High pressure investigation of the LLGG:Cr ³⁺ crystals after heat treatment

Abstract

A 2 transition. Analysis of the R 1 line structure allowed distinguishing five nonequivalent Cr 3+ sites. It has been also found that annealing in H 2 atmosphere caused increase of the crystal field strength 10Dq and/or decrease of electron-lattice coupling in all Cr 3+ sites with respect to as grown material.

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.…”

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

“…The crystal field experienced by dopant ions in lanthanum lutetium gallium garnet (LLGG : La 3 Lu 2 Ga 3 O 12 ) crystals is lower than in other garnets [1][2][3][4][5]. It is especially interesting for Cr 3+ ions, since the low strength of the crystal field profoundly affects the luminescence properties of this dopant [1,2] where B and C are Racah parameters and Dq the cubic crystal-field parameter.…”