Spectral Analysis of RE³⁺ (Sm³⁺ or Dy³⁺): (Mg Ca)₂ Bi₄Ti₅O₂₀ Ceramics

Abstract

0.2 mol% of Sm³⁺ or Dy³⁺ ions doped magnesium calcium bismuth titanate ((MgCa)₂Bi₄Ti₅O₂₀) ceramic powders have been synthesized by a solid state reaction method in order to study the photoluminescence properties. Photoluminescence spectra of Sm³⁺: (MgCa)₂ Bi₄Ti₅O₂₀ ceramics have shown strong reddish-orange emission at 599 nm (⁴G_5/2 → ⁶H_7/2) with an excitation wavelength λ_exci = 405 nm (⁶H_5/2 → ⁴F_7/2) and Dy³⁺: (MgCa)₂Bi₄Ti₅O₂₀ ceramics, have shown yellow emission at 583 nm (⁴F_9/2 → ⁶H_13/2) with λ_exci = 426 nm (⁶H_15/2 → ⁴G_11/2). Both the rare earth ions (Sm³⁺ or Dy³⁺) containing ceramics have displayed their brighter emission performance from their measured spectral results. In addition, these powder ceramics have also been characterized for their structures and morphology from the measurements of X-ray diffraction, scanning electron microscope and energy dispersive X-ray analysis results.

Keywords:

• Solid state reaction
• emission
• excitation
• RE³⁺: ceramics

Communicated by Dr George W. Taylor