Abstract
The investigation of cubic spherical submicron particles of non-doped Y2O3and Y2O3doped with Eu3+in a TEM using CL from individual particles is described.
Highlights
Y2O3 is excited by a-particles,[7] UV-radiation (207 nm)[8] or X-rays,[9,10,11,12,13] a broad luminescence band is observed between 340 nm and 500 nm
X-ray diffraction was only used for the analysis of the oxalateprecipitated samples of Y2O3:Eu3+, because urea-precipitated samples of Y2O3 and Y2O3:Eu3+ after annealing at 980 1C for 4 hours are known to consist of the cubic phase for 100%
In the preceding sections we have described the cathodoluminescence of undoped Y2O3 and Y2O3:Eu3+ crystals in the transmission electron microscope (TEM) by high-energy electron bombardment
Summary
Y2O3 is excited by a-particles,[7] UV-radiation (207 nm)[8] or X-rays,[9,10,11,12,13] a broad luminescence band is observed between 340 nm and 500 nm. This erratic behaviour of the luminescence of Y2O3 elicited the following statement from Fukabori et al.7 ‘‘Light yields of Y2O3 ceramics are different from specimen to specimen. Nature of this phenomenon is not clear yet’’. Fukabori et al.[7] found a relation between the scintillation light output and crystal size in their Y2O3 samples: the larger the crystallites, the higher the light output
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