Luminescence studies of orange-red emitting xZnO-(1-x)MgO-Al₂O₃: Eu³⁺ (x=0.2,0.4,0.5,0.6,0.8) phosphors

ABSTRACT

XZno-(1-x)MgO-Al₂O₃: Eu³⁺(0.1 mol%) (x = 0.2, 0.4, 0.5, 0.6, 0.8) orange-red phosphors have been prepared using traditional solid-state reaction route. The characterisation of the samples has been done using X-ray diffraction (XRD) technique, thermoluminescence (TL), photoluminescence (PL), mechanoluminescence (ML) and optically stimulated luminescence (OSL) studies. The structural study has been done using X-ray diffraction technique. At an excitation wavelength of 394 nm, the prepared phosphors displayed the typical emission of Eu(III) ions as a result of the ⁵D₀-⁷F_j transition. Optimum doping concentration is observed to be 0.4 mol%. The thermal stability and activation energy of the phosphor are analysed from the TDPL spectra (Temperature-Dependent Photoluminescence). The thermoluminescence and mechanoluminescence of 0.6ZnO-0.4MgO-Al₂O₃: Eu³⁺ (0.4 mol %) have also been discussed.

KEYWORDS:

• Photoluminescence
• temperature dependent photoluminescence
• thermoluminescence
• mechanoluminescence
• optically stimulated luminescence

Acknowledgments

The authors are extremely thankful to Sophisticated Analytical Instruments Facility (SAIF), STIC, Cochin for providing XRD. SICC University of Kerala for providing XPS Facility, Sophisticated Analytical Instruments Facility (SAIF), M.G. University Kottayam for providing PL measurements and IGCAR, Chennai, for TL and OSL measurements.

Disclosure statement

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