Crystal field parameters for Eu3+ in KY3F1. II. Intensity parameters

Abstract

The relative intensities of the transitions occurring in the fluorescence spectrum of KY₃F₁₀: 1% Eu have been measured at 77 and 4 K. By using the computed eigenfunctions for each Stark level, the Judd–Ofelt theory is used for calculations of the electric dipole intensities. The nine phenomenological parameters allowed by the C_4v point site symmetry of the lanthanide in KY₃F₁₀ are obtained, showing a good simulation of the phenomena. They have been compared in some cases to a priori calculations. The multipolar character of the transition and the importance of the J‐mixing effect are underlined.