Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437638 | Ceramics International | 2017 | 24 Pages |
Abstract
The structural and luminescent properties of Eu3+ doped TiO2 nanophosphors synthesized by low cost combustion method were investigated. The X-ray diffraction analysis revealed that crystallite size decreases with doping concentration. Lattice volume expansion occurred due to the substitution of Ti4+ ions by larger ionic radii ions Eu3+. FESEM images showed prepared phosphors to be nano size spherical shaped particles. Energy band gap of 3Â mol% Eu3+ doped samples decreased to 3.15Â eV due to doping effect. The Eu3+ doped TiO2 nanophosphors exhibited main red emission peak centered at 616Â nm under 395Â nm UV light excitation. Concentration quenching was observed at 3Â mol% doping, that has been ascribed to dipole-dipole interaction. The covalent nature of Eu-O bond and environment around Eu3+ ions were discussed using Judd-Ofelt (J-O) intensity parameters. Internal quantum efficiency was calculated using excited state lifetime 5D0 state of Eu3+ ion and J-O theory. The CIE colour coordinates and colour purity were calculated using the spectral energy distribution function. Low excited state life time indicated that Eu3+ doped TiO2 can be used as red emitting phosphor for white light emitting diode applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A.K. Kunti, S.K. Sharma,