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Tuning from green to red the upconversion emission of Y2O3:Er3+–Yb3+ nanophosphors

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Abstract

In this work, the structural, morphological and luminescent properties of Y2O3 nanophosphors doped with Er3+ (1 mol%) and different Yb3+ concentrations (2–12 mol%) have been studied. Those nanophosphors were synthesized using a simple hydrothermal method. XRD analysis indicates that all the samples presented a pure cubic phase even for Yb concentrations as high as 12 mol%. In addition, SEM images show nanoparticles with quasi-spherical shapes with average sizes in the range of 300–340 nm. Photoluminescence measurements obtained after excitation at 967 nm revealed that our samples have strong green (563 nm) and red emissions (660 nm) corresponding to 2H11/2 + 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+ ions, respectively. We also observed that the green band is quenched and the red emission enhanced as the Yb concentration increases. In consequence, the CIE coordinates changed from (0.35, 0.64) in the green region to (0.59, 0.39) in the red region. Thus, the tuning properties of Y2O3 nanophosphors suggest that they are good candidates for applications in lighting.

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Acknowledgements

E. Resendiz-L thanks to CONACyT for its support through a scholarship Grant 232056 for Ph.D. studies at Centro de Fisica Aplicada y Tecnologia Avanzada. Dr. Salas acknowledges the financial support of DGAPA-UNAM for sabbatical leave in the Universidad Autonoma de Madrid, España.

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Authors and Affiliations

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

    L. A. Diaz-Torres

  2. Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Apartado Postal 1-1010, Querétaro, QRO, Mexico

    P. Salas, E. Resendiz-L & C. Rodriguez-Gonzalez

  3. Conacyt-Facultad Ciencias Quimicas Universidad Autonoma de Coahuila, 25000, Saltillo, Coahuila, Mexico

    J. Oliva

  4. Instituto de Física, Benemerita Universidad Autonoma de Puebla, A.P. J-48, 72570, Centro Histórico, PUE, Mexico

    O. Meza

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  1. L. A. Diaz-Torres
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  2. P. Salas
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  3. J. Oliva
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  4. E. Resendiz-L
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  5. C. Rodriguez-Gonzalez
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Correspondence to P. Salas.

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Diaz-Torres, L.A., Salas, P., Oliva, J. et al. Tuning from green to red the upconversion emission of Y2O3:Er3+–Yb3+ nanophosphors. Appl. Phys. A 123, 25 (2017). https://doi.org/10.1007/s00339-016-0668-5

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  • DOI: https://doi.org/10.1007/s00339-016-0668-5

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