Abstract
A green emitting phosphor of the orthorhombic BaZn 2Si 2O 7:Eu 2+ was prepared by the combustion-assisted synthesis method and an efficient green emission under near-ultraviolet was observed. The luminescence and crystallinity were investigated by using luminescence spectrometry, X-ray diffractometry (XRD). The emission spectrum shows a single intensive band centered at 522 nm, which corresponds to the 4f6 5d 1 → 4f 7 transition of Eu 2+. The excitation spectrum is a broad extending from 260 to 465 nm, which matches the mission of ultraviolet light-emitting diodes (UV-LEDs). The critical quenching concentration of Eu 2+ in BaZn 2Si 2O 7:Eu 2+ phosphor is about 0.05. The corresponding concentration quenching mechanism is verified to be a dipole–dipole interaction. The chromaticity coordinates were obtained from the luminescence emission spectrum. The results indicate that BaZn 2Si 2O 7:Eu 2+ can be potentially useful as a UV radiation-converting phosphor for white light-emitting diodes (LEDs).
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