@article{01K2YVJB16GEG6ZKWPZD58CFX7,
  abstract     = {{Near-infrared (NIR) luminescent materials play a vital role in photonic, optoelectronic, and biological applications. In this work, MgTa2O6: 1 mol% Cr3+ samples doped with different Al3+ concentrations were synthesized by a solid-state chemical reaction at 800 degrees C for 8 h after ball-milling the mixed precursors. X-ray diffraction (XRD) was used to confirm that the sample crystallized into a single phase, without impurities. Scanning electron microscopy (SEM), was used to confirm the morphology, which consists of irregular particles, and energy dispersive spectroscopy (EDS) confirmed the presence of Mg, Ta, O, Cr, as well as Al. Incorporating Cr3+ and Al3+ into the host reduced the optical energy band gap of the material from 4.34 to 4.31 eV. The results showed that adding Al3+ can improve the photon absorption of the Al3+ co-doped MgTa2O6: 1mo% Cr3+, enhancing its emission intensity. The photoluminescence (PL) spectra displayed a broad emission between 700 and 900 nm, with a barycentre at 850 nm, when the samples were excited at 280 nm. The emission originates from the spin-allowed transition, 4T2-4A2, of Cr3+ ions.Additionally, the decay curve was recorded, and the extracted time parameter corresponding to the luminescence was 29.79 f 0.11 mu s. The presence of electron trapping centres was confirmed using thermoluminescence (TL) spectroscopy. The depths of the electron trapping centres were approximated to be 0.69 f 0.05, 0.77 f 0.04, and 1.21 f 0.04 eV, respectively. Finally, density functional theory (DFT) was applied to understand the electronic and optical properties with pronounced effects attributed to the presence of the Cr3+ ions. The study suggests that Al3+ doping MgTa2O6: 1 mol% Cr3+ has potential applications in solid-state lighting, safety illumination, and possible future development of PersL applications, etc.}},
  articleno    = {{121416}},
  author       = {{Mlotswa, D. V. and Yagoub, M. Y. A. and Poelman, Dirk and Orante-Barron, V. R. and Mofokeng, S. J. and Swart, H. C. and Obodo, K. O. and Noto, L. L.}},
  issn         = {{0022-2313}},
  journal      = {{JOURNAL OF LUMINESCENCE}},
  keywords     = {{luminescence,persistent luminescence,Photoluminescence,Thermoluminescence,Electron trapping centres,Al,Luminescent material,THERMOLUMINESCENCE,EMISSION,PHOTOLUMINESCENCE}},
  language     = {{eng}},
  pages        = {{10}},
  title        = {{Effects of Cr3+and Al3+co-doping on the spontaneous and stimulated luminescence of MgTa2O6}},
  url          = {{http://doi.org/10.1016/j.jlumin.2025.121416}},
  volume       = {{286}},
  year         = {{2025}},
}

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