Ca2Al3O6F:Eu2+: a green-emitting oxyfluoride phosphor for white light-emitting diodes

Abstract

A novel green-emitting phosphor Ca2Al3O6F:Eu2+ was synthesized and its photoluminescence (PL) properties were investigated for application in white light-emitting diodes (w-LEDs). This phosphor shows good absorption ranging from the ultraviolet to the blue region and a broad green emission band centered at 502 nm. The concentration quenching mechanism and fluorescence lifetime of Eu2+ emission in the Ca2Al3O6F:Eu2+ phosphors have been investigated. The key parameters for the fabrication of w-LED lamps, such as the temperature-dependent photoluminescence, microstructure and morphology, CIE value and quantum efficiency of Ca2Al3O6F:Eu2+ phosphors, have also been studied. The above results indicate that Ca2Al3O6F:Eu2+ is a good candidate as a green component for near UV-excited w-LEDs.