M. Gaft, L. Nagli
Laser Distance Spectrometry (LDS),
Physical Chemistry of Luminescence Materials Laboratory, Lyon 1 University, UMR
5620 CNRS, Villeurbanne, France
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.