Luminescence and Energy Transfer of Eu²⁺, Mn²⁺ in SrZnP₂O₇

The SrZnP₂O₇:Eu²⁺, Mn²⁺ phosphor is synthesized by high temperature solid state reaction. The luminescence properties and the energy transfer between Eu²⁺ and Mn²⁺ are investigated. The emission bands of this phosphor peaked at 420nm and 670nm are originated from the 5d→4f transition of Eu²⁺ and from the ⁴T₁ (⁴G) →⁶A₁ (⁶) transition of Mn²⁺, respectively. With the increasing Mn²⁺ concentration, the intensity of fixed concentration Eu²⁺ decreases and the intensity of Mn²⁺ also increases. It is suggested that
there is an energy transfer from Eu²⁺ to Mn²⁺ in SrZnP₂O₇ host. According to Dexter's energy transfer formula of multipolar interaction, the energy transfer between Eu²⁺ and Mn²⁺ is due to the electric dipole-quadrupole interaction of the resonance transfer.