Tunable white emission of silver-sulfur-zeolites as single-phase LED phosphors
| Autor: | Wouter Baekelant, Tiago Moreira, Eduardo Coutino-Gonzalez, Mark Van der Auweraer, Maarten B. J. Roeffaers, Catarina Viola, Cheol Woong Kim, César A. T. Laia, Johan Hofkens, Michiel De Ras, Andreia Ruivo, Giacomo Romolini, Cristina Martin, Li Sun, Johan A. Martens, Eduard Fron |
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| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Materials science chemistry.chemical_element Phosphor zeolites 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences General Materials Science Zeolite Spectroscopy Instrumentation LED Metal cluster self-assembly 021001 nanoscience & nanotechnology Sulfur Atomic and Molecular Physics and Optics 0104 chemical sciences Characterization (materials science) chemistry Self-assembly 0210 nano-technology Luminescence white-emitting phosphors |
| Zdroj: | Methods and applications in fluorescence. 8(2) |
| ISSN: | 2050-6120 |
| Popis: | Metal clusters confined inside zeolite materials display remarkable luminescent properties, making them very suitable as potential alternative phosphors in white LED applications. However, up to date, only single-color emitters have been reported for luminescent metal-exchanged zeolites. In this study, we synthesized and characterized white emitting silver-sulfur zeolites, which show a remarkable color tunability upon the incorporation of silver species in highly luminescent sulfur-zeolites. Via a combined steady-state and time-resolved photoluminescence spectroscopy characterization, we suggest that the observed luminescence and tunability arise from the presence of two different species. The first associated to an orange-red emitting silver cluster (Ag-CL), whereas the second is related to a blue-white emitting S-Ag-species. The relative contribution of both luminescent species depends on the synthesis procedure. It was shown that the formation of the blue-white emitting S-Ag-species is favored upon a heat-treatment of the samples. ispartof: METHODS AND APPLICATIONS IN FLUORESCENCE vol:8 issue:2 ispartof: location:England status: published |
| Databáze: | OpenAIRE |
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