BiNbO4:RE3+ (RE = Dy, Eu, Sm, Tb) 형광체의 광학 특성
Photoluminescence Properties of BiNbO4:RE3+ (RE = Dy, Eu, Sm, Tb) Phosphors
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BiNbO4:RE3+ (RE = Dy, Eu, Sm, Tb) phosphors were prepared by solid-state reaction at 1100oC and their structural, photoluminescent, and morphological properties were investigated. XRD patterns exhibited that all the synthesized phosphors exhibited a triclinic system with a dominant (210) diffraction peak, irrespective of the type of activator ions. The surface morphologies of rare-earth-ion-doped BiNbO4 phosphors were found to depend strongly on the type of activator ions. The Eu3+ and Dy3+ doped BiNbO4 phosphors revealed a strong red (613 nm) emission resulting from the 5D0→ 7F2 transition of Eu3+ and a dominant yellow (575 nm) emission originating from the 4F9/2→ 6H13/2 transition of Dy3+, respectively, which were the electric dipole transitions, indicating that the activator ions occupy sites of non-inversion symmetry in the BiNbO4 phosphor. The main reddish-orange emission spectra of Sm3+-doped BiNbO4 phosphors were due to the 4G5/2→ 6H7/2 (607 nm) magnetic dipole transition, indicating that the Sm3+ ions were located at inversion symmetry sites in the BiNbO4 host lattice. As for Tb3+-doped phosphors, green emission was obtained under excitation at 353 nm and its CIE chromaticity coordinates were (0.274, 0.376). These results suggest that multicolor emission can be achieved by changing the type of activator ions incorporated into the BiNbO4 host crystal.
Abstract
BiNbO4:RE3+ (RE = Dy, Eu, Sm, Tb) phosphors were prepared by solid-state reaction at 1100oC and their structural, photoluminescent, and morphological properties were investigated. XRD patterns exhibited that all the synthesized phosphors exhibited a triclinic system with a dominant (210) diffraction peak, irrespective of the type of activator ions. The surface morphologies of rare-earth-ion-doped BiNbO4 phosphors were found to depend strongly on the type of activator ions. The Eu3+ and Dy3+ doped BiNbO4 phosphors revealed a strong red (613 nm) emission resulting from the 5D0→ 7F2 transition of Eu3+ and a dominant yellow (575 nm) emission originating from the 4F9/2→ 6H13/2 transition of Dy3+, respectively, which were the electric dipole transitions, indicating that the activator ions occupy sites of non-inversion symmetry in the BiNbO4 phosphor. The main reddish-orange emission spectra of Sm3+-doped BiNbO4 phosphors were due to the 4G5/2→ 6H7/2 (607 nm) magnetic dipole transition, indicating that the Sm3+ ions were located at inversion symmetry sites in the BiNbO4 host lattice. As for Tb3+-doped phosphors, green emission was obtained under excitation at 353 nm and its CIE chromaticity coordinates were (0.274, 0.376). These results suggest that multicolor emission can be achieved by changing the type of activator ions incorporated into the BiNbO4 host crystal.
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