Abstract
Ceramics doped with chromium oxide were synthesized from alumina nanopowder at high heating and cooling rates. XRD analysis of the obtained samples shows that they consist mainly of Al2O3 α-phase. Photoluminescence (PL) spectra in the visible spectral region and thermoluminescence (TL) curves were measured. An effect of the dopant concentration on the intensity and shape of the PL bands as well as on the TL yield was found. Annealing of the quenching defects which emerged during the synthesis changed the PL spectra. The centers responsible for PL and TL in the synthesized ceramics were identified.
Highlights
The investigation of optical properties of oxygen-deficient alumina ceramics synthesized by solid-phase method from nanopowder showed the opportunities of their use as phosphors, which can arouse interest in optoelectronics
It is known that photoluminescence (PL) properties of such ceramics depend on the concentration of the oxygen vacancies, which form the traps of charge carriers, and take part in recombination processes
The purpose of this work is to study luminescence of oxygen-deficient alumina ceramics doped with chromium oxide
Summary
The investigation of optical properties of oxygen-deficient alumina ceramics synthesized by solid-phase method from nanopowder showed the opportunities of their use as phosphors, which can arouse interest in optoelectronics. During the synthesis in the highly reducing medium (deep vacuum, the presence of graphite), the loss of mass and changing of the sample sizes take place, which leads to some particular difficulties of the usage of luminescent ceramics. In this regard, development of a synthesis method of luminescent Al2O3-based ceramics which do not cause the abovementioned negative effects is an important task. It is known that ions of Cr3+ can replace Ali3+ in the crystal lattice of alumina In this case one can expect the formation of new centers which can increase PL and TL without the use of strong reducing medium while synthesis. The purpose of this work is to study luminescence of oxygen-deficient alumina ceramics doped with chromium oxide
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