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Photoluminescence of Mn 2+ Centers in Chalcohalide Glasses
Author(s) -
Yan Qiqi,
Liu Yinyao,
Chen Guorong,
Da Ning,
Wondraczek Lothar
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04356.x
Subject(s) - photoluminescence , luminescence , octahedron , doping , materials science , broad band , excitation , analytical chemistry (journal) , optoelectronics , mineralogy , chemistry , optics , crystallography , crystal structure , physics , chromatography , quantum mechanics
We report on photoluminescence from Mn 2+ ‐doped chalcohalide glasses of the GeS 2 –Ga 2 S 3 –CsCl system. Upon blue excitation at 447 nm, a broad emission band occurs in the green spectral range from 500 to 600 nm, indicating the presence of tetrahedrally coordinated Mn 2+ species. When the Mn 2+ ‐concentration is increased up to 2 mol%, an increasingly intense secondary emission band evolves at about 610–660 nm. Meanwhile, the intensity of the green band decreases gradually and shifts toward the red, resulting a very flatten luminescence from 500 to 750 nm, which provides a promising white light emitting source. As for the origin of this unique luminescence behavior of Mn 2+ , it is proposed that the ligand coordination number of Mn 2+ in the present chalcohalide glasses experiences a partial change from tetrahedral to octahedral coordination.