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Mn2+ and the trivalent europium (Eu3+)-doped MgGa2O4 ceramics are characterized using a multi-experimental approach. The formation of spinel-structured ceramics is ascertained from X-ray diffraction (XRD) analysis. Morphology investigations with transmission electron microscopy (TEM) show irregularly shaped grains and grain boundaries with a homogeneous distribution of Eu3+ ions. The inability of Eu activator to penetrate the bulk of ceramic grains is inferred from positron annihilation lifetime spectroscopy data. The Eu doping is shown to enhance the positron trapping rate due to the occupancy of vacancy-type defects at ceramic grains by Eu3+ ions. Both Mn2+ and Eu3+ doped samples show a broad multi-color luminescence in 350-650 nm range under 240 nm and 270-300 nm excitations. Blue emission is concluded to originate from host defects, whereas green emission and narrow lines in the red region of the spectrum are attributed to Mn2+ and Eu3+ ions, respectively. High asymmetry around Eu3+ ions can be concluded from the photoluminescence and positron annihilation lifetime spectra analysis.


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Microstructure and luminescent properties of Eu3+-activated MgGa2O4:Mn2+ ceramic phosphors

Show Author's information A. LUCHECHKOaY. SHPOTYUKa,bO. KRAVETSaО. ZAREMBAcK. SZMUCbJ. CEBULSKIbA. INGRAMdR. GOLOVCHAKeO. SHPOTYUKf,g( )
Department of Sensor and Semiconductor Electronics, Ivan Franko National University of Lviv, Lviv 79017, Ukraine
Institute of Physics, University of Rzeszow, Rzeszow 35959, Poland
Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Lviv 79005, Ukraine
Opole University of Technology, Opole 45370, Poland
Department of Physics, Engineering and Astronomy, Austin Peay State University, Clarksville, TN 37044, USA
Faculty of Science and Technology, Jan Dlugosz University, Czestochowa 42200, Poland
Vlokh Institute of Physical Optics, Lviv 79005, Ukraine

Abstract

Mn2+ and the trivalent europium (Eu3+)-doped MgGa2O4 ceramics are characterized using a multi-experimental approach. The formation of spinel-structured ceramics is ascertained from X-ray diffraction (XRD) analysis. Morphology investigations with transmission electron microscopy (TEM) show irregularly shaped grains and grain boundaries with a homogeneous distribution of Eu3+ ions. The inability of Eu activator to penetrate the bulk of ceramic grains is inferred from positron annihilation lifetime spectroscopy data. The Eu doping is shown to enhance the positron trapping rate due to the occupancy of vacancy-type defects at ceramic grains by Eu3+ ions. Both Mn2+ and Eu3+ doped samples show a broad multi-color luminescence in 350-650 nm range under 240 nm and 270-300 nm excitations. Blue emission is concluded to originate from host defects, whereas green emission and narrow lines in the red region of the spectrum are attributed to Mn2+ and Eu3+ ions, respectively. High asymmetry around Eu3+ ions can be concluded from the photoluminescence and positron annihilation lifetime spectra analysis.

Keywords:

spinel structure, magnesium gallate MgGa2O4, X-ray diffraction (XRD), positron annihilation, Mn2+ and Eu3+ luminescence
Received: 27 February 2020 Revised: 12 May 2020 Accepted: 18 May 2020 Published: 09 July 2020 Issue date: August 2020
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Publication history
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Publication history

Received: 27 February 2020
Revised: 12 May 2020
Accepted: 18 May 2020
Published: 09 July 2020
Issue date: August 2020

Copyright

© The Author(s) 2020

Acknowledgements

This study is supported by the Ministry of Education and Science of Ukraine under the Young Scientists Program (0117U007189). R. GOLOVCHAK acknowledges the U.S. National Science Foundation (Grant No. DMR-1725188) for the acquisition of PAL spectrometer. J. CEBULSKI acknowledges support from the SAIA for partial support of this research within the National Scholarship Program of the Slovak Republic.

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