Pressure-induced photoluminescence in Mn2+-doped BaF2 and SrF2 fluorites

摘要: This work reports an effective way for inducing room temperature photoluminescence (PL) in Mn 2 + -doped BaF and SrF using high-pressure techniques. The aim is to understand the surprising PL behavior exhibited by at cubal site of fluorite structure. While CaF shows a green with quantum yield close 1 temperature, MF (M=Ba,Sr) not either (SrF ) or any (BaF ambient pressure. We associate loss on passing from nonradiative multiphonon relaxation whose thermal activation energy decreases along series → . A salient feature this deals increase induced It leads enhancement, which favors recovery. Furthermore, mainly depends crystal volume per molecule irrespective structure local symmetry around impurity. In way, relevance fluorite-to-cotunnite phase transition analyzed connection properties investigated compounds. spectrum corresponding lifetime are reported both structural phases as function