Optical transitions, absorption intensities, and intermanifold emission cross sections of Pr~(3+)(4f~(2)) in Ca_(5)(PO_(4))_(3)F crystal host

摘要

A spectroscopic Judd-Ofelt investigation has been performed on Pr~(3+) ions doped in calcium fluorapatite, Ca_(5)(PO_(4))_(3)F, belonging to the apatite structure family. The standard Judd-Ofelt analysis was applied to the room temperature absorption intensities of Pr~(3+) transitions to determine the phenomenological intensity parameters: Ω_(2), Ω_(4), and Ω_(6). Values of the intensity parameters were subsequently used to determine the decay rates (emission probabilities), radiative lifetimes, and branching ratios of the principal intermanifold transitions of Pr~(3+) from the ~(3)P_(2), ~(1)D_(2), and ~(3)P_(0) manifold states to the lower-lying manifolds. In addition, the room temperature fluorescence lifetimes and emission cross sections of the ~(3)P_(2)→~(3)H_(5), ~(1)D_(2)→~(3)H_(4), and ~(3)P_(0)→~(3)F_(2) transitions were measured; these values were compared with those of Nd~(3+):yttritium-aluminum-garnet and Pr~(3+):Sr_(5)(PO_(4))_(3) (known as S-FAP).