Color tunable single-phase Eu2+and Ce3+co-activated Sr2LiAlO4phosphors
| Autor: | Maritza Sanchez, Ekaterina Novitskaya, Joanna McKittrick, Shyue Ping Ong, Jungmin Ha, Yoon Hwa Kim, Won Bin Im, Olivia A. Graeve, Zhenbin Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fabrication Energy transfer Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Combustion 01 natural sciences 0104 chemical sciences Activator (phosphor) Materials Chemistry Quantum efficiency Single phase 0210 nano-technology Excitation |
| Zdroj: | Journal of Materials Chemistry C. 7:7734-7744 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c8tc05777j |
| Popis: | High purity Eu2+ and Ce3+ singly and co-activated Sr2LiAlO4 phosphors were successfully synthesized through a facile combustion reaction. Fabrication of color tunable, single-phase phosphors was achieved by varying the Eu2+/Ce3+ ratio that utilized the energy transfer between Ce3+ and Eu2+. For the singly activated compositions, the highest quantum efficiencies were 25% and 40% for Sr1.998Eu0.002LiAlO4 and Sr1.998Ce0.002LiAlO4, respectively. The emission of Sr2LiAlO4:Ce3+ and the excitation of Sr2LiAlO4:Eu2+ overlap in the range of 400 nm–500 nm, so that energy transfer from Ce3+ → Eu2+ takes place. The emission color of Eu2+ and Ce3+ co-activated Sr2LiAlO4 changes from blue, to cool-white, to green depending on the activator concentrations. The maximum quantum efficiency of Eu2+ and Ce3+ co-activated Sr2LiAlO4 was 55%, a 40% increase over the singly activated phosphors, which demonstrates that the quantum efficiency improves by co-activation. |
| Databáze: | OpenAIRE |
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