Abstract
The realization of Eu3+ reduction and its reduction mechanism have become focal points in the field of WLED phosphor research. In this study, the reduction of Eu3+ was successfully achieved through cationic substitution strategy by replacing Zr4+ with Hf4+ in Na2ZrSiO5:Eu3+. The effects of substituting Hf4+ for Zr4+ on the phase, crystal structure, and luminescence properties of Na2Zr1-xHfxSiO5:Eu0.03 (0 ≤ x ≤ 1) were thoroughly investigated based on Rietveld refinement, spectral data, DFT calculation and electronegativity of ions. Comprehensive consideration was given to the effect of site size change and site reducibility on Eu3+ reduction. The results demonstrate that the reduction of Eu3+ in Na2Zr1-xHfxSiO5:Eu0.03 is attributed to the alteration in inducible effect caused by cationic substitution and the enhancement in site reducibility rather than changes in site size. Therefore, the cationic substitution strategy based on induction effect presents a novel approach for achieving Eu3+ reduction and offers a new insight into developing and modifying Eu2+-activated phosphors.
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