title: Pressure effect on the zero-phonon line emission of Mn(4+) in K2SiF6.
abstract: In this work, effects of pressure and temperature on the luminescent properties of the K2SiF6:Mn(4+) system have been presented. At ambient pressure, the luminescent spectrum of Mn(4+) consists of several lines at 610-650 nm attributed to phonon repetitions of the (2)Eg → (4)A2g transition and does not contain the zero phonon line (ZPL). At pressure above 9 kbar, an additional line at about 624 nm occurs, which can be attributed to the ZPL of the (2)Eg → (4)A2g transition in the Mn(4+) ions. This change in the emission spectra is accompanied by shortening of the luminescence decay time. Further increasing pressure up to 220 kbar causes the red shift of all emission lines. Upon releasing pressure, all observed lines are going back to their previous positions. The ZPL remains visible even at ambient pressure. Taking into account XRD and Raman spectra at ambient pressure before and after compression-decompression, we have attributed these changes to pressure-induced local structure change of MnF6 (2-) octahedron.
authors.affiliation: Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Lazarowska
authors.affiliation: Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland.
authors.forename: S
authors.initials: S
authors.lastname: Mahlik
authors.affiliation: Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Grinberg
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Chun Che
authors.initials: CC
authors.lastname: Lin
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu