Photoluminescent properties of the monoclinic Ba_2MgSi_2O_7:Eu~(2+) phosphor prepared by the combustion-assisted synthesis method

摘要

A blue-green emitting phosphor of the monoclinic Ba_2MgSi_2O_7:Eu~(2+) was prepared by the combustion-assisted synthesis method and an efficient bluish-green emission under from ultraviolet to visible light was observed. The luminescence, cry stallinity 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~65d~l →4f~7 transition of Eu~(2+). 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 Eu~(2+) in Ba_2MgSi_2O_7:Eu~(2+) phosphor is about 0.05 mol. The corresponding concentration quenching mechanism is verified to be a dipole-dipole interaction. The result indicates that Ba_2MgSi_2O_7:Eu~(2+) can be potentially useful as a UV radiation-converting phosphor for white light-emitting diodes (LEDs).