Abstract
Time-resolved studies of pulsed dc electroluminescence from ZnS:Mn, Cu-powder phosphors are reported. Emission bands from the orange Mn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> transition and a very broad band extending from 1.5 to 3.6 eV are detected. The broad band, attributed to higher conduction band transitions of hot electrons, is used as a probe of avalanching in the devices. Study of the onset of the Mn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> luminescence provides evidence for direct impact excitation of Mn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> ions. Current densities much higher than expected for uniform current flow are deduced from the rate of increase of luminescence rise transients.
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