Optical spectroscopy of Eu3+ ions doped in YAl3 (BO3)4 crystal

The electronic structure of Eu3+ ions doped in YAl3 (BO3)4 crystal are investigated by means of room temperature absorption and emission spectroscopy in the 15,000-30,000 cm−1 range. The observed transitions are assigned and analyzed on the basis of group theory assuming that Eu3+ ion occupies a D3 symmetry site. Eu3+ Free-ion energy diagram is presented and the corresponding free ion parameters are calculated. Calorimetric parameters of the Eu3+ ions red emission in YAB are calculated (x=0.67, y=0.32). The Judd-Ofelt parameterization is applied to the analysis of the room temperature absorption and emission spectra. The intensities parameters are determined as: Ω2=2.26×10-20 cm2, Ω4=5.11×10-20 cm2 and Ω6=0.78×10-20 cm2. These parameters are used to calculate, the line strength, radiative transition probability, fluorescence, branching ratio and radiative lifetime. The calculated 5D0 radiative life time around 3.6 ms is compared with the experimental value. The calculated quantum efficiency is about 35%.