PHYSICS OF IONIC CRYSTALS
phone: +372 7 383026; +372 7 428 946
Main research area:
Basic research is carried out in the field of fundamental photo-physical phenomena in wide-gap inorganic materials and prospects of their application in technology using the methods:
- short-wavelength spectroscopy (4-40 eV),
- thermoactivation spectroscopy (4-750 K), electron paramagnetic resonance and radiation physics.
- Synchrotron radiation facilities i are widely used as well.
i - in cooperation with MAX-LAB I, Lund (beam-line BL 52) and HASYLAB at DESY, Hamburg (SUPERLUMI station)
The main topics include:
- free and self-trapped excitons in wide-gap ionic crystals;
- migration, relaxation and different types of self-trapping in wide-gap materials;
- non-radiative decay of electronic excitations with the formation of Frenkel defects (F-H and alpha-I pairs);
- optical effects caused by multiplication of electronic excitations in crystals excited by VUV radiation;
- structure and dynamics of electronic excitations in crystals doped with ns2 and nd10 impurity ions;
- wide-gap materials as effective spectral transformers of VUV radiation for luminescent lamps and devices;
- recombination-, intraband- and crossluminescene, fast radiation detectors;
- radiation-sensitive materials for memory devices and selective dosimeters;
- radiation-resistant materials for short-wavelength laser optics.
The main objects are
single crystals, optical ceramics and powders of binary and comlex metal oxides (MgO, CaO, SrO, Al2O3, Sc2O3, Y2O3, Ga2O3, MgAl2O4, YAlO3, Y3Al5O12, tungstates, silicates, aluminates, zeolites, sodalites, etc.); We investigate both highly pure samples and samples doped with several ns2, nd10, rear-earth, etc. impurity ions.
single crystals of alkali and alkaline-earth halides.
The main goal
of our research activity is the investigation of the fundamental peculiarities of intrinsic and impurity electronic excitations in wide-gap (Eg=5-15 eV) inorganic materials in comparison with narrow-gap semiconductors thoroughly studied by now. Wide-gap compounds are widely used for various technical applications as laser materials, spectral transformers for luminescent lamps and devices, electronics components, radiation-resistant materials, detectors and dosimeters of various kinds of radiation, memory devices, various sensors and catalytic agents.
More detailed explanations of our goals and historical background are on the page
"Our investigations: goals and some historical aspects".
Last updated 14.02.2001