The effect of Mg²⁺ concentration on structural and luminescent properties of CaTiO₃: Eu³⁺ phosphor

ABSTRACT

The photoluminescence properties of CaTiO₃ phosphor powders co-doped with Eu³⁺ and Mg²⁺, were prepared by the solid-state reaction method. The powders were characterized by X-ray diffraction, Raman scattering, and photoluminescence spectroscopy. The Crystalline phase and vibrational modes of the phosphors were studied using XRD pattern and Raman Spectrum respectively. The morphological features of the phosphors were characterized by SEM analysis. From Photoluminescence spectra, we have observed two prominent red emission peaks around at 595 nm (⁵D₀ →⁷F₁), 619 nm (⁵D₀ →⁷F₂) with the excitation of 399 nm for Mg²⁺ codoped CaTiO₃:Eu³⁺ phosphors. The partial substitution of Mg²⁺ from 0.1 mol% to 0.4 mol% significantly enhanced the luminescent intensity of CaTiO₃:Eu³⁺ phosphors. Furthermore, increase in Mg²⁺ concentration resulted in concentration quenching. The added Mg²⁺ increased the color purity which turns to be a potential red phosphor in white light emitting diodes (WLEDs).

KEYWORDS:

• CaTiO₃
• Eu³⁺
• Mg²⁺
• XRD
• Raman
• photoluminescence