Strategies to tailor the UV absorption band of Eu3+:La2O3 downshifting nanocrystals

M. Méndez; Y. Cesteros; L. F. Marsal; P. Salagre; P. Formentín; J. Pallarès; M. Aguiló; F. Díaz; J. J. Carvajal

doi:10.1117/12.922532

2 May 2012 Strategies to tailor the UV absorption band of Eu³⁺:La₂O₃ downshifting nanocrystals

M. Méndez, Y. Cesteros, L. F. Marsal, P. Salagre, P. Formentín, J. Pallarès, M. Aguiló, F. Díaz, J. J. Carvajal

Proceedings Volume 8438, Photonics for Solar Energy Systems IV; 843804 (2012) https://doi.org/10.1117/12.922532
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

The charge transfer state (CTS) band of the Eu³⁺:La₂O₃ nanocrystals were studied in detail in order to understand the shift of the maximum of this band. Eu³⁺:La₂O₃ nanoparticles present a broad CTS band. However, the maximum is peaking below 300 nm, far below the limit of the solar spectrum arriving to the surface of the Earth and it makes difficult the application of this material as down-shifting in solar cells. In order to shift the CTS band towards blue wavelengths, different synthesis methods such as hydrothermal and sol-gel modified Pechini methods were used to prepare these nanoparticles, and adding additional CTS bands with co-doping ions such as Bi³⁺ was explored as well. The crystalline structure of Eu³⁺:La(OH)₃, Eu³⁺:La₂O₃, Bi³⁺:Eu³⁺:La(OH)₃ and Bi³⁺:Eu³⁺:La₂O₃ and the cell parameters of Eu³⁺:La₂O₃ and Bi³⁺:Eu³⁺:La₂O₃ were analyzed by X-ray powder diffraction technique and their morphology was observed by transmission electron microscopy. Once we obtained the cell parameters refining the XRD patterns by Full-prof software, we were able to calculate the Eu³⁺-O distance by ATOMS software through the structure previously represented following the Pauling model. The results found suggest that we need to take into account another parameter apart from the Eu³⁺-O distance to explain the CTS band small shift.

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M. Méndez, Y. Cesteros, L. F. Marsal, P. Salagre, P. Formentín, J. Pallarès, M. Aguiló, F. Díaz, and J. J. Carvajal "Strategies to tailor the UV absorption band of Eu³⁺:La₂O₃ downshifting nanocrystals", Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 843804 (2 May 2012); https://doi.org/10.1117/12.922532

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