Fine-grained powder crystal phosphors SrTiO 3 :Pr 3+ and SrTiO 3 :Pr 3+ , Al have been investigated. Their photoexcitation, luminescence, and photoconductivity spectra have been recorded. It is found that only one center ( ) is responsible for the luminescence in SrTiO 3 :Pr 3+ , while the luminescence in SrTiO 3 :Pr 3+ , Al is due to two centers: ( ) × and . A mechanism of energy transfer upon luminescence excitation from the ( ) × center is proposed.
Dependence of luminous efficiency in the Y2O3: Eu‐Gd2O3: Eu solid solutions which are highly promising for application in FED was studied. Their volt‐luminance characteristics have been explained on the basis of the sensibilization effects of the Eu3+ emission with Gd3+ ions and by decrease of the penetration depth of the primary electrons into the phosphor. This allowed to determine a thickness of a “dead layer” and to show its dependence on the phosphor synthesis conditions.
The properties of SrTiO3:Pr3+:Al luminescent structure under the photoexcitation are investigated. The excitation spectra of luminescence and photocon‐ductivity are obtained. The relationship between the luminescence intensity and concentration of coactiva‐tor (Al) is explored. It is shown, that two centers of luminescence in the strontium titanate are formed. It can be explained by different location of praseodymium ions in the SrTiO3 host lattice (Pr3+ substitutes Sr2+ and Pr3+ substitutes Ti4+).
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