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Valence-Change of Eu and Its Effects on the Luminescent Properties of Sr2MgSi2O7:Eu,Dy

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Abstract:

Long afterglow phosphors of Sr2MgSi2O7:Eu,Dy were prepared by high temperature solid state reaction in oxidation atmospheres, and then were treated sequentially in reducing atmosphere → oxidation atmosphere → reducing atmosphere. The crystal structure of the samples was investigated by using powder X-ray diffraction (XRD). The measurements of the photoluminescence and the thermoluminescence properties suggest the difference in the luminescent properties between Eu2+ and Eu3+. Eu3+ ions occupy two different sites, and their emission spectra consist of four discrete line spectra, due to the 5D07F1 (590 nm), 5D07F2 (618 nm), 5D07F4 (703 nm) and the 5D27F3 (510 nm) transitions. But in contrast, the emission spectrum of Eu2+ is characteristic of a broadband spectrum due to the 4f7 → 4f6 5d1 transition. The luminescence of Sr2MgSi2O7:Eu2+,Dy3+ displays both higher intensity and longer decay than that of Sr2MgSi2O7:Eu3+,Dy3+. The emissions from Dy3+ are detected in all samples, indicating that Dy3+ ions act not only the trap center but also the luminescence center in the host lattice of Sr2MgSi2O7.

Keywords: HIGH TEMPERATURE SOLID STATE REACTION; LONG AFTERGLOW; SR2MGSI2O7; VALENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2138

Publication date: March 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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