Persistent luminescence and synchrotron radiation study of the Ca2MgSi2O7:Eu2+,R3+ materials |
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Institution: | 1. Department of Chemistry, University of Turku, FI-20014 Turku, Finland;2. Institute of Physics, University of Tartu, EE-51014 Tartu, Estonia;3. Graduate School of Materials Research, Turku, Finland |
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Abstract: | The tetragonal : persistent luminescence materials were prepared by a solid state reaction. The UV excited and persistent luminescence was observed in the green region centred at 535 nm. Both luminescence phenomena are due to the same ion occupying the single site in the host lattice. The codoping usually reduced the persistent luminescence of :, which differs from the : and : materials. Only the ion enhanced slightly the persistent luminescence. With the aid of synchrotron radiation, the band gap energy of : was found to be about 7 eV that is very similar to those of the : materials. Thermoluminescence results suggested that the ions might act as electron traps, but only the TL peaks created by and can be found in the temperature range accessible. Lattice defects (e.g. oxygen vacancies) are also important, since the same main thermoluminescence peak was observed at about with and without codoping. |
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