Orange Emission in Eu3+-Activated Mg2M (PO4)2(M = Sr and KNa) and KSrPO4 Phosphors

Abstract

This work concerns the photoluminescence (PL) studies of intense orange emission in phosphate based phosphors doped with trivalent europium. The present compounds were prepared by combustion synthesis, and the completion of the synthesis was confirmed by X-ray diffraction (XRD) pattern. The PL emission spectrum of Eu3+ in Mg2M(PO4)2 (M = Sr and KNa) and KSrPO4 phosphors was observed at around 590 nm orange region. The spectrum is due to 5D0 → 7F1 transitions at near UV excitation, i.e., 391 nm. The 300–400 nm is Hg free excitation (Hg excitation is 85% 254 nm wavelength of light and 15% are other wavelengths), which is characteristic of solid-state lighting phosphors. Hence, intense orange PL emissions suggest the possibility of the potential of phosphate based phosphors in warm white LED phosphors.