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.