β-Zn3BPO7:Mn2+: A novel rare-earth-free possible deep-red emitting phosphor

Abstract

Novel rare-earth-free deep-red emitting phosphors, β-Zn3(1−x)Mn3xBPO7, were prepared successfully by high temperature solid-state reaction and their photoluminescence properties were investigated. The excitation spectrum consists of a broad excitation band peaking at 255nm and a group of line-shaped excitation peaks around 350nm and 500nm, which can be attributed to the charge transfer transition in Mn2+–O2− bonds and the inner d–d electron transitions of Mn2+ ion, respectively. The emission bands are due to 4T1(4G)→6A1(6S) transition of the Mn2+ ion and there exists efficient energy transfer from charge transfer state of Mn2+–O2− bonds to Mn2+ ions. The dependence of emission wavelength on Mn2+ concentration is studied. The decay curve of Mn2+ ions luminescence in β-Zn3BPO7:Mn2+ is also measured.