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Title: The effect of the host composition on the lifetime decay properties of barium/strontium aluminates compounds

This paper reports the influence of the structural change on the luminescence of Eu-doped barium/strontium aluminates when excited with monochromatic X-rays (also known as X-ray excited optical luminescence—XEOL). Ba{sub 1−x}Sr{sub x}Al{sub 2}O{sub 4} samples, with 0 < x < 1, were produced via proteic sol-gel route and it was observed that the XEOL emission spectra are composed by the Eu{sup 2+} and Eu{sup 3+} transitions, although no Eu{sup 2+} was observed in the X-ray absorption spectra. The XEOL intensities while the sample is under irradiation decreased as a function of the irradiation time, indicating the buildup of radiation damage. The saturation level of the XEOL is directly correlated to the amount of damages induced by the irradiation and the sample composition. The Ba-rich samples are the ones with higher XEOL yield. X-ray induced long lasting phosphorescence (LLP) was also observed for all samples and it was found that the duration of the phosphorescence emission also depends on the sample composition. In Sr-rich samples, the LLP has a slower decay time constant than in Ba-rich samples. A model of the radiation induced luminescence is presented and all these features are discussed in terms of the energetic costs and the type of defects generated in themore » sample.« less
Authors:
 [1] ; ;  [2] ;  [3]
  1. Departamento de Física, Universidade Federal de Sergipe, 49500-000 Itabaiana, SE (Brazil)
  2. Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristóvão, SE (Brazil)
  3. Instituto Federal de Sergipe, 49400-000 Lagarto, SE (Brazil)
Publication Date:
OSTI Identifier:
22277897
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; BARIUM COMPOUNDS; DOPED MATERIALS; EMISSION SPECTRA; EUROPIUM IONS; IRRADIATION; LIFETIME; MONOCHROMATIC RADIATION; PHOSPHORESCENCE; RADIATION EFFECTS; SOL-GEL PROCESS; STRONTIUM COMPOUNDS; X RADIATION; X-RAY SPECTRA