M. Gaft, L. Nagli
Laser Distance Spectrometry (LDS),
G. Panczer
Physical Chemistry of Luminescence Materials Laboratory, Lyon 1 University, UMR
5620 CNRS, Villeurbanne, France
GR. Rossman
Division
of Geological and Planetary Sciences, California Institute of Technology,
Laser-induced
time
resolved luminescence spectroscopy was applied for kyanite luminescence
study
to clarify the origin of well known narrow emission lines with long
decay times.
Based on kinetic and polarized luminescence experiments, it is proposed
that
they are connected to transitions from 2Eg and 2T1
levels of Cr3+ luminescence center in a site of
intermediate
crystal within the kyanite structure. It contradicts the generally
accepted
interpretation that they are transitions from a split 2Eg
level of a Cr3+ luminescence center in a strong crystal
field
position. Some ideas are presented on the origin of narrow lines with
short
decay times and broad luminescence bands.