Abstract: The fluorescence of Eu²⁺and Mn²⁺coactivated SrMgP₂O₇was reported.The emission bands of Eu²⁺and Mn²⁺peaking at 400 nm and 670 nm were originated from 5d-4f transition of Eu²⁺and ⁴T₁(⁴G)-⁶A_lg(⁶S) transition of Mn²⁺,respectively. The dependence of Eu²⁺and Mn²⁺luminescence properties on their concentration was investigated.The emission of Mn²⁺is sensitized by Eu²⁺and the fluorescence lifetime of Eu ²⁺is affected by Mn²⁺.The experimental results indicate that there exists an effective energy transfer from Eu²⁺to Mn²⁺in SrMgP₂O₇host.This energy transfer is due to the electric dipole-quadripole interaction of the resonance transfer.

Key words: Luminescence, Fluorescence lifetime, Energy transfer