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Effect of the Er3+ Co-dopant on the Green Upconversion Emission of LaSr2AlO5:Yb3+ Phosphors

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Abstract

This work presents the structural, morphological and optical properties of LaSr2AlO5:Yb3+,Er3+ phosphors (LSA:Yb,Er) synthesized by a combustion method. The Yb3+ concentration was kept constant at 2 mol.%, while the Er3+ concentration changed from 0.2 mol.% to 6 mol.%. X-ray diffraction measurements revealed that all the LSA:Yb,Er phosphors presented a pure tetragonal phase. Scanning electron microscopy images show that LSA:Yb,Er phosphors increased their size as the Er3+ concentration increases (from 1.95 μm for Er3+ concentrations < 1 mol.% to 2.3 μm for Er3+ content in the range of 1 ≤ x < 6 mol.%,). In addition, the phosphors presented oval-like and quasipherical shapes for Er3+ content ≤ 1 mol.%. When the Er3+ concentrations are > 1 mol.%, the LSA:Yb,Er phosphors present a notorious increase of conglomeration, and the particles had irregular morphologies. According to luminescence measurements, the LSA:Yb,Er phosphors present a green luminescence centered at 549 nm (λexc = 968 nm). The strongest green emission was observed for an Er3+ concentration of 1 mol.%, above this concentration, the green emission intensity decreases due to an excess of OH and carbonate groups on the surface of LSA:Yb,Er phosphors, as confirmed by the FTIR spectra. Moreover, the CIE coordinates for the green emission were tuned with the Er3+ concentration. These results suggest that LSA host could be a good candidate to produce upconversion emission when doped with rare earths, which could be attractive for the development of lighting sources.

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Acknowledgements

C. R. Garcia thanks to PRODEP-SEP 2017 Cuerpos Académicos and FONCYT-COECYT 2016 Projects and Universidad Autónoma de Coahuila (UAdeC) for the partial support to this work. M. Guzman-Rocha thanks CONACYT for the Ph.D. scholarship. Authors also appreciate the technical work performed by R. Valdivia, C. Albor and Martín Olmos from Centro de Investigaciones en óptica León México.

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Authors and Affiliations

  1. CONACYT-Facultad de Ciencias Quimicas, Universidad Autónoma de Coahuila, 25280, Saltillo, Coahuila, Mexico

    J. Oliva

  2. Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Coahuila, Edif. A, unidad Camporredondo, 25000, Saltillo, Coahuila, Mexico

    J. Oliva, C. R. García & M. T. Romero

  3. Centro de Investigaciones en Óptica, Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados (GEMANA), A.P. 1-948, León, Gto., 37160, Mexico

    L. A. Díaz Torres, C. Camacho & M. Guzman-Rocha

  4. Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Carretera Tijuana-Ensenada km 107, Playitas, 22860, Ensenada, B.C, Mexico

    G. A. Hirata

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  1. J. Oliva
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Correspondence to L. A. Díaz Torres.

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Oliva, J., García, C.R., Díaz Torres, L.A. et al. Effect of the Er3+ Co-dopant on the Green Upconversion Emission of LaSr2AlO5:Yb3+ Phosphors. J. Electron. Mater. 47, 6567–6574 (2018). https://doi.org/10.1007/s11664-018-6570-5

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  • DOI: https://doi.org/10.1007/s11664-018-6570-5

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