Preparation and Fluorescence Properties of(Y,Gd,Zr)2O3+δ∶Eu Nanopowders and Transparent Ceramics
In this study,(Y,Gd,Zr)2O3+δ∶Eu(YGO∶Eu)transparent ceramics were prepared by solid-phase synthesis of powders combined with vacuum sintering.The influence of Eu3+and Gd3+doping content on the phase structure,optical properties,and luminescent properties of powders and ceramics were systematically studied.The results exhibit that when the Eu3+doping content is 5％,the properties of[(Y0.95-yGdyZr0.05)0.95Eu0.05]2O3+δ(y=0.25～0.95)powders and ceramics can be improved by further adjusting the doping amount of Gd3+.The ceramic maintains a cubic structure when the content of Gd3+is 0.25≤y≤0.5 and the highest optical transmittance is achieved at y=0.3.Under the excitation of λex=466 nm,the 5D0→7F2 emission intensity of[(Y0.95-yGdyZr0.05)0.95 Eu0.05]2O3+δ(y=0.3)ceramic intensity is higher than that of[(Y0.95-yGdyZr0.05)0.95Eu0.05]2O3+δ(y=0.25)ceramic.Atλem=612 nm,the PLE(photoluminescence excitation)intensity of the[(Y0.95-yGdyZr0.05)0.95Eu0.05]2O3+δ(y=0.3)ce-ramic reaches the maximum.With the increase of Gd3+content,charge transfer band(CTB)red shifts.The 4f→4f transition intensity of ceramics is higher than that of CTB,and the energy level transition at 396 and 466 nm matches the emission wavelength of near-ultraviolet and blue LED chips,indicating that[(Y0.95-yGdyZr0.05)0.95Eu0.05]2O3+δ(y=0.3)transparent ceramic can be used in the white LED field.
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