Abstract
Alumina ceramics with manganese in concentration range 0.001-18 wt. % are synthesized. Luminescent properties of obtained ceramics at temperatures 1500-1700°C of sintering in vacuum are investigated. An increase in the manganese concentration leads to quenching of the pulse cathodoluminescence band at 420 nm and the main dosimetric peak at 460 K. The intensity of luminescence in the 676 nm band at manganese concentrations of more than 1 wt. % and the TL yield for all the observed peaks increase when annealing temperature rises. Sublinear increase in TL intensity with a growing dose is observed in the range of 3-1000 Gy in 460 and 620 K peaks.
Highlights
The investigation of luminescent characteristics of materials is important for the creation of effective optoelectronic devices and systems
The Pulse cathodoluminescence (PCL) spectra show that multistage synthesis leads to the formation of luminescent centers in alumina ceramics: intrinsic centers of Al2O3 in the 420 nm band, doped centers Mn in the 676 nm band and impurity centers present in the initial powder with small concentrations – Cr (λ=693 nm)
In this work alumina ceramics with manganese concentration varying in a wide range are synthesized during high-temperature sintering in vacuum at various temperatures
Summary
The investigation of luminescent characteristics of materials is important for the creation of effective optoelectronic devices and systems. The study of charge transfer processes in wide-gap dielectrics is an actual problem in condensed matter physics, since these processes determine many of the radiation-optical, luminescent, and electrical properties of materials. Such materials can be created by forming impurity luminescence centers in their structure [1,2,3,4]. The optical properties of various oxides doped with various impurities as matrices with high quantum yield of luminescence have been intensively studied. The doping leads to the new luminescence centers formation because of changes in the crystal lattice and the creation of a defective structure in the material. Impregnation in a solution containing the necessary admixture [9, 10] is one of the most effective methods of impurity
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