SHIFT UNDER PRESSURE OF THE LUMINESCENCE TRANSITIONS OF CORUNDUM DOPED WITH MN4+

The effect of high pressure (up to 10 GPa) on the emission spectrum of alpha-Al2O3:Mn4+ was studied. It is shown that R1[E-2((E) over bar)-- >(4)A(2)] and R2[E-2(2 (A) over bar)-->(4)A(2)] spectral lines tend to shift linearly to red. The sensitivity of R1 and R2 upon pressure in alpha-Al2O3:Mn4+ is greater than in ruby. The position of the R1 and R 2 lines was calculated assuming that these effects are due to a decrea se in the interionic distance at the high pressure. Results of calcula tion agree well with all experimental data over a considered pressure range (disagreement less than 0.07%).