Probing structural and luminescence properties of Ce nanocrystals via XAS, PL, and TL studies
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Date
2025
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Abstract
MgO:Ce and MgO:CeLi nanocrystals have been prepared using the solution combustion method and investigated
for structural, electronic structure, photoluminescence, and thermoluminescence properties. X-ray diffraction
(XRD) analysis revealed the single-phase formation of MgO:Ce amd MgO:CeLi compounds up to 0.1 mol% of Ce
doping. The formation of CeO
2
2+
phase has been observed at 2 mol% Ce doping in MgO. Low energy shift in the Mg
K-edge X-ray absorption near edge structure (XANES) spectra conveys favorable tetrahedral site occupancy of
Mg
3
ions in MgO:Ce nanocrystals. The enhanced intensity of the O K-edge XANES feature, in MgO:Ce samples,
reveals a more, p-projected, unoccupied density of states and significant hybridization of Ce 4f and O 2p states.
Ce L
edge XANES spectra confirmed the coexistence of Ce
4+
and Ce
3+
ions in the samples. Photoluminescence
(PL) experiments, conducted with UV LED excitation at 275 nm and 310 nm, showed emissions in two regions; a
blue region centered at 430 nm and a red region at 670 nm in pure MgO. Additionally, distinct emission bands
corresponding to Ce 5d-4f transitions were observed and the Li co-doping could enhance the PL intensity.
Thermoluminescence (TL) studies of the samples were conducted after being exposed to the different doses (100
Gy, 500 Gy, 1 kGy) of gamma radiation. The deconvolution of TL peaks has confirmed the presence of multiple
traps. Kinetic parameters of TL glow peaks revealed re-trapping and closely spaced traps within the forbidden
band gap. The stability and linear behavior of TL peaks demonstrated the excellent dosimetry characteristics of
prepared MgO: CeLi nano phosphors.