Effect of Sr2+-doping on structure and luminescence properties of BaAl2Si2O8:Eu2+ phosphors

Sr2+ doped BaAl2Si2O8:Eu2+ phosphor was synthesized by chemical co-precipitation method. With the increase of Sr2+ concentration, the phase structure of (Ba0.965-xSrxEu0.035)Al2Si2O8 changes from hexagonal phase to monoclinic phase owing to large activation energy in SrAl2Si2O8 system. (Ba0.965-xSrxEu0.035) Al2Si2O8 phosphor exhibits a broad blue band peaking at 425 nm due to the 4f(6)5d-4f(7)(S-8(7/2)) transition of Eu2+ ions. The emission intensity increases, accompanied by the blue shift of emission maximum from 459 to 417 nm with the Sr2+ doping concentration increasing. The optimal concentration of Sr2+ ion is 40%, and the phosphor shows high color stability in CIE chromaticity diagram. The result indicates that Sr2+ doped phosphor not only can enhance the relative intensity but also can adjust the chromaticity coordinate. (C) 2011 Elsevier B.V. All rights reserved.