Abstract
Through controlled removal of surface layers, it was found that surface chemical barriers are not responsible for electroluminescence in zinc sulflde phosphors. Polycrystalline phosphors are shown to be almost uniform with respect to chemical, physical, and electroluminescent properties as one passes from the surface into the crystallite bulk. Electron micrographs show the character of the particles as successive layers of phosphor surfaces are removed by acid etching. The experimental results at progressive stages of etching are interpreted in terms of an inefficient surface layer and of decreased particle size after etching. Regions capable of serving as the site of field intensification are held to exist throughout the volume of the particles.
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