Photoluminescent properties of the monoclinic Ba2MgSi2O7:Eu2+ phosphor prepared by the combustion-assisted synthesis method

A blue-green emitting phosphor of the monoclinic Ba2MgSi2O7: Eu2+ was prepared by the combustion-assisted synthesis method and an efficient bluish-green emission under from ultraviolet to visible light was observed. The luminescence, crystallinity and particle sizes were investigated by using luminescence spectrometry, X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The emission spectrum shows a single intensive band centered at 498 nm, which corresponds to the 4f(6)5d(1)-> 4f(7) transition of Eu2+. The excitation spectrum is a broad extending from 260 to 465 nm, which matches the emission of ultraviolet light-emitting diodes (UV-LEDs). The critical quenching concentration of Eu2+ in Ba2MgSi2O7: Eu2+ phosphor is about 0.05 mol. The corresponding concentration quenching mechanism is verified to be a dipole-dipole interaction. The result indicates that Ba2MgSi2O7: Eu2+ can be potentially useful as a UV radiation- converting phosphor for white light-emitting diodes (LEDs). (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim