The effect of pressure on the luminescence of Cr3+: YAG

Pressure-induced changes in the energetic structure of the 3d3 ions in solid matrices

“…Actually, all information on the energetic structure of the system is given by the values of 10Dq, x and S_o that define Hamiltonian (9). These quantities determine also the radiative lifetime and emission spectral lineshape.…”

“…The blue pressure shift of the 4 T 2 -4 A 2 emission band, of the order of tenths cm À1 /kbar, has been observed in low-field materials. Well known is also a small red shift of the R-lines emission corresponding the 2 E-4 A 2 transition, in the Cr 3+ ions in the high-field systems [8][9][10][11][12].…”

High pressure spectroscopy of rare earth ions doped crystals—new results

“…Well known case is the red shift of the 2 E ! 4 A 2 transition, the R lines emission, in the Cr 3+ ions in the high field system [13,[36][37][38]35]. The second important property of the system, that has to be considered is related to the effect of electron-lattice interaction resulting in the vibronic broadening of the emission and absorption bands.…”

Piezospectroscopic Analysis of the Residual Stresses in the Strontium Hexaluminate/Zirconia (SrAl12O19/ZrO2) System

“…(1) The frequencies of the two most-intense lines in SA6 are 14517 and 14542 cm −1 ; these values are very similar to the frequency exhibited by other crystal hosts where Cr 3+ cations are known to exhibit intense fluorescence lines (besides ruby, yttrium aluminum garnet (YAG) 11 has intense fluorescence lines at 14514 and 14533 cm −1 , and magnesium oxide (MgO) 12 has an intense fluorescence line at 14325 cm −1 ).…”

“…(4) The intensity of the doublet is much larger, with respect to the other features of the spectrum, as in ruby 10 and YAG. 11 Presently, we are unable to explain the reason for the inversion of the intensity of the doublet; in ruby and YAG, the peak with the highest intensity (R 1 ) appears at lower frequency, whereas in SA6 the peak with the largest intensity appears at higher frequency. Interestingly, the same inversion is present in -alumina, where the bands appear at 14540 and 14610 cm −1 and the latter is more intense.…”