Characteristics of concentration quenching of luminescence from the 4S3/2 level of the Er3+ ion in a (Y1 – xErx)3Al2O5 crystal

An experimental investigation was made of nonradiative relaxation of the excitation from the ⁴S_3/2 level of the Er³⁺ ion in Y₃Al₅O₁₂. It was found that quenching of the excitation from the ⁴S_3/2 level cannot be described using a single microparameter at all stages of the excitation decay process.