The coexistence of sharp R-lines from the 2E state and the broad band from the 4T2 state in the photoluminescence spectra of Cr3+:Gd3Sc2Ga3O12 (GSGG) and Cr3+:Y3Ga5O12 (YGG) is observed at low temperature (10K). The decay lifetimes of the broad emission bands of Cr3+ in GSGG and YGG are very close to those of the R-lines being, respectively, 0.23 ms and 2.5 ms. These results are explained in terms of the extent of the mixing of the 4T2 vibronic wavefunction with that of the 2E lowest excited state by tunnelling.
|Number of pages||5|
|Journal||Applied Physics B Photophysics and Laser Chemistry|
|Publication status||Published - 1 Aug 1990|
- garnet crystals
- photoluminescence spectra
- luminescence decay