Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation
Blue phosphorescent strontium aluminosilicate powders were prepared by combustion synthesis route and a postannealing treatments at different temperatures. X-ray diffraction analysis showed that phosphors are composed of two main hexagonal phases: SrAl2O4 and Sr3Al32O51. The morphology of the phosph...
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2016/1303247 |
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| author | C. R. García L. A. Diaz-Torres J. Oliva M. T. Romero P. Salas |
| author_facet | C. R. García L. A. Diaz-Torres J. Oliva M. T. Romero P. Salas |
| author_sort | C. R. García |
| collection | DOAJ |
| description | Blue phosphorescent strontium aluminosilicate powders were prepared by combustion synthesis route and a postannealing treatments at different temperatures. X-ray diffraction analysis showed that phosphors are composed of two main hexagonal phases: SrAl2O4 and Sr3Al32O51. The morphology of the phosphors changed from micrograins (1000°C) to a mixture of bars and hexagons (1200°C) and finally to only hexagons (1300°C) as the annealing temperature is increased. Photoluminescence spectra showed a strong blue-green phosphorescent emission centered at λem=455 nm, which is associated with 4f65d1→4f6 (8S7/2) transition of the Eu2+. The sample annealed at 1200°C presents the highest luminance value (40 Cd/m2) with CIE coordinates (0.1589, 0.1972). Also, the photocatalytic degradation of methylene blue (MB) under UV light (at 365 nm) was monitored. Samples annealed at 1000°C and 1300°C presented the highest percentage of degradation (32% and 38.5%, resp.) after 360 min. In the case of photocatalytic activity under solar irradiation, the samples annealed at 1000°C, 1150°C, and 1200°C produced total degradation of MB after only 300 min. Hence, the results obtained with solar photocatalysis suggest that our powders could be useful for water cleaning in water treatment plants. |
| format | Article |
| id | doaj-art-20a57f07493e4b97abbd1dff81cf1be6 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-20a57f07493e4b97abbd1dff81cf1be62025-02-03T01:11:36ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2016-01-01201610.1155/2016/13032471303247Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar IrradiationC. R. García0L. A. Diaz-Torres1J. Oliva2M. T. Romero3P. Salas4Laboratorio de Fotocatálisis y Fotosíntesis Artificial, Centro de Investigaciones en Óptica, AP 1-948, 37150 León, GTO, MexicoLaboratorio de Fotocatálisis y Fotosíntesis Artificial, Centro de Investigaciones en Óptica, AP 1-948, 37150 León, GTO, MexicoLaboratorio de Fotocatálisis y Fotosíntesis Artificial, Centro de Investigaciones en Óptica, AP 1-948, 37150 León, GTO, MexicoFacultad de Ciencias Físico Matemáticas, Universidad Autónoma de Coahuila, Camporredondo, 25000 Saltillo, COAH, MexicoCentro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, AP 1-1010, 76000 Juriquilla, QRO, MexicoBlue phosphorescent strontium aluminosilicate powders were prepared by combustion synthesis route and a postannealing treatments at different temperatures. X-ray diffraction analysis showed that phosphors are composed of two main hexagonal phases: SrAl2O4 and Sr3Al32O51. The morphology of the phosphors changed from micrograins (1000°C) to a mixture of bars and hexagons (1200°C) and finally to only hexagons (1300°C) as the annealing temperature is increased. Photoluminescence spectra showed a strong blue-green phosphorescent emission centered at λem=455 nm, which is associated with 4f65d1→4f6 (8S7/2) transition of the Eu2+. The sample annealed at 1200°C presents the highest luminance value (40 Cd/m2) with CIE coordinates (0.1589, 0.1972). Also, the photocatalytic degradation of methylene blue (MB) under UV light (at 365 nm) was monitored. Samples annealed at 1000°C and 1300°C presented the highest percentage of degradation (32% and 38.5%, resp.) after 360 min. In the case of photocatalytic activity under solar irradiation, the samples annealed at 1000°C, 1150°C, and 1200°C produced total degradation of MB after only 300 min. Hence, the results obtained with solar photocatalysis suggest that our powders could be useful for water cleaning in water treatment plants.http://dx.doi.org/10.1155/2016/1303247 |
| spellingShingle | C. R. García L. A. Diaz-Torres J. Oliva M. T. Romero P. Salas Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation International Journal of Photoenergy |
| title | Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation |
| title_full | Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation |
| title_fullStr | Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation |
| title_full_unstemmed | Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation |
| title_short | Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation |
| title_sort | photocatalytic activity and optical properties of blue persistent phosphors under uv and solar irradiation |
| url | http://dx.doi.org/10.1155/2016/1303247 |
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