A new emission band of Eu2+ and its efficient energy transfer to Mn2+ in Sr2Mg3P4O15:Mn2+, Eu2+

Abstract

Eu²⁺ singly and Eu²⁺, Mn²⁺ co-doped Sr₂Mg₃P₄O₁₅ exhibit not only the well known blue emission band of Eu²⁺ peaking at 448 nm but also a new band at 399 nm in violet. They are attributed to Eu²⁺ on different Sr²⁺ sites. The Eu²⁺ for the violet band can transfer energy to the red emitting Mn²⁺ more efficiently than Eu²⁺ for the blue band. The new Eu²⁺ band could enable Sr₂Mg₃P₄O₁₅:Mn²⁺, Eu²⁺ to be a promising phosphor for enriching the red component of white LEDs.