Abstract
In this work, the luminescence efficiency and thermal stability of NaZr2(PO4)3:Eu2+ phosphors were significantly improved through Na+-Sc3+ ions substitution for Zr4+ ions. The evolutions of crystal structure and luminescent performances induced by Na+-Sc3+ ions substitution were investigated in details for Na1+xZr2-xScx(PO4)3:Eu2+ phosphors. The extra Na+ ions occupied the interstitial sites in NaZr2(PO4)3 lattice accompanied with the replacement of Zr4+ ions by Sc3+ ions, resulting in the increase of crystal structure density of materials. As a result, the displacement (ΔR) between the ground state and excited state of Eu2+ activators in the configuration coordinate diagram was decreased because of the increased crystal structure density induced by Na+-Sc3+ ions substitution, then leading to the significant improvement of luminescence efficiency and thermal stability. The presented study revealed that crystal structure density might be used a useful proxy in screening higher performance phosphors.
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