Yttrium aluminium garnet (YAG) doped with Eu²⁺ and Eu³⁺ ions is very interesting as a phosphor for conversion of light-emitting diode light for white light sources. Europium ion occupies the structural position of yttrium in yttrium aluminium garnet and has valence state Eu³⁺. Our sample was doped with Zr⁴⁺, that is why part of europium ions had valence state Eu²⁺. As a rule luminescence of Eu³⁺ ions is observed in orange and red range of spectrum. The luminescence of Eu²⁺ in yttrium aluminium garnet is characterized by intensive broad band with maximum of intensity at about 560 nm (green color). In this work it was studied the intensity and decay time dependences on europium concentration, and the influence of excitation power density on cathodoluminescence of the sample. The more interesting result is the change of visible cathodoluminescence color in dependence on the density of exciting power. PACS: 78.60.Hk, 71.55.Ht, 78.47.+p, 85.60.Jb

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