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Optical energy storage properties of Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials

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Abstract

The details of the mechanism of persistent luminescence were probed by investigating the trap level structure of Sr2MgSi2O7:Eu2+,R3+ materials (R: Y, La-Lu, excluding Pm and Eu) with thermoluminescence (TL) measurements and Density Functional Theory (DFT) calculations. The TL results indicated that the shallowest traps for each Sr2MgSi2O7:Eu2+,R3+ material above room temperature were always ca. 0.7 eV corresponding to a strong TL maximum at ca. 90 °C. This main trap energy was only slightly modified by the different co-dopants, which, in contrast, had a significant effect on the depths of the deeper traps. The combined results of the trap level energies obtained from the experimental data and DFT calculations suggest that the main trap responsible for the persistent luminescence of the Sr2MgSi2O7:Eu2+,R3+ materials is created by charge compensation lattice defects, identified tentatively as oxygen vacancies, induced by the R3+ co-dopants.

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Acknowledgements

Financial support is acknowledged from the Turku University Foundation, Jenny and Antti Wihuri Foundation (Finland) and the Academy of Finland (contracts #117057/2000, #123976/2006, and #134459/2009). The DFT calculations were carried out using the supercomputing resources of the CSC IT Center for Science (Espoo, Finland). The study was supported by the research mobility agreements (112816/2006/JH and 116142/2006/JH, 123976/2007/TL) between the Academy of Finland and the Academy of Sciences of the Czech Republic, as well as the Czech research project AVOZ10100521.

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Author notes

  1. Janne Niittykoski

    Present address: OMG Kokkola Chemicals Oy, P.O. Box 286, 67101, Kokkola, Finland

Authors and Affiliations

  1. Departamento de Química Fundamental, Universidade de São Paulo, Instituto de Química, Av. Prof. Lineu Prestes, 748, São Paulo, SP, CEP 05508-900, Brazil

    Hermi F. Brito, Jorma Hölsä & Lucas C. V. Rodrigues

  2. Department of Chemistry, University of Turku, 20014, Turku, Finland

    Jukka Hassinen, Jorma Hölsä, Taneli Laamanen, Mika Lastusaari, Marja Malkamäki, Janne Niittykoski & Lucas C. V. Rodrigues

  3. Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland

    Jorma Hölsä & Mika Lastusaari

  4. Dating Laboratory, University of Helsinki, 00014, Helsinki, Finland

    Högne Jungner

  5. Graduate School of Materials Research (GSMR), Turku, Finland

    Taneli Laamanen & Marja Malkamäki

  6. Institute of Physics, Academy of Sciences of the Czech Republic, 16253, Prague 6, Czech Republic

    Pavel Novák

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  1. Hermi F. Brito
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Correspondence to Mika Lastusaari.

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Brito, H.F., Hassinen, J., Hölsä, J. et al. Optical energy storage properties of Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials. J Therm Anal Calorim 105, 657–662 (2011). https://doi.org/10.1007/s10973-011-1403-2

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  • DOI: https://doi.org/10.1007/s10973-011-1403-2

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