Synthesis and Luminescence of Hollow Spherical Eu3+- or Tb3+-Doped MgAl2O4 Phosphors
Abstract:Eu3+- or Tb3+-doped MgAl2O4 hollow spheres have been successfully synthesized via facile hydrothermal method by using carbon spheres as template followed by a subsequent heat treatment. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results showed that the hollow microspheres possessed diameters in the range of 1∼2.5 μm and shell thickness of 60∼80 nm. A possible formation mechanism for hollow spheres was proposed. MgAl2O4:Eu3+ show strong red emission at 619 nm corresponding to the forced electric dipole 5D0 → 7F2 transition of Eu3+, and MgAl2O4:Tb3+ exhibit strong green emission at 545 nm corresponding to 5D4 → 7F5 transition of Tb3+.
Document Type: Research Article
Publication date: 2010-01-01
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