Calculating line intensities of 1S0 emission through standard and modified Judd-Ofelt theories in Pr(3+)-doped CaAl12O19 and SrAl12O19.

A modified Judd-Ofelt theory is used in this paper to treat the electric dipole transitions within the 4f(2) configuration of Pr(3+) by considering two main perturbing components of 4f5d and 4fn'g. Through the energy-level calculation and standard tensorial analysis, the explicit distance between the 4f5d configuration and the (1)S(0) state and other lower 4f(2) energy levels are determined. The rare-earth ion Pr(3+) substituted at Sr(2+) sites in SrAl(12)O(19) (SAO) and Ca(2+) sites in CaAl(12)O(19) (CAO) has the site symmetry of D(3h). The standard Judd-Ofelt parameters A(33)(2), A(33)(4), A(53)(4), A(53)(6), A(73)(6) are included in the calculation, together with odd-λ parameters A(33)(3) and A(53)(5). The emitting line intensities originating from (1)S(0) and (3)P(0) are then calculated. Compared with the experimental measurements, the modified model yields better results than the standard Judd-Ofelt theory.