Abstract:
The paper presents the research results of the luminescence of transparent mixed ceramics samples with the composition Er$_y$:(Sc$_x$Y$_{1-x}$)$_2$O$_3$+2 mol.% ZrO$_2$ at different scandium contents. Excitation of samples by laser diode radiation with a wavelength of 808 nm leads to up-conversion, as a result of which photoluminescence bands at the $^4S_{3/2}\to^4I_{15/2}$ (530–575 nm) and $^4I_{11/2}\to^4I_{15/2}$ (950 – 1050 nm) transitions appear in the visible and near IR regions of the spectrum. When excited by an electron beam with a duration of 2 ns with an average electron energy of 170 keV and a current density of 130 A/cm$^2$, along with yellow-green luminescence, there are additional emission bands of erbium ions, corresponding to the $^4F_{9/2}\to^4I_{15/2}$ (640–720 nm) and $^4S_{3/2}\to^4I_{13/2}$ (840–900 nm) transitions. With increasing scandium content in the samples, a red shift and broadening of the long-wavelength components of all erbium luminescence bands are observed. Using kinetic measurements, the lifetimes of the observed emissive levels have been determined.
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