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  Journal of Spectroscopy and Dynamics 2013, 3: 22
  Research Article
Laser-induced time-resolved luminescence of Cr3+ in kyanite
  M. Gafta, L. Naglia, G. Panczerb, G. R. Rossmanc  
a Laser Distance Spectrometry (LDS), Petach Tikva, Israel
b Physical Chemistry of Luminescence Materials Laboratory, Lyon 1 University, UMR 5620 CNRS, Villeurbanne, France
c Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, USA

  Laser-induced time-resolved luminescence spectroscopy was applied to the study of kyanite luminescence 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 the 2Eg and 2T1 levels of a Cr3+ luminescence center in a site of intermediate crystal field strength 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.
  Kyanite; Time-resolved luminescence; Cr3+  

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