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dc.contributor.authorEngelsen, D-
dc.contributor.authorHarris, PG-
dc.contributor.authorIreland, TG-
dc.contributor.authorFern, G-
dc.contributor.authorSilver, J-
dc.identifier.citationUltramicroscopy, 157, pp. 27-34en_US
dc.description.abstractCathodoluminescence (CL) studies are reported on phosphors in a field emission scanning electron microscope (FESEM). ZnO: Zn and other luminescent powders manifest a bright ring around the periphery of the particles: this ring enhances the contrast. Additionally, particles resting on top of others are substantially brighter than underlying ones. These phenomena are explained in terms of the combined effects of electrons backscattered out of the particles, together with light absorption by the substrate. The contrast is found to be a function of the particle size and the energy of the primary electrons. Some phosphor materials exhibit a pronounced comet-like structure at high scan rates in a CL-image, because the particle continues to emit light after the electron beam has moved to a position without phosphor material. Image analysis has been used to study the loss of brightness along the tail and hence to determine the decay time of the materials. The effect of phosphor saturation on the determination of decay times by CL-microscopy was also investigated.en_US
dc.subjectPhosphor Powderen_US
dc.subjectSecondary Electronsen_US
dc.subjectBackscattered Electronsen_US
dc.subjectInteraction Volumeen_US
dc.titleContrast and decay of cathodoluminescence from phosphor particles in a scanning electron microscopeen_US
Appears in Collections:Wolfson Centre for Materials Processing

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