Mn~(2+) 3d Luminescence Kinetics in Zn_(1-x)Mn_xSe

摘要

Intracenter luminescence (IL) of Mn~(2+) in Zn_(1-x)Mn_xSe (x = 0.07, 0.02) was studied under pulsed excitation by the neodymium laser second harmonic. At 4 K, the IL saturatin originates from the nonlinearity of the system only at the instant of excitation, the IL decay kinetics after the exciting pulse termination depending only weakly on the pumping level. At 77 K, the decay kinetics in Zn_(0.93)Mn_(0.07) Se depends substantially on the pumping level, because the migration of intracenter excitation over the manganese ions initiates up-conversion, which is a slow nonlinear process. As shown by IL decay measurements in Zn_(0.98)Mn_(0.02)Se (x = 0.02), excitation migration over the Mn~(2+) ions is insignificant even at a high temperature and under strong optical pumping.