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Crystal fields in Pr 3+ doped rare earth gallium garnets, RE 3 Ga 5 O 12 :Pr 3+

1992; IOP Publishing; Volume: 4; Issue: 43 Linguagem: Inglês

10.1088/0953-8984/4/43/007

1361-648X

Željka Antić, Jorma Hölsä, J.C. Krupa, M. Lemaı̂tre-Blaise, P. Porcher,

Lanthanide and Transition Metal Complexes

The optical absorption, site selective excitation and luminescence spectra of the trivalent praseodymium ion in three rare earth gallium garnet matrices, RE3Ga5O12 (REGG; RE=Y, Gd, and Pr) were detected at 4, 77 and 300 K. The 4f2 energy level schemes comprising 56 to 68 crystal field (CF) sublevels were simulated according to a phenomenological model taking into account both the free ion and CF effects. The model consisting of 17 parameters with 8 free ion and 9 CF parameters appropriate to the D2 point symmetry of the RE3+ site reproduced the experimental energy level schemes in a satisfactory manner with RMS deviations between 17 and 23 cm-1. The CF parameters vary only slightly as a function of the host matrix. The Bqk parameter sets for PrGG and YGG:Pr3+ are consistent with those obtained for the other REGG and YGG:RE3+, respectively.