Ce3+Centres in Y3Al5O12(YAG) Single Crystals

The absorption spectra due to the 4 f →5 d transitions in Ce 3+ centres have been measured with the use of YAG:Ce 3+ single crystals with a lattice concentration [Ce 3+ ] L =(1.28±0.05)%. The data are almost independent of the spectral behaviour of a reference spectrum whose absorption constants are ∼2 cm -1 at the highest, since the absorption constants of 129 cm -1 and 50 cm -1 have been derived, relative to the reference spectrum, at the strongest peaks in the dγ and d e regions, respectively. The absorption area 32.3 cm -1 eV measured on the strongest dγ-band suggests that about a quarter of the Ce-concentration, [Ce 3+ ] M , added in the mixture of the starting powders is incorporated into [Ce 3+ ] L as YAG:Ce 3+ . It is found that the highest-energy lying d e band is located at 6.06 eV, in agreement with 6.07 0 eV for the corresponding band peak in the excitation spectrum and that the ratio of the absorption area of dγ to that of d e is nearly 2:3.