Manganese-doped metal-silicon-nitrides phosphors

摘要

Mn-doped M 2 Si 5 N 8 (M = Ca, Sr, Ba) phosphors have been prepared by a solid state reaction method at high temperature and their photoluminescence properties were investigated. The Mn 2+ -activated M 2 Si 5 N 8 phosphors exhibit narrow emission bands in the wavelength range of 500-700 nm with peak centers at about 599, 606 and 567 nm for M = Ca, Sr, Ba, respectively, due to the 4 T 1 ( 4 G)? 6 A 1 ( 6 S) transition of Mn 2+ . The long-wavelength excitation and emission of Mn 2+ ions in the host of M 2 Si 5 N 8 are attributed to the effect of a strong crystal field of Mn 2+ in the nitrogen environment. It is observed that there exists energy transfer between M 2 Si 5 N 8 host lattice and activator (Mn 2+ ). The potential applications of these phosphors have been pointed out.