Borate single crystals for polyfunctional applications: production and properties

Literature data and results of authors' studies are rewieved concerning structure, growing conditions, non-linear optical, piezoelectric and spectral characteristics of borate single crystals Li₂B₄O₇, LiB₃O₅, b-BaB₂O₄, LaB₃O₆, Li₆Gd(BO₃)₃. A high scintillation efficiency of LaB₃O₆ and Li₆Gd(BO₃)₃:Ce single crystals as well as the high thermostimulated luminescence yield of Li₂B₄O₇: (Ce, Eu, Tm) ones have been demonstrated

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

Thermostimulated luminescence (TSL) of Li₂B₄O₇ and Li₂B₄O₇: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 electron-captured 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