Abstract
A modified Judd–Ofelt theory is used in this paper to treat the electric dipole transitions within the4f2 configurationof Pr3+ by considering two main perturbing components of 4f5d and4fn′g. Through the energy-level calculation and standard tensorialanalysis, the explicit distance between the 4f5d configuration and the 1S0 state andother lower 4f2 energy levels are determined. The rare-earth ionPr3+ substitutedat Sr2+ sites inSrAl12O19 (SAO) andCa2+ sites inCaAl12O19 (CAO) has the sitesymmetry of D3h. The standardJudd–Ofelt parameters A332, A334,A534,A536,A736 are included in the calculation, together with odd-λ parametersA333 andA535. The emitting line intensities originating from 1S0 and3P0 are then calculated. Compared with the experimental measurements, the modified modelyields better results than the standard Judd–Ofelt theory.
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