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The Ca2SiO4:Dy3 phosphor was synthesized by the high temperature solid-state reaction method in air. The emission spectrum of Ca2SiO4:Dy3 phosphor shows several bands at 486, 575, and 665 nm under the 365-nm excitation. The effects of Li , Na , and K on the emission spectrum of Ca2SiO4:Dy3 phosphor were studied. The results show that the emission spectrum intensity is greatly influenced by Li , Na , and K . The charge compensation concentration corresponding to the maximum emission intensity is different with different charge compensations.