Two-color emitting of Eu²⁺ and Mn²⁺ co-doped Sr₂Mg₃P₄O₁₅ for UV LEDs

The compound Sr₂Mg₃P₄O₁₅ singly and doubly doped with Eu²⁺ and Mn²⁺ was investigated. Phosphor Sr₂Mg₃P₄O₁₅:Eu²⁺, Mn²⁺ shows a broad blue emission band and a red emission band, which originates from the Eu²⁺ occupying the Sr²⁺ sites and the Mn²⁺ occupying the Mg²⁺ sites, respectively. The resonant type energy transfer from Eu²⁺ to Mn²⁺ was demonstrated, and the energy transfer efficiency was also calculated according to their PL spectra. Based on the principle of energy transfer, the PL intensity ratio of Eu²⁺ and Mn²⁺ could be appropriately tuned by adjusting the contents of activators. We also illuminated that the phosphor Sr₂Mg₃P₄O₁₅:Eu²⁺, Mn²⁺ could be used as a potential candidate for blue and red double color emitting phosphor in near-UV white light-emitting diodes (LEDs).