Janek, M; Klement, R; Naftaly, M; Trusova, E; Gatial, A; Veteska, P; Baca, L (2022) Terahertz response of Er3+/Yb3+ co-doped La2Zr2O7 synthesized using the sol-gel precipitation method. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 644. 128836

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Abstract

The effect of doping elements such as Er3+ and Yb3+, replacing isomorphically lanthanum in the La2Zr2O7 with pyrochlore cubic structure, on material photophysical properties was investigated by selective doping, in the molar ratio of Er3+/Yb3+ ranging from 0.5 to 5. The reflectance spectra of materials prepared by sol-gel co-precipitation method, investigated in the UV-VIS-NIR range showed as expected well resolved absorptions due to the 4f-4f intra-configurational transitions. At the same time, dielectric properties of sintered samples were investigated by terahertz time domain spectroscopy. The refractive indices observed in the range of ~4.50-5.15, indicate high dielectric permittivity at THz frequencies applicable in energy storage materials or THz communication components. For all samples a broad absorption band was found in the THz region and the band intensities were clearly associated with the doping amount of Er and Yb cations into the La2Zr2O7 structure, at frequencies 0.75-1.02 THz. Significant correlation at the level of R2 = 0.911 was found between the absorption band corresponding to the 4I15/2 à 2H11/2 transition at 520.5 nm and the integrated intensities of THz bands.

Item Type:	Article
Subjects:	Optical Radiation and Photonics > Materials and Appearance
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1016/j.colsurfa.2022.128836
Last Modified:	22 Sep 2023 12:37
URI:	https://eprintspublications.npl.co.uk/id/eprint/9824