The optical spectroscopy of Ni-doped garnets

Dubrovina, É. P.; Sandulenko, V. A.; Demchuk, M. I.; Кулешов, Н. В.; Mikhailov, V. P.

doi:10.1016/s0009-2614(90)87087-8

Cited by 26 publications

(6 citation statements)

References 5 publications

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“…For the Ni only doped (no Er) sample, broad emission band ranging from 1300 nm to 1600 nm originated from the 3 T 2 ( 3 F) / 3 A 2 ( 3 F) transition of Ni 2+ was observed. [26][27][28][29][30][31][32][33] However, by introducing Er 3+ (Li + ) co-dopants, the Ni 2+ emission almost disappeared and Er 3+ emissions at around 1550 nm ( 4 I 13/2 / 4 I 15/2 ) and 980 nm ( 4 I 11/2 / 4 I 15/2 ) appeared (see Fig. S5 † for 1180 nm excited UC at 980 nm).…”

Section: Resultsmentioning

confidence: 99%

“…[24][25][26][27][28][29][30][31] It has been demonstrated that six coordinated Ni 2+ ions located at the centers of octahedrons have substantial absorption around 1100-1400 nm that can further be tuned in a wide range by manipulating the crystal eld strength around the Ni 2+ ions. 26,30,32 Accordingly, its NIR emission band is also wide ranging from 1200 nm to longer than 1700 nm with extremely high quantum yield reaching unity in some crystals such as LiGa 5 O 8 .…”

Section: Materials Designmentioning

confidence: 99%

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Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

et al. 2016

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We have developed Ni 2+ , Er 3+ codoped CaZrO 3 broadband-sensitive upconverters that significantly broaden the sensitive range, and hence overcome the shortcomings of conventional Er 3+ doped upconverters used for crystalline silicon (c-Si) solar cells that utilize only a small fraction of the solar spectrum around 1550 nm. We have designed the combination of sensitizers and host material to utilize photons that are not absorbed by c-Si itself or Er 3+ ions. Six coordinated Ni 2+ ions substituted at the Zr 4+ sites absorb (1060-1450) nm photons and transfer the energies to the Er 3+ ions, and the Er 3+ upconverts at 980 nm. Co-doping with monovalent charge compensators such as Li + for high Er 3+ solubilisation at the Ca 2+ sites and multivalent ions (Nb 5+ ) for stabilization of Ni 2+ at the Zr 4+ sites is essential. In addition to 1450-1600 nm (z2 Â 10 20 m À2 s À1 ) photons directly absorbed by the Er 3+ ions, we have demonstrated upconversion of 1060-1450 nm (z6 Â 10 20 m À2 s À1 ) photons in the Ni 2+ absorption band to 980 nm photons using the CaZrO 3 :Ni 2+ ,Er 3+ upconverters. Compared with the current density gain of present c-Si solar cells ($40 mA cm À2 ), the upconverted photons could increase this by $7.3 mA cm À2 , which is about 18% improvement. This architecture for broadband-sensitive upconversion may pave a new direction for the improvement in efficiency of the present c-Si solar cells to surpass the limiting conversion efficiency of single-junction solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: Materials Designmentioning

confidence: 99%

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

et al. 2016

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“…With [4] as promising materials for solid-state lasers. In this paper we present detailed analysis of the absorption spectra of CaSGG:Ni 2+ based on the recently developed discrete variational multi-electron (DV-ME) method [5].…”

Section: +mentioning

confidence: 99%

Fully relativistic analysis of the absorption spectra of Ca₃Sc₂Ge₃O₁₂:Ni²⁺

Brik¹,

Ogasawara

2006

Physica Status Solidi (b)

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Systematic analysis of the energy level schemes, ground state absorption (GSA) and covalency effects for the Ni 2+ ion in Ca 3 Sc 2 Ge 3 O 12 was performed. The recently developed first-principles approach to the analysis of the absorption spectra of impurity ions in crystals based on the discrete variational multi-electron method (DV-ME) [K. Ogasawara et al., Phys. Rev. B 64, 115413 (2001)] was used in the calculations. As a result, complete energy level schemes of Ni 2+ and its absorption spectra at both possible crystallographic positions (distorted octahedral Sc 3+ and tetrahedral Ge 4+ positions) were calculated, assigned and compared with experimental data. Energies of the charge transfer (CT) transitions for both positions are estimated. Numerical contributions of all possible electron configurations into the calculated energy states were determined. By performing analysis of the molecular orbitals (MO) population, it was shown that the covalency of the chemical bonds between the Ni 2+ and O 2-ions increases in passing from the hexa-to the tetra-coordinated complex.

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“…With this aim in view, Y 3 Al 5 O 12 :Ni 2+ and Gd 3 Sc 2 Ga 3 O 12 :Ni 2+ , for example, have been proposed in Ref. [4] as promising materials for solid-state lasers.…”

Section: Introductionmentioning

confidence: 99%

First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

Brik

2007

Journal of Luminescence

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The optical spectroscopy of Ni-doped garnets

Cited by 26 publications

References 5 publications

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Fully relativistic analysis of the absorption spectra of Ca₃Sc₂Ge₃O₁₂:Ni²⁺

First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

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The optical spectroscopy of Ni-doped garnets

Cited by 26 publications

References 5 publications

Broadband-sensitive Ni2+–Er3+ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni2+–Er3+ based upconverters for crystalline silicon solar cells

Fully relativistic analysis of the absorption spectra of Ca3Sc2Ge3O12:Ni2+

First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

Contact Info

Product

Resources

About

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Broadband-sensitive Ni²⁺–Er³⁺ based upconverters for crystalline silicon solar cells

Fully relativistic analysis of the absorption spectra of Ca₃Sc₂Ge₃O₁₂:Ni²⁺