Comparison Between Standard and Modified Judd-Ofelt Theories in a Pr³⁺-Doped Fluoride Glass

Abstract

Α method which takes into account normalized oscillator strengths is detailed for the calculation of parameters in Judd-Ofelt theory (B.R. Judd, Phys. Rev. 127, 750 (1962), G.S. Ofelt, J. Chem. Phys. 37, 511 (1962) Solidi B 157, 267 (1990)) are also considered but do not improve the calculated intensities when the energy of the 5d level is set to its experimentally determined value. Finally, in connection with 1.3 μm amplification, the 1.3 hn1 reabsorption ( 1i.4 → 1D2) oscillator strength is computed from the various models as well as the 1.3 /im emission branching ratio ( 1G4 --> 3H5/ 1G4 -3H6). The best agreement with experiment is obtained with the standard Judd-Ofelt theory.

Spectroscopic characterization of LaALO3 crystal doped with Pr3+ ions

“…In our calculations, we use the normalized oscillator strength approach, in which the contribution of the 5d band is taken into account [8,9]. In this method the calculated oscillator strength is corrected by the G parameter:…”

Coating Red Phosphor on Green Luminescent Material for Multi-Mode Luminescence and Advanced Anti-Counterfeit Applications

“…The ratio of C 2 to S 6 is 3:1 (75% and 25% of the total Y 3+ ions occupied the C 2 and S 6 sites, respectively), and the Eu 3+ activators are expected to occupy these two sites in a statistical way upon replacing Y 3+ [17,22]. According to the Judd-Ofelt parity law [23,24], the magnetic dipole transition is permitted for f-f transitions due to the even parity of the magnetic dipole operator, while the electric dipole transition is allowed only when the Eu 3+ ions occupy sites in the absence of an inversion center, thus obtaining the mixed states of 4f states (odd parity) and d-f or f-g states (even parity). As the C 2 site has no center of inversion and has a statistically higher occupancy level (75%), the whole emission spectrum is thus dominated by the 613 nm red emission arising from Eu 3+ ions occupying the C 2 sites [17,18,21,22].…”