THE EFFECT OF HIGH-PRESSURE ON R1 LINE FLUORESCENCE LIFETIME IN AL2O3-MN4+

The lifetime tau of the R1 fluorescence line, E-2((E) over bar) --> (4 )A(2) of alpha-Al2O3:Mn4+, has been measured under high pressure condi tions (up to 107 kbar). The study shows that tau rapidly increases wit h pressure and that this increase is primarily caused by a rapid chang ing in the wavenumber of the R1 line, compression rate and refractive index of the crystal. The presented measurements agree qualitatively w ith the theoretically predicted increase in tau with pressure.