Single crystals of LiNbO3 doped with terbium were grown by the Czochralski
method and their optical properties were examined. It has been found that,
in contrast to isostructural LiTaO3:Tb, the terbium ions in LiNbO3 exhibit
intense luminescence at low temperatures only, up to about 150 K. At this t
emperature, a luminescence quenching mechanism with activation energy of 0.
22 eV is switched on. As a consequence, the luminescence of LiNbO3:Tb is re
duced to a negligible level at room temperature. (C) 2001 American Institut
e of Physics.