Doping-induced phase formations and luminescence of Eu3+-activated LaTiSbO6
| Autor: | A. Siru, Yan Xie, Ruijin Yu, Bin Deng, Leyan Shan, Ka Ding, Xue Geng, Lixia Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Band gap Mechanical Engineering Doping Metals and Alloys Analytical chemistry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Crystal Mechanics of Materials Materials Chemistry Orthorhombic crystal system 0210 nano-technology Luminescence Electronic band structure |
| Zdroj: | Journal of Alloys and Compounds. 806:316-326 |
| ISSN: | 0925-8388 |
| Popis: | LaTiSbO6:xEu3+ (x = 0∼)1.0) phosphor with a typical PbSb2O6-related structure was prepared through a facile solid-state ceramic routine, and morphology measurements and structural Rietveld refinements were conducted. Results show that LaTiSbO6:xEu3+ (x = 0–0.4) phosphors formed a single trigonal phase (T-phase, space-group of P-31 m, No.162). The increase of Eu3+ doping (x = 0.5–0.6) can induce the formation of a second phase formation, that is, orthorhombic structure (O-phase) with space-group Pnma (No. 62). Meanwhile, heavily doped LaTiSbO6:xEu3+ (x = 0.6–1.0) was crystallized into a single orthorhombic structure (O-phase). LaTiSbO6 had a direct transition and the band gap was 2.97 eV. The luminescence properties of LaTiSbO6:xEu3+ (x = 0–1.0) were investigated at different doping levels. Eu3+-doping remarkably modified the band structure, resulting in the blue-shift of optical absorption, and the intrinsic blue emission of LaTiSbO6 peaked at 465 nm. Doping concentration exerted interesting influences on the optical properties of the phosphors, such as narrowed band gap, tunable red-emitting, dominant blue excitation wavelength, and thermal stability of the luminescence. Eu3+ ion was applied as a spectroscopic probe for the investigation of the relationship between luminescence and crystal microstructure. |
| Databáze: | OpenAIRE |
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