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Eu(2+) luminescence in strontium aluminates.

D Dutczak1, T Jüstel, C Ronda

  • 1Department of Chemical Engineering, Münster University of Applied Sciences, Stegerwaldstr. 39, D-48565 Steinfurt, Germany.

Physical Chemistry Chemical Physics : PCCP
|May 21, 2015
PubMed
Summary
This summary is machine-generated.

Luminescence properties of europium (Eu(2+)) doped strontium aluminates were studied. Tuning the strontium-to-aluminum ratio alters emission color from UV to red, impacting optical applications.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Luminescence

Background:

  • Strontium aluminates doped with europium (Eu(2+)) are investigated for their luminescence properties.
  • The Sr/Al ratio influences the host lattice's local coordination and covalency.

Purpose of the Study:

  • To explore how local coordination and covalency in strontium aluminates affect Eu(2+) optical properties.
  • To understand the relationship between the Sr/Al ratio and Eu(2+) luminescence characteristics.

Main Methods:

  • Recording UV and VUV excited luminescence spectra.
  • Analyzing luminescence decay curves.
  • Characterizing luminescence properties of various strontium aluminates (SrAl12O19, SrAl4O7, Sr4Al14O25, SrAl2O4, Sr3Al2O6).

Main Results:

  • Eu(2+) emission spans UV to red, influenced by crystal-field splitting and oxygen covalency.
  • SrAl12O19:Eu(2+) shows narrow UV emission, while Sr3Al2O6:Eu(2+) exhibits yellow-red emission.
  • Increasing Sr/Al ratio shifts Eu(2+) emission to longer wavelengths.

Conclusions:

  • The emission color of Eu(2+) in strontium aluminates can be tuned across a wide spectral range.
  • Local coordination and covalency are key factors controlling Eu(2+) luminescence in these materials.
  • Differences in Eu(2+) emission from various crystallographic sites are observed, not always correlating with the oxygen coordination sphere.