Laser-induced time-resolved luminescence of Cr3+ in kyanite

M. Gaft, L. Nagli

 Laser Distance Spectrometry (LDS), Petach Tikva, Israel

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, Pasadena, USA 91125-2500


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.