Photoluminescence profile mapping of Eu(III) and Tb(III -> IV)-embedded in quantum size SnO2 nanoparticles
- Photoluminescence profile mapping of Eu(III) and Tb(III -> IV)-embedded in quantum size SnO2 nanoparticles
- 손영구; 최영인
- HOMOGENEOUS PRECIPITATION; LUMINESCENCE PROPERTIES; OPTICAL-PROPERTIES; NANOSTRUCTURES; FLUORESCENCE; NANORODS; GROWTH; NANOCRYSTALS; TEMPERATURE; MECHANISM
- Issue Date
- ROYAL SOC CHEMISTRY
- RSC ADVANCES, v.4, no.59, pp.31155 - 31161
- Eu(III) and Tb(IV) activators were embedded in quantum size SnO2 nanoparticles by a hydrothermal method and their morphologies, crystal structures and spectroscopic properties were examined by transmission electron microscopy, X-ray diffraction crystallography, UV-visible absorption, and 2D/3D-photoluminescence mapping. Eu(III) embedment showed strong red emissions between 570 and 720 nm, which were attributed to the D-5(0) -> F-7(J) (J = 0, 1, 2, 3, 4) transitions. The magnetic dipole D-5(0) -> F-7(1) transition was dominated by an indirect charge transfer excitation, which was attributed to Eu(III) doped at centrosymmetric sites. Conversely, the electric dipole D-5(0) -> F-7(2) transition was dominated by direct excitation of Eu(III), which was attributed to Eu(III) at low symmetry sites. Tb(III) was oxidized to Tb(IV) in SnO2 and showed no characteristic green emissions. A full understanding of the photoluminescence mechanism of Eu(III) and Tb(IV) in SnO2 will provide new insights into the development of SnO2-based phosphor materials.
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