Preparation and luminescent properties of BaCa 2Si 3O 9:Eu 2+

Abstract

A blue emitting phosphor of the triclinic BaCa 2Si 3O 9:Eu 2+ was prepared by the combustion-assisted synthesis method and an efficient blue emission ranging from the ultraviolet to visible was observed. The luminescence and crystallinity were investigated using luminescence spectrometry and X-ray diffractometry (XRD), respectively. The emission spectrum shows a single intensive band centered at 445 nm, which corresponds to the 4f 65d 1→4f 7 transition of Eu 2+. The excitation spectrum is a broad extending from 260 to 450 nm, which matches the emission of ultraviolet light-emitting diodes (UV-LEDs). The critical quenching concentration of Eu 2+ in BaCa 2Si 3O 9:Eu 2+ phosphor is about 0.05 mol. The corresponding concentration quenching mechanism is verified to be a dipole–dipole interaction. The CIE of the optimized sample Ba 0.95Ca 2Si 3O 9:Eu 0.05 2+ was ( x, y)=(0.164, 0.111). The result indicates that BaCa 2Si 3O 9:Eu 2+ can be potentially useful as a UV radiation-converting phosphor for white light-emitting diodes (LEDs).