Abstract
Ba2Ca(BO3)2∶Eu2+ phosphor was synthesized by a high temperature solid-state method.CaCO3(A.R),BaCO3(A.R),H3BO3(A.R) and Eu2O3(99.99%) were used as raw materials.Its crystal structure,luminescent characteristics and Commission International de l'Eclairage(CIE) chromaticity coordinates values were measured.Under the ultraviolet to visible light irradiation,Ba2Ca(BO3)2∶Eu2+ shows an asymmetrically single green emission band with a maximum at 537 nm,which corresponds to the 4f65d1→4f7 transition of Eu2+.The emission intensity of Ba2Ca(BO3)2∶Eu2+ was influenced by Eu2+ molefraction,at first,it increases with the increase of Eu2+ mole fraction,and reaches a maximum value at 2%Eu2+,then decreases with further increasing its concentration because of the concentration quenching effect.And the concentration quenching mechanism is verified to be dipole-dipole interaction.According to the crystal structure data and the experimental spectral data,the critical distances(Rc) can be obtained,and are 2.64 nm and 2.11 nm,respectively.Moreover,with increasing the Eu2+ doped content,the CIE chromaticity coordinates of the samples were slightly varied.For Ba2Ca(BO3)2∶2%Eu2+,the quantum efficiency is approximately 72%.
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