Enhancement of Mn4+ Emission by Means of Energy Transfer in Mg2Al4Si5O18:Dy3+, Mn4+ Phosphors

Abstract

We synthesized a series of Dy3+/Mn4+ doped Mg2Al4Si5O18 phosphors by sintering at 1400 °C. The phase and luminescence properties of the synthesized phosphors were investigated. The XRD results demonstrate that Dy3+ and Mn4+ have successfully entered into the Mg2Al4Si5O18 hosts and occupied crystallographic sites of the hosts. Mg2Al4Si5O18:Mn4+ and Mg2Al4Si5O18:Dy3+ phosphors respectively show emission bands corresponding to 2Eg → 4A2g transitions of Mn4+ and 4F9/2 → 6H15/2, 13/2, 11/2 transitions of Dy3+. For Dy3+ and Mn4+ codoped Mg2Al4Si5O18 phosphors, the emission bands originating from transitions of Dy3+ and Mn4+ are observed. The characteristics of intensity and lifetime of Dy3+ emission suggest Dy3+ → Mn4+ ET process in Dy3+ and Mn4+ codoped Mg2Al4Si5O18 phosphors.