Figure | Luminescence properties of MgO:Ni2+,Cr3+ translucent ceramics. (IMAGE)
Caption
Figure | Luminescence properties of MgO:Ni2+,Cr3+ translucent ceramics. a PLE and PL spectra of MgO:0.3%Ni2+,0.3%Cr3+, MgO:0.3%Ni2+, and MgO:0.3%Cr3+ ceramics. b Energy level diagram of Cr3+/Ni2+ in MgO:0.3%Ni2+,0.3%Cr3+ ceramic and the mechanism of energy transfer from Cr3+ to Ni2+. c Comparison of NIR-II PL spectra of Ni2+ in octahedron cation site with different distortion degrees in MgO:0.3%Ni2+ and MgO:0.3%Ni2+,0.3%Cr3+ ceramics. d The distortion of [NiO6] octahedron in MgO:Ni2+ and MgO:Ni2+,Cr3+ with different Ni2+-Cr3+ distances. Insets show local structure of [NiO6] octahedron in MgO:Ni2+ and MgO:Ni2+,Cr3+ with Ni2+-Cr3+ distances of 3.03, 4.28, 5.21, 6.01 and 6.72 Å, respectively. e Contributions of the O-2p and Ni-3d orbitals to the highest occupied 3d Kohn-Sham orbitals as a function of Ni2+-Cr3+ separation (3.03, 4.28, 5.21, 6.01 and 6.72 Å). f Band-decomposed charge density profiles for a single Ni2+ dopant (left) and Ni2+-Cr3+ dopants separated by 4.28 Å (right). These profiles represent the Ni2+ 3d8 Kohn-Sham orbitals within the (0 6 0) Miller plane, with a saturation scale from 0.0001 (blue) to 0.002 (red) and linear contour intervals from 0.01 to 0.3, in units of a-3 0, where a0 is the Bohr radius . g Absorption (dash-dot line), IQE(red column) and EQE (blue column) of MgO:x%Ni2+,0.3%Cr3+ (x = 0.1-0.7) ceramics and MgO:0.3%Ni2+,0.3%Cr3+ phosphor. h The trend of integrated emission intensities of MgO:0.3%Ni2+,0.3%Cr3+ ceramic and phosphor dependent on temperatures. i Comparison on EQE values of MgO:0.3%Ni2+,0.3%Cr3+ ceramic and previously reported NIR-II emissive Ni2+-activated phosphors.
Credit
Simin Gu et al.
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