Abstract
Processes of energy relaxation from the 4G7/2 and 2F(2)5/2 levels of Nd3+ ions in yttrium oxide crystals Y2O3, YA103 and Y3AI5O12 are discussed in this paper. It was found out that energy relaxation from the 4G7/2 level with minimal energy gap to the first lower lying manifold 1200 cm −1 is predominantly nonradiative with very high multiphonon relaxation rate 108 – 109 s−1. The increase of nonradiative relaxation probability in studied crystals is in a good agreement with increase of phonon frequency cut-off of the crystal matrix. For the first time the luminescence spectra on the transitions from the 4G7/2 level were measured in oxide crystals.
© 1991 Optical Society of America
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