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Single-crystalline, polycrystalline and nanostructured luminescent materials for ionizing radiation detection

Work number - M 21 AWARDED

Authors: Gorbacheva T. E., Rebrova N. V., Malyi T. S., Zhyshkovych A. V.

Presented by the Institute for Scintillation Materials of NAS of Ukraine

The aim of the work was to study the luminescence and scintillation properties of materials with different morphology (i.e. single-crystalline, polycrystalline and nanostructured) considering various organic and inorganic dielectric matrices.

A series of new single-crystalline luminescent materials that vary considerably in their properties has been received and investigated by the authors. It was shown that in a complex halide matrix of the scintillator the completely isomorphic substitutions of component ions leads to an improvement in the light yield and decreases the decay time of scintillation pulse.

The influence of deep traps of structural origin those arise in composite and polycrystalline organic scintillators on their optical and scintillation characteristics has been studied. It has been shown that the localization of charge carriers on deep traps in polycrystalline and composite materials leads to arising of new luminescence centers in the long-wavelength region and affects the formation of scintillation pulse.

Luminescence-kinetic properties of fluoride and phosphate nanoparticles activated with rare-earth ions were studied. The dependences of the radiative relaxation of high-energy electronic excitations for different size of nanocrystals, nature of luminescent centers and the energy range of excitation quanta have been determined. It was shown that luminescence quenching in nanoparticles is observed when the nanoparticles sizes are higher than photoelectron thermalization length.

The obtained results extend the existing knowledge on the physical properties of the scintillation materials and open up opportunities for the creation of highly efficient nanoscintillators, large-area polycrystalline and composite detectors and new single-crystal detectors for low energy gamma-ray spectroscopy.

The number of publicationsis 92, which includes 37 scientific articles (24 is in the Scopus database) and 55 conference abstracts. By Scopus the total number of references to the scientific publications presented in the work is 151 and the h-index of the work is 8; by Google Scholar the total number of references is 182 and the h-index of the work is 9