Abstract
Energy transfer from Eu2+ to Tb3+ is an efficient strategy to boost the luminescence of Tb3+ in many hosts. In this study, series of Eu2+/Tb3+ co-activated NaMgPO4 phosphors are synthesized. Under near ultraviolet (NUV) excitation, Eu2+ and Tb3+ co-doped NaMgPO4 phosphors show tunable emitting color from blue to green via the energy transfer from Eu2+ to Tb3+. Interestingly, the enhanced blue emission from Eu2+ is observed with codoping Tb3+ ions and the quantum efficiency of NaMgPO4:Eu2+ increases to three times. Photo-luminescence spectra and photo-phosphorescence spectra indicates the coexistence of Eu2+ and Eu3+. Substituting Tb3+ at the Na+ site generates positive charge defects, promotes the transformation of Eu3+, increases the effective concentration of Eu2+ ions, and enhances the emission of Eu2+ finally. The strategy clarified in this study might work for other Eu2+/Tb3+ codoped phosphors.
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