Pressure-Induced Enhancement of the Photoluminescence in Ca 1−x Sr x F 2 :Mn 2+ |
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| Authors: | F Rodríguez I Hernández RE Gutiérrez S García-Revilla M Moreno R Alcalá |
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| Institution: | 1. DCITMAC. Facultad de Ciencias , Universidad de Cantabria , Santander , 39005 , Spain E-mail: rodriguf@unican.es;2. DCITMAC. Facultad de Ciencias , Universidad de Cantabria , Santander , 39005 , Spain;3. Departamento de Física de la Materia Condensada , Universidad de Zaragoza , Spain |
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| Abstract: | The surprising disappearance of the Mn 2+ photoluminescence (PL) on passing from CaF 2 to SrF 2 through the Ca 1 m x Sr x F 2 :Mn 2+ series is investigated through pressure spectroscopy, and as a function of the temperature. The PL quenching which is observed along the series is explained on the basis of multiphonon relaxation mechanisms, which are described by a thermally activated process. In non-luminescent crystals, PL can be recovered by applying pressure. The results are accounted for through an universal equation relating the PL lifetime as a function of P (or V ) and T , using an activation energy and a transition rate that are strongly dependent on the lattice parameter (crystal volume). |
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| Keywords: | High-pressure Spectroscopy Photoluminescence Radiationless Process Mn 2+ Fluorite Series |
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