Preparation and luminescence properties of Eu2+ in SiO2 xerogels
| Autor: | Jintao Bai, Ting Li, Dekai Zhang, Weizong Chen, Jun Fan, Xun Hou, Xiaoyun Hu |
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| Rok vydání: | 2007 |
| Předmět: |
Photoluminescence
Materials science Organic Chemistry Doping Analytical chemistry chemistry.chemical_element Mineralogy Phosphor Emission intensity Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry Emission spectrum Electrical and Electronic Engineering Physical and Theoretical Chemistry Luminescence Europium Spectroscopy Sol-gel |
| Zdroj: | Optical Materials. 29:1327-1331 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2006.06.008 |
| Popis: | Al-doped and B, Al co-doped SiO2 xerogels with Eu2+ ions were prepared only by sol–gel reaction in air without reducing heat-treatment or post-doping. The luminescence characteristics and mechanism of europium doping SiO2 xerogels were studied as a function of the concentration of Al, B, the europium concentration and the host composition. The emission spectra of the Al-doped and B, Al co-doped samples all show an efficient emission broad band in the blue violet range. The blue emission of the Al-doped sample was centered at 437 nm, whereas the B, Al co-doped xerogel emission maximum shifted to 423 nm and the intensity became weaker. Concentration quenching effect occurred in both the Al-doped and B, Al co-doped samples, which probably is the result of the transfer of the excitation energy from Eu2+ ions to defects. The highest Eu2+ emission intensity was observed for samples with the Si(OC2H5)4:C2H5OH:H2O molar ratio of 1:2:4. |
| Databáze: | OpenAIRE |
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