A novel green-emitting phosphor Ca10Na(PO4)7:Eu2+ for near ultraviolet white light-emitting diodes

A novel green phosphor Ca10Na(PO4)(7):Eu2+ was synthesized by the solid state reaction. The crystal structure, photoluminescence properties and concentration quenching of the as-prepared Ca10Na(PO4)(7):Eu2+ phosphor were systematically investigated. The phosphors show trigonal structure and the optimal Eu2+ concentration in Ca10Na(PO4)(7):xEu(2+) is 0.075. The phosphors present two broad emission bands from 380 to 710 nm in which the peak profiles actually centered at about 412 and 531 nm under the near ultraviolet excitation of 400 nm. The calculated results indicate that the mechanism for concentration quenching of fluorescence emission of Eu2+ ions in Ca10Na(PO4)(7) phosphor is the dipole-dipole interaction. All the present work suggests that Ca10Na(PO4)(7):Eu2+ phosphor is a potential green-emitting phosphor for near ultraviolet white light-emitting diodes. (C) 2013 Elsevier B.V. All rights reserved.