Department of Inorganic Chemistry

Granting Departments:	Institute of Photonics and Electronics of the CAS, v. v. i. Department of Inorganic Chemistry
Study Programme/Specialization:	Chemistry and Technology of Materials ( in English language )
Supervisor:	Ing. Jan Mrázek, Ph.D.

Annotation

The increasing power of infrared radiation sources requires new materials with increased luminescence efficiency and temperature stability. Rare earth-doped nanocrystalline materials represent a suitable alternative to conventional glass and single crystals. The work targets the preparation and characterization of transparent nanocrystalline materials on the system Y2O3-Al2O3-SiO2 doped with rare earth elements. The effects of the composition and conditions of preparation on the reaction and growth mechanisms of nanocrystals evenly distributed in an amorphous matrix will be studied. The studied system's composition will be modified to reduce the phonon energy of nanocrystals and increase the luminescence efficiency in the infrared region. A theoretical model of energy transfer in rare-earth ions will be elaborated, and the results will be compared with experimental results of luminescence measurements. Selected materials will be used for the preparation of active optical fibers, which will be tested in fiber laser set-ups.