Highly efficient broadband near-infrared luminescence in Ni2+-doped glass ceramics films containing cordierite nanocrystals

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni2+-doped β-Ga2O3 nanocrystals via mediated phase-controlled synthesis

“…Moreover, Fig.12 illustrates the corresponding decay curve of the 1% and 3% Ni 2+ -doped β-Ga 2 O 3 nanostructures. As noted before, crystal environment around Ni 2+ ions has a great effect on optical properties of Ni 2+ ions for their electrons in outer d orbit will have a strong interactation with β-Ga 2 O 3 host lattice, and thus the crystal field strength is recognized as a direct factor to influence optical properties in the Ni 2+ -doped β-Ga 2 O 3 nanocrystals [56] . Based on the results above, the near-infrared emission intensity and corresponding lifetime diminish with the increase of Ni 2+ -doped concentration, which may be also due to the crystal field of β-Ga 2 O 3 becomes weaker as suggested in the result of absorption spectra.…”

“…As noted before, the crystal environment around Ni 2+ ions has a great effect on the optical properties of Ni 2+ ions as their electrons in the outer d orbit will have a strong interaction with the b-Ga 2 O 3 host lattice, and thus the crystal field strength is recognized as a direct factor to influence the optical properties in the Ni 2+ -doped b-Ga 2 O 3 nanocrystals. 56 On the basis of the XRD, absorption spectra and PL spectra results above, it can be deduced that both the crystallinity and crystal field of b-Ga 2 O 3 would decrease with the increase of Ni 2+ dopants concentration.…”

Broadband NIR photoluminescence from Ni2+-doped nanocrystalline Ba–Al titanate glass ceramics

“…Consequently, the spectroscopic properties of Ni 2+ doped glasses, glass ceramics and single crystals have attracted much attention over the last decade. [3][4][5][6][7][8][9][10][11][13][14][15] As mentioned before, the coordination state in which Ni 2+ is incorporated into the host lattice is one of the key factors for achieving specific spectroscopic properties. The most frequently observed environments of Ni 2+ in solid matrices are tetrahedral (fourfold coordination, IV Ni 2+ ), trigonal bipyramidal (fivefold, V Ni 2+ ) and octahedral (sixfold, VI Ni 2+ ), respectively.…”