Issue 34, 2024

Achieving spectrally tunable and thermally stable near-infrared emission in Fe3+-activated spinel phosphors via the cation site modulation strategy

Abstract

Environment-friendly Fe3+ ions as near-infrared (NIR) activators have recently attracted considerable interest in intelligent NIR light source field; however, designing wavelength-tunable and thermally stable Fe3+-doped NIR luminescence material remains a daunting challenge. Here, by selecting a spinel compound as the host, a series of Mg1−yAl2+yO4:Fe3+ NIR phosphors featuring tunable wavelengths and high thermal stability is developed using a cation site modulation strategy. Through Mg2+/Al3+ chemical substitution to modify the local crystal environment and the site occupation of Fe3+, the emission peak can be adjusted from 730 to 770 nm along with a greatly enhanced emission intensity. The emission redshift and intensity increase mechanism of the as-prepared phosphors is revealed by structural analyses. The emission intensity of Mg0.87Al2.13O4:Fe3+ at 423 K can maintain 85.13% of the initial intensity at room temperature. The synergistic effect of weak electron–phonon coupling effect, high structural rigidity, and large bandgap renders excellent anti-quenching properties to the developed phosphors. Additionally, the as-prepared phosphors demonstrated great potential in the non-destructive detection and quantitative analysis of Cu2+ contents. This work provides a new design principle toward the optical property optimization of Fe3+-activated NIR materials for multiple photonic applications.

Graphical abstract: Achieving spectrally tunable and thermally stable near-infrared emission in Fe3+-activated spinel phosphors via the cation site modulation strategy

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Article information

Article type
Paper
Submitted
30 Jun 2024
Accepted
15 Jul 2024
First published
18 Jul 2024

J. Mater. Chem. C, 2024,12, 13268-13278

Achieving spectrally tunable and thermally stable near-infrared emission in Fe3+-activated spinel phosphors via the cation site modulation strategy

Z. Zhou, H. Jiang, J. Wei, Z. Fei, B. Yin, J. Qiu, Z. Yang and G. Dong, J. Mater. Chem. C, 2024, 12, 13268 DOI: 10.1039/D4TC02763A

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