Abstract
The transient emission spectrum and spectrally resolved decay rates are reported for room-temperature ZnS:Cu,Pb phosphor powder excited at 365 nm and stimulated at 700 nm with an 8-nsec full width at half maximum laser pulse. The transient emission spectrum contains bands due to the lead intra-atomic transition and the self-activated ZnS recombination spectrum. No emission due to copper is observed. Decay rates do not vary with wavelength and decay curves are not exponential. The data are interpreted using a qualitative model for excitation and transient stimulation in the phosphor.
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