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Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs.

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Title: Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs.
Authors: Gao, Huanzhuo1 (AUTHOR), Devakumar, Balaji2 (AUTHOR), Huang, Xiaoyong1 (AUTHOR) huangxy04@126.com
Source: Ceramics International. Mar2025, Vol. 51 Issue 7, p8321-8328. 8p.
Subjects: Transition metal ions, Dipole-dipole interactions, Quantum efficiency, Band gaps, Interior lighting
Abstract: Transition metal Cr3+ ions doped near-infrared (NIR) emitting phosphors have bright application prospects in plant growth LEDs. Herein, we report on the synthesis, crystal structure, morphology, luminescence properties and thermal stability of Cr3+ doped Ca 2 AlNbO 6 NIR-emitting double-perovskite phosphors. The Ca 2 AlNbO 6 host belongs to the monoclinic system, and its band gap is determined to be 4.02 eV. In Ca 2 AlNbO 6 :Cr3+ phosphors, the Cr3+ ion replaces the Al3+ site of the distorted octahedron and it experiences a strong crystal field environment with D q / B value of 2.7. Upon 337 nm excitation, the optimal Ca 2 AlNbO 6 :0.2%Cr3+ phosphor produces a narrow NIR band peaking at 744 nm corresponding to the 2E g → 4A 2g transition of Cr3+ ion, and its internal quantum efficiency reaches 32.6%. There is a large spectral overlap between the emission spectrum of Ca 2 AlNbO 6 :0.2%Cr3+ phosphor and the absorption spectrum of phytochrome P FR , so Ca 2 AlNbO 6 :Cr3+ phosphor can be used for indoor plant lighting. The concentration quenching mechanism is found to be dipole-dipole interaction. Additionally, the decay lifetimes of Ca 2 AlNbO 6 :Cr3+ phosphors are located within the range of from 2.117 to 3.245 ms. Furthermore, the thermal stability of Ca 2 AlNbO 6 :0.2%Cr3+ is studied through temperature-dependent emission spectra, and its integrated emission intensity at 423 K is 54% of that at 303 K. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs.
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  Data: <searchLink fieldCode="AR" term="%22Gao%2C+Huanzhuo%22">Gao, Huanzhuo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Devakumar%2C+Balaji%22">Devakumar, Balaji</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Huang%2C+Xiaoyong%22">Huang, Xiaoyong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> huangxy04@126.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. Mar2025, Vol. 51 Issue 7, p8321-8328. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Transition+metal+ions%22">Transition metal ions</searchLink><br /><searchLink fieldCode="DE" term="%22Dipole-dipole+interactions%22">Dipole-dipole interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+efficiency%22">Quantum efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Interior+lighting%22">Interior lighting</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Transition metal Cr3+ ions doped near-infrared (NIR) emitting phosphors have bright application prospects in plant growth LEDs. Herein, we report on the synthesis, crystal structure, morphology, luminescence properties and thermal stability of Cr3+ doped Ca 2 AlNbO 6 NIR-emitting double-perovskite phosphors. The Ca 2 AlNbO 6 host belongs to the monoclinic system, and its band gap is determined to be 4.02 eV. In Ca 2 AlNbO 6 :Cr3+ phosphors, the Cr3+ ion replaces the Al3+ site of the distorted octahedron and it experiences a strong crystal field environment with D q / B value of 2.7. Upon 337 nm excitation, the optimal Ca 2 AlNbO 6 :0.2%Cr3+ phosphor produces a narrow NIR band peaking at 744 nm corresponding to the 2E g → 4A 2g transition of Cr3+ ion, and its internal quantum efficiency reaches 32.6%. There is a large spectral overlap between the emission spectrum of Ca 2 AlNbO 6 :0.2%Cr3+ phosphor and the absorption spectrum of phytochrome P FR , so Ca 2 AlNbO 6 :Cr3+ phosphor can be used for indoor plant lighting. The concentration quenching mechanism is found to be dipole-dipole interaction. Additionally, the decay lifetimes of Ca 2 AlNbO 6 :Cr3+ phosphors are located within the range of from 2.117 to 3.245 ms. Furthermore, the thermal stability of Ca 2 AlNbO 6 :0.2%Cr3+ is studied through temperature-dependent emission spectra, and its integrated emission intensity at 423 K is 54% of that at 303 K. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ceramint.2024.12.261
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        Text: English
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        PageCount: 8
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        Type: general
      – SubjectFull: Dipole-dipole interactions
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      – SubjectFull: Quantum efficiency
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      – SubjectFull: Band gaps
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      – TitleFull: Near-infrared emitting Ca2AlNbO6:Cr3+ double-perovskite phosphors for plant growth LEDs.
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            NameFull: Gao, Huanzhuo
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            NameFull: Devakumar, Balaji
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              M: 03
              Text: Mar2025
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              Y: 2025
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