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Abstract
This work investigates the Mn 2+ electronic structure and photoluminescence (PL) in [(CH 3)4N]MnCl 3 (TMMC) and their variation with pressure by time-resolved excitation and emission measurements in the 0–15 GPa range. We show that both the crystal-field excitation and the corresponding PL bands experience large pressure redshifts, which are associated with the anisotropic crystal compressibility providing large axial ligand fields at the Mn 2+ site in TMMC. These variations are very large for the emission band, which shifts with pressure at a rate of 21 nm/GPa (50 meV/GPa), making TMMC suitable for using as a pressure gauge. We show that TMMC provides precise pressure determinations in low pressure ranges (MPa–GPa), since it has the capability to detect pressure variations of 10 MPa.
Acknowledgements
Financial support from the Spanish MEC (Project No. MAT2008-06873-C02-01/MAT) and MALTA INGENIO-CONSOLIDER 2010 (Ref. CDS2007-0045) are acknowledged. L.N. thanks financial support from a Postdoctoral fellowship from the University of Cantabria.