Luminescence and radiation-induced defects in Li2B4O7:Eu single crystals

Abstract

Thermostimulated luminescence (TSL) of Li 2 B 4 O 7 and Li 2 B 4 O 7 :Eu single crystals in the temperature range 290-650K has been studied. Lithium tetraborate (LTB) doped with europium has been found to favour a further increase of the light sum storage of electroncaptured centres. Radiation-induced defects and their participation in recombination process in LTB:Eu are considered. Suggestions about character of Eu site in the host lattice based on the photoluminescence spectral data are discussed. The electron structure of LTB crystals measured by XPS method is presented.