Upconversion luminescence properties and thermal quenching mechanisms in the layered perovskite La<sub>1.9</sub>Er<sub>0.1</sub>Ti<sub>2</sub>O<sub>7</sub> towards an application as optical temperature sensor - Archive ouverte HAL
Article Dans Une Revue Journal of Alloys and Compounds Année : 2018

Upconversion luminescence properties and thermal quenching mechanisms in the layered perovskite La1.9Er0.1Ti2O7 towards an application as optical temperature sensor

Résumé

The structural evolution between the monoclinic (layered-perovskite) and cubic (pyrochlore) structures is studied for the complete series of La2-xErxTi2O7 synthetized by solid-state reaction. A partial solid solution with layered perovskite structure is achieved until x = 0.10. The luminescence properties of these oxides show a low quantum efficiency and the concentration quenching is observed for x = 0.10. However, La1.9Er0.1Ti2O7 oxide exhibits interesting UpConversion (UC) properties at multiple excitation wavelengths (784, 808 and 980 nm). Laser power studies have demonstrated a two-photon upconversion process for 808 and 980 nm excitations. Moreover, the measurement of the lifetimes on the 4F9/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions makes it possible to identify an Energy Transfer (ET) mechanism. The thermal effect on upconversion properties is also studied under 808 nm excitation. The UC intensity shows atypical evolutions: 4F9/2 → 4I15/2 transition follows a continuous decrease as a function of temperature, while 4S3/2 →4I15/2 and 2H11/2 → 4I15/2 transitions reach maxima at 150 and 450 K, respectively. The calculation of temperature dependent Fluorescence Intensity Ratio and CIE 1931 color coordinates indicated that La1.9Er0.1Ti2O7 oxide could serve as a temperature sensor.

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hal-01716248 , version 1 (20-11-2023)

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Alexandre Bayart, Fabien Szczepanski, Jean-François Blach, Jolanta Rousseau, Arturas Katelnikovas, et al.. Upconversion luminescence properties and thermal quenching mechanisms in the layered perovskite La1.9Er0.1Ti2O7 towards an application as optical temperature sensor. Journal of Alloys and Compounds, 2018, 744, pp.516 - 527. ⟨10.1016/j.jallcom.2018.02.055⟩. ⟨hal-01716248⟩
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