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Enhanced near-infrared persistent luminescence in MgGa2O4:Cr3+ through codoping

Journal Contribution - Journal Article

Near-infrared emitting persistent luminescent materials have potential applications in night-vision surveillance and medical imaging. Rational designing of the phosphor composition is of great importance for achieving sufficiently strong and long-lasting persistent luminescence. Herein, a series of MgGa2O4:Cr3+ phosphors with variable concentrations of Cr3+ were prepared via solid state reaction. MgGa2O4:Cr3+ exhibits strong emission in the range from 650 to 800 nm and three excitation bands centered at 275, 420 and 576 nm. With appropriate selection of codopant M (M = Al3+, Si4+, Ge(4+ )or Sn4+), the MgGa2O4:Cr3+, M phosphor presents remarkably enhanced persistent luminescence. Moreover, the trap distributions were tuned and the number of traps was greatly increased via codoping. In particular, MgGa2O4:Cr3+, Si4+ shows more than 7 h of persistent nearinfrared light emission before the intensity drops to 5 x 10(-4) mWsr(-1) m(-2). Codoping with appropriate ions provides a good example in optimization and development of persistent luminescent phosphors for potential bioimaging applications.
Journal: JOURNAL OF LUMINESCENCE
ISSN: 1872-7883
Volume: 220
Publication year:2020
Accessibility:Closed