Add time:08/03/2019         Source:sciencedirect.com

The aim of this work is to determine the activation experimental conditions of ZnS by thulium (Tm3+) as well as in polycrystalline (cubic or hexagonal) or in monocrystalline (cubic with some stacking faults) forms. The study of numerous fluorescence spectra, mainly in the region of the blue transition 1G4 → 3H6 has allowed us to describe a cationic site common to all the structures. This site is independant of the charge compensation and probably corresponds to Td symmetry with occasionally a C3v distorsion which is difficult to estimate.

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