High pressure optical studies of LMA:Mn2+, Nd3+ and LMA:Mn2+

This study considers effects of pressure of up to 110 kbar on line position and fluorescence lifetime τ for 4T1 → 6A1 transition in LMA:Mn2+ and LMA:Mn2+, Nd3+. Energy transfer between Mn2+and Nd3+ in LMA:Mn2+, Nd3+ has also been considered. Results indicate pressure induced line shift towards longer wavelengths, a red-shift in both crystals with the same rate of 0.182 nm kbar−1. Pressure influences fluorescence lifetime τ in the considered crystals differently; whereas for LMA:Mn2+ increasing pressure causes slow linear decrease of τ, and for LMA:Mn2+, Nd3+τ increases linearly as pressure raises. Energy transfer efficiencies decrease with pressure. High pressure induced red-shift can be explained by a simple model.