Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 34, 2017
Previous Article Next Article

The role of Ln3+ (Ln = Eu, Yb) in persistent red luminescence in MgGeO3:Mn2+

Author affiliations

Abstract

In this paper, Mn2+ and Ln3+ (Ln = Eu, Yb) co-doped MgGeO3 phosphors were prepared using a solid state reaction technique, and their optical properties were investigated. Mn2+-doped samples exhibit persistent luminescence in the red region, peaking at 677 nm, because of the 4T16A1 transition of the Mn2+ ions under ultraviolet (UV) excitation. Based on the charge transfer (CT) transition of Eu3+ and the band-gap energy, energy level diagrams with divalent lanthanide ground states relative to the conduction and valence band edges were constructed. ΔE(Ln), (Ln = Eu, Yb), which represents the energy gaps between the divalent lanthanide ground states and the bottom of the conduction band, were found to be 0.95 and 0.52 eV, respectively. Compared to a Mn2+ singly-doped sample, the thermoluminescence (TL) glow curves of the Mn2+–Eu3+ co-doped sample and the Mn2+–Yb3+ co-doped sample showed an additional TL glow peak at approximately 502 and 332 K with trap depths (Etrap) of 1.49 and 0.99 eV, respectively. The correspondence of Etrap with ΔE(Ln) suggests that Eu3+ and Yb3+ themselves work as electron traps in the MgGeO3:Mn2+ phosphors. We have also demonstrated that the Mn2+–Eu3+ co-doped material could be a good probe with photo-stimulated functions for long-term in vivo imaging owing to its deeper trap depth.

Graphical abstract: The role of Ln3+ (Ln = Eu, Yb) in persistent red luminescence in MgGeO3:Mn2+

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Jul 2017, accepted on 03 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC03151C
Citation: J. Mater. Chem. C, 2017,5, 8893-8900

  •   Request permissions

    The role of Ln3+ (Ln = Eu, Yb) in persistent red luminescence in MgGeO3:Mn2+

    Y. Katayama, T. Kayumi, J. Ueda, P. Dorenbos, B. Viana and S. Tanabe, J. Mater. Chem. C, 2017, 5, 8893
    DOI: 10.1039/C7TC03151C

Search articles by author

Spotlight

Advertisements