Structure-Composition Relationships and Tunable Luminescence Properties in Eu~(2+)-activated Sr_8(Mg,Zn)La(PO_4)_7 Phosphors

摘要

Luminescence properties of Srg(Mg,Zn)La(PO_4)_7:Eu~(2+) 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 Sr_8MgLa(PO_4)_7 and Sr_8ZnLa(PO_4)_7 are hosts for Eu~(2+) 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 Zn~(2+), respectively. The Eu~(2+) activated Sr_8(Mg,Zn)La(PO_4)_7 phosphor has potential applications as a UV radiation-converting phosphors for white LEDs.