Inorganic materials group deals with a number of RE doped materials and explore size effect on luminescent properties of nanocrystals.

Main results:

Recently a number of pronounced effects determined by influence of quantum size effects on the doped nanocrystals luminescence properties have been revealed:

• Non-uniform doped ion distribution has been revealed for RE-doped nanocrystals with different radii of impurity and regular ion. This effect has been explained to be a result of doped ion segregation and manifests itself in pair formation even at low doped ion concentration and in low threshold of luminescence concentration quenching. read more

• Abnormal narrow spectral lines observed even at room temperature have been revealed for a number of nanocrystals. This effect is determined by weakening of phonon scattering on the impurity centre as a result of the size effect in nanocrystal phonon subsystem. read more

• The strong “hot” fluorescence from the upper Stark levels has been observed. This effect must be considered to be the immediate result of suppression of phonon-assisted relaxation under the effect of phonon quantum confinement.

• The possibility of afterglow and thermoluminescence properties controlling by means of co-dopant introduction with different donor-acceptor properties has been shown. Introduction of hole traps promotes increasing of the energy storage effect, whereas introduction of electron traps produces the additional channel of charge carrier recombination reducing the energy storage level. read more

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