Abstract
Novel Ca0.2Zr0.8O1.8:Eu3+ phosphor is synthesized by high-temperature solid-state reaction method in air. Host Ca0.2Zr0.8O1.8 with excitation 310nm shows deep-blue broadband emission within the range 340–500nm owing to the Zr4+→O2− transition in [ZrO8] group. Ca0.2Zr0.8O1.8:Eu3+ phosphor with excitation 263 and 394nm emits reddish-orange light owing to the 5D0→7FJ (J=1, 2, 3, and 4) transitions of Eu3+ ion, and that with excitation 310nm shows a systematically varied hue from deep-blue to reddish-orange by changing Eu3+ ion concentration. Tunable emission and energy transfer are confirmed via spectral properties. The optimal Eu3+ concentration is ∼5mol% in Ca0.2Zr0.8O1.8:Eu3+ phosphor and the corresponding fluorescence lifetime is ∼1.994ms. The luminous mechanism is analyzed and explained by the simplified energy level diagrams of [ZrO8] group and Eu3+ ion in Ca0.2Zr0.8O1.8:Eu3+ phosphor.
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