF screens for visualization of X-ray image [15]. The scintillation and luminescent properties of these films were studied as well [22][23][24][25]. Strong decrease (more than three times) of the LY of YAP:Ce and LuAP:Ce SCF, with respect to the LY of their SC analogues was noted due to the influence of Pb-based flux-related centers on the Ce 3+ luminescence in perovskite hosts [24,25].…”

Novel UV-emitting single crystalline film phosphors grown by LPE method

“…The liquid phase epitaxy (LPE) for the last three decades shows itself as a beneficial method for the development of phosphors based on single crystalline films (SCF) of oxide compounds (Robertson and van Tol, 1984;Ferrand, et al, 1999;Zorenko, et al, 1990Zorenko, et al, , 2002Zorenko, et al, , 2003Zorenko, et al, , 2009aZorenko and Gorbenko, 2009;Kucera et al, 2008). The application fields of such SCF phosphors now include the a-and b-scintillators, screens for visualization of X-ray images and cathodoluminescent (CL) screens, thermoluminescent media and luminescent converters of LED (Zorenko, et al, 2005).…”