Spectroscopic studies of metastable tetragonal ZrO2 nanocrystals

Article Optics

Effects of Ho3+ concentration on the microstructure, photoluminescence and temperature sensing properties of ZrO2: Er3+/Yb3+/Ho3+ nanocrystals

Mingdong Hong et al.

Summary: In this study, ZrO2:Er3+/Yb3+/Ho3+ nanocrystals were synthesized for temperature sensing in both the NIR-II and visible regions. The addition of Ho3+ ions induced a phase transition in ZrO2 and increased the grain size, leading to enhanced visible and NIR emissions. The optical thermometry performance of the nanocrystals depended on the concentration of Ho3+.

JOURNAL OF LUMINESCENCE (2023)

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Article Optics

The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation

Aleksandar Ciric et al.

Summary: In this study, 15 μm thick ZrO2:Nd3+ coatings were synthesized using the plasma electrolytic oxidation process with the addition of different concentrations of Nd2O3 powders. The coatings exhibited morphologies characterized by numerous pores and cracks, with uniform distribution of coating constituents. The XRD analysis revealed the dominant monoclinic phase and the stabilization of the tetragonal phase by Nd impurity. The Nd2O3 concentration was found to have a linear effect on the incorporation of Nd in the coatings. Photoluminescence spectra showed near-infrared emissions at typical energies for Nd3+ ion, with the highest emission intensity observed at 2.0 g/L Nd2O3. A novel equation for calculating the spectroscopic quality factor from the most intense emissions was presented, showing that the coating with the highest photoluminescent intensity had the lowest spectroscopic quality factor. The luminescence intensity decreased with temperature due to the phonon-assisted cross-relaxation mechanism, and luminescence thermometry showed a relative sensitivity of about 2% K-1 in the temperature range of 300-380 K.

JOURNAL OF LUMINESCENCE (2023)

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Article Chemistry, Multidisciplinary