Abstract
The electron–phonon (EP) coupling of the 2 E→ 4 A 2 -emission from Cr 3+ has been measured for the aluminum garnet Y 3Al 5O 12 (YAG) and the gallium garnet Y 3Ga 5O 12 (YGG) using three different methods; determination of the vibronic transition probability A vib from the decay time τ and the ratio between the vibronic- and zero-phonon line intensity (1), temperature-dependent line-broadening resulting in a strength parameter α ̄ (2) and temperature-dependent line shift measurements, resulting in an electron–phonon coupling strength parameter α (3). All three methods show a stronger EP coupling for the gallium garnet YGG compared to the aluminium garnet YAG. This increase in EP coupling is explained by an increase in covalency in the gallium garnet compared to the aluminium garnet, which results in larger overlap of electron wave functions of the transition metal ion Cr 3+ with the ligands. Also lowering of the 4 T 2 state going from Cr 3+-doped YAG to YGG could give a contribution to the increase of EP coupling for YGG : Cr 3+.
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