Dependence of Judd-Ofelt parameters on overall changing factor of integrated absorption bands of Er3+

Dependences of Judd-Ofelt (JO) intensity parameters Omega(t) (t = 2,4,6) and their relative ratios (Omega(4)/Omega(2) and Omega(6)/Omega(2)) on overall changing factor (q) of integrated absorption bands of Er3+ have been studied theoretically. These dependences can help us to use relevant method to correctly extract Ot of a powder material. The study was done by exemplifying the widely studied Er3+ system, which is doped into Gd3Ga5O12, LiNbO3 and SrGdGa3O7 bulk single-crystals and beta-NaYF4 crystalline powder. The results show that the Omega(t) changes linearly with the overall changing factor q: Omega(t) = gamma(t)q + xi(t). The linear feature changes from one material to another. The magnetic-dipole oscillator of the 1.5 mu m transition results in non-zero nodal increment xi(t) and hence dramatical changes of the relative ratios Omega(4)/Omega(2) and Omega(6)/Omega(2) (with q) in smaller q region. The dramatical feature limits application of the relevant method for Omega(t) calibration of a luminescent powder. To get the precise Omega(t) values using the relevant method, the q value must be large enough. This can be realized by adopting a thin powder plate with a low Er3+ concentration for spectral measurement.

Automated summary

The dependence of Judd-Ofelt intensity parameters and their relative ratios on the overall changing factor of integrated absorption bands of Er3+ has been studied. The linear feature changes between different materials, and the relative ratios show significant changes in smaller q regions due to the presence of the magnetic-dipole oscillator. To obtain precise Omega(t) values using the relevant method, a large enough q value is necessary, which can be achieved by using a thin powder plate with low Er3+ concentration for spectral measurement.