Journal
OPTICAL MATERIALS
Volume 92, Issue -, Pages 303-310Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2019.04.049
Keywords
Layered-perovskite; Thin films; Pulsed laser deposition; Spectroscopic ellipsometry; Optical properties
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Funding
- Chevreul Institute [FR 2638]
- Ministere de l'Enseignement Superieur et de la Recherche
- Region Nord Pas-de-Calais
- FEDER
- C'Nano Nord-Ouest competence centre
- Conseil Regional des Hauts-de-France
- European Regional Development Fund
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Ln(2)Ti(2)O(7) thin films with Ln = La to Lu were successfully grown on (110)-SrTiO3 substrates by pulsed laser deposition. The microstructure and optical properties of the entire Ln(2)Ti(2)O(7) series were investigated by X-Ray diffraction, atomic force microscopy, scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy and spectroscopic ellipsometry. For large ionic radii (i.e. Ln(3+) = La3+ to Eu3+), the monoclinic/layered-perovskite structure is obtained with epitaxial growth. For smaller ionic radii (i.e. Ln(3+) = Tb3+ to Lu3+), the cubic/pyrochlore structure is privileged. We have also observed the growth of a Gd2Ti2O7 polymorphic phase between the stability limit of the two previously described structures. The optical band gap increases when the ionic radius of Ln(3+) decreases. Refractive index (n) and extinction coefficient (k) have been calculated over a wavelength range of 260-1500 nm. The low value of the extinction coefficient indicates that these materials are transparent in the visible range and can therefore be used in electro-optics systems in the case of the layered-perovskite structure and more widely as emitting materials in solid-state lasers optically pumped.
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