This paper discusses how the cathodoluminescence intensity of europium-doped solid solutions of (YGd)<sub>2</sub>O<sub>3</sub> in the range of accelerating voltages 300-1000 V depends on the energy and calculated values of the penetration depth of primary electrons into a layer of luminescent material. The thickness of the "dead" layer is determined to be 9-11 nm, and it is shown that it depends on the conditions under which the solid solutions are synthesized. It follows from these results that it is necessary to use different compositions of the phosphor matrix, depending on the accelerating voltage applied to the display. © 2005 Optical Society of America

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