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- W2898878054 abstract "Abstract We have developed a new broadband‐sensitive photon upconversion (UC) material that can be used for transparent ceramic plates mounted on the rear faces of crystalline silicon solar cells. We selected the host material of a cubic crystal structure codoped with Er 3+ and Ni 2+ so that the Ni 2+ dopants were fully activated to sensitize the Er 3+ emitters. In garnet‐type Ca 3 Ga 2 Ge 3 O 12 with additional codopants of Nb 5+ and Li + for charge compensation, all the Ni 2+ dopants occupied the six‐coordinated Ga 3+ sites, leading to highly efficient energy transfer from the Ni 2+ to the Er 3+ . Formation of four‐coordinated Ni 2+ that quenches the UC emission of the Er 3+ was prevented, because Ni 2+ cannot substitute the four‐coordinated Ge 4+ much smaller than Ni 2+ . Consequently, energy dissipation from the Er 3+ to the Ni 2+ was well reduced compared with the previously developed Gd 3 Ga 5 O 12 :Er,Ni,Nb in which the Ni 2+ dopants partially occupied the four‐coordinated Ga 3+ sites. Additional introduction of Y 3+ and Li + enhanced optical transitions and improved the UC performance, owing to more enhanced lattice distortion, along with eliminating different phases. The optimal composition (Ca 0.6 Er 0.1 Y 0.1 Li 0.2 ) 3 (Ga 0.98 Ni 0.01 Nb 0.01 ) 2 Ge 3 O 12 exhibited a broadband sensitivity ranging from 1.1 μm (the absorption edge of silicon) to 1.6 μm for the UC emission at 0.98 μm." @default.
- W2898878054 created "2018-11-09" @default.
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- W2898878054 date "2018-11-21" @default.
- W2898878054 modified "2023-10-16" @default.
- W2898878054 title "A broadband‐sensitive upconverter: Garnet‐type Ca <sub>3</sub> Ga <sub>2</sub> Ge <sub>3</sub> O <sub>12</sub> codoped with Er <sup>3+</sup> , Y <sup>3+</sup> , Li <sup>+</sup> , Ni <sup>2+</sup> , and Nb <sup>5+</sup>" @default.
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- W2898878054 doi "https://doi.org/10.1111/jace.16193" @default.
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