Publisher : The Materials Research Society of Korea
DOI : 10.3740/MRSK.2016.26.3.143
Title & Authors
Photoluminescence Properties of CaAl2O4:RE3+(RE = Tb, Dy) Phosphors Cho, Shinho;
(RE = Tb or Dy) phosphor powders were synthesized with different contents of activator ions and by using the solid-state reaction method. The effects of the content of activator ions on the crystal structure, morphology, and emission and excitation properties of the resulting phosphor particles were investigated. XRD patterns showed that all the synthesized phosphors had a monoclinic system with a main (220) diffraction peak, irrespective of the content and type of and ions. For the -doped phosphor powders, the excitation spectra consisted of one broad band centered at 271 nm in the range of 220-320 nm and several weak peaks; the main emission band showed a strong green band at 552 nm that originated from the transition of ions. For the -doped phosphor, the emission spectra under ultraviolet excitation at 298 nm exhibited one strong yellow band centered at 581 nm and two weak bands at 488 and 672 nm. Concentration-dependent quenching was observed at 0.05 mol of and contents in the host lattice.
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