X-ray absorption spectroscopy and neutron-diffraction study of persistent luminescent Sr2MgSi2O7 glass-ceramics
[EN] Glass-ceramics based on the Eu 2 O 3 /Dy 2 O 3 -doped Sr 2 MgSi 2 O 7 phosphor have been obtained from sinter- ing and crystallization of glass powders. The doped parent glasses show red emission under excitation of UV light. After thermal treatment, the corresponding glass-ceramics show persis...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/251857 |
| Acceso en línea: | http://hdl.handle.net/10261/251857 |
| Access Level: | acceso abierto |
| Palabra clave: | Sr2MgSi2O7 Phosphors Europium Glass-ceramics XAS Neutron diffraction |
| Sumario: | [EN] Glass-ceramics based on the Eu 2 O 3 /Dy 2 O 3 -doped Sr 2 MgSi 2 O 7 phosphor have been obtained from sinter- ing and crystallization of glass powders. The doped parent glasses show red emission under excitation of UV light. After thermal treatment, the corresponding glass-ceramics show persistent blue emission which emanates from Eu 2 + incorporated in the crystals; red emission also occurs from Eu 3 + in the residual vitreous phase. The aim of this work is to investigate the structure of defects such as oxygen and strontium vacancies in the Sr 2 MgSi 2 O 7 crystals and the environment, oxidation state and coordination of the Eu and Dy ions in the glass-ceramics, their partitioning between crystalline and glassy phase and their influence on lu- minescence properties, employing X-ray absorption spectroscopy (XAS) and neutron diffraction (ND) as investigative structural tools. We suggest that the luminescence mechanism involves the presence of shal- low electron traps that are abruptly emptied for temperatures above 100 K. The most persistent lumines- cence is likely due to an effective concentration of Eu 2 + in the dendritic-shaped crystals in one of the particular compositions, and with a suitable level of Sr vacancies, even though Sr vacancies are most likely formed in all the investigated samples. |
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