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

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Bibliographic Details
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]
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Database: Engineering Source
Description
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]
ISSN:02728842
DOI:10.1016/j.ceramint.2024.12.261