New phosphors synthesised by ion exchange of a metakaolin-based geopolymer
| Autor: | Kenneth J. D. MacKenzie, Joanne J. Rogers, William J. Trompetter |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Inorganic polymer
Materials science Photoluminescence Ion exchange 020101 civil engineering Geology Phosphor 02 engineering and technology 021001 nanoscience & nanotechnology 0201 civil engineering Geopolymer Chemical engineering Geochemistry and Petrology Aluminosilicate 0210 nano-technology Luminescence Metakaolin |
| Zdroj: | Applied Clay Science. 157:1-7 |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2018.02.025 |
| Popis: | A geopolymer prepared from dehydroxylated kaolinite-type clay was used as a host for trivalent rare earth ions to produce new photoluminescent materials. Sm3+ and Eu3+ ions were individually incorporated into the geopolymer host by ion exchange, partially replacing the charge-balancing K+ ions. The resulting materials were characterised by XRD, SEM/EDS, 27Al and 29Si MAS NMR and PIXE, and their luminescence behaviour was determined by photoluminescence spectroscopy. In addition to the characteristic photoluminescence of the Sm3+ and Eu3+ ions, the geopolymer host exhibited broad-band photoluminescence peaking at 440 nm under 372 nm excitation. The use of the clay-based geopolymer host permitted a higher concentration of rare earth ions to be incorporated compared with a previously reported chemosynthetic aluminosilicate inorganic polymer host, resulting in rare earth photoluminescence of increased intensity. A further advantage of the clay-based geopolymer phosphor is its ease of synthesis and cost-effectiveness compared with the chemosynthetic aluminosilicate inorganic polymer host. |
| Databáze: | OpenAIRE |
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