Energy transfer processes of Nd3+ in Y2O3 ceramic

The paper presents the results on the energy transfer processes of Nd3+ doped Y2O3 transparent polycrystalline ceramics. The F-4(3/2) decays are highly non-exponential at concentrations larger than 0.1 at%. For concentrations up to 3 at% the emission kinetics can be described in terms of a static cross-relaxation (calculated by using the discrete structure and two types of interactions-short range and dipole-dipole) plus a migration term. Only C-2 sites are considered in the quenching. The transfer parameters that describe coherently the decays up to 3 at% are determined. The high concentration effects and the concentration dependence of the quantum efficiency are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.