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Study of Precipitated Phases in Mn 2+ Singly Doped KBr Crystals by Optical Spectroscopy and EPR
Author(s) -
de Lucas M. C. Marco,
Rodríguez F.,
Moreno M.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221720223
Subject(s) - luminescence , octahedron , electron paramagnetic resonance , materials science , doping , excitation , spectroscopy , crystallography , analytical chemistry (journal) , nuclear magnetic resonance , chemistry , optoelectronics , crystal structure , physics , quantum mechanics , chromatography
The aggregation states of Mn 2+ in KBr Mn 2+ doped crystals are investigated using optical techniques. Excitation and luminescence spectra as well as lifetimes are obtained as a function of temperature of different crystals. It is demonstrated that at least three different Mn 2+ precipitates are formed inside the KBr. Two of them contain MnBr 6 4‐ units with slightly distorted octahedral symmetries, while the third one involves two non‐equivalent tetrahedral MnBr 4 2‐ units. These centers exhibit a broad green luminescence band.