Structure-Composition Relationships and Tunable Luminescence Properties in Eu2+ -activated Sr8(Mg,Zn)La(PO4)7 Phosphors

Luminescence properties of Sr-8(Mg,Zn)La(PO4)(7):Eu2+ phosphors were investigated by changing the content of Zn substitution. The Zn substitution was confirmed to change the crystallinity and luminescence properties of the phosphors. A eutectic mixture of two iso-structural compounds from Sr8MgLa(PO4)(7) and Sr8ZnLa(PO4)(7) are hosts for Eu2+ activator ions, allowing for carefully tuning the various parameters associated with efficient solid state white lighting. The phosphors exhibit systematically varied hues from yellow toward white and eventually to blue and the relative intensity of yellow and blue emissions can be adjusting the concentration of Zn2+, respectively. The Eu2+ activated Sr-8(Mg,Zn)La(PO4)(7) phosphor has potential applications as a UV radiation-converting phosphors for white LEDs. (C) 2014 The Electrochemical Society. All rights reserved.