Abstract
Pulsed excitation and emission data are reported for ZnS : Mn using UV wavelenghts below and above the bandgap. The data are interpreted to be consistent with donor-acceptor (DA) recombination proceeding simultaneously with Mn intra-atomic emission. Mn excitation occurs primarily through resonance energy transfer. The temperature dependence of the emission spectra shows dramatic differences depending on the UV photon energy relative to the bandgap. Luminescence decay is not exponential for both DA and Mn emission, and it is observed that DA emission is extinguished well before the Mn emission. The dependence of the emission on pump intensity is found to be nonlinear both below and above the bandgap for high pump fluence, and linear for low pump fluence. With the crystal placed in a resonator, no evidence of stimulated emission was observed. This is interpreted as being primarily due to the low optical conversion efficiency of the pump light to 580 nm emission.
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