Multiphonon transitions in LaAlO3 doped with rare earth ions

From radiative transitions rates in praseodymium, neodymium, erbium, holmium and thulium ions doped LaAlO3 and measured emission decay times multiphonon nonradiative transitions rates WMNR have been calculated. Radiative transition rates were determined in the frame of Judd–Ofelt theory. The data obtained were plotted in the function of energy gap ΔE and fitted by exponential function WMNR = B · exp(−α · ΔE), where B = 1.02 × 109 and α = 3.61 × 10−3. Fitting results show that multiphonon nonradiative transition rates are low comparing to other oxide crystals being similar to those of YAG.