Luminescent properties of Ca2MgSi2O7 phosphor activated by Eu2+, Dy3+ and Nd3+

Long lasting alkaline earth silicates, Ca2MgSi2O7:Eu,Dy,Nd was prepared under a reduction atmosphere through solid,late reaction. The obtained phosphor was characterized by means of X-ray diffraction (XRD) and photoluminescence spectrum (PLS). The crystal structure of Ca2MgSi2O7:Eu,Dy,Nd phosphor was refined by Rietveld analysis. The obtained Ca2MgSi2O7:Eu,Dy,Nd phosphor showed a yellow-green emission peaking at 518 nm, which is ascribed to the luminescent emission of the Eu2+ that occupied the octa-coordinated Ca2+ sites in the Ca2MgSi2O7 host. The electron affinity (ea) value for Eu2+ in [EuO8] was calculated to 1.9 eV. The decay profile and the emission spectrum indicated that when the value of Dy/Eu is increasing, there is a concentration quenching of Eu2+. (C) 2004 Elsevier B.V. All rights reserved.