Judd–Ofelt Analysis of Barium Zirconate Doped with Various Concentrations of Europium (III)

Abstract

A perovskite material, Barium Zirconate (BZO) doped with 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 mol% of Europium (III) were prepared using a solid-state reaction technique. X-ray diffraction (XRD) pattern of BZO doped with 2.0 mol% of Europium was observed. The experimental XRD pattern matched significantly with the standard XRD pattern with the Crystallographic Open Database (COD) card number (96-153-2744) with a figure of merit of 0.89. Photoluminescence emission spectra of the samples prepared exhibited two prominent peaks centred at 592 nm and 612 nm which were attributed to the transitions (⁵D₀ → ⁷F₂) and (⁵D₀ → ⁷F₄) respectively. The concentration quenching occurred when the doping concentration was increased after 2.0 mol% of Europium (III). A coordinate (0.58, 0.41) was found in the Colour Chromaticity Diagram (CIE), which falls in orange–red region. The method involved in the calculation of the Judd-Ofelt intensity parameter was briefly described. The ratio R₂₁ = I (⁵D₀ → ⁷F₂)/I (⁵D₀ → ⁷F₁) was found as 2.93 which is indicative that the electric dipole transitions are more prominent in comparison to the magnetic dipole transitions. The value of intensity parameters ${\Omega }_2$ ${\Omega }_4$ was found as 4.98 × 10⁻²⁰ cm² and 8.56 × 10⁻²⁰ cm² respectively.

Keywords:

• Photoluminescence
• perovskite
• XRD
• concentration quenching
• Judd-Ofelt parameters
• CIE

Disclosure statement

No potential conflict of interest was reported by the author(s).