Theoretical study of pressure shift for R line of Cr³⁺ ion in lanthanum lutetium gallium garnet

Abstract

The pressure shifts for R line ( 2 E → 4 A 2 transition) of Cr 3+ luminescence spectra in lanthanum lutetium gallium garnet (LLGG : La 3 Lu 2 Ga 3 O 12 ) are studied by a molecular orbital model. The obtained pressure dependence of R line is in qualitative agreement with experiments, this is an attempt to overcome the theoretical difficulty for the R line pressure shifts of Cr 3+ : LLGG within the crystal-field approximation. The anticrossing model and the assumed nephelauxetic effect for Cr 3+ ions in gallium garnets are mentioned.

Photoluminescence spectroscopy of Cr3+ in CaY2Mg2Ge3O12

“…1,2 Spectroscopic properties of Cr 3+ systems depend directly on the crystal-field ͑CF͒ strength ͑Dq/B͒ which determines the sequence of the two lowest excited states, the 2 E doublet and 4 T 2 quartet. [1][2][3][4][5][6][7][8][9][10] Unfortunately reports on germinate garnets are limited. 2 The energy separation ⌬ has a decisive effect on the Cr 3+ emission.…”