The optical spectra of Ca3Sc2Ge3O12 (CaSGG) single crystals doped with Ni2+ are presented. Analysis of the absorption spectrum shows that the dopant substitutes mainly for Sc3+ in octahedral sites and, to a lesser extent, Ge4+ in tetrahedral sites. The optical transitions were assigned in the framework of the Ligand Field theory and the Dq, B and C parameters were obtained for both coordination geometries. Three emission transitions were observed in the green, red and infrared regions and were assigned to the T-1(2)(D-1) -->( 3)A(2)(F-3); T-1(2)(D-1) --> T-3(2)(F-3) and T-3(2)(F-3) --> (3)A(2)(F-3) transitions of Ni2+ in octahedral sites, respectively. No luminescence from Ni2+ in tetrahedral sites was observed. (C) 1999 Elsevier Science Ltd. All rights reserved.

Optical spectroscopy of Ca3Sc2Ge3O12 : Ni2+

TONCELLI, ALESSANDRA;TONELLI, MAURO;
1999

Abstract

The optical spectra of Ca3Sc2Ge3O12 (CaSGG) single crystals doped with Ni2+ are presented. Analysis of the absorption spectrum shows that the dopant substitutes mainly for Sc3+ in octahedral sites and, to a lesser extent, Ge4+ in tetrahedral sites. The optical transitions were assigned in the framework of the Ligand Field theory and the Dq, B and C parameters were obtained for both coordination geometries. Three emission transitions were observed in the green, red and infrared regions and were assigned to the T-1(2)(D-1) -->( 3)A(2)(F-3); T-1(2)(D-1) --> T-3(2)(F-3) and T-3(2)(F-3) --> (3)A(2)(F-3) transitions of Ni2+ in octahedral sites, respectively. No luminescence from Ni2+ in tetrahedral sites was observed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Zannoni, E; Cavalli, E; Toncelli, Alessandra; Tonelli, Mauro; Bettinelli, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/190752
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