SPECTRAL-KINETIC CHARACTERISTICS OF CATHODOLUMINESCENCE OF LANTHANIDE NIOBATES (Y,Lu,Gd)NbO4:Bi3+

The study is devoted to the study of lanthanide niobates doped with bismuth ions, which are of interest as potential phosphors used in various fields of human activity, such as medicine, industry, and science. In this paper, an experimental study of the cathodoluminescence of niobates (Y,Lu,Gd)NbO₄:Bi³⁺, namely, spectral characteristics with time resolution, as well as the kinetics of luminescence attenuation for the main spectral bands, is carried out. The temperature dependence of the cathodoluminescence attenuation time for the YNbO4 sample is presented.:Bi³⁺ measured in the temperature range of 5–295 K with an interval of 10 K. The study of the kinetics of luminescence attenuation made in this study showed that at least three pronounced components are observed in the kinetics of attenuation at low temperature. Of the three components, the main contribution to the light sum is made by a slow microsecond component with a decay time in the range of 2–9 microseconds. However, the nanosecond kinetics of intrinsic luminescence of samples in the ultraviolet region of the spectrum is of particular interest. The presence of several fast components indicates the complex structure of this glow associated with the superposition of the glow bands of autolocalized excitons. The data obtained are of both scientific and practical interest in the further development of functional materials.

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