Abstract
Nanopowders (particle size of about 7-14 nm) of yttrium oxide doped with cerium ions with concentrations of 1, 5, 10 at.% have been synthesized by laser ablation of the target. For the first time in the world the cerium concentration of 10 at.% in the yttrium oxide lattice has been obtained. Their morphology, structure, and scintillation properties have been investigated. No significant cathodoluminescence of the activator in the Ce3+ state has been detected in the powders, and X-ray luminescence was completely absent. Presumably, the cerium ion is in the nonradiative state of Ce4+.
Highlights
Ceramic materials research continues to evolve around the world
Nanopowders of yttrium oxide doped with cerium ions with concentrations of 1, 5, 10 at.% have been synthesized by laser ablation of the target
The luminescence bands of Ce3+ ions are absent in the pulsed cathodoluminescence (PCL) spectra of the nanopowders with different cerium contents. This situation may be due to the fact that cerium in the Ce:Y2O3 nanopowders is in the tetravalent state Ce4+, which is inactive in luminescence
Summary
Ceramic materials research continues to evolve around the world. one of the main advantages of ceramics is the possibility of doping a large number of active centers [1] with concentrations up to 30 at.% [2], which is not achievable in single crystals, where the threshold does not exceed 1 at.%.One of the applications of ceramics is their use as scintillators. One of the main advantages of ceramics is the possibility of doping a large number of active centers [1] with concentrations up to 30 at.% [2], which is not achievable in single crystals, where the threshold does not exceed 1 at.%. Yttrium aluminum garnet doped with cerium ions is a well-known and well-established scintillation material. This material was already synthesized and examined by the authors. An increase in the speed of the scintillator was recorded (from 110 to 26 ns) with an increase in the concentration of cerium activating ions (from 0.1 to 5 at.%). The authors believe that this is possible, and this is due to the concentration quenching effect
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