Photoluminescent properties of Eu -Eu activated MAl Si O (M = Mg, Ca, Sr, Ba) phosphors prepared in air.

In this paper, MAl Si O :Eu /Eu (Eu + Eu = 2%, molar ratio; M = Mg, Ca, Sr, Ba; x = 0, 0.5, 1, 1.5, 2) phosphors with different SiO concentrations (the ratio of SiO to MAl O is n%, n = 0, 50, 100, 150, 200, respectively) were prepared by high-temperature solid-state reaction under atmospheric air conditions. Their structures and photoluminescent properties were systematically researched. The results indicate that Eu ions have been reduced and Eu ions are obtained in air through the self-reduction mechanism. The alkaline earth metal ions and doping SiO strongly affect the crystalline phase and photoluminescent properties of samples, including microstructures, relative intensity of Eu to Eu , location of emission lines/bands. It is interesting and important that the emission color and intensities of europium-doped various phosphors which consist of aluminosilicate matrices prepared under atmospheric air conditions could be modulated by changing the kinds of alkaline earth metal and the content of SiO .